biosystems PhD Lite Reference Manual

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Reference Manual

PhD Lite

Multi Gas Detector

651 South Main Street Middletown, CT 06457 USA (800) 711-6776 (860) 344-1079 Fax (860) 344-1068 http://www.biosystems.com Version 4.11 p/n 13-088 19APR2007

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THE PhD LITE PERSONAL PORTABLE GAS DETECTOR HAS BEEN DESIGNED FOR THE DETECTION OF DEFICIENCIES OF OXYGEN, ACCUMULATIONS OF FLAMMABLE GASES AND VAPORS AND ACCUMULATIONS OF TOXIC VAPORS.

IN ORDER TO ASSURE THAT THE USER IS PROPERLY WARNED OF POTENTIALLY DANGEROUS ATMOSPHERIC CONDITIONS, IT IS ESSENTIAL THA T THE INSTRUCTIONS IN THIS REFEREN CE MANUAL BE READ, FULLY UNDERSTOOD, AND FOLLOWED.

PhD Lite Reference Manual

Version 4.11

Biosystems

Middletown, Connecticut 06457

All rights re served .

No page or part of this operation manual may be reproduced in any form

without written permission of the copyright owner shown above.

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Table of Contents

Chapter 1. Description ---------------------------------------------------------------------------------------7

1.1 PhD Lite capabilities------------------------------------------------------------------------------------------------------------7

1.2 Methods of sampling-----------------------------------------------------------------------------------------------------------7

1.3 Multi-sensor capability---------------------------------------------------------------------------------------------------------7

1.4 Calibration -------------------------------------------------------------------------------------------------------------------- -----7

1.5 Alarm logic-------------------------------------------------------------------------------------------------------------------------7

1.5.1 Alarm latch -------------------------------------------------------------------------------------------------------------------------------7

1.5.2 Atmospheric hazard alarms-----------------------------------------------------------------------------------------------------------8

1.5.3 Sensor overrange alarms.-------------------------------------------------------------------------------------------------------------8

1.5.4 Low battery alarms----------------------------------------------------------------------------------------------------------------------8

1.5.5 Other alarms and special microprocessor features ------------------------------------------------------------------------------9

1.6 Other electronic safeguards -------------------------------------------------------------------------------------------------9

1.6.1 Security beep ----------------------------------------------------------------------------------------------------------------------------9

1.7 Classifi cation fo r intrinsic safety-------------------------------------------------------------------------------------------9

1.8 Sensors-----------------------------------------------------------------------------------------------------------------------------9

1.9 Continuous sample draw pump --------------------------------------------------------------------------------------------9

1.10 Black box data recorder ----------------------------------------------------------------------------------------------------9

1.11 Remote Vibrating Alarm----------------------------------------------------------------------------------------------------9

1.12 PhD Lite design components------------------------------------------------------------------------------------------- 10

1.13 PhD Lite standard accessories----------------------------------------------------------------------------------------- 10

1.13.1 Alkaline PhD Lite detectors ------------------------------------------------------------------------------------------------------ 10

1.13.2 NiMH PhD Lite detectors ---------------------------------------------------------------------------------------------------------10

1.14 PhD Lite kits------------------------------------------------------------------------------------------------------------------ 10

1.14.1 PhD Lite Confined Space Kits -------------------------------------------------------------------------------------------------- 10

1.14.2 PhD Lite Value Packs------------------------------------------------------------------------------------------------------------- 10

Chapter 2. Basic operation--------------------------------------------------------------------------------11

2.1 Operational warnings and cautions------------------------------------------------------------------------------------- 11

2.2 On and off sequences--------------------------------------------------------------------------------------------------------11

2.2.1 Start-up sequence -------------------------------------------------------------------------------------------------------------------- 11

2.2.1.1 Other start-up screens --------------------------------------------------------------------------------------------------------- 12

2.2.1.1.1 Non-standard alarms------------------------------------------------------------------------------------------------------- 12

2.2.1.1.2 “Warning Sensor Needs Cal”---------------------------------------------------------------------------------------------- 13

2.2.2 Shut-down sequence----------------------------------------------------------------------------------------------------------------- 13

2.3 Operating modes-------------------------------------------------------------------------------------------------------------- 13

2.3.1 Text Only mode------------------------------------------------------------------------------------------------------------------------13

2.3.2 Basic mode----------------------------------------------------------------------------------------------------------------------------- 14

2.3.3 Basic/Peak mode --------------------------------------------------------------------------------------------------------------------- 14

2.3.3.1 Peak readings-------------------------------------------------------------------------------------------------------------------- 14

2.3.3.2 To reset peak readings--------------------------------------------------------------------------------------------------------- 14

2.3.4 Technician mode---------------------------------------------------------------------------------------------------------------------- 14

2.3.4.1 STEL ------------------------------------------------------------------------------------------------------------------------------- 15

2.3.4.2 TWA readings--------------------------------------------------------------------------------------------------------------------15

2.3.4.3 Average readings----------------------------------------------------------------------------------------------------------------15

2.3.5 Changing operating modes ---------------------------------------------------------------------------------------------------------15

2.4 Batteries-------------------------------------------------------------------------------------------------------------------------- 16

2.4.1 Alkaline batteries---------------------------------------------------------------------------------------------------------------------- 16

2.4.1.1 Replacing alkaline batteries--------------------------------------------------------------------------------------------------- 16

2.4.2 NiMH rechargeable battery ---------------------------------------------------------------------------------------------------------16

2.4.2.1 Storage guidelines for the NiMH battery.----------------------------------------------------------------------------------- 16

2.4.2.2 Charging guidelines for NiMH battery--------------------------------------------------------------------------------------- 16

2.4.2.3 Charging procedure for NiMH battery--------------------------------------------------------------------------------------- 16

2.4.3 Low battery alarms--------------------------------------------------------------------------------------------------------------------17

2.5 Methods of sampling--------------------------------------------------------------------------------------------------------- 17

2.5.1 Using the hand-aspirated sample draw kit--------------------------------------------------------------------------------------- 17

2.5.2. Motorized sample draw pump ------------------------------------------------------------------------------------------------------18

2.5.2.1 Using the continuous sample draw pump---------------------------------------------------------------------------------- 18

2.5.2.2 Protective “low flow” shut-downs--------------------------------------------------------------------------------------------- 19

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2.5.2.3 Resuming diffusion monitoring ----------------------------------------------------------------------------------------------- 19

2.5.3 Sample probe assembly ------------------------------------------------------------------------------------------------------------- 19

2.5.3.1 Changing sample probe filters------------------------------------------------------------------------------------------------ 20

2.5.3.2 Changing sample probe tubes------------------------------------------------------------------------------------------------ 20

2.6 Biosystems EEPROM equipped “Smart Sensors” ----------------------------------------------------------------- 20

2.6.1 Identification of type of sensor by instrument -----------------------------------------------------------------------------------20

2.6.2 Other information stored with the sensor EEPROM ---------------------------------------------------------------------------20

2.6.3 Sensor removal and replacement -------------------------------------------------------------------------------------------------20

2.6.4 Missing sensor------------------------------------------------------------------------------------------------------------------------- 21

2.6.5 “Sensor not found”-------------------------------------------------------------------------------------------------------------------- 21

Chapter 3. Advanced Functions-------------------------------------------------------------------------22

3.1 The Main Menu ----------------------------------------------------------------------------------------------------------------- 22

3.1.1 Entering the Main Menu -------------------------------------------------------------------------------------------------------------22

3.2 The Alarm Menu----------------------------------------------------------------------------------------------------------------22

3.2.1 Entering the Alarm Menu------------------------------------------------------------------------------------------------------------ 22

3.2.2 Custom alarm settings ---------------------------------------------------------------------------------------------------------------22

3.2.3 Alarm and OK latches---------------------------------------------------------------------------------------------------------------- 23

3.2.3.1 Alarm latch settings------------------------------------------------------------------------------------------------------------- 23

3.2.3.2 OK latch settings ----------------------------------------------------------------------------------------------------------------23

3.2.4 Default alarm settings---------------------------------------------------------------------------------------------------------------- 24

3.2.4.1 Restore factory default alarm settings -------------------------------------------------------------------------------------- 24

3.2.5 Temperature alarm ------------------------------------------------------------------------------------------------------------------- 24

3.2.5.1 Enable/disable temperature alarms ----------------------------------------------------------------------------------------- 24

3.2.6 Warning alarms.----------------------------------------------------------------------------------------------------------------------- 25

3.2.6.1 Access warning alarm settings ----------------------------------------------------------------------------------------------- 25

3.2.6.2 Enable/disable warning alarms----------------------------------------------------------------------------------------------- 25

3.2.6.3 Adjust warning alarm levels --------------------------------------------------------------------------------------------------- 25

3.2.6.4 The warning alarm timeout function----------------------------------------------------------------------------------------- 25

3.2.6.4.1 Adjust timeout interval ------------------------------------------------------------------------------------------------------ 25

3.2.6.4.2 Disabling the timeout interval----------------------------------------------------------------------------------------------26

3.3 The Calibration Menu -------------------------------------------------------------------------------------------------------- 26

3.4 The Options Menu------------------------------------------------------------------------------------------------------------- 26

3.4.1 Entering the Options Menu---------------------------------------------------------------------------------------------------------- 26

3.4.2 User Modes ---------------------------------------------------------------------------------------------------------------------------- 26

3.4.2.1 Overview of user modes------------------------------------------------------------------------------------------------------- 26

3.4.2.2 Text Only Mode------------------------------------------------------------------------------------------------------------------26

3.4.2.3 Basic Mode----------------------------------------------------------------------------------------------------------------------- 27

3.4.2.4 Basic/Peak Mode----------------------------------------------------------------------------------------------------------------27

3.4.2.4.1 Peak readings ---------------------------------------------------------------------------------------------------------------- 27

3.4.2.5 Technician Mode---------------------------------------------------------------------------------------------------------------- 27

3.4.2.5.1 STEL--------------------------------------------------------------------------------------------------------------------------27

3.4.2.5.2 TWA readings ---------------------------------------------------------------------------------------------------------------- 27

3.4.2.5.3 Average readings------------------------------------------------------------------------------------------------------------ 28

3.4.2.6 Changing the user mode------------------------------------------------------------------------------------------------------- 28

3.4.3 Security beep -------------------------------------------------------------------------------------------------------------------------- 28

3.4.3.1 Adjusting the security beep----------------------------------------------------------------------------------------------------28

3.4.4 Passcode ------------------------------------------------------------------------------------------------------------------------------- 29

3.4.4.1 Enable/Disable passcode------------------------------------------------------------------------------------------------------ 29

3.4.4.2 Changing the passcode-------------------------------------------------------------------------------------------------------- 29

3.4.4.3 Span Lock------------------------------------------------------------------------------------------------------------------------- 29

3.4.5 Language ------------------------------------------------------------------------------------------------------------------------------- 30

3.4.5.1 Changing the readout language---------------------------------------------------------------------------------------------- 30

3.4.6 DECIMAL: Changing the precision of the toxic sensor readout ------------------------------------------------------------- 30

3.4.7 Temperature units: Changing the temperature scale-------------------------------------------------------------------------- 30

3.5 The Screen Menu-------------------------------------------------------------------------------------------------------------- 31

3.5.1 Entering the Screen Menu ----------------------------------------------------------------------------------------------------------31

3.5.2 Adjusting the contrast ---------------------------------------------------------------------------------------------------------------- 31

3.5.3 Adjusting the backlight --------------------------------------------------------------------------------------------------------------- 31

3.5.3.1 Backlight ON Always ----------------------------------------------------------------------------------------------------------- 31

3.5.3.2 Adjusting the backlight interval -----------------------------------------------------------------------------------------------32

3.5.4 Adjusting the screen orientation---------------------------------------------------------------------------------------------------- 32

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3.5.4.1 Flip Display ----------------------------------------------------------------------------------------------------------------------- 32

3.5.4.2 Invert text color ------------------------------------------------------------------------------------------------------------------ 32

3.6 The View Menu ----------------------------------------------------------------------------------------------------------------- 32

3.6.1 Entering the View Menu -------------------------------------------------------------------------------------------------------------33

3.6.2 View alarm levels --------------------------------------------------------------------------------------------------------------------- 33

3.6.3 View battery voltage------------------------------------------------------------------------------------------------------------------ 33

3.6.4 View service information------------------------------------------------------------------------------------------------------------- 33

3.6.5 View Software Version--------------------------------------------------------------------------------------------------------------- 33

3.7 The Time Menu----------------------------------------------------------------------------------------------------------------- 33

3.7.1 Entering the Time Menu ------------------------------------------------------------------------------------------------------------- 33

3.7.2 Time and date settings--------------------------------------------------------------------------------------------------------------- 34

3.7.3 Service date settings ----------------------------------------------------------------------------------------------------------------- 34

3.7.3.1 Enable/Disable sensor service due dates---------------------------------------------------------------------------------- 34

3.7.3.2 Change sensor service due date settings---------------------------------------------------------------------------------- 34

Chapter 4. Calibration--------------------------------------------------------------------------------------36

4.1 Verification of accuracy ----------------------------------------------------------------------------------------------------- 36

4.2 Effect of contaminants on PhD Lite sensors------------------------------------------------------------------------- 36

4.2.1 Effects of contaminants on oxygen sensors------------------------------------------------------------------------------------- 36

4.2.2 Effects of contaminants on combustible sensors------------------------------------------------------------------------------- 36

4.2.3 Effects of high concentrations of combustible gas on the combustible sensor------------------------------------------- 37

4.2.4 Effects of contaminants on toxic gas sensors----------------------------------------------------------------------------------- 37

4.3 Single sensors capable of monitoring for two different gases------------------------------------------------- 37

4.3.1 Using one sensor to monitor for Carbon Monoxide and Hydrogen Sulfide------------------------------------------------ 38

4.3.1.1 Biosystems Duo-Tox dual purpose Carbon Monoxide/Hydrogen Sulfide sensor ---------------------------------- 38

4.3.1.2 Biosystems “CO Plus” dual purpose carbon monoxide/hydrogen sulfide sensor ---------------------------------- 38

4.3.1.2.1 Relative response of the CO Plus sensor to carbon monoxide and hydrogen sulfide------------------------- 38

4.3.2 Cl

4.3.2.1 Cl2 Non-Specific ----------------------------------------------------------------------------------------------------------------- 38

4.3.2.2 ClO2 Non-Specific--------------------------------------------------------------------------------------------------------------- 38

and ClO

Non-Specific sensors------------------------------------------------------------------------------------------------ 38

4.4 Automatic calibration-------------------------------------------------------------------------------------------------------- 39

4.4.1 Automatic fresh air/zero calibration sequence ---------------------------------------------------------------------------------- 39

4.4.1.1 Reading “Too High” or “Too Low” for zero adjust------------------------------------------------------------------------- 39

4.4.2 Automatic span calibration sequence---------------------------------------------------------------------------------------------39

4.4.3 Automatic span calibration with more than one gas cylinder----------------------------------------------------------------- 40

4.5 Manual calibration-------------------------------------------------------------------------------------------------------------41

4.5.1 Manual fresh air calibration procedure-------------------------------------------------------------------------------------------- 41

4.5.1.1 Shortcuts to the manual fresh air calibration procedures --------------------------------------------------------------- 41

4.5.1.1.1 Shortcut to fresh air calibration while in normal operation----------------------------------------------------------- 41

4.5.1.1.2 Shortcut to Main Menu while turning the PhD Lite on---------------------------------------------------------------- 42

4.5.2 Manual span calibration procedures ----------------------------------------------------------------------------------------------42

4.6 Functional (bump) test-------------------------------------------------------------------------------------------------------42

4.7 The Calibration Menu -------------------------------------------------------------------------------------------------------- 43

4.7.1 Entering the Calibration Menu------------------------------------------------------------------------------------------------------ 43

4.7.2 Gas values -----------------------------------------------------------------------------------------------------------------------------43

4.7.2.1 Changing the combustible gas readout from LEL to CH4--------------------------------------------------------------- 43

4.7.2.2 Changing the direct reading setting of the CO Plus sensor from CO to H2S---------------------------------------- 44

4.7.3 Calibration reminder: ----------------------------------------------------------------------------------------------------------------- 45

4.7.3.1 Changing the calibration reminder------------------------------------------------------------------------------------------- 45

4.7.3.2 Disabling the calibration reminder ------------------------------------------------------------------------------------------- 46

4.7.4 Calibration history--------------------------------------------------------------------------------------------------------------------- 46

4.7.5 Last calibration------------------------------------------------------------------------------------------------------------------------- 47

4.7.6 IQ Link----------------------------------------------------------------------------------------------------------------------------------- 47

Chapter 5. Record Keeping-------------------------------------------------------------------------------48

5.1 Overview of record keeping options------------------------------------------------------------------------------------ 48

5.2 Black box data recorder----------------------------------------------------------------------------------------------------- 48

5.3 Datalogger upgrade-----------------------------------------------------------------------------------------------------------48

5.3.1 BioTrak database software---------------------------------------------------------------------------------------------------------- 48

5.3.2 IQ System ------------------------------------------------------------------------------------------------------------------------------49

5.4 Datalogger menu -------------------------------------------------------------------------------------------------------------- 49

5.4.1 Setting the datalogging interval ---------------------------------------------------------------------------------------------------- 49

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5.4.1.1 Enable/disable datalogger---------------------------------------------------------------------------------------------------- 50

5.4.2 Clearing the datalogger-------------------------------------------------------------------------------------------------------------- 50

5.4.3 Sessions -------------------------------------------------------------------------------------------------------------------------------- 51

5.4.4 Communications mode -------------------------------------------------------------------------------------------------------------- 51

5.4.5 ID information -------------------------------------------------------------------------------------------------------------------------- 51

5.4.5.1 User and location lists---------------------------------------------------------------------------------------------------------- 51

5.4.5.2 User and location ID’s---------------------------------------------------------------------------------------------------------- 52

5.4.5.3 Touch ID option------------------------------------------------------------------------------------------------------------------ 53

5.4.5.3.1 Touch ID menu--------------------------------------------------------------------------------------------------------------- 53

5.4.5.3.1.1 Location memory ------------------------------------------------------------------------------------------------------- 53

5.4.5.3.1.2 User ID memory -------------------------------------------------------------------------------------------------------- 53

5.4.5.3.1.3 Clear ID button---------------------------------------------------------------------------------------------------------- 54

Chapter 6. Basic maintenance---------------------------------------------------------------------------55

6.1 Sensors--------------------------------------------------------------------------------------------------------------------------- 55

6.1.1 Sensor replacement ------------------------------------------------------------------------------------------------------------------ 55

6.1.2 New sensor releases----------------------------------------------------------------------------------------------------------------- 56

6.1.3 Troubleshooting sensor problems ------------------------------------------------------------------------------------------------- 56

6.1.3.1 Can’t make automatic fresh air/zero calibration adjustment------------------------------------------------------------ 56

6.1.3.2 Can’t make span calibration adjustment.----------------------------------------------------------------------------------- 56

6.2 Motorized pump---------------------------------------------------------------------------------------------------------------- 56

6.2.1 Pump performance ------------------------------------------------------------------------------------------------------------------- 57

6.2.1.1 Verifying pump performance-------------------------------------------------------------------------------------------------- 57

6.2.1.2 Pump test failed ----------------------------------------------------------------------------------------------------------------- 57

6.2.1.3 Low flow pump failure ---------------------------------------------------------------------------------------------------------- 58

6.2.2 Internal pump filter replacement --------------------------------------------------------------------------------------------------- 58

6.2.3 Specific problems with motorized pump------------------------------------------------------------------------------------------ 58

6.2.3.1 Pump will not turn on -----------------------------------------------------------------------------------------------------------58

6.2.3.2 Can’t resume normal operation after a “Low Flow” shut down--------------------------------------------------------- 59

6.3 Sample probe assembly----------------------------------------------------------------------------------------------------- 59

6.3.1 Changing sample probe filters------------------------------------------------------------------------------------------------------ 59

6.3.2 Changing sample probe tubes ----------------------------------------------------------------------------------------------------- 59

6.4 Firmware upgrade from the Biosystems website------------------------------------------------------------------- 60

6.5. Returning your PhD Lite to Biosystems for service or repair------------------------------------------------ 60

6.6 Exploded view and parts list----------------------------------------------------------------------------------------------- 61

Appendices 62

Appendix A Toxic gas measurement - Ceilings, TWAs and STELs------------------------------------------------ 62

1. Ceiling level: ------------------------------------------------------------------------------------------------------------------------------ 62

2. Time Weighted Average (TWA):------------------------------------------------------------------------------------------------------ 62

3. Short Term Exposure Limits (STEL): ------------------------------------------------------------------------------------------------62

Appendix B PhD Lite sensor ranges ----------------------------------------------------------------------------------------- 63 Appendix C Sensor Cross-Sensitivity Chart------------------------------------------------------------------------------- 64 Appendix D Calibration Frequency------------------------------------------------------------------------------------------- 65 Appendix E Biosystems Standard Warranty Gas Detection Products -------------------------------------------- 66

The following signal words, as defined by ANSI Z535.4-1998, are used in the PhD Lite Reference Manual.

indicates an imminently hazardous situation which, if not avoided,

will result in death or serious injury.

indicates a potentially hazardous situation which, if not avoided,

could result in death or serious injury.

indicates a potentially hazardous situation, which if not avoided, may

result in moderat e or minor inju ry.

CAUTION used without the saf ety alert symbol indicates a pot entially hazardous

situation which, if not avoided, may result in property d amage.

Signal Words

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1. The PhD Lite personal, portable gas detector has been designed for the detection of dangerous atmospheric conditions. An alarm condition indicates the presence of a potentially life-threatening

hazard and should be taken very seriously.

2. safest course of action is to immediately leave the affected area, and to return only after further testing determines that the area is once again safe for entry. Failure to immediately leave the area may result in serious

injury or death.

3. Radio Shack 23-874 (not ATEX approved) size AA 1.5V Alkaline batteries, Eveready CH15 (not ATEX approved) or Radio Shack 23-149 (not ATEX approved) size AA 1.2V NiCad batteries, or Eveready L91 size AA 1.5V Lithium batteries (not CSA or ATEX approved). Substitution of batteries may impair intrinsic safety.

4. calibration gas. Failure to check accuracy can lead to inaccurate and potentially dangerous readings. (The

Canadian Standards Association (CSA) requires an accuracy check using known concentration calibration gas prior to each day’s use.)

5. to contaminants by testing with known concentration test gas before further use. Failure to check accuracy can

lead to inaccurate and potentially dangerous readings.

6. immediately. An instrument that fails calibration may not be used until testing with known concentration test gas

determines that accuracy has been restored, and the instrument is once again fit for use.

7. concentration that differs from the one that is normally supplied by Biosystems for use in calibrating the PhD Lite.

Customers are stro ngly urged to use only Biosyst ems calibration materials when calibrati ng t he PhD Lite. Use of non-standard calibration gas and/or calibration kit components can lead to dangerously inaccurate readings and may void the standard Biosystems warranty.

8. Use of non-standard calibration gas and/or calibration kit components when calibrating the PhD Lite can lead to inaccurate and potentially dangerous readings and may void the standard Biosystems

warranty. Biosystems offers calibration kits and long-lasting cylinders of test gas specifically developed for easy PhD Lite

calibrati on. Custome rs are str ongly urged to us e only Biosystems ca l ibratio n materials whe n calibrating t he PhD Lite.

10. only. Read and understand this reference manual before operating or servicing the PhD Lite.

11. combustible gas concentration that exceeds the PhD Lite’s zero to 100 percent LEL detection range.

12. U.S. & Canada: 54-26-0201, 54-26-0202, 54-26-0204 Europe: 54-26-0205, 54-26-0206, 54-26-0207

U.K.: 54-26-0208, 54-26-0209

13. 54-26-0101 (Standard), 54-26-0102 (Plated)

In the event of an alarm condition it is important to follow established procedures. The

Use only Duracell MN1500 or Ultra MX1500, Eveready Energizer E91-LR6,

The accuracy of the PhD Lite should be checked periodically with known concentration

The accuracy of the PhD Lite should be checked immediately following any known exposure

A sensor that cannot be calibrated or is found to be out of tolerance should be replaced

Do not reset the calibration gas concentration unless you are using a calibration gas

Substitution of components may impair intrinsic safety. For safety reasons this equipment must be operated and serviced by qualified personnel

A rapid up-scale reading followed by a declining or erratic reading may indicate a hazardous

Use only the following Biosystems chargers to recharge the PhD Lite:

Use only the following pumps with the PhD Lite:

Eveready EN91,

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Chapter 1. Description

1.1 PhD Lite capabilities

The PhD Lite gas detector can be configured to meet a wide variety of requirements. This chapter provides an overview of many of the features of the PhD Lite. More detailed descriptions are contained in the subsequent chapters of this manual.

1.2 Methods of sampling

The PhD Lite may be used in either diffusion or sampledraw mode. In either mode, the gas sample must reach the sensors for the instrument to register a gas reading. The sensors are located inside of the instrum ent.

In diffusion mode, the atmosphere being measured reaches the sensors by diffusing through vents in the sensor compartment cover. Normal air movements are enough to carry the sample to the sensors. The sensors react quickly to changes in the concentrations of the gases being measured. Diffusion-style operation monitors only the atmosphere that immediately surrounds the detector.

The PhD Lite can also be used to sample remote locations with either the hand-aspirated sample-draw kit that is included with every PhD Lite, or with a motorized continuous sample draw pump that is available separately. During remote sampling, the gas sample is drawn into the sensor compartment through the probe assembly and a length of tubing.

Use of the sample draw kits is covered in section

2.5.1.

A detailed description of the PhD Lite probe assembly is given in section 2.5.3.

1.3 Multi-sensor capability

The PhD Lite can be configured to simultaneously monitor oxygen, combustible gases and vapors and either one or two toxic gases. Sensors can be added, removed, changed, and replaced in the field. The PhD Lite microprocessor and “Smart Sensor” circuitry eliminates the need for laborious reconfiguration procedures.

Note: It is necessary to verify the accuracy of the PhD Lite by calibration with known concentration test gas whenever a change is made to the sensors installed in the instrument.

Calibration procedures are discussed in detail in Chapter 4.

The PhD Lite uses electrochemical toxic gas sensors that have been designed to minimize the effects of common interfering gases. These sensors provide accurate, dependable readings for toxic gases commonly encountered during confined space entry and other industrial applications. Toxic sensors currently available for use in the PhD Lite include hydrogen sulfide (H carbon monoxide (CO), sulfur dioxide (SO

), ammonia (NH3), chlorine (Cl2), chlorine dioxide

(PH

(ClO

), hydrogen cyanide (HCN), nitric oxide (NO) and

nitrogen dioxide (NO

), phosphine

S),

In addition to sensors designed to measure specific toxic hazards, Biosystems also offers two different sensors that allow for the simultaneous detection of both CO and

The “Duo-Tox” sensor is a dual channel electrochemical sensor designed to simultaneously detect both carbon monoxide and hydrogen sulfide. The Duo-Tox allows one sensor port to be used for the direct detection of both carbon monoxide and hydrogen sulfide.

For more information on the Duo-Tox sensor see section 4.3.1.1.

The “CO Plus” sensor is a single channel electrochemical sensor. The CO Plus is ideal for situations requiring the use of a single sensor to monitor for both Carbon Monoxide and Hydrogen Sulfide, but where the user

does not need to know specifically which gas is present.

For more information on the CO Plus sensor see section 4.3.1.2.

Different measurement units are used depending on the gas being measured.

Type of Hazar d Measurement unit Oxygen (O2) Percent age by volume Combustible gas Percentage of lower

explosive limit (%LEL)

All toxic sensors Parts per million (PPM)

Table 1.3. PhD Lite Standar d Units of M eas ur e me n t

Sensor configuration procedures are discussed in greater detail in Chapter 2.

1.4 Calibration

The PhD Lite detector features fully automatic fresh air and span calibration.

The accuracy of the PhD Lite should be checked periodically with known concentration calibration gas. Failure to check accuracy can lead to inaccurate and potentially dangerous readings. (The Canadian Standards Association (CSA) requires an accuracy check using known concentration calibration gas prior to each day’s use.)

Calibration procedures are discussed in detail in Chapter 4.

Use of these procedures is reserved for authorized personnel.

1.5 Alarm logic

PhD Lite gas alarms are user-adjustable and may be set anywhere within the range of the specific sensor type. When an alarm set point is exc eeded a loud audible alarm sounds, and the bright red LED alarm light flashes.

The procedure for adjusting alarm settings is covered in section 3.2.2.

1.5.1 Alarm latch

The PhD Lite includes a latching alarm feature that can be enabled or disabled according to the needs of the user. When the PhD Lite’s alarm latch is enabled, the

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audible and visible alarms will continue to sound even after the atmospheric hazard has cleared. To turn the alarm off, simply press the MODE button. If the PhD Lite’s alarm latch is disabled and the alarm condition is no longer present, the instrument will automatically return to normal operation, and the visible and audible alarms will cease without further input from the user.

The procedure for changing alarm and OK latch settings is covered in section 3.2.3.

1.5.2 Atmospheric hazard alarms The PhD Lite portable gas

detector has been designed for the detection of deficiencies of oxygen, accumulations of flammable gases and vapors, and accumulations of toxic vapors. An alarm condition indicating the presence of one or more of these potentially life-threatening hazards should be taken very seriously.

In the event of an alarm condition it is important to follow established procedures. The safest course of action is to immediately leave the affected area, and to return only after further testing determ i nes that th e area i s once a gain safe f or entry. Failure to immediately leave the area may result in serious injury or death.

A rapid up-scale reading followed by a declining or erratic reading may indicate a hazardous combustible gas concentration that exceeds the PhD Lite’s zero to 100 percent LEL detection range.

The combustible gas alarm is activated when the percent LEL (Lower Explosive Limit) gas concentration exceeds the pre-set alarm point.

Two oxygen alarm set points have been provided; one for low concentrations associated with oxygen deficiencies and one for high concentrations associated with oxygen enrichm ents.

Three alarm set points have been provided for each toxic gas that is monitored: TWA (Time Weighted Average), STEL (Short Term Exposure Limit), and Ceiling.

Appendix A discusses alarm levels and factory default alarm settings.

The procedure for adjusting alarm settings is covered in section 3.2.2.

1.5.3 Sensor overrange alarms.

The PhD Lite toxic gas channel will go into alarm if a sensor is exposed to a concentration of gas that exceeds its established range. If the peak alarm is enabled it will go off before an overrange alarm provided a STEL or TWA alarm is not activated first. If the peak alarm is disabled and a toxic sensor goes into overrange alarm a “SENSOR OUT OF RANGE” message will appear at the bottom of the display while the audible and visible are activated. The maximum range value will be displayed for the sensor in alarm. If the LEL sensor goes into overrange alarm, the message “LEL OVERRANGE” will intermittently appear, both the audible alarm and the flashing LED alarms will be

activated and an “X” will appear on the LCD in the place of the numeric reading for the LEL sensor.

In the event of an LEL overrange alarm the PhD Lite must be turned off, brought to an area that is known to be safe and then turned on again to reset the alarm.

Note: The PhD Lite features automatic warning against LEL sensor response failure due to lack of oxygen. When oxygen levels fall below 10% of gross volume, the PhD Lite will intermittently display a message indicating that O operate.

1.5.4 Low battery alarms

is too low for LEL to

Note: The voltage figures given below are for PhD Lite instruments with firmware version 3.18 and may be slig htly diff eren t for units wit h othe r vers ions of instrument firmware.

The PhD Lite includes low battery alarms that are activated whenever battery voltage approaches a level that will soon lead to instrument shut down. When the battery voltage is reduced to approximately 3.23 volts, an audible alarm will sound and the display will indicate that a low battery condition exists. At this stage, the low battery alarms may be silenced for a fifteen-minute period by pressing the MODE button. After the first low battery alarm, the alarm will sound again every fifteen minutes until the voltage drops to the “Very Low Battery” level.

The “Very Low Battery” level occurs when the battery voltage drops to 3.13 volts. Due to the risk of imminent shut down, when the battery voltage reaches the “Very Low Battery” level it is no longer possible to silence the low battery alarms. At this point, it is necessary to immediately leave the hazardous area in which the instrum ent is being used.

When the voltage drops to 3.10 volts, the PhD Lite will display a "Dead Battery" message to warn the user of imminent shut down. The instrument will then automatically turn itself off.

After any low battery alarm the batteries should be replaced if the PhD Lite is equipped with alkaline batteries or the battery should be recharged if the PhD Lite is equipped with a NiMH rechargeable battery.

The PhD Lite must be located in a non-hazardous location whenever the alkaline batteries are removed from the instrument. Removing the alkaline batteries from the instrument in a hazardous location may impair intrinsic safety.

Use only Duracell MN1500 or Ultra MX1500, Eveready Energizer E91-LR6, Eveready EN91, Radio Shack 23-874 (not ATEX approved) size AA 1.5V Alkaline batteries, Eveready CH15 (not ATEX approved) or Radio Shack 23-149 (not ATEX approved) size AA 1.2V NiCad batteries, or Eveready L91 size AA 1.5V Lithium batteries (not CSA or ATEX approved). Substitution of batteries may impair intrinsic safety.

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1.5.5 Other alarms and special microprocessor features

PhD Lite software includes a number of additional alarms designed to ensure the proper operation of the instrument. When the PhD Lite detects that an electronic fault or failure condition has occurred, the proper audible and visible alarms are activated and an explanatory message is displayed.

The PhD Lite is designed to detect

potentially life threatening atmospheric conditions. Any alarm condition should be taken seriously. The safest course of action is to immediately leave the affected area, and return only after further testing determ i nes that th e area i s once a gain safe f or entry.

1.6 Other electronic safeguards

Several automatic programs prevent tampering and misuse of the PhD Lite by unauthorized persons. Each time the detector is turned on, the PhD Lite automatically tests the LED alarm lights and audible alarm. The battery is monitored continuously for proper voltage. The PhD Lite also monitors the connection of sensors that are currently installed. The detection of any electronic faults causes the activation of the audible and visible alarms and causes the display of the appropriate explanatory message.

1.6.1 Security beep

The PhD Lite offers a security beep that may be configured to “beep” at defined intervals to indicate that the instrument is turned on.

Optional set-up choices, including security beep settings, are accessed through the Options Menu. See section 3.4.3 for details on the security beep.

1.7 Classification for intrinsic safety

The PhD Lite has the following certifications for intrinsic safety:

UL Class I, Division 1, Groups A, B, C, and D UL Class ll, Division 1, Groups E, F, and G

CSA Class I, Division 1, Gr oups A, B, C, and D ATEX Certific ation:

II 2G EEx ia d IIC T4 (Alkalin e ) / EEx ia d IIC T3 (NiMH) UL International DEMKO A/S 03 ATEX 130960X

The PhD Lite is also CE-Marked (Conformité Européenne). The UL, CSA, and ATEX cert ification marks indicate compliance with United States, Canadian, and European Community requirements. These classifications extend to instrument when operated with the motorized pump .

1.8 Sensors

The PhD Lite can be configured to simultaneously monitor Oxygen, combustible gases and vapors and either one or two toxic gases. Up to three sensors can be installed in

the PhD Lite. With the “Duo Tox” dual channel CO/H

sensor installed, the instrument is capable of displaying readings for up to four different channels of detection: O LEL, CO, and H

S. The sensor configuration of the PhD

Lite can be specified at the time of purchase, or changed in the field by appropriately trained personnel.

A sensor that cannot be calibrated or is found to be out of tolerance must be replaced immediately. An instrument that fails calibration may not be used until testing with known concentration test gas determines that accuracy has been restored, and the instrument is once again fit for use.

Calibration procedures are discussed in detail in Chapter 4.

1.9 Continuous sample draw pump

An optional slip-on, motorized sample-draw pump is available for situations requiring continuous "hands free"

remote monitoring.

The pump contains a pressure sensor that detects restrictions in airflow caused by water or other fluids being drawn into the unit and immediately acts to turn the pump off in order to protect the sensors, pump, and other PhD Lite components from damage.

Pump status is continuously monitored by the PhD Lite microprocessor. A spinning “

” icon located in the upper

left hand corner of the LCD display indicates that the pump is attached and in normal operation. Low flow or other pump fault conditions activate audible and visible alarms and cause the display of the appropriate explanatory message.

1.10 Black box data recorder

Starting with instrument firmware version 1.29, every PhD Lite purchased without a datalogger has included a “black box” data recorder that functions similarly to a datalogger, with one important distinction. The data stored in a PhD Lite with a datalogger option can be accessed directly by the user with Biosystems’ Biotrak Database Software. Instruments with the black box data recorder must be sent back to Biosystems for data retrieval.

If the data stored in a PhD Lite equipped with a black box data recorder is needed, simply call Biosystems’ Instrument Service Department at (860) 344-1079 for a return authorization number and send the instrument back to Biosystems. Biosystems will extract the data from the instrument and print an incident report at no charge. You only pay for shipping.

Datalogging functions are discussed in detail in Chapter 5.

1.11 Remote Vibrating Alarm

The PhD Lite can be equipped with an optional remote vibrating alarm for use in noisy environments. The MHP1 or MHP-2 remote alarm is designed to be worn on a belt or shirt collar or placed inside a pocket, and is connected to the instrument via a 20" or 40" cable.

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During an alarm condition the MHP-1 will vibrate continuously until the alarm condition is resolved.

Note: To use the MHP-1 or MHP-2 remote alarms, the PhD Lite must be equipped with the remote alarm connector.

1.12 PhD Lite design components (1) Case: The instrument is enclosed in a solid, metal-

plated ABS case. A black PVC gasket between the upper and lower sections of the case protects against leakage or exposure to liquids.

(2) Front face: The front face of the instrument houses

the graphics capable LCD display, MODE button, four navigation arrows, alarm light/IrDA port, and audible alarm port.

(3) LCD display: A graphics capable liquid crystal

display (LCD) meter allows display of readings, messages, menu and other information. An automatically activated backlight allows the display to be read even in low light conditions.

(4) Alarm lig h t / IrDA p o r t: Two bright red LED (light-

emitting diode) alarm lights provide a visual indication of the alarm state. The lights are visible from the front and top of the instrument. The light also functions as the IrDA link to the unit for uploading to and downloading from a PC.

(5) Control buttons: The large rectangular push-button

is called the MODE button. It is used to turn the PhD Lite on and off, to confirm menu selections and to access the automatic calibration sequences. The four triangular navigation arrows are used to scroll or navigate through additional menu choices and screens of information.

(6) Sensor compartment cover: The sensors are

protected by a vented sensor compartment cover. Each sensor is individually protected by its own protective filter cap.

(7) Audible alarm: A cylindrical resonating chamber

extending past the sensor compartment contains the loud audible alarm. Three small circular apertures in the front face of the instrument cover the resonating chamber.

(8) Battery compartment cover: For alkaline units, the

battery compartment cover provides access to the set of three AA alkaline batteries. The cover is held in by a knurled retention screw.

(9) Bottom surface: The belt clip attaches to the bottom

surface of the instrument.

1.13 PhD Lite standard accessories

Standard accessories included with every PhD Lite include sample draw / calibration adapter, hand-aspirated sampledraw kit, 2 feet of additional tubing for use during calibration, reference manual, quick reference card and training CD-ROM.

The sample draw kit consists of a sample draw / calibration adapter, squeeze bulb, sample probe, replacement sample probe filters, and ten feet of tubing.

Standard configurations of the PhD Lite are delivered in a foam-lined box.

1.13.1 Alkaline PhD Lite detectors

If the PhD Lite has been purchased as an alkaline instrument, the standard accessories also include a set of 3 disposable AA alkaline batteries.

For domestic orders, the batteries will be pre-installed in the PhD Lite at the time of delivery (unless otherwise requested).

For some international orders, the batteries may be removed from the instrum ent prior to shipment.

1.13.2 NiMH PhD Lite detectors

If the PhD Lite has been purchased as a “NiMH” instrument, the standard accessories also include a slip

in PhD Lite fast charger.

1.14 PhD Lite kits

PhD Lite detectors may also be purchased as part of a complete kit that includes calibration gas, calibration gas regulator and a hard-shell carrying case.

1.14.1 PhD Lite Confined Space Kits

In addition to the standard accessories listed above, Confined Space Kits also include calibration fittings, fixed-flow regulator with pressure gauge, and appropriate large cylinder(s) of calibration gas in a foam-lined,

waterproof hard-shell carrying case.

1.14.2 PhD Lite Value Packs

PhD Lite Value Packs include an alkaline PhD Lite, all standard accessories, calibration fittings, small cylinder(s) of calibration gas, and fixed flow rate regulator in a foam-lined non-waterproof hard-shell carrying case.

Figure 1.14.2 Major PhD Lite Features (Top and Front Surfaces)

Page 13

Chapter 2. Basic operation

This chapter will cover how to use the PhD Lite for safe work in potentially hazardous atmospheres.

2.1 Operational warnings and cautions

1. The PhD Lite personal, portable gas detector has been designed for the

detection of dangerous atmospheric conditions. An alarm condition indicates the presence of a potentially life-threatening hazard and should be taken very seriously.

In the event of an alarm condition it is important to follow established procedures. The safest course of action is to immediately leave the affected area, and to return only after further testing determines that the area is once again safe for entry. Failure to immediately leave the area may result in serious injury or death.

Use only Duracell MN1500 or Ultra MX1500, Eveready Energizer E91-LR6, Eveready EN91, Radio Shack 23-874 (not ATEX approved) size AA 1.5V Alkaline batteries, Eveready CH15 (not ATEX approved) or Radio Shack 23-149 (not ATEX approved) size AA 1.2V NiC ad batteries, or Eveready L91 size AA 1.5V Lithium batteries (not CSA or ATEX approved). Substitution of batteries may impair intrinsic safety.

The accuracy of the PhD Lite should be checked immediately following any known exposure to contaminants by testing with known concentration test gas before further use. Failure to check accuracy can lead to inaccurate and potentially dangerous readings.

A sensor that cannot be calibrated or is found to be out of tolerance should be replaced immediately. An instrument that fails calibration may not be used until testing with known concentration test gas determines that accuracy has been restored, and the instrument is once again fit for use.

Do not reset the calibration gas concentration unless you are using a calibration gas concentration that differs from

the one that is normally supplied by Biosystems for use in calibrating the PhD Lite.

Customers are stro ngly urged to use only Biosystems calibration materials when calibrating the PhD Lite. Use of non-standard calibration gas and/or calibrati on ki t components can lead to dangerously inaccurate readings and may void the standard Biosystems warranty.

Use of non-standard calibration gas and/or calibration kit components when calibrating the PhD Lite can lead to inaccurate and potentially dangerous readings and may void the standard Biosystems warranty.

Biosystems offers calibration kits and longlasting cylinders of test gas specifically developed for easy PhD Lite calibration. Customers are strongly urged to use only Biosystems calibration materials when calibrating the PhD Lite.

Substitution of components may impair intrinsic safety.

10.

For safety reasons this equipment must be operated and serviced by

qualified personnel only. Read and understand this reference manual before operating or servicing the PhD Lite.

11.

A rapid up-scale reading followed by a declining or erratic reading may indicate a hazardous combustible gas concentration that exceeds the PhD Lite’s zero to 100 percent LEL detection range.

12.

Use only the following chargers to recharge the PhD Lite: U.S. & Canada: 54-26-0201, 54-26-0202, 54-26-0204 Europe: 54-26-0205, 54-26-0206, 54-26-0207

U.K.: 54-26-0208, 54-26-0209

13.

Use only the following pumps with the PhD Lite:

54-26-0101 (Standard), 54-26-0102 (Plated)

2.2 On and off sequences

The rectangular push-button on the top of the PhD Lite case is called the “MODE” button. It is used to turn the PhD Lite on and off, to initiate the automatic calibration sequence, and to confirm menu choices.

2.2.1 Start-up sequence

To turn the PhD Lite on:

1. Press the MODE button once and release it.

Page 14

Several screens will be shown as the instrument loads and evaluates information from the “Smart Sensors” that

are currently installed.

biosystems

OTP V.1. 10

biosystems

PhD Lite V.3.18 Loadin g Sensors

Loadin g Sensors

O2 LEL

S/N 1047 0

Black Bo x DL

Date 19 Sept 2003 Time 14:25

The PhD Lite will then automatically go through an electronic self-test and start-up sequence that will take approximately thirty seconds.

Performing Self

Test

During the self-test sequence, the display backlight will momentarily turn on, the visual LED alarm light will flash, and the audible alarm will sound. The PhD Lite will also determine which “Smart Sensors” are currently installed in the instrument, and whether there have been any changes since the last time the instrument was used. The instrument will then proceed through the time/date and battery/temperature screens.

Batter y = 3.9V Temp = 71F 22C

Note: The temperature shown is actually a reading taken on the inside of the instrument case in the area where the sensors are located and may not correspond with ambient air temperatures. The PhD Lite microprocessor uses these readings to compensate for temperature changes in the sensor compartment.

The instrument will proceed to display the current alarm settings of the sensors it detects.

CURREN T ALARM

LEVELS

LOW ALAR M LEVEL

O2 = 19.5%

Other alarm level screens may be shown depending upon the configuration of the instrument.

Note: PhD Lite alarm settings are adjustable by the user and may be set anywhere within the detection

range of the specific sensor type. Factory default settin gs may be easi ly restored at any time.

Sensor ranges for individual PhD Lite sensors are given in Appendix C.

The procedure for changing alarm settings is discussed in section 3.2.2.

Calibr ation Due

in 30 Days

After the self-test and start-up sequence is completed, the current gas level screen will be shown. This screen displays sensors currently installed and the current readings. When the instrument is operated in “Basic”, “Basic/Peak” or “Technician” mode, numerical readings are shown.

O2 LEL CO H2S

20.9 0 0 0

Current gas l ev el scr e en in Basic, Basi c/Peak and Technician modes with no alarms present.

If the instrument is operated in the “Text Only” mode an “OK” message will be displayed as long as measured concentrations are below the alarm set points. If a reading exceeds an alarm level, the m essage for the affected sensor channel will change from “OK” to a numerical reading, the LED alarm light will flash, and the audible alarm will sound.

O2 LEL CO H2S OK OK OK OK

Current gas level screen in Text Only mode, no alarms present.

2.2.1.1 Other start-up screens

Several additional screens may be shown under some circumstances. Some screens may require the user to acknowledge the message by pressing the MODE button.

2.2.1.1.1 Non-standard alarms

"During the start up sequence, if the instrum ent detects a low oxygen alarm setpoint of less than 18% or an LEL ceiling alarm setpoint of greater than 30%, the LCD will display a warning message indicating non-standard alarms and will then display the non-standard alarm setting(s) for the specific sensor(s)."

WARNIN G Alarms

Non-Standard

LEL Ceil ing=50%

MODE=Acknowledge

Press the MODE button to acknowledge and use the non-standard settings.

Note: Factory default settings may be easily restored at any time. The procedure for restoring factory default alarm settings is covered in section

3.2.4.1.

Page 15

2.2.1.1.2 “Warning Sensor Needs Cal”

The PhD Lite will display the “Warning Sensor Needs Cal” message for any of the following reasons:

1. The instrument’s sensor configuration has been modified since the last time the instrum ent was used.

2. The last calibration was not successfully completed.

3. The current date exceeds the calibration due date that has been programmed into the instrument.

The “Needs Cal” warning message may be acknowledged (and silenced) by pressing the MODE button.

2.2.2 Shut-down sequence

To turn the PhD Lite off, hold the MODE button down until the “Release Button” message appears. After the MODE button is released the display will show the message "Begin SHUTDOWN Please Wait”. The shutdown sequence is complete when the display blanks out.

Begin SH UTDOWN

Please Wait

Savin g Instrument

Data

The PhD Lite will then shut itself off.

2.3 Operating modes

The PhD Lite offers a choice of four modes of operation: "Text Only”, "Basic”, “Basic/Peak” and "Technician”. Mode selection should be based on how much information is required, the skill level of the user, and the nature of the job.

• Displays ‘OK’ for gas-level concentr ations unless an alarm

condition is pr esent.

• Upon alarm c ondition, actual gas-level concentrations will

be displayed.

• 2 screens available (toggle by pressing the MODE button):

1. Current gas readings scr een (s ee below).

2. Information screen (see below).

• Gas-level concentrations always displayed.

• Access to calibration funct ions.

• 2 screens available (toggle by pressing the MODE button):

1. Current gas readings screen (s ee below).

2. Information screen (see below).

Text Only M o de:

Basic Mode:

• Gas-level concentrations always displayed.

• Access to calibration functions.

• 3 screens available (scroll by pressing the MODE

button):

1. Current gas readings screen (s ee below).

2. Peak readings screen (s ee below).

3. Information screen (see below).

• Gas-level concentrations always displayed.

• Access to calibration functions.

• 4 screens available (scroll by pressing the MODE

button):

1. Current gas readings screen (s ee below).

2. Peak readings screen (s ee below).

3. STEL/TWA/AVG readings screen (see below).

4. Information screen (see below).

Basic/Peak Mode

Technician Mode:

The INFORMATION screen (shown below) can be accessed from any of the four operating modes by pressing the MODE button.

01:15 15:08

3.9V 71F

Regardless of mode selection, the PhD Lite remembers the peak readings of all gases measured, and is calculating the average readings, Time Weighted Average (TWA) and Short Term Exposure Limit (STEL) for any toxic gas sensors installed. Regardless of mode selection the PhD Lite will go into alarm whenever any alarm set point is exceeded.

2.3.1 Text Only mode

The simplest mode of operation is the "Text Only" mode. In Text Only mode during normal operation, the LCD screen indicates "OK” unless an alarm condition is present.

O2 LEL CO H2S OK OK OK OK

Current gas level screen in Text Only mode, no alarms present.

During an alarm condition the PhD Lite will no longer display “OK” for the sensor that is in alarm. Instead, the display will show the numerical gas reading value for the sensor channel in flashing reverse text.

O2 LEL CO H2S

19.1 OK OK OK

Current gas level screen in Text Only mode, oxygen alarm

PhD Lite alarms are self-resetting unless the alarm latch is enabled. With the PhD Lite’s alarm latch enabled, the audible and visible alarms will continue to sound after the atmospheric hazard has cleared. To reset the alarms, simply press the MODE button. If the PhD Lite’s alarm latch is disabled and the alarm condition is no longer present, the instrument automatically returns to normal operation, and the visible and audible alarms cease without further input from the user.

Page 16

For more information on the alarm latch see section

3.2.3.1.

In Text Only mode, the information screen (see above) is also available to the user. Press the MODE button to toggle back and forth between the current gas level and information screens.

Note: It is n o t possib le to in itiate th e a u tomatic calibration sequence while the PhD Lite is in Text Only mode. To initiate the “Auto-Calibration” procedure, the PhD Lite must be in Basic, Basic/Peak or Technician mode.

2.3.2 Basic mode

Basic mode is designed for users who require numerical sensor readings at all times. In Basic mode numerical gas level readings are always provided and it is possible to initiate the automatic calibration sequence in order to make fresh air and span calibration adjustments.

Calibration procedures are discussed in detail in Chapter 4.

O2 LEL CO H2S

20.9 0 0 0

Current gas l ev el scr e en in Basic, Basi c/Peak and Technician Mode s, no al ar m s pr e sen t .

An alarm condition occurs when one of the sensor readings exceeds the pre-set alarm level. When an alarm condition occurs, the display will show the numerical gas reading value for the sensor channel in flashing reverse text, the LED alarm lights will flash, and the audible alarm will sound.

LEL CO H

19.1 0 0 0

Current gas l ev el scr e en in Basic, Basi c/Peak and Technician Modes, alarm condition.

PhD Lite alarms are self-resetting unless the alarm latch is enabled. When the PhD Lite’s alarm latch is enabled, the audible and visible alarm will continue to sound after the atmospheric hazard has cleared. To reset the alarms after the atmospheric hazard has cleared, simply press the MODE button. If the PhD Lite’s alarm latch is disabled and the alarm condition is no longer present, the instrument automatically returns to normal operation, and the visible and audible alarms cease without further input from the user.

For more information on the alarm latch see section

3.2.3.1.

In Basic mode, the information screen is also available to the user. While in Basic mode the MODE button may be used to toggle back and forth between the current gas level and information screens.

2.3.3 Basic/Peak mode

The Basic/Peak mode of operation provides users with numerical sensor readings and access to the peak readings screen. In Basic/Peak mode it is possible

initiate the automatic calibration sequence in order to make fresh air and span calibration adjustments.

Calibration procedures are discussed in detail in Chapter 4.

2.3.3.1 Peak readings

Peak readings for the accumulations of combustible gases and vapors, and for the accumulation of toxic gases represent the highest values registered by the instrument during the period of operation. Peak readings are updated at a rate of once per second. Peak readings for oxygen include both the highest and lowest values registered by the instrument during the period of operation.

PEAK LOW HIGH O2 20.7 20.9

Peak oxygen readings screen in Basic/Peak and Technician mode s.

PEAK LEL CO H2S 0 0 0

Peak LEL and toxic readings screen in Basic/Peak and Technician mode s.

While in Basic/Peak mode the MODE button may be used to scroll through the current gas level, peak readings, and information screens.

2.3.3.2 To reset peak readings

Peak readings may be reset during any period of operation. To reset the peak readings:

1. Press the MODE button until the peak oxygen reading screen appears.

PEAK LOW HIGH

20.7

20.9

2. Hold the right navigation arrow down for approximately one second or until the following screen appears:

Reset Pe aks?

YES NO

3. With YES highlighted, press the MODE button to reset the peak settings

Note: If peak readings are reset, the PhD Lite’s data recorder automatically records that the peak readings have been reset and the word “PEAK” in the peak readings screen will be highlighted for the remainder of the current operating session.

PEAK LOW HIGH

20.7

2.3.4 Technician mode

Technician mode provides access to all advanced functions and displays of the PhD Lite.

20.9

Page 17

While in Technician mode the MODE button may be used to scroll through the current gas level, peak readings, STEL, TWA, AVG and information screens.

2.3.4.1 STEL

The STEL (Short Term Exposure Limit) for a particular toxic gas is the maximum average concentration to which an unprotected worker may be exposed in any 15 minute interval during the day. The STEL value displayed by the PhD Lite is the average concentration for the most recently completed 15 minutes of operation.

Note: For the first 15 minutes after the PhD Lite is initially turned on the STEL reading is a projected value. The PhD Lite will begin projecting a STEL value after the first 30 seconds of operation. For the first 30 seconds the STEL screen will show an "X" where the reading should be.

The STEL reading is continuously updated. Audible and visible alarms will be activated immediately any time the most recent 15-minute average exceeds the STEL alarm set point.

STEL CO H2S 0 0

STEL screen in Technician Mode:

Appendix A discusses Permissible Exposure Limit alarm calculations in greater detail.

2.3.4.2 TWA readings

Time Weighted Average or TWA values are calculated by taking the sum of exposure to a particular toxic gas in the current operating session in terms of parts-permillion-hours and dividing by an eight-hour period.

TWA CO H2S 0 0

TWA screen in Technician Mode:

Note: It is not possible to calculate a toxic gas TWA reading until the PhD Lite has been operating for 15 mi nutes. For the first 15 m inutes after start-up, t he TWA screen will show an “X” in place of the calculation. After 15 minutes, the TWA calculation will be shown.

Appendix A discusses Permissible Exposure Limit alarm calculations in greater detail.

2.3.4.3 Average readings

The average readings displayed by the PhD Lite are the simple arithmetic averages registered by the instrument during the current operating session.

AVERAGE O2 LEL

20.9 0

Average readings screen for O2 and LEL in Technician Mode.

2.3.5 Changing operating modes

To change operating mode:

1. Press the MODE button until the information

screen is displayed.

01:15 15:08

3.9V 71F MENU

2. Hold down the left arrow key until EXIT appears and is highlighted (approximately three seconds).

01:15 15:08

3.9V 71F

3. Press the down navigation arrow once to highlight MENU and press the MODE button to enter the Main Menu.

EXIT

01:15 15:08

3.9V 71F

ALARMS CALIBRATION OPTIONS SCREEN VIEW TIME

EXIT

4. Use the navigation arrows to highlight OPTIONS and press the MODE button to enter the Options Menu.

ALARMS CALIBRATION

OPTIONS

VIEW TIME DISPLAY EXIT

USER_MODE SEC_BEEP PASSCODE LANGUAGE DECIMAL T_UNITS

EXIT

5. Once in the Options Menu, use the navigation arrows to highlight USER MODE and press the MODE button. The up and down navigation arrows may then be used to toggle between operating modes.

USER_MODE

PASSCODE LANGUAGE

DECIMAL T_UNITS

SCREEN

EXIT

SEC_BEEP

EXIT

Operat ing Mode

Text Only

↑↓

EXIT

Operat ing Mode

Basic

↑↓

EXIT

Operat ing Mode

Basic/Peak

↑↓

EXIT

Operat ing Mode

Technician

6. Once the preferred operating mode is shown, confirm the selection by pressing the MODE button.

EXIT

Page 18

Save Ch anges?

YES NO CANCEL

7. Press the MODE button with YES highlighted to save the new operating mode.

Note: Changing the operating mode or otherwise reprog ramming the PhD Li te is reserved for authorized employees.

2.4 Batteries

The PhD Lite can be equipped with either Alkaline of NiMH rechargeable batteries

a non-hazardous location whenever the alkaline batteries are removed from the instrument. Removing the alkaline batteries from the instrument in a hazardous location may impair intrinsic safety.

2.4.1 Alkaline batteries

The PhD Lite with alkaline batteries is designed to provide up to 17 hours of continuous use with each set of 3 fresh AA-cell disposable alkaline batteries.

Operation times may be reduced if the PhD Lite is used with the motorized pump or in low light conditions where the instrument backlight is on.

2.4.1.1 Replacing alkaline batteries

1. Check that the PhD Lite is not located in a hazardous (potentially combustible) area.

2. Make sure that the PhD Lite is turned off.

3. Loosen the battery retention screw located at the top of the instrument, remove the battery cap and then remove the alkaline batteries.

4. Install new batteries in accordance with the diagram underneath the battery cap and reinstall the battery cap.

Not e: Always di spos e of alkaline batter ies in accordance with local ordinances.

Note: The PhD Lite is designed to turn itself on whenever the batteries are removed and then replaced. This ensures that in the event of a power interruption, the instrument automatically turns it self back o n. Any time the batt eries are momentarily removed or repl ace d it will be necessary to manually turn the PhD Lite off if the instrument is not going to be put into immediate use.

Ultra MX1500, Eveready Energizer E91-LR6, Eveready EN91, Radio Shack 23-874 (not ATEX approved)size AA, 1.5V Alkaline batteries, Eveready CH15 (not ATEX approved) or Radio Shack 23-149 (not ATEX approved) size AA 1.2V NiCad batteries, or E veready L9 1 size AA 1.5V Lith ium ba t teries (not CSA or ATEX approved). Substitution of batteries may impair intrinsic safety.

The PhD Lite must be located in

Use only Duracell MN1500 or

2.4.2 NiMH rechargeable battery

The PhD Lite may be equipped with a rechargeable NiMH (nickel metal hydride) battery that is designed to provide up to 17 hours of continuous use between charging cycles. The NiMH battery pack is contained inside of the PhD Lite and should only be replaced by appropriately trained personnel.

Operation tim es may be reduced if either alkaline or NiMH PhD Lites are used with the motorized pump or in

low light conditions where the instrument backlight is on.

2.4.2.1 Storage guidelines for the NiMH battery.

Never store NiMH-version PhD Lite instruments at temperatures above 30 degrees Celsius (86 degrees Fahrenheit). Nickel Metal Hydride batteries may suffer deterioration resulting in damage to the internal components when stored at high temperatures. The battery may be irretrievably damaged resulting in reduced battery capacity and voltage.

Biosystems recommends leaving PhD Lite instruments with NiMH rechargeable batteries on the charger when not in use.

2.4.2.2 Charging guidelines for NiMH battery

The NiMH battery in the PhD Lite should never be charged at temperatures lower than 5 degrees Celsius (40 degrees Fahrenheit) or higher than 30 degrees Celsius (86 degrees Fahrenheit. Charging at temperature extremes can cause permanent damage the PhD Lite NiMH battery.

The PhD Lite must be located in a non-hazardous location during the charging cycle. Charging the PhD Lite in a hazardous location may impair intrin sic safety.

Use only the following Biosy s tems charg ers to ch a rge the P h D L ite: U.S. & Canada: 54-26-0201, 54-26-0202, 54-26-0204. Europe: 54-26-0205, 54-26-0206, 54-26-0207. U.K.: 54-26-0208, 54-26-0209

2.4.2.3 Charging procedure for NiMH battery

1. Verify that the instrument is turned off. (If it is not,

press the MODE button for three seconds until the message "Release Button" appears.)

2. Plug the power supply in and check to see that the

“POWER” indicator LED on the charging cradle is lit.

3. Insert the PhD Lite into the charging cradle. While

the battery is charging the red ‘FAST’ indicator LED will be lit on the charger.

Note: The “Char g e” L ED indicator will initially light up and remain lit for the first 15 minutes regardless of battery pack voltage.

4. Charging will be completed in 2 hours or less, and

will be indicated by the green ‘’TRICKLE’ indicator

Page 19

LED. Charging is complete any time after the “TRICKLE” indicator is lit.

CAUTION To achieve optimal charge and ensure

long battery life of the NIMH battery, make sure that charging takes place in an area where the ambient air temperature is between 40 and 86 degrees Fahrenheit (5 and 30 degrees Celsius). Charging the battery in temperatures above or below this range can damage the battery and will drastically affect battery life.

2.4.3 Low battery alarms Note: The voltage figures given below are for PhD

Lite instruments with firmware version 3.18 and may be slig htly diff eren t for units wit h othe r vers ions of instrument firmware.

When the voltage drops to 3.10 volts, the PhD Lite will display a "Dead Battery" message to warn the user of imminent shut down. The instrument will then automatically turn itself off.

2.5 Methods of sampling

The PhD Lite may be used to sample the immediate vicinity in diffusion mode, or it may be used to sample remote locations. Sampling remote locations requires the use of either the manual sample draw kit that is included with the PhD Lite at purchase, or the PhD Lite motorized sample pump that is available separately.

Use only Duracell MN1500 or

In normal operation, the PhD Lite functions as a diffusion-style gas detector. The atmosphere reaches the sensors by diffusing through the vents in the sensor compartment cover. Normal air movements are enough to carry the sample to the sensors. Once turned on, the PhD Lite monitors continuously. The sensors react quickly to changes in the concentrations of the gases being measured. This type of "diffusion" operation monitors only the atmosphere immediately surrounding the detector.

To sample more remote locations. It is necessary to use one of the two sample-draw kits that are available for the PhD Lite. A manual sample draw kit comes as a standard accessory with every PhD Lite and includes a sample draw probe, squeeze bulb and ten feet of tubing. A motorized sample draw pump is also available. In either case the sample is drawn in through a sample draw probe, and then proceeds through a length of hose back to the sensor compartment.

2.5.1 Using the hand-aspirated sample draw kit

1. Connect the end of the hose that is closer to the

squeeze bulb to the sample draw adapter. Then connect the other end of the hose to the sample

probe as shown in Figure 2.5.1.1.

2. Attach the sample draw adapter to the PhD Lite as

shown in Fi gure 2.5.1.2.

3. Cover the end of the sample draw probe assembly

with a finger, and squeeze the aspirator bulb. If there are no leaks in the sample draw kit components, the bulb should stay deflated for a few seconds.

4. Insert the end of the sample probe into the location

to be sampled.

5. Squeeze the aspirator bulb several times to draw

the sample from the remote location to the sensor compartment. Allow one squeeze of the bulb for every one foot of sampling hose for the sample to reach the sensors. Continue to squeeze the bulb for an additional 45 seconds or until readings stabilize.

6. Note the gas measurement readings.

Figure 2.5.1.1. Hand-aspirated sample draw kit

Page 20

Figure 2.5.1.2. PhD Lite with hand-aspirated sample draw kit attached

CAUTION: Hand aspirated remote sampling only

provides continuous gas readings for the area in which the probe is located when the bulb is being continuously squeezed.

Note: Each time a reading is desired, it is necessary to squeeze the bulb a sufficient number of times to bring a fresh sample to the sensor compartment.

2.5.2. Motorized sample draw pump

Use of the motorized sample draw pump allows the PhD Lite to continuously monitor remote locations. The pump is powered by the PhD Lite battery. When the pump is attached and functioning normally, an animated

” icon will appear in the upper left hand corner of the

“ LCD display.

 O2 LEL CO H2S

20.9 0 0 0

CAUTION: Never perform remote sampling with

the PhD Lite without the sample probe assembly. The sample probe handle contains replaceable filters designed to block moisture and remove particulate contaminants. If the pump is operated without the probe assembly in place, contaminants may cause damage to the pump, sensors and internal components of the PhD Lite.

The sample draw pump includes a pressure sensor designed to protect the PhD Lite from exposure to water or other liquids. If there is a change in pressure in the sample draw assembly due to fluid intake or other blockage, the pump immediately shuts down. After a few seconds audible and visible alarms indicating a low flow condition will also be activated.

CAUTION: Insertion of the sample draw tube

into a fluid horizontally or at a low angle may lead to

water ingress and may cause damage to the PhD Lite.

The pressure sensor in the sample draw pump is designed to detect pressure changes while the sampledraw probe is being held in a vertical position. If the probe is held horizontally or at a low angle while inserted into a fluid, a pressure drop sufficient to cause the pump to shut down may not be generated, and water could be drawn into the pump assembly causing damage to the pump, sensors and internal components of the PhD Lite.

To avoid potential damage, care must be taken to keep the probe vertical whenever fluids may be present.

with the PhD Lite: 54-26-0101 (Standard), 54-26-0102 (Plated)

2.5.2.1 Using the continuous sample draw pump

1. Connect the pump to the hose and probe assembly

as shown below in Figure 2.5.2.1.

2. Slide the pump onto the PhD Lite as shown in

Figure 2.5.2.2.

3. Make sure the pump is securely attached. Tighten

the captive screw.

4. Turn on the PhD Lite. The pump will be activated

automatically when properly attached to the PhD Lite. The display will indicate that the pump has been detected.

5. When prompted cover the end of the sample draw

probe assembly with a finger. If there are no leaks in the sample draw components, a message will be displayed indicating that the pump test passed.

6. Insert the end of the sample probe into the location

to be sampled.

7. Wait long enough for the pump to have drawn the

sample through the entire length of hose, and for the sensors to have stabilized. (Allow one second for each foot or three seconds for each meter of sample hose for the sample to reach the sensors)

8. Note the gas measurement readings

Use only the following pumps

Pump De tected

Pump Testing Block Sa mple

Pump Test Passed

Press Mo de

Page 21

Figure 2.5.2.1. Motorized sample draw pump and probe assembly

2.5.2.2 Protective “low flow” shut-downs

If a protective pump shut-down occurs, the following steps should be taken before the instrument is put back into use:

1. Turn off the PhD Lite detector and disconnect the sample draw pump.

2. Rem ove the sample draw assembly from the area being monitored. Be careful to keep the sample draw probe in a vertical position.

3. Examine the sample draw probe and hose to make sure no fluids remain trapped.

4. Allow any trapped fluids to completely drain. (It may be necessary to disconnect the hose or sample draw probe before drainage can occur.)

5. Replace the filters in the sample draw probe as necessary.

6. Re-attach the pump in fresh air and wait for readings to stabilize.

7. Resume sampling.

Figure 2.5.2.2. PhD Lite with motorized sample draw pump attached

2.5.2.3 Resuming diffusion monitoring

To resume diffusion monitoring, simply disconnect the pump assembly from the PhD Lite. The audible and visual alarms will be activated and the LCD will display the message “Pump Disconnect”. Press the MODE button to acknowledge the disconnection and resume normal diffusion operation.

Pump Di sconnected

Press Mo de

2.5.3 Sample probe assembly

The sample probe handle contains moisture barrier and particulate filters designed to remove contaminants that might otherwise harm the instrum ent.

CAUTION: Never perform remote sampling

without the sample probe and hose assembly. The sample probe handle contains replaceable filters designed to block moisture and remove particulate contaminants. If the pump is operated without the probe assembly in place, contaminants may cause damage to the pump, sensors and internal components of the PhD Lite.

Particulate contaminants are removed by means of a cellulose filter. The hydrophobic filter includes a 0.1 µm Teflon™ barrier which blocks the flow of moisture as well as any remaining particulate contaminants.

Sample probe filters should be replaced whenever visibly discolored due to contamination. A spare filter replacement kit (Biosystems part number 54-05-K0401) is included with every PhD Lite.

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Figure 2.5.3. PhD Lite sample probe assembly

2.5.3.1 Changing sample probe filters

The threaded sample probe handle is unscrewed (as

shown in Figure 2.5.3.) to provide access to the filters.

The particulate filter is held in place by means of a clear filter cup. To replace the particulate filter, remove the old filter and cup, insert a new filter into the cup, and slide the cup back into place in the probe handle. The hydrophobic barrier filter fits into a socket in the rear section of the probe handle. (The narrow end of the hydrophobic barrier filter is inserted towards the rear of the handle.)

2.5.3.2 Changing sample probe tubes

The standard 11.5” long butyrate probe tube is held in place by means of a hex-nut compression fitting and compression sleeve. The standard probe tube is designed to be easily interchangeable with other custom length sections of 1/4” OD tubing, or probe tubes made of other materials (such as stainless steel).

Probe tubes are exchanged by loosening the hex-nut compression fitting, removing the old tube, sliding the compression sleeve into place around the new tube, inserting the new tube into the probe handle, then replacing and tightening the hex-nut.

Note: The sample probe must be checked for leakage (as discussed in Section 2.5.1.) whenever

filters or probe tubes are exchanged or replaced before being put back into service.

2.6 Biosystems EEPROM equipped “Smart Sensors”

Each sensor installed in a PhD Lite detector is equipped with its own non-volatile memory storage device or “EEPROM”. The contents of the sensor’s memory device are designed to be read and updated directly by the PhD Lite. The fact that each sensor is capable of remembering and communicating important information about itself to the instrument allows for a number of

important PhD Lite operating benefits.

2.6.1 Identification of type of sensor by instrument

Sensors installed in the PhD Lite automatically identify themselves to the instrument microprocessor. The PhD Lite automatically displays the recognized sensors on the liquid crystal display (LCD) and assigns the correct alarm settings.

2.6.2 Ot her inform ation stored wi th the sen sor EEPROM

The PhD Lite automatically uploads the sensor serial number, the most recent calibration settings, temperature compensation curves, and current alarm settings whenever the instrument is turned on, whenever a change is made during operation, and whenev er the instrument is turned off.

If a sensor is changed or replaced the PhD Lite recognizes that a change has occurred, displays a “Needs Cal” message the next time the instrument is turned back on, and identifies the affected sensors. Even if the change is only to replace one sensor with another of the same kind, the PhD Lite will still note the change in serial numbers of the sensors installed, and display the “Needs Cal” message.

The accuracy of sensors identified as “Needing Calibration” must be verified by exposure to known concentration calibration gas before the PhD Lite is put back into service. Failure to do so may result in inaccurate and potentially dangerous readings.

2.6.3 Sensor removal and replacement Note: The PhD Lite must be turned off to replace

sensors.

1. Remove the three philips screws and take off the

sensor cover from the front of the instrument.

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For replacement of an existing sensor perform steps 2a and 3a then proceed to step 4a or 4b.

2a. From the outer surface of the sensor cover, use a

flat blade screwdriver to gently push out the metal screen (if present), gasket & filter ring assembly. Discard old gasket, filter ring assembly & metal screen. The metal screen is not to be reused and its absence will not affect sensor performance.

3a. Remove any remaining traces of adhesive from the

recessed hole in the sensor cover.

For new sensor installation perform steps 2b and 3b then proceed to step 4a or 4b.

2b. From the outer surface of the sensor cover, push

out yellow dust cap with a blunt tool.

3b. Remove sensor blank from the sensor

compartm ent.

For Sensors O

, LEL, CO, CO Plus, CO-H, H2S, NO,

DUO-TOX perform step 4a then proceed to step 5.

4a. Firmly press the new filter ring assembly into the

recessed hole in the sensor cover with ridge side up.

For Reactive Gas Sensors: SO

perform step 4b then proceed to step 5.

ClO

, NO2, PH3, HCN, Cl2,

4b. Firmly press the new teflon spacer into the

recessed hole in the sensor cover. For optimal sensor response, no external filter element is used with these sensors.

CAUTION: Since the reactive gas sensor face

is openly exposed to the ambient environment, extra care should be taken to prevent water or any other liquids from coming into contact and remaining on the sensor face.

5. Peel the backing paper from the new rubber gasket and center it over the newly mounted filter ring assembly with the adhesive side down.

6. Remount sensor cover and secure with three philips screws. DO NOT overtighten.

7. Install functional battery pack or batteries in the detector.

8. New sensors must be allowed a stabilizing time – with detector powered off and with functional batteries or battery pack installed, according to the following schedule.

Sensor Stabilization Period

Oxygen (54-25-90) 1 hour LEL (54-25-80A) 5 minutes All Toxic sensors except those shown below 54-25-04 NH3 Sensor 54-25-06 NO Sensor

9. The PhD Lite will automatically recognize the changes that have been made upon turn on and display the “Warning Needs Cal” message.

10. Calibrate the PhD Lite with calibration gas appropriate for the new sensor before the instrument is put back into service.

11. If newly installed sensor(s) do not appear during power-up, or if the message "not supported" appears, contact Biosystems Instrument Service Dept. for further guidance.

15 minutes

24 hours

PhD Lite programming includes safeguards to recognize maladjusted sensors. If the settings on the new sensor are significantly different from those of the sensor that is being replaced, a message indicating that the sensor is reading “Too Low” or “Too High” for Auto-Calibration may follow the first attempt at one-button calibration.

Note: The first fresh air calibration adjustment after installation of a new sensor should be done using the “manual” calibration procedure as discussed in section 4.5 of this manual

Once the new sensor has been fresh-air calibrated using the “manual” calibration procedure, subsequent fresh air and span calibrations can be made by using the MODE button and One-Button Auto-Calibration procedures.

2.6.4 Missing sensor

The PhD Lite is able to recognize when a sensor is removed or becomes disconnected while the instrument is in normal operation. If a sensor becomes disconnected while the instrument is turned on, the PhD Lite will trigger a missing sensor alarm, the corresponding channel of the display will show an “X” in place of the normal sensor readings and the audible and visible alarms will be activated.

2.6.5 “Sensor not found”

If the PhD Lite is suddenly unable to read the EEPROM of a smart sensor currently installed the corresponding sensor channel will show an “X” and the audible and visible alarms for the affected sensor channel will be activated.

If a smart sensor is removed while the instrument is turned off without being replaced with another sensor, a message will be displayed during the start-up sequence indicating that the sensor is missing. Pressing the MODE button acknowledges the condition, and allows the use of the instrument for those sensors that have been successfully detected.

NO TOX1 SENSOR

MODE=Acknowledge

Page 24

Chapter 3. Advanced Functions

The microprocessor circuitry in the PhD Lite makes modifications to the operational set-up parameters easy. By using the MODE button and four navigation arrows located on the instrument keypad, the user can access the Main Menu, which provides access to the operational set-up choices for the instrument.

Note: This chapter covers advanced functions in units without the datalogger upgrade. Some menu items may be slightly different for instruments with the datalogger upgrade. Chapter 5 covers options unique to instruments with the datalogger upgrade.

Reprogramming the PhD Lite is reserved for authorized personnel.

3.1 The Main Menu

The Main Menu provides access to all user-configurable options of the PhD Lite.

3.1.1 Entering the Main Me n u

1. Turn the instrument on and wait until the gas readings screen appears.

2. Press the MODE button until the information screen is displayed.

01:15 15:08

3.9V 71F

3. Hold down the left navigation arrow for 3 seconds or until EXIT appears and is highlighted.

01:15 15:08

3.9V 71F

4. Press the down navigation arrow once to highlight MENU and press the MODE button. The Main Menu will then be displayed.

3.2 The Alarm Menu

PhD Lite gas level alarms are user-adjustable and may be set anywhere within the range of the sensor channel. When the alarm set point for a specific sensor channel is exceeded, the audible alarm sounds, the bright red LED alarm light blinks, and the alarm channel is displayed in flashing reverse text.

PhD Lite alarms are self-resetting unless the alarm latch is enabled. With the alarm latch disabled, visible and audible alarms cease when gas readings drop back below the pre-set alarm levels. With the alarm latch enabled, visible and audible alarms continue to sound after the atmospheric hazard has cleared. The user must then manually reset the alarms by pressing the MODE button.

Alarm latch settings are discussed in section 3.2.3.

ALARMS CALIBRATION OPTIONS SCREEN VIEW TIME

EXIT

Factory default settings can be restored at any time during normal operation by using the procedures discussed in section 3.2.4.

3.2.1 Entering the Alarm Menu

1. Enter the Main Menu as described above in section

3.1.1. Use the navigation arrows to highlight ALARMS.

ALARMS

OPTIONS SCREEN VIEW TIME

CALIBRATION

EXIT

2. Press the MODE button to enter the Alarms Menu. The Alarms Menu will then be displayed.

3.2.2 Custom alarm settings

CUSTOM LATCH DEFAULT TEMPERATURE WARNINGS

EXIT

PhD Lite gas alarms are user-adjustable and may set anywhere within the range of the sensor channel.

Sensor ranges for individual PhD Lite sensors are given in Appendix C.

To enter custom alarm settings:

1. Enter the Alarm Menu as described above in section 3.2.1. Use the navigation arrows to highlight CUSTOM.

CUSTOM

DEFAULT TEMPERATURE WARNINGS EXIT

LATCH

2. Press the MODE button. “ALARM ADJUSTMENT” will be shown followed by the current alarm settings.

ALARM AD JUSTMENT

LOW ALAR M ADJUST O2 = 19.5 %

3. Use the right and left navigation arrows to scroll through the sensors and their alarm settings until the alarm that requires adjustment is displayed

EXIT

LOW ALAR M ADJUST O2 = 19.5 %

→

EXIT

HIGH ALARM ADJUST O2 = 23.5 %

→

EXIT

HIGH ALARM ADJUST LEL = 10 %

4. Once the alarm that requires adjustment is reached, use the up and down navigation arrows to adjust the alarm value.

EXIT

Page 25

HIGH ALARM ADJUST LEL = 10 %

↓

EXIT

HIGH ALARM ADJUST LEL = 9 %

5. Once the desired alarm setting is reached, press the MODE button to confirm the selection or move to another sensor by following steps 3 and 4 above.

EXIT

Save Ch anges?

YES NO CANCEL

6. Press the MODE button with YES highlighted to save the new alarm settings. The instrument will then return to the Main Menu.

Alarm Le vels

Saved

3.2.3 Alarm and OK latches

The PhD Lite includes alarm latch and OK latch functions that can be enabled or disabled according to the user’s requirements.

3.2.3.1 Alarm latch settings

When the PhD Lite’s alarm latch is enabled, the audible and visible alarms will continue to sound after the atmospheric hazard has cleared. To reset the alarm after the hazard has cleared, simply press the MODE button.

When the PhD Lite’s alarm latch is disabled and the alarm condition is no longer present, the instrument automatically returns to normal operation, and the visible and audible alarms cease without further input from the user.

To adjust the alarm latch settings:

1. Enter the Alarm Menu as described above in section 3.2.1 and use the navigation arrows to highlight LATCH.

CUSTOM DEFAULT TEMPERATURE WARNINGS EXIT

LATCH

2. Press the MODE button. The current latch settings will then be shown.

ALARM LATC H

SETTINGS

ALARM LATC H DISABLED

3. Once the alarm latch setting is shown, the up and down navigation arrows may be used to toggle between ENABLED and DISABLED.

ALARM LA TCH

DISABLED

↓↑

ALARM LA TCH

ENABLED

4. Once the desired setting is reached, press the MODE button to confirm the setting.

Save Ch anges?

YES NO CANCEL

5. Press the MODE button with YES highlighted to save the new latch settings. The instrument will then return to the Main Menu.

Alarm La tch

Saved

3.2.3.2 OK latch settings

If an alarm condition occurs and clears while the PhD Lite is operated in text-only mode with the OK latch enabled, the instrument will continue to display numeric readings for the sensor that was in alarm. This allows the user to know that an alarm condition was present during the current operating session.

If an alarm condition occurs and clears while the PhD Lite is operated in text-only mode with the OK latch disabled, the PhD Lite will again display OK for the sensor that was in alarm.

To adjust the OK latch settings:

1. Enter the Alarm Menu as described above in section 3.2.1 and use the navigation arrows to highlight LATCH.

CUSTOM DEFAULT TEMPERATURE WARNINGS EXIT

LATCH

2. Press the MODE button. The current alarm latch setting will then be shown.

ALARM LATC H

SETTINGS

ALARM LATC H DISABLED

3. Press the right navigation arrow once to move from the alarm latch setting to the OK latch setting

ALARM LATC H DISABLED

→

OK LATCH DISABLED

Page 26

4. Once the latch setting is shown, the up and down navigation arrows may be used to toggle between ENABLED and DISABLED.

OK LATCH DISABLED

↓↑

OK LATCH ENABLED

5. Once the desired setting is reached, press the MODE button to confirm the selection.

Save Ch anges?

YES NO CANCEL

6. Press the MODE button with YES highlighted to save the new latch settings. The instrument will then return to the Main Menu screen.

Alarm La tch

Saved

3.2.4 Default alarm settings

PhD Lite alarm settings are set at the factory and may be restored at any time by performing the following procedure.

3.2.4.1 Restore factory default alarm settings

1. Enter the Alarm Menu as described above in section 3.2.1 and use the navigation arrows to highlight DEFAULT.

CUSTOM LATCH

DEFAULT

WARNINGS EXIT

TEMPERATURE

2. Press the MODE button. The default low alarm setting for oxygen will then be displayed. If the instrument does not have an oxygen sensor, then the LEL or toxic alarm default setting will be shown.

DEFAUL T ALARM

LEVELS

DEF LOW AL ARM

O2 = 19.5 %

3. The right and left navigation arrows are used to scroll through the various default alarm settings.

EXIT

DEF LOW AL ARM

O2 = 19.5 %

→

EXIT

DEF HIGH ALARM

O2 = 23.5 %

→

EXIT

DEF HIGH ALARM

LEL = 10 %

4. Press the MODE button at any time to exit.

EXIT

Set Def Al arms?

YES NO CANCEL

5. Press the MODE button with YES highlighted to restore default alarms. The instrument will then return to the Main Menu screen.

Alarm Le vels

Saved

3.2.5 Temperature alarm

The PhD Lite includes both high and low temperature alarms for all sensors recognized by the instrument. The alarm setpoints are pre-programm ed into the individual sensor EE-proms and may not be modified in any way, but the high or low temperature alarms for all recognized sensors can be enabled or disabled depending on the needs of the user.

3.2.5.1 Enable/disable temperature alarms

1. Enter the Alarm Menu as described above in section 3.2.1 and use the navigation arrows to highlight TEMPERATURE.

CUSTOM LATCH DEFAULT WARNINGS EXIT

TEMPERATURE

2. Press the MODE button. The enabled/disabled setting for the low temperature alarm will be displayed. The right and left navigation arrows are used to toggle between the high and low temperature alarm settings.

LOW TEMP ALARM DISABLED

← →

EXIT

HIGH TEMP ALARM DISABLED

3. Once the alarm that required adjustment is shown, the up and down navigation arrows are used to toggle between ENABLED and DISABLED.

EXIT

HIGH TEMP ALARM DISABLED

↑↓

EXIT

HIGH TEMP ALARM ENABLED

4. Once appropriate setting is shown, press the MODE button to enter the new setting.

EXIT

Page 27

Save Ch anges?

YES NO CANCEL

5. Press the MODE button with YES highlighted to save the new temperature alarm settings.

Temperature Alarm

Saved

3.2.6 Warning alarms.

The PhD Lite includes adjustable warning alarms for the toxic and combustible gas sensor channels that can be enabled or disabled according to the needs of the user. Warning alarms are normally set slightly lower than the actual alarm to warn the user of potential danger.

3.2.6.1 Access warning alarm settings

1. Enter the Alarm Menu as described above in section 3.2.1 and use the navigation arrows to highlight WARNINGS.

CUSTOM LATCH DEFAULT TEMPERATURE

WARNINGS

EXIT

2. Press the MODE button. The following screen will then be displayed:

3.2.6.2 Enable/disable warning alarms

ENABLE ADJUST TIMEOUT

EXIT

1. Enter the warning alarm subdirectory of the Alarm Menu as described above in section 3.2.6.1. Use the navigation arrows to highlight ENABLE.

ENABLE

ADJUST TIMEOUT EXIT

2 Press the MODE button. The enabled or disabled

setting will then be shown. The up and down navigation arrows may then be used to toggle between enabled and disabled.

WARNINGS ENABLED

↑↓

EXIT

WARNINGS DISABLED

3. Once the appropriate setting is shown, press the MODE button to enter the new setting.

EXIT

Save Ch anges?

YES NO CANCEL

4. Press the MODE button with YES highlighted to save the new warning alarm setting.

3.2.6.3 Adjust warning alarm levels

1. Enter the warning alarm subdirectory of the Alarm Menu as described above in section 3.2.6.1. Use the navigation arrows to highlight ADJUST.

ENABLE

ADJUST

TIMEOUT EXIT

2. Press the MODE button. The warning alarm setting for either the LEL or toxic sensor will then be shown.

Note: The warning alarm must be enabled for the warning alarm level to be shown. Section 3.2.6.2 above covers enabling the warning alarms.

HIGH WA RNING ADJ.

LEL = 5 %

3. The right and left navigation arrows to scroll through the various default alarm levels for the LEL and toxic sensors.

EXIT

HIGH WA RNING ADJ.

LEL = 5 %

→

EXIT

HIGH WA RNING ADJ.

CO = 17ppm

4. To adjust a specific alarm level, use the up and down navigation arrows to change the setting.

EXIT

HIGH WA RNING ADJ.

CO = 17ppm

↑

EXIT

HIGH WA RNING ADJ.

CO = 18ppm

5. Use the right and left arrow keys to reach the next alarm for adjustment and repeat step 4 or press the MODE button to confirm the new warning alarm levels.

EXIT

Save Ch anges?

YES NO CANCEL

6. Press the MODE button with YES highlighted to save the new warning alarm setting.

3.2.6.4 The warning alarm timeout function

The timeout feature is an interval setting that allows the user to acknowledge the warning alarm and suspend it for the length of time specified by the interval.

3.2.6.4.1 Adjust timeout interval

To adjust the timeout interval:

1. Enter the warning alarm subdirectory of the Alarm Menu as described above in section 3.2.6.1. Use the navigation arrows to highlight TIMEOUT.

Page 28

ENABLE ADJUST

TIMEOUT

EXIT

2. Press the MODE button. The timeout interval setting will then be shown. Use the up and down navigation arrows to change the interval setting.

TIMEOU T ADJUST TIME = 5 min

↓

EXIT

TIMEOU T ADJUST TIME = 4 min

3. To confirm the new timeout interval setting, press the MODE button.

EXIT

Save Ch anges?

YES NO CANCEL

4. Press the MODE button with YES highlighted to save the new warning alarm setting.

3.2.6.4.2 Disabling the timeout interval

1. To disable the warning timeout function entirely, follow the directions above in section 3.2.6.4.1 and set the time interval to 0 minutes. The following screen will then be shown.

TIMEOU T ADJUST TIME DISABLED

2. To confirm the new timeout interval setting, press the MODE button.

EXIT

Save Ch anges?

YES NO CANCEL

3. Press the MODE button with YES highlighted to save the new warning alarm setting.

3.3 The Calibration Menu

All calibration functions are covered in detail in Chapter

3.4 The Options Menu

The Options Menu controls operating mode selection, and security beep, language, passcode and toxic decimal settings. Each of these options is described in greater detail below.

3.4.1 Entering the Options Menu

1. Enter the Main Menu as described above in section

3.1.1. Use the navigation arrows to highlight OPTIONS.

ALARMS CALIBRATION

OPTIONS

VIEW TIME EXIT

2. Press the MODE button. The Options Menu will then be shown.

SCREEN

USER_MODE SEC_BEEP PASSCODE LANGUAGE DECIMAL T_UNITS

3.4.2 User Modes

EXIT

3.4.2.1 Overview of user modes

• Displays ‘OK’ for gas-level concentrations unless an alarm

condition is pr esent.

• Upon alarm condition, gas-level conc entrations will be

displayed.

• 2 screens available (toggle by pressing the MODE

button):

1. Current gas readings scr een (s ee below).

2. Information screen (see below)

• Gas-level concentrations always displayed.

• Access to calibration functions.

• 2 screens available (toggle by pressing the MODE button):

1. Current gas readings screen (see below).

2. Information screen (see below).

• Gas-level concentrations always displayed.

• Access to calibration functions.

• 3 screens available (scroll by pressing the MODE

button):

1. Current gas readings screen (see below).

2. Peak readings screen (s ee below).

3. Information screen (see below).

• Gas-level concentrations always displayed.

• Access to all advanced functions.

• 4 screens available (scroll by pressing the MODE

button):

1. Current gas readings screen (see below).

2. Peak readings screen (s ee below)

3. STEL/TWA/AVG readings screen (see below)

4. Information screen (see below)

Text Only M o de:

Basic Mode

Basic/Peak Mode

Technician Mode:

Regardless of mode selection, whenever the PhD Lite is in use it remembers the peak readings of all gases measured, and is calculating both Time Weighted Averages and Short Term Exposure Levels for any toxic gas sensors installed. Regardless of mode selection, the PhD Lite will go into alarm whenever any alarm set point is exceeded.

3.4.2.2 Text Only Mode

The simplest mode of operation is “Text Only" mode. In Text Only Mode during normal operation, the LCD screen does not display numerical readings, only the indication "OK” unless an alarm condition is present.

Page 29

O2 LEL CO H2S OK OK OK OK

Current gas readings screen in Text Only Mode, no alarms present.

If an alarm condition occurs the indication changes from "OK" to the numerical value, the LED alarm lights flash, and the audible alarm sounds.

O2 LEL CO H2S

19.1 OK OK OK

Current gas readings screen in Text Only Mode, oxygen sensor in alarm.

In Text Only Mode, the information screen (see above) is also available to the user. Press the MODE button to toggle back and forth between the current gas level and information screens.

Note: It is n o t poss ib le to in itiate th e “ A utoCalibration” procedure while the PhD Lite is operated in Text Only Mode. To initiate the automatic calibration sequence, the PhD Lite must be in Basic, Basic/Pea k or Techni cian Mode.

3.4.2.3 Basic Mode

In Basic Mode, numerical gas level readings are always provided and it is possible to initiate “Auto-Calibration” in order to make fresh air and span calibration adjustments.

Calibration procedures are discussed in detail in Chapter 4.

O2 LEL CO H2S

20.9 0 0 0

Current gas readings screen in Basic, Basic/Peak and Technician Mode s, no al ar m s pr e sen t .

An alarm condition occurs when one of the sensor readings exceeds the pre-set alarm level. When an alarm condition occurs, the numerical reading changes to reflect the new value, the LED alarm lights flash, and the audible alarm sounds.

O2 LEL CO H2S

20.9 0 0 0

Current gas readings screen in Basic, Basic/Peak and Technician Mode s, O xy gen sensor in al ar m .

In Basic Mode, the information screen (see above) is also available to the user. Press the MODE button to toggle between the current gas and information screens.

3.4.2.4 Basic/Peak Mode

In Basic/Peak Mode, numerical gas level readings are always provided and the peak readings screen is also available. From the current gas readings screen, press the MODE button to scroll through the peak readings screens and the information screen. As in Basic Mode, It is possible to initiate the automatic calibration functions in order to make fresh air and span calibration adjustments.

Calibration procedures are discussed in detail in Chapter 4.

3.4.2.4.1 Peak readings

Peak readings represent the highest and lowest values registered by the instrument during any period of operation. Peak readings are updated once per second.

PEAK LOW HIGH O2 20.7 20.9

Peak oxygen readings screen in Basic/Peak or Technician Mode.

PEAK LEL CO H2S 0 0 0

Peak LEL and toxic readings screen in Basic/Peak or Technician Mode.

In Basic/Peak Mode, the MODE button is used to scroll through the current gas level, peak readings, and information screens.

Note: The procedure for resetting peak readings is covered in section 2.3.3.2.

3.4.2.5 Technician Mode

Technician Mode provides access to all advanced functions and displays, including Auto-Calibration.

In Technician Mode, the MODE button is used to scroll through the current gas level, peak readings, STEL, TWA, average and information screens.

3.4.2.5.1 STEL

The STEL (Short Term Exposure Limit) for a particular toxic gas is the maximum average concentration to which an unprotected worker may be exposed during any 15 minute interval. The STEL value displayed by the PhD Lite is the average concentration for the most recently completed 15 minutes of operation.

STEL CO H2S 0 0

STEL screen in Technician mode.

The STEL reading is updated twice per minute. Audible and visible gas alarms will be activated immediately whenev er the most recent 15-minute average exceeds the STEL alarm set point.

3.4.2.5.2 TWA readings

Page 30

TWA CO H2S 1:45 0 0

TWA screen in Technician Mode.

Appendix A discusses Permissible Exposure Limit alarm calculations in greater detail.

3.4.2.5.3 Average readings

Average readings are calculated by taking the sum of exposure to a particular toxic gas in the current operating session in terms of parts-per-million-hours and dividing by the amount of time that has passed in the current operating session.

AVERAGE O2 LEL

20.9 0

Average readings screen (O2 & LEL) in Technician Mode.

3.4.2.6 Changing the user mode

1. Enter the Options Menu as discussed in section

3.4.1 and use the navigation arrows to highlight USER_MODE.

USER_MODE

PASSCODE LANGUAGE DECIMAL T_UNITS

SEC_BEEP

EXIT

2. Press the MODE button. The up and down arrows may then be used to toggle between operating modes.

Operat ing Mode Text Only

↑↓

EXIT

Operat ing Mode Basic

↑↓

EXIT

Operat ing Mode Basic/ Peak

↑↓

EXIT

Operat ing Mode Techni cian

3. Once the preferred operating mode is displayed, press the MODE button.

EXIT

Save Ch anges?

YES NO CANCEL

4. Press the MODE button with YES highlighted to save the new operating mode.

Note: Changing modes or otherwise reprogramming the instrument is reserved for authorized employees.

3.4.3 Security beep

The security beep is an audible alarm that “beeps” on a regular basis while the PhD Lite is in normal operation. The beep serves as a reminder that the instrument is turned on.

3.4.3.1 Adjusting the security beep

1. Enter the Options Menu as discussed in section

3.7.1

USER_MODE PASSCODE LANGUAGE DECIMAL T_UNITS

SEC_BEEP

EXIT

2. From the Options Menu use the navigation arrows to highlight SEC_BEEP. To enable or disable the security beep, use the right and left navigation arrows to highlight OFF (or ON). The up and down navigation arrows may then be used to toggle between security beep on and security beep off.

Security Beep

Off

↓↑

EXIT

Security Beep

On 01m 00 s

3. The interval setting will appear when the security beep is turned ON (as above). Use the right and left navigation arrows to highlight the interval if it requires adjustment. Then use the up and down navigation keys to adjust the interval.

EXIT

Security Beep On 01m 00s

↑

EXIT

Security Beep On 02m 00s

4. Once the desired interval is reached use the right and left navigation arrows to highlight EXIT.

EXIT

Security Beep On 02m 00s

5. Press the MODE button to enter the new setting.

EXIT

Save Ch anges?

YES NO CANCEL

6. Press the MODE button with YES highlighted to save the new setting.

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3.4.4 Passcode

Access to the automatic span calibration and the following subdirectories of the Main Menu can be restricted through the PhD Lite’s passcode feature: ALARMS, CALIBRATION, OPTIONS, and SCREEN. The DATALOGGER subdirectory will also be restricted on units with the datalogger upgrade.

To enter the Passcode subdirectory of the Options Menu:

1. Enter the Options Menu as discussed in section

3.4.1 and use the navigation arrows to highlight PASSCODE.

USER_MODE SEC_BEEP

PASSCODE

DECIMAL T_UNITS

LANGUAGE

EXIT

2. Press the MODE button. The following screen will then be shown.

CHANGE_PASSCODE

PASSCODE_ON/OFF SPAN-LOCK

EXIT

3.4.4.1 Enable/Disable passcode

To enable or disable the passcode:

1. Enter the passcode subdirectory of the Options Menu as discussed in section 3.4.4.

CHANGE_PASSCODE

PASSCODE_ON/OFF

SPAN-LOCK

EXIT

2. Use the navigation arrows to highlight PASSCODE_ON/OFF and press the MODE button. The up and down navigational arrows are then used to toggle between ENABLED and DISABLED.

PassCode DISABLED

↓↑

EXIT

PassCode ENABLED

Note: If this is the first time that the passcode has been enabled, the PhD Lite will automatically prompt you to enter a new passcode. See section

3.4.4.2 below for more details.

3. Once the desired setting is displayed, press the MODE button to enter the setting.

EXIT

Save Ch anges?

YES NO CANCEL

4. Press the MODE button with YES highlighted to save the new setting.

3.4.4.2 Changing the passcode

To change the passcode:

1. Enter the passcode subdirectory of the Options Menu as discussed in section 3.4.4.

CHANGE_PASSCODE

PASSCODE_ON/OFF SPAN-LOCK

EXIT

2. Use the navigation arrows to highlight CHANGE_PASSCODE and press the MODE button. The new passcode screen will then be shown. Use the right and left navigation arrows to select the digit for change and then use the up and down navigational arrows to change the digit itself.

New Pass code 0 0 0 0

→↑

ENTER EXIT

New Pass code 0 1 0 0

3. Once the desired passcode is shown, press the MODE button once to highlight ENTER.

ENTER EXIT

New Pass code 0 1 0 0

4. Press the MODE button to enter the new passcode. The PhD Lite will then proceed to the verification screen. The new passcode will have to be reentered.

ENTER

EXIT

Verif y Passcode 0 0 0 0

→↑

ENTER EXIT

New Pass code 0 1 0 0

5. Once the passcode has been re-entered, press the MODE button. ENTER will then be highlighted.

New Pass code 0 1 0 0

6. Press the MODE button again to confirm the new passcode.

ENTER EXIT

ENTER

EXIT

New Pass Code

Saved

Note: Although 0 0 0 0 is a valid initial passcode value, once the passcode has been changed, 0 0 0 0 becomes invalid and may never be used as a passcode again.

3.4.4.3 Span Lock

With the Span Lock feature enabled, the instrument will prompt for the passcode prior to entering the automatic span calibration subroutine.

Note: The passcode feature must be enabled for the Span Lock feature to function. See section 3.4.4.1 for instructions on enabling the passcode feature.

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To enable or disable the span lock feature:

1. Enter the passcode subdirectory of the Options Menu as discussed in section 3.4.4.

CHANGE_PASSCODE

PASSCODE_ON/OFF

SPAN_LOCK

EXIT

2. Use the navigation arrows to highlight SPAN_LOCK and press the MODE button. The up and down navigational arrows are used to toggle between ENABLED and DISABLED.

SPAN-LOCK DISABLED

↓↑

EXIT

SPAN-LOCK ENABLED

3.4.5 Language

The PhD Lite can be set to display messages and readings in a variety of languages. The languages currently available are Portuguese (Portugues), French (Francais), Spanish (Espanol), Danish (Dansk), Italian (Italiano), English, Polish (Polski), Norwegian (Norsk), Dutch (Nederlands), Catalan (Catala), Lithuanian (Lietuviskai), Swedish (Svenska), German (Deutsch), Chinese and Finnish (Suomi).

3.4.5.1 Changing the readout language

1. Enter the Options Menu as discussed in section

3.4.1.

USER_MODE SEC_BEEP PASSCODE DECIMAL T_UNITS

2. From the Options Menu use the navigation arrows to highlight LANGUAGE and press the MODE button.

PORTUGUES FRANCAIS ESPANOL DANSK ITALIANO ENGLISH POLSKI ---Æ

3. Use the navigation arrows to highlight the language that is to be used or press the MODE button with the -Æ highlighted to access more language options.

PORTUGUES FRANCAIS ESPANOL DANSK ITALIANO ENGLISH POLSKI ---Æ

4. Press the MODE button with the appropriate language highlighted to enter the new language setting.

LANGUAGE

EXIT

Francais

YES NO

5. Press the MODE button with YES highlighted to save the new language settings.

Langue

Enregistree

3.4.6 DECIMAL: Changing the precision of the toxic sensor readout

Toxic gas readings may be given in full parts-per-million (PPM) increments, or in tenths of parts-per-million (0.1PPM) increments for some sensors. If the decimal point is enabled, 0.1-PPM increments will be shown during normal operation of the toxic sensor. If the decimal point is disabled readings will be shown in full part-permillion increments.

Note: The decimal point for the CO, CO Plus and the CO side of the Duo-Tox sensor can not be enabled. CO sensor readings are given only in full parts-per-million (PPM).

1. Follow the instructions in section 3.4.1 to reach the Options Menu and use the navigation arrows to highlight DECIMAL.

USER_MODE SEC_BEEP PASSCODE LANGUAGE

DECIMAL

2. Press the MODE button. The following screen will be shown:

T_UNITS EXIT

TOX1 de cimal pt. DISABLED

↑↓

EXIT

TOX1 de cimal pt. ENABLED

Note: If the Duo-Tox sensor is installed, the Tox2 decimal point setting will be shown, which represents the decimal point setting for the H sensor.

3. Once the appropriate decimal point setting is shown, press the MODE button to enter the new settings.

EXIT

Save Ch anges?

YES NO CANCEL

4. Press the MODE button with YES

highlighted to save the new decimal settings.

Decima l Points

Saved

3.4.7 Temperature units: Changing the

Temperature readings may be given in Fahrenheit or Celsius. To change from one temperature scale to the other, do the following:

1. Follow the instructions in 3.4.1 to reach the Options

temperature scale

Menu.

Page 33

USER_MODE SEC_BEEP PASSCODE LANGUAGE DECIMAL

T_UNITS

EXIT

2. Use the navigation arrows to highlight T_UNITS and press the MODE button. The up and down navigation arrows may then be used to toggle between Celsius and Fahrenheit.

TEMPER ATURE UNIT S FAHREN HEIT

EXIT

↑↓

TEMPER ATURE UNIT S CELSIU S

EXIT

3. Once the appropriate setting is shown, press the MODE button to enter the new setting

Save Ch anges?

YES NO CANCEL

4. Press the MODE button with YES highlighted to save the new temperature setting.

3.5 The Screen Menu

The Screen Menu provides access to the PhD Lite’s adjustable contrast and backlight settings.

3.5.1 Entering the Screen Menu

1. Enter the Main Menu as described above in section

3.1.1. Use the navigation arrows to highlight SCREEN.

ALARMS CALIBRATION OPTIONS VIEW TIME

2. Press the MODE button to enter the Screen Menu.

CONTRAST

3.5.2 Adjusting the contrast

To adjust the screen contrast:

EXIT

1. Enter the Screen Menu as described above in section 3.5.1. Use the navigation arrows to highlight CONTRAST.

2. Press the MODE button.

SCREEN

EXIT

BACKLIGHT ORIENTATION

CONTRAST

BACKLIGHT ORIENTATION EXIT

Contra st Adjust ↑ or ↓

3. Adjust the contrast with the up and down navigation arrows. When the contrast reaches the desired

level press the MODE button.

EXIT

Save Ch anges? YES NO CANCEL

4. Press the MODE button with YES highlighted to save the new contrast settings.

3.5.3 Adjusting the backlight

Once the backlight is activated, it will remain on for the length of time specified in the backlight setting. The backlight may also be set to remain on always. To adjust the backlight setting:

1. Enter the Screen Menu as described above in section 3.5.1. Use the navigation arrows to highlight BACKLIGHT.

2. Press the MODE button.

CONTRAST

BACKLIGHT

ORIENTATION EXIT

Backlight

Off after 20s

The PhD Lite’s backlight may be configured to either be “ON Always” or to automatically turn off after an interval of between 5 and 90 seconds.

3.5.3.1 Backlight ON Always

To turn the PhD Lite’s backlight “ON Always” perform the following steps:

1. Follow the instructions above in section 3.5.3 to reach the Backlight settings and use the right navigation arrow to highlight Off.

EXIT

Backlight

Off after 20s

2. The up and down navigation arrows may then be used to toggle between “OFF after” to “ON always.

EXIT

Backlight

Off after 20s

↓↑

EXIT

Backlight

On -always

3. Once the appropriate backlight setting is reached, use the navigation arrows to highlight EXIT and press the MODE button to confirm the new setting.

EXIT

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Backlight

On -always

EXIT

Save Changes?

YES NO CANCEL

4. Press the mode button with YES highlighted to save the new backlight setting.

3.5.3.2 Adjusting the backlight interval

1. Follow the instructions above in section 3.5.3 to reach the backlight settings and use the navigation arrows to highlight the time interval in seconds.

Backlight

Off after 20s

2. The up and down navigation arrows may then be used to adjust the interval to any length of time between 5 and 90 seconds.

EXIT

Backlight

Off after 20s

↑

EXIT

Backlight

Off after 21s

3. Once the appropriate interval is reached, use the navigation arrows to highlight EXIT and press the MODE button to enter the new setting.

EXIT

Save Ch anges?

YES NO CANCEL

4. Press the mode button with YES highlighted to save the new interval setting.

3.5.4 Adjusting the screen orientation

The screen orientation and text properties are controlled though the orientation submenu.

3. Press the MODE button when finished.

Save Ch anges?

YES NO CANCEL

4. Press the mode button with YES highlighted to save the new display setting.

3.5.4.2 Invert text color

The Display may be configured to show in either Standard (white background with black letters) or Inverse (black background with white letters). The Invert text color option is a hidden function that is not shown on the display of the PhD Lite.

O2 LEL CO H2S

20.9 0 0 0

Standard display settings

O2 LEL CO H2S

20.9 0 0 0

Inverse display settings

To change the setting:

1. Enter the Screen Menu as described above in section 3.5.1. Use the navigation arrows to highlight ORIENTATION.

2. Press the MODE button. The “Flip Display” option will be shown.

↑ or ↓ to Flip

Display

3. To invert the text color on the display, press the left or right arrow once.

EXIT

↑ or ↓ to Flip

Display

EXIT

→

3.5.4.1 Flip Display

To rotate the screen orientation 180 degrees:

1. Enter the Screen Menu as described above in section 3.5.1. Use the navigation arrows to highlight ORIENTATION.

CONTRAST

EXIT

BACKLIGHT

ORIENTATION

2. Press the MODE button. Press the up or down arrow to rotate the display.

↑ or ↓ to Flip

Display

↑↓

EXIT

↑ or ↓ to Flip

Display

3. Press the MODE button when finished.

EXIT

Save Ch anges?

YES NO CANCEL

4. Press the mode button with YES highlighted to save the new display setting.

3.6 The View Menu

Information pertaining to alarm levels, current battery voltage, service dates and software versions may be viewed, but not altered through the View Menu.

Page 35

3.6.1 Entering the View Menu

1. Enter the Main Menu as described above in section

3.1.1. Use the navigation arrows to highlight VIEW.

2. Press the MODE button to enter the View Menu.

3.6.2 View alarm levels

ALARMS CALIBRATION OPTIONS SCREEN

VIEW

DISPLAY

ALARM_LEVELS BAT_VOLTAGE SERVICE VERSION

TIME EXIT

EXIT

1. Enter the View Menu as discussed above in section

3.6.1. Use the navigation arrows to highlight ALARM_LEVELS.

ALARM_LEVELS

BAT_VOLTAGE SERVICE VERSION EXIT

2. Press the MODE button. The current alarm settings will then be shown.

CURREN T ALARM

LEVELS

LOW ALAR M LEVEL O2 = 18.0 %

3. The right and left navigation arrows may then be used to scroll through the various alarm settings.

EXIT

LOW ALAR M LEVEL O2 = 18.0 %

→

EXIT

HIGH AL ARM LEVEL O2 = 23.5 %

→

EXIT

HIGH AL ARM LEVEL LEL = 10 %

4. Press the MODE button at any time to return to the Main Menu.

3.6.3 View battery voltage

1. Enter the View Menu as discussed above in section

3.6.1. Use the navigation arrows to highlight BAT_VOLTAGE.

ALARM_LEVELS

BAT_VOLTAGE

SERVICE VERSION EXIT

2. Press the MODE button. The battery voltage screen will be shown.

EXIT

Batter y Voltage

3.6 Volts

EXIT

3. Press the MODE button to return to the Main Menu.

3.6.4 View service information

1. Enter the View Menu as discussed above in section

3.6.1. Use the navigation arrows to highlight SERVICE.

ALARM_LEVELS BAT_VOLTAGE

SERVICE

VERSION EXIT

2. Press the MODE button. The service information screen will be shown.

For Serv ice Call 860-344-1079

3. Press the MODE button to return to the Main Menu.

3.6.5 View Software Version

The Version subdirectory of the View Menu contains information on the current software version, current OTP version and the date of the last update.

1. Enter the View Menu as discussed above in section

3.6.1. Use the navigation arrows to highlight VERSION.

2. Press the MODE button. The software version will then be shown. Use the right and left navigation arrows to scroll through the three available screens.

ALARM_LEVELS BAT_VOLTAGE SERVICE

VERSION

EXIT

biosystems

PhD Lite V.3.18

→

biosystems

OTP V01.10

→

2003/09/ 08 14:14:34

3. Press the MODE button to return to the Main Menu.

3.7 The Time Menu

For PhD Lite instruments that do not include the datalogger upgrade, the Time Menu provides access to date and time-related functions.

Note: PhD Lite instruments with instrument firmware earlier than version 1.29 may not include the Time menu option.

Note: If your PhD Lite shows DATALOGGER in place of TIME in the Options Menu, proceed to Chapter 5.

3.7.1 Entering the Time Menu

1. Enter the Main Menu as described above in section

3.1.1. Use the navigation arrows to highlight TIME.

Page 36

ALARMS CALIBRATION OPTIONS SCREEN VIEW

2. Press the MODE button to enter the Time Menu.

3.7.2 Time and date settings

To change the time and date:

TIME

EXIT

TIME/DATE SERV_DATE

EXIT

1. Enter the Time Menu as described above in section

3.7.1. Use the navigation arrows to highlight TIME/DATE.

2. Press the MODE button.

TIME/DATE

SERV_DATE EXIT

Date 23 SEP 20 03 Time 14:10

3. The right and left navigation arrows are used to move back and forth between the day, month, year, hour and minute settings and the EXIT option. Once the time setting that needs to be adjusted is highlighted, the up and down navigation arrows are used to make the adjustment.

EXIT

Date 23 SEP 20 03 Time 11:10

→↑

EXIT

Date 18 OCT 20 03 Time 11:10

4. The MODE button may be pressed at any time to enter the new settings.

EXIT

Save Ch anges?

YES NO CANCEL

5. Press the MODE button with YES highlighted to confirm the new time and date settings.

3.7.3 Service date settings

The PhD Lite can be programmed to automatically remind the user to service the sensors in the unit. To reach the service due date settings for the individual sensors:

1. Enter the Time Menu as described above in section

3.7.1. Use the navigation arrows to highlight SERV_DATE.

2. Press the MODE button. The following screen will then be shown.

TIME/DATE

SERV_DATE

EXIT

CHANGE_SERV_DATE SERVICE_ON/OFF

EXIT

3.7.3.1 Enable/Disable sensor service due dates

1. Enter the service date subdirectory of the Time Menu as described above. Use the up navigation arrow to highlight SERVICE_ON/OFF.

CHANGE_SERV_DATE

SERVICE_ON/OFF

EXIT

2. Press the MODE button. The following screens will then be shown in succession.

SENSOR SERVICE EXPIRATION ALARMS

O2 SERVIC E ALARM DISABLED

3. Use the right and left navigation arrows to scroll through the service setting date for each sensor.

EXIT

O2 SERVIC E ALARM DISABLED

→

EXIT

LEL SERV ICE ALARM DISABLED

4. Once the appropriate sensor is reached, use the up and down navigation arrows to change the setting.

EXIT

LEL SERV ICE ALARM DISABLED

↓↑

EXIT

LEL SERV ICE ALARM ENABLED

5. Once the appropriate sensor due date settings are shown, press the MODE button to enter the settings.

EXIT

Save Ch anges?

YES NO CANCEL

6. Press the MODE button with YES highlighted to confirm the new sensor service due dates.

3.7.3.2 Change sensor service due date settings

1. Enter the service date subdirectory of the Time Menu as described above. Use the up navigation arrow to highlight CHANGE_SERVICE_DATE.

CHANGE_SERV_DATE

SERVICE_ON/OFF EXIT

Page 37

2. Press the MODE button. The following screen will then be shown in succession.

SENSOR SERVICE EXPIRATION DATES

NEXT O2 SERVIC E 28 OCT 2003

EXIT

3. To advance to another sensor, press the MODE button with NEXT highlighted.

NEXT O2 SERVIC E 28 OCT 2003

EXIT

NEXT LE L SERVICE 28 OCT 2003

4. Once the appropriate sensor is reached, use the right and left navigation arrows to highlight the day, month or year that requires adjustment.

NEXT LE L SERVICE 28 OCT 2003

←←

EXIT

NEXT LE L SERVICE 28 OCT 2003

5. Use the up and down navigation arrows to change the setting.

NEXT EXIT

NEXT LE L SERVICE 28 OCT 2003

↑

NEXT EXIT

NEXT LE L SERVICE 28 NOV 2003

6. Once the sensor service dates have been changed use the right and left navigation arrows to highlight EXIT.

NEXT EXIT

NEXT LE L SERVICE 28 NOV 2003

7. Press the MODE button to enter the new service dates.

EXIT

Save Ch anges?

YES NO CANCEL

8. Press the MODE button with YES highlighted to confirm the new sensor service due dates.

Page 38

Chapter 4. Calibration

The PhD Lite multi-gas detector has been designed for easy calibration. A single control, the on/off MODE button, can be used to initiate the automatic calibration sequence and to automatically make calibration adjustments.

Manual and single-sensor calibration procedures can also be initiated by using the navigation arrows located on the instrument.

Note: If a sensor has just been replaced, it must be allowed to stabilize prior to initiating any of the calibration subroutines detailed below. See section

6.1.1 for further details concerning sensor

stabilization requirements. The PhD Lite’s automatic calibration features are

described in section 4.4 below. The PhD Lite’s manual calibration features are

described in section 4.5 below.

4.1 Verification of accuracy

Verification of accuracy is a two step procedure.

Step one is to take the PhD Lite to an area where the atmosphere is known to be fresh and check the readings. If the readings differ from those expected in fresh air, then a fresh air calibration adjustment must be made.

Step two is to make sure the sensors are accurate by exposing them to a test gas of known concentration and noting the sensor response. This procedure is known as a functional (bump) test and is covered in section

4.6. Oxygen readings are considered to be accurate

when the display is within 0.5%/volume of the expected concentration as given on the calibration gas cylinder. LEL and toxic readings are considered accurate when they are between 90%* and 120% of the expected value as given on the calibration gas cylinder. If readings are accurate, there is no need to adjust your gas detector. If the readings are inaccurate, the instrument must be span calibrated before further use.

* * The Canadian Standards Association (CSA) requires the instrument to undergo calibration when the displayed value during a bump test fails to fall between 100% and 120% of the expected value for the gas.

Always check the expiration

date on calibration gas cylinder(s) prior to use. Expired calibration gas can lead to inaccurate and potentially dangerous readings.

Biosystems offers calibration kits and long lasting cylinders of test gas specifically developed for easy PhD Lite calibration.

Use of non-standard calibration gas and/or calibration kit components when calibrating the PhD Lite can lead to inaccurate and potentially dangerous readings, and may void the standard Biosystems warranty.

Customers are strongly urged to use only Biosystems calibration materials when calibrating the PhD Lite.

4.2 Effect of contaminants on PhD Lite sensors

The atmosphere in which the PhD Lite is used can have lasting effects on the sensors. Sensors may suffer losses in sensitivity leading to degraded performance if exposed to certain substances.

There are three basic types of sensors that may be installed in the PhD Lite: galvanic oxygen, catalytic hotbead combustible gas, and electrochemical toxic. Each type of sensor uses a slightly different detection principle, so the kinds of conditions that affect the accuracy of the sensors vary from one type of sensor to the next.

4.2.1 Effects of contaminants on oxygen sensors

Oxygen sensors may be affected by prolonged exposure to "acid" gases such as carbon dioxide. The oxygen sensors used in Biosystems instruments are not recommended for continuous use in atmospheres containing more than 25% CO

See Appendix B for cross-sensitivity data for the sensors used in the PhD Lite.

4.2.2 Effects of contaminants on combustible

sensors

Combustible sensors will be adversely affected by exposure to substances containing volatile silicone, which is found in many commercial formulations such as spray lubricants, plastic mold(ing) release agents, waterproofing agents, heat transfer fluids, and is released during the cure of silicone-based caulks and rubbers (RTV). Other combustible gas sensor poisons and inhibitors include, but are not limited to: tetraethyl lead as in "leaded" gasoline grades (aviation "low-lead" fuel), halogenated hydrocarbons such as Freons

, other such refrigerants and solvents such as 1,1,1trichloroethane, perchloroethylene and methylene chloride. Chronic exposures to high concentrations (above human health and safety levels) of hydrogen sulfide (H combustible sensor performance.

S) and Phosphine (PH3) can also impair

Note: Damage to combustible gas sensors incurred by exposure to known sensor poisons such as silicones, tetra-ethyl lead, and/or other substances may (at the discretion of Biosystems’ Instrument Service Department) void Biosystems’ Standard Warranty as it applies to the replacement of

Page 39

combustible gas sensors. For a more complete list of known sensor poisons see Biosystems Standard Warranty in Appendix E.

After any detector exposure to a suspected or known poison/inhibitor source, combustible sensor accuracy should be verified immediately by exposure to calibration gas of known percent LEL concentration.

Note: If the combustible sensor in the PhD Lite suffers a loss of sensitivity, it tends to be lost first with regards to methane.

As described above, combustible gas sensors may become desensitized if exposed to certain substances. In some cases a desensitized combustible sensor may still respond accurately to propane and other hydrocarbons while showing a dangerously reduced response to methane.

Biosystems’ “Propane Equivalent” calibration gas mixtures have been developed to eliminate this potentially dangerous source of calibration error. Biosystems’ “Propane Equivalent” mixtures are based on methane, so any loss of sensitivity to methane is detected (and can be corrected) immediately.

Using Biosystems brand calibration gas and regularly verifying accuracy ensures that proper sensi tivity is main ta in ed for the life of the se nsor .

4.2.3 Effe cts of high concentrations of combustible gas on the combustible sensor

The accuracy of combustible sensors may also be affected by exposure to high concentrations of combustible gas. To minimize the chance for damage or loss of sensitivity to the combustible sensor, the PhD Lite is designed to "alarm latch" whenever the concentration of combustible gas exceeds 100 percent LEL. Under these conditions an “X” will appear in place of the combustible gas reading to indicate that an overlimit condition has occurred, and “LEL OVERRANGE” will be displayed at the bottom of the LCD.

During an “LEL OVERRRANGE” condition, the power to the LEL sensor is interrupted and the audible and visible alarms are activated until the instrument is manually reset by turning it off.

A combustible sensor

overrange alarm indicates a potentially explosive atmosphere. Failure to leave the area immediately may result in serious injury or death!

In the event of a combustible sensor overrange alarm, the PhD Lite must be turned off, brought to an area that is known to be safe and then turned on again to reset the alarm.

Make sure that the PhD Lite is located in fresh air before turning the instrument back on after a combustible sensor alarm latch condition has occurred. Fresh air calibration adjustments may only be made w hen the PhD Lite is locate d in air th at is kn o wn to be fr esh. After a combustible sensor alarm-latch condition occurs, the accuracy of the combustible gas sensor must be

verified by exposure to known percentage LEL concentration test gas before further use.

Note: The combustible sensor used in the PhD Lite requires a minimum of 10% oxygen by volume in order to generate accurate combustible gas readings. Combustible sensor accuracy may be diminished if the instrument is used in oxygendeficient atmospheres.

A rapid up-scale reading followed by a declining or erratic reading may indicate a hazardous combustible gas concentration that exceeds the PhD Lite’s zero to 100 percent LEL detection range. Failure to leave the area immediately may result in serious injury or death!

4.2.4 Effects of contaminants on toxic gas

sensors

Biosystems “substance-specific” electrochemical “smart sensors” used to measure many toxic gases have been carefully designed to minimize the effects of common interfering gases. “Substance-specific” sensors are designed to respond only to the gases that they are supposed to measure. The higher the specificity of the sensor, the less likely the sensor will react to other gases, which may be incidentally present in the environment. For instance, a “substance-specific” carbon monoxide sensor is deliberately designed not to respond to other gases that may be present at the same time, such as hydrogen sulfide and methane.

Although great care has been taken to reduce crosssensitivity, some interfering gases may still have an effect on toxic sensor readings. In some cases the interfering effect may be positive and result in readings that are higher than actual. In other cases the interference may be negative and produce readings that are lower than actual or even result in negative gas readings.

4.3 Single sensors capable of monitoring for two different gases

The OSHA standard for permit-required confined space entry (29 CFR 1910.146) explicitly requires the use of a direct-reading, substance-specific sensor whenever a particular toxic hazard is likely to be present. For exam ple, if hydrogen sulfide is likely to be present, one of the toxic sensors selected should be specifically designed for the direct detection of H

Page 40

4.3.1 Using one sensor to monitor for Carbon Monoxide and Hydrogen Sulfide

Carbon monoxide and hydrogen sulfide are the two most common toxic gases associated with confined space entry. Biosystems offers two different sensors, the Duo-Tox and the CO Plus, which allow the user to monitor for both of these hazards while utilizing only one sensor port.

4.3.1.1 Biosystems Duo-Tox dual purpose Carbon

Monoxide/Hydrogen Sulfide sensor

The Duo-Tox sensor is a substance-specific, dualchannel, electrochemical sensor designed to directly detect both carbon monoxide and hydrogen sulfide without cross interference. When the Duo-Tox sensor is installed in the PhD Lite, it provides two independent channels of monitoring information while using only one sensor port. This allows the instrument to provide four channels of detection with only three sensors installed. A PhD Lite equipped with a Duo-Tox sensor will show both CO and H

S on the current gas readings screen.

O2 LEL CO H2S

20.9 0 0 0

Current gas readings screen with O2, LEL and Duo-Tox sensor installed.

Calibration gas containing known concentrations of both CO and H Tox sensor.

S must be used to properly calibrate the Duo-

4.3.1.2 Biosystems “CO Plus” dual purpose carbon

monoxide/hydrogen sulfide sensor

The “CO Plus” sensor is ideal for situations requiring the use of a single sensor to monitor simultaneously for both CO and H

S, in which the user does not need to

definitively know which hazard is being encountered. While the “CO Plus” sensor will simultaneously detect both carbon monoxide and hydrogen sulfide, it is only possible to directly monitor for one of these hazards.

The PhD Lite offers a choice of two different calibration gas settings for the CO Plus sensor. Calibration gas setting determines whether the PhD Lite is configured for the direct detection of CO or H

S. When the

calibration gas value is set to CO, the PhD Lite will show CO+ on the current gas readings screen. Alternately, when the calibration gas value is set to H Lite will show H

S+ on the current gas readings screen.

S, the PhD

O2 LEL CO+

20.9 0 0

Current gas re adings screens with CO Plus sensor; calibration gas value set to CO.

O2 LEL H2S+

20.9 0 0

Current gas re adings screens with CO Plus sensor; calibration gas value set to H

Note: The procedure for changing the calibration gas value setting for the CO Plus sensor is covered below in section 4.7.2.2.

4.3.1.2.1 Relative response of the CO Plus sensor to carbon monoxide and hydrogen sulfide

The “CO Plus” sensor will accurately and directly measure the gas type to which it has been successfully calibrated. OSHA has assigned an 8-hour TWA of 35 PPM as the permissible exposure limit for carbon monoxide. If the “CO Plus” sensor is successfully calibrated to carbon monoxide, and then exposed to 35 PPM carbon monoxide, the display will show 35 PPM.

Appendix A discusses Permissible Exposure Limit alarm calculations in greater detail.

Regardless of the calibration gas selection, the “CO Plus” sensor will also show a “relative response” to other interfering gases. When calibrated with carbon monoxide, the “CO Plus” sensor responds to hydrogen sulfide in a ratio of about 3.5 to 1.0. This means a concentration of about 10 PPM hydrogen sulfide would produce a reading of 10 X 3.5 or 35 PPM in an instrum ent that has been calibrated to CO.

This is a very convenient relative response. The 8-hour TWA permissible exposure limit for hydrogen sulfide is 10 PPM. This means that even when configured for the direct reading of CO, the CO Plus gas alarms will be activated any time the concentration of hydrogen sulfide exceeds the permissible exposure limit.

Note: The procedure for changing the calibration gas value setting for the CO Plus sensor is covered below in section 4.7.2.2.

4.3.2 Cl2 and ClO2 Non-Specific sensors

Four different sensors are currently available for the PhD Lite for the detection of chlorine (Cl dioxide (ClO

(part numbers 54-25-08 and 54-25-12) have built-

ClO

in cross-sensitivity as follows:

4.3.2.1 Cl2 Non-Specific

). The non-specific versions of the Cl2 and

) and chlorine

The 54-25-08 Cl2 non-specific sensor is cross sensitive

at a rate of 3.1 to 1. This means that when a

to ClO

properly calibrated PhD Lite with a Cl sensor encounters 1PPM ClO a reading of 3.1PPM Cl

4.3.2.2 ClO2 Non-Specific

non-specific

, it will respond by giving

The 54-25-12 ClO2 non-specific sensor is cross sensitive to Cl when a properly calibrated PhD Lite with a ClO specific sensor encounters 1PPM Cl giving a reading of approximately 0.3PPM ClO

at a rate of 1 to 3.1. This means that

, it will respond by

non-

Note: For more information on cross sensitivity for any of the sensors available in the PhD Lite, see Appendix B.

Page 41

4.4 Automatic calibration

Biosystems one-button auto-calibration procedure may be used to calibrate the PhD Lite at any time during normal operation in all modes except Text-Only Mode.

Auto-calibration is a two-step procedure. In the first step the PhD Lite is taken to an area where the atmosphere is known to be fresh and a fresh air adjustment is made as detailed below.

The second step is the sensor response or "span" calibration adjustment. In this step the accuracy of the PhD Lite sensors is established by exposing them to known concentration calibration gas(es). The sensitivity or “span” is automatically adjusted by the instrument.

Note: If the Passcode and Span Lock functions are enabled, the PhD Lite will prompt the user for the passcode prior to entering the span calibration subroutine. See section 3.4.4.3 for further details.

4.4.1 Automatic fresh air/zero calibration sequence

The automatic fresh air calibration procedure may only be performed while the instrument is being operated in Technician, Basic/Peak or Basic operating modes.

1. Turn the instrument on and make sure gas readings are given in numbers. (This is an indication that the PhD Lite is currently in Basic, Basic/Peak or Technician Mode).

If sensor readings are displayed in the form of “OK” text messages, the instrument is currently in TextOnly mode. It will be necessary to change the operating mode to Basic, Basic/Peak or Technician mode as explained in section 2.3.5 before proceeding with the calibration.

2. Wait at least three minutes after turning the instrument on to allow sensor readings to stabilize fully before initiating any calibration procedures. If a sensor has just been replaced, follow the sensor stabilization schedule in section 6.1.1.

3. Make sure the instrument is located in an area where the air is known to be fresh.

4. Press the MODE button three times within two seconds. This will "wake up" the instrument from normal operation, and initiate the auto-calibration sequence. A screen will briefly display the message “One Button Auto-Calibration”.

One Butt on Auto

Calibration

The instrument will then proceed to the following screen and begin a 5-second countdown.

Zero Ca libration Mode = Ad just 5

5. To initiate the fresh air/zero calibration, press the MODE button before the unit finishes the countdown.

Zero Ca libration

Please Wait

Zero Ca libration

Completed

Upon successful completion of the fresh air/zero calibration, the instrument will automatically proceed to the automatic span calibration sequence.

4.4.1.1 Reading “Too High” or “Too Low” for zero adjust

To reduce the chances of the PhD Lite being inadvertently fresh air/zero calibrated in contaminated air, only small adjustments are allowed in the automatic fresh air/zero calibration sequence. If the necessary adjustm ents are too large, the display will indicate the sensor (or sensors) affected, and a message screen will indicate that the reading is “Too Low” or “Too High” for zero adjustment. In this case the instrument must be fresh air calibrated using the manual calibration procedures as discussed in section 4.5.1 of this manual.

Oxygen Too Low

for Zero Cal

Once the instrument has been successfully fresh air calibrated using the manual fresh air calibration procedure, subsequent calibration adjustments may be made using the MODE button and automatic calibration logic discussed in this section.

4.4.2 Automatic span calibration sequence

Following the completion of the automatic fresh air calibration, the PhD Lite will display the countdown for the automatic span calibration:

Span Ca libration Mode = Ad just 5

If span calibration is not required, allow the unit to complete the 5-second countdown without pressing any buttons.

Press MODE before the before the end of the 5-second countdown to initiate the automatic span calibration sequence. The PhD Lite will then display:

Apply Ga s

MODE = Ca ncel

Attach the cylinder of calibration gas to the PhD Lite through the regulator, tubing and calibration adapter as shown below in figure 4.4.2. Continue to flow gas throughout the span calibration procedure.

Note: The PhD Lite requires a fixed flow rate of 1.0 liter/minute for all calibration procedures.

Page 42

Figure 4.4 . 2 T y p ical cal i bration set - up .

The PhD Lite automatically recognizes the type of gas supplied and displays the current reading for each sensor that may be calibrated using the current gas mixture. The span adjustm ent process from this point on is automatic and requires no user input.

Please Wait

If multi-component calibration gas is being used, the following sequence will be shown.

Multi Ca l Gas

Detected

LEL Sensor Reading 48

Once the readings stabilize, the PhD Lite will automatically adjust itself so that the sensor readings match the expected gas concentration values as they appear in the gas values subdirectory of the calibration menu.

LEL Set to 50

MAX ADJUSTMENT 171

Note: The max adjustment value shown is an indication of the relative health of the sensor. As a sensor loses sensitivity, the maximum adjustment level will approach the calibration gas concentration.

Once the LEL sensor is adjusted, the instrument will move on to the next sensor and perform a similar adjustment.

CO Sensor Reading 52

CO Set to 50

MAX ADJUSTMENT 181

Once the span-calibration is successfully completed, the instrument will show the following screen prior to turning itself off.

Auto Ca libration

Completed

Begin Sh ut Down

Please Wait

After shut down, remove all gas fittings from the PhD Lite, and disconnect the regulator from the calibration gas cylinder. Then press the MODE button to turn the instrument on and resume normal operation.

Note: If the MODE button is pressed at any time prior to c ompletion of the calibra tion, th e c a libra t io n procedur e will be cancelled an d the in strument will return to no rmal ope ra tion.

Wait at least 3 minutes after turning the instrument on to allow sensor readings to stabilize fully before initiating any calibration procedures. Failure to wait three minutes before initiating calibration procedures may lead to inaccurate and potentially dangerous readings.

Make sure the regulator, cylinder seating surfaces and threads are clean and dry before attaching the regulator to the cylinder of gas. Introduction of contaminants through the regulator fittings may alter or degrade the concentration of the gas contained in the cylinder and may lead to inaccurate and potentially dangerous gas readings.

CAUTION: The use of regulators with on/off

valves may introduce contaminants into the gas cylinder and may lead to the breakdown of reactive gases prior to the cylinder expiration date. Biosystems strongly recommends the use of continuous fixed-flow regulators for all calibration procedures.

gas and/or calibration kit components when calibrating the PhD Lite may lead to dangerously inaccurate readings and may void the standard Biosystems warranty.

4.4.3 Automatic span calibration with more than

one gas cylinder

Depending on the sensor configuration of the PhD Lite, it may be necessary to use more than one cylinder of calibration gas to complete the calibration.

The PhD Lite will automatically recognize the type of gas that is applied and proceed with the span calibration of the sensor(s) that react to the gas. Once that/those sensor(s) have been successfully calibrated, the PhD

Use of non-standard calibration

Apply Ga s

MODE = Ca ncel

Page 43

Lite will automatically request the calibration gas for the next sensor to be calibrated.

Note: If multiple cylinders of calibration gas are used during calibration, it will be necessary to change cylinders between span adjustments. In this case the display will indicate the type and concentration of the next cylinder of calibration gas to be applied.

Apply 10PPM SO2

Once the instrument detects the proper gas, the instrum ent will proceed to automatically calibrate the sensor channel.

SO2 Sensor Reading 10

When all sensors currently recognized have been successfully span-calibrated, the instrument will display “Auto Calibration Completed” and proceed to shut itself off.

Note: It is possible to exit the automatic span calibration sequence at any time prior to completion by pressing and holding down the MODE button to turn the instrument off. The instrument will retain the updated settings for those sensors whose span adjustments have been successfully completed. Sensors that were not successfully adjusted at the time the auto-calibration sequence was terminated will trigger a “Needs Cal” message at the time the instrument is next turned on. The accuracy of those remaining sensors should be verified by exposure to known concentration test gas before the instrument is put back into service.

4.5 Manual calibration

It is possible to calibrate the PhD Lite manually by using the navigation arrows to enter the Calibration Menu and to then select the desired calibration procedure.

4.5.1 Manual fresh air calibration procedure

In some cases, it will be necessary to manually fresh air calibrate the PhD Lite. Manual fresh air calibrations are performed as follows:

1. Turn the instrument on and wait at least three minutes to allow sensor readings to stabilize fully before initiating any calibration procedures.

2. Make sure the instrument is located in an area where the air is known to be fresh.

3. Enter the Main Menu as described in section 3.1 above.

ALARMS OPTIONS SCREEN VIEW TIME

CALIBRATION

EXIT

4. Use the navigation arrows to select CALIBRATION and then press the MODE button.

FRESH_AIR

SPAN_CAL HISTORY GAS_VALUES LAST_CAL IQ LINK EXIT

REMIND

5. Use the navigation arrows to highlight FRESH_AIR and press the MODE button.

Do Zero Ca l Now?

YES NO

6. Press the MODE button with YES highlighted to initiate the zero calibration.

Zero Ca libration

Please Wait

Zero Ca libration

Completed

7. After the completion of the fresh air calibration the PhD Lite will automatically return to the Main Menu.

ALARMS CALIBRATION OPTIONS SCREEN VIEW TIME

EXIT

8. Press the MODE button with EXIT highlighted to return to the current gas readings screen.

4.5.1.1 Shortcuts to the manual fresh air

calibration procedures

There are two additional ways to reach the manual fresh air calibration procedure detailed above.

4.5.1.1.1 Shortcut to fresh air calibration while in

normal operation

At the current gas readings screen in Basic, Basic/Peak or Technician mode, press and hold the left navigation arrow for six seconds until the PhD Lite instructs you to release it.

Releas e Button

Do Zero Ca l Now?

YES NO

The instrument will then proceed directly to the manual fresh air calibration detailed above in section 4.5.1.

Note: If no action is taken within fifteen seconds of entering the “Do Zero Cal Now?” screen, the instrument will automatically return to the current gas readings screen.

Page 44

4.5.1.1.2 S h o r tc ut to Ma in Menu while turning the PhD Lite on

Turn on the PhD Lite while holding down the left navigation arrow. After the initial start up sequence the Main Menu screen will be displayed.

Entering

Main Menu

To enter the fresh air calibration from the Main Menu, follow the directions above in section 4.5.1 starting at step 3.

4.5.2 Manual span calibration procedures

Manual span calibration procedures are useful when the calibration of a single sensor is required or when nonstandard calibration gas is being used. Manual span calibrations are performed as follows:

1. Turn the instrument on.

3. Enter the Main Menu as described above in section

3.1. Use the navigation arrows to highlight CALIBRATION.

ALARMS OPTIONS SCREEN VIEW TIME

CALIBRATION

EXIT

4. Press the MODE button. The calibration menu will then be displayed

FRESH_AIR REMIND

SPAN_CAL

GAS_VALUES LAST_CAL IQ LINK EXIT

HISTORY

5. Use the navigation arrows to highlight SPAN CAL and press the MODE button.

Span-Cal LEL = 0%

6. Use the right and left navigation arrows to scroll through the available sensors until the sensor that requires calibration is displayed.

EXIT

Span-Cal LEL = 0%

→

EXIT

Span-Cal CO = 0

7. Once the sensor is reached, apply the calibration gas as shown above in figure 4.4.2. The reading shown on the display should respond quickly.

date on calibration gas cylinder(s) prior to use.

Always check the expiration

EXIT

Expired calibration gas can lead to inaccurate and potentially dangerous readings.

Span-Cal CO = 48

8. Once the readings stabilize, use the up and down navigation arrows to raise or lower the readings to match the level of the gas concentration printed on the calibration cylinder label.

EXIT

Span-Cal CO = 52

↓↓

EXIT

Span-Cal CO = 50

9. When the span calibration for a particular sensor is completed, use the right and left navigation arrows to advance to the next sensor channel to be span adjusted.

10. When finished, press the MODE button to exit.

EXIT

Save Ch anges?

YES NO CANCEL

11. Press the MODE button with YES highlighted to save the span calibration.

12. Remove all gas fittings from the PhD Lite, and disconnect the regulator from the calibration gas cylinder.

Note: If multiple cylinders of calibration gas are necessary to complete the manual span calibration, each calibration must be completed and independently saved prior to changing cylinders.

4.6 Functional (bump) test

The accuracy of the PhD Lite may be verified at any time by a simple functional (bump) test.

To perform a functional (bump) test, do the following:

1. Turn the PhD Lite on and wait at least three minutes to allow the readings to fully stabilize.

2. Make sure the instrument is located in fresh air.

3. Verify that the current gas readings match the concentrations present in fresh air. If the PhD Lite is operating in Basic, Basic/Peak or Technician operating mode the fresh air readings should equal

20.9 % O any toxic sensors installed. If the instrument is operated in the Text Only mode all readings should indicate that conditions are “OK”. If necessary, fresh air calibrate the instrument using the procedures discussed in section 4.5.1 above.

4. Apply the calibration gas as shown above in figure

4.4.2.

5. Wait for the readings to stabilize. (Forty-five seconds to one minute is usually sufficient. Reactive gas sensors may take longer.)

, 0 % LEL or 0.0 % CH4, and 0 PPM for

Page 45

6. Note the readings. Oxygen readings are considered accurate when the display is within ±0.5%/volume of the expected concentration as given on the calibration gas cylinder. LEL and toxic readings are considered accurate when they are between 90%* and 120% of the expected value as given on the calibration gas cylinder.

* The Canadian Standards Association (CSA) requires the instrument to undergo calibration when the displayed value during a bump test fails to fall between 100% and 120% of the expected value for the gas.

Note: If gas concentration readings are off by more than 10 percent higher or lower than the expected values during a functional (bump) test, the instrument must be adjusted using the "span" calibration procedures discussed in section 4.5.2 before further use.

Always check the expiration

date on calibration gas cylinder(s) prior to use. Expired calibration gas can lead to inaccurate and potentially dangerous readings.

4.7 The Calibration Menu

The Calibration Menu is an immediate subdirectory of the Main Menu and provides access to all calibration functions and controls.

4.7.1 Entering the Calibration Menu

To enter the Calibration Menu:

1. Turn the instrument on and wait until gas readings appear.

2. Press the MODE button until the information screen is displayed.

01:15 15:08

3.9V 71F

3. At the INFORMATION screen hold down the left navigation arrow for 3 seconds or until EXIT appears and is highlighted.

01:15 15:08

3.9V 71F

4. Press the down navigation arrow once to highlight MENU and press the MODE button. The Main Menu will then be displayed.

ALARMS CALIBRATION OPTIONS SCREEN VIEW TIME

5. Use the navigation arrows to highlight CALIBRATION and press the MODE button. The calibration menu will then be displayed.

EXIT

FRESH_AIR SPAN_CAL GAS_VALUES REMIND IQ LINK CAL LOCK

EXIT

4.7.2 Gas values

Calibration gas concentration values may be viewed and adjusted through the gas values screen.

To change calibration gas values:

1. Enter the Calibration Menu as described above in section 4.7.1.

FRESH_AIR SPAN_CAL

GAS_VALUES

IQ LINK EXIT CAL LOCK

REMIND

2. Use the navigation arrows to highlight GAS VALUES and press the MODE button.

CALIBR ATION GAS LEL 50.0%

EXIT

Calibration values shown in the calibration value table must match those appearing on the calibration gas cylinder(s) that will be used to calibrate the PhD Lite. Non-matching calibration gas and calibration gas value settings will lead to inaccurate and potentially dangerous readings.

3. Use the right and left navigation arrows to scroll

through the available calibration gas settings.

CALIBR ATION GAS LEL 50.0%

EXIT

→

CALIBR ATION GAS CO 50.0ppm

4. Once the appropriate sensor is reached, use the up

and down navigation arrows to modify the gas setting.

CALIBR ATION GAS CO 50.0ppm

↓

EXIT

CALIBR ATION GAS CO 49.9ppm

5. Once the concentration matches the value listed on

the calibration gas cylinder(s), press the MODE button.

EXIT

Save Ch anges?

YES NO CANCEL

6. Press the MODE button with YES highlighted to

save the new settings.

Cal Gas Va lues

Saved

4.7.2.1 Changing the combustible gas readout fr om LEL t o CH

The PhD Lite may be configured to show combustible gas readings in terms of percent of LEL (Lower

Page 46

Explosive Limit) or in terms of the percent by volume of methane (CH

With the PhD Lite configured to read in terms of percent by volume of methane (CH

), the LEL sensor must be

calibrated to the actual percent by volume of methane used in Biosystems calibration gas cylinders, not to the %LEL value given on the label. The actual percentage by volume of CH

will be stamped in indelible black ink

on the side of the cylinder body. For example, Biosystems popular all-in-one mix, part number 549044E, with 50% LEL propane equivalent will list ±1.62% CH case, the percent by volume CH should be set to 1.62%.

on the side of the cylinder body. In this

calibration gas value

For easy reference, the actual percent by volume of CH4 for the following Biosystems LEL component mixtures is listed in the following table.

LEL Component Description

50% LEL Methane 50% LEL Propane

Volume % Methane ( CH

±2.50 ±1.62

)

Equivalent 50% LEL Pentane

±1.25

Equivalent

Table 4.7. 2 .1 P erc en t LE L v er su s percent by vo l ume of methane for comm on Bi osys te ms c alibr ati on ga s cylinders.

To change the calibration gas value setting from percentage of LEL to percent by volume of methane or vice versa:

1. Enter the Calibration Menu as described above in section 4.7.1.

FRESH_AIR SPAN_CAL

GAS_VALUES

IQ LINK EXIT CAL LOCK

REMIND

2. Use the navigation arrows to highlight GAS VALUES and press the MODE button.

Depending on the existing calibration gas value setting, the instrument will display the calibration value either as percentage of LEL or as percent by volume of methane

(CH

CALIBR ATION GAS LEL 50.0%

EXIT

CALIBR ATION GAS CH4 2.50%

EXIT

3. Press the left navigation arrow once to highlight LEL

or CH

CALIBR ATION GAS

LEL 50.0%

CALIBR ATION GAS

CH4 2.50%

EXIT

4. The up and down navigation arrows may be used to toggle between the calibration gas settings (LEL or

). Once the appropriate setting is shown, press

the right navigation arrow once to highlight the calibration gas concentration in percent of LEL or percent by volume (CH

). To change the calibration

gas concentration setting, use the up and down navigation arrows to increase or decrease the amount.

CALIBR ATION GAS CH4 2.50%

↓

CALIBR ATION GAS CH4 2.49%

5. Once the appropriate calibration gas type and concentration are reached, press the MODE button to confirm the setting.

EXIT

Save Ch anges?

YES NO CANCEL

6. Press the MODE button with YES highlighted to save the new settings.

Cal Gas Va lues

Saved

4.7.2.2 Changing the direct reading setting of the

CO Plus sensor from CO to H

Biosystems CO Plus sensor is designed for the simultaneous detection of both carbon monoxide and hydrogen sulfide, but it can only be calibrated for the direct detection of one of these hazards.

For instruments with the CO Plus sensor, calibration gas settings determine whether the PhD Lite is configured for the direct detection of CO or H

S. When the

calibration gas selected is CO, the PhD Lite will show CO+ on the current gas readings screen. Alternately, when the calibration gas selected is H will show H

S+ on the current gas readings screen.

S, the PhD Lite

O2 LEL CO+

20.9 0 0

Current gas re adings screens with CO Plus sensor; calibration gas value set to CO.

O2 LEL H2S+

20.9 0 0

Current gas re adings screens with CO Plus sensor; calibration gas value set to H

To change the direct reading selection of the CO Plus sensor through the calibration gas value settings:

1. Enter the Calibration Menu as detailed above in section 4.7.1.

Page 47

FRESH_AIR SPAN_CAL

GAS_VALUES

IQ LINK EXIT CAL LOCK

REMIND

2. Use the navigation arrows to highlight GAS_VALUES and press the MODE button to enter the gas values screen.

CALIBR ATION GAS LEL 50.0%

3. If the LEL calibration gas setting screen is shown, press the right navigation arrow once to access the calibration gas setting for the CO Plus sensor.

Depending on the existing calibration gas setting for the CO Plus sensor, the calibration gas value will appear as either CO or H

CALIBR ATION GAS CO 50.0ppm

CALIBR ATION GAS

H2S 25.0pp m

4. The right and left navigation arrows are used to move back and forth between the type and the amount of the calibration gas. To change the type of calibration gas, move the cursor to highlight CO

or H

EXIT

CALIBR ATION GAS

CO 50.0ppm

CALIBR ATION GAS

H2S 25.0pp m

5. The up and down navigation arrows may then be used to toggle between CO and H desired gas setting is shown, press the MODE button to save the setting or move on to step 6 to adjust the concentration of the calibration gas.

CALIBR ATION GAS

CO 50.0ppm

↑↓

EXIT

S. Once the

EXIT

CALIBR ATION GAS

H2S 25.0ppm

6. To change the concentration of CO or H2S used in calibration, use the right navigation arrow to highlight the concentration in parts-per-million. Then use the up and down navigation arrows to adjust the gas concentration.

EXIT

CALIBR ATION GAS CO 50.0ppm

↑

EXIT

CALIBR ATION GAS CO 50.1ppm

EXIT

7. Press the MODE button when the appropriate gas selection and concentration have been reached.

Save Ch anges?

YES NO CANCEL

8. Press the MODE button with YES highlighted to save the new settings.

Cal Gas Va lues

Saved

calibration gas mixtures containing both carbon monoxide and hydrogen sulfide when calibrating a PhD Lite with a CO Plus sensor installed. Calibration of the CO Plus sensor with multicomponent calibration gas mixtures containing both CO and H dangerous readings.

S may lead to inaccurate and potentially

Biosystems multi-component calibration gas mixtures containing both carbon monoxide and hydrogen sulfide are labeled as “Not for use with CO Plus sensors”.

calibration gas setting determines whether the instrument is configured for the direct reading of CO, or for the direct reading of H corresponding to the direct reading requirement must be used in the calibration of the instrument. If carbon monoxide is chosen in the calibration gas setti n g option, the displ a y will s how CO+ and carbon monoxide must be used to verify accuracy. Similarly, if hydrogen sulfide is chosen in the calibration gas setting option, the instrument will display H

S+ and hydrogen sulfide must be used to

verify accuracy. Use of the incorrect calibration gas may lead to inaccurate and potentially dangerous readings.

4.7.3 Calibration reminder:

The calibration reminder feature reminds the user when a scheduled calibration is due. The calibration reminder can be set by the user to an interval between 1 and 180 days and is automatically reset by a successful calibration.

4.7.3.1 Changing the calibration reminder

To change the calibration reminder:

1. Enter the Calibration Menu as described above in section 4.7.1.

Do not use multi-component

With the CO Plus sensor, the

S. Calibration gas

FRESH_AIR SPAN_CAL GAS_VALUES IQ LINK EXIT CAL LOCK

REMIND

Page 48

2. Use the navigation arrows to highlight REMIND and press the MODE button to confirm the selection. The calibration reminder interval will then be shown.

Remind Cal

Every 30 Days

EXIT

3. To change the calibration reminder interval, press the right navigation arrow once to highlight the interval in number of days. Once the interval is highlighted, use the up and down navigation arrows to increase or decrease the interval.

Remind Cal

Every 30 Days

EXIT

↓

Remind Cal

Every 29 Days

4. Once the desired calibration reminder interval has been reached, press the MODE button.

EXIT

Save Ch anges?

YES NO CANCEL

5. Press the MODE button with YES highlighted to save the changes to the calibration reminder interval.

Once the calibration reminder has been set, the instrum ent will display the number of days until the next required calibration during every subsequent instrument start up.

Note: The calibration reminder interval has been factory set to 30 days. If the calibration is past due when the PhD Lite is turned on, the instrument will display the message “Calibration Due” and the alarms will be activated. To bypass the calibration due alarm, press the MODE button.

4.7.3.2 Disabling the calibration reminder

To disable the calibration reminder, follow the directions given in section 4.7.3.1 and decrease the interval to zero days.

Remind Cal

Every day

EXIT

↓

Remind Cal

Never

4.7.4 Calibration history

The PhD Lite automatically remembers the latest successful calibration dates for all sensors currently recognized by the unit. To view the calibration history, do the following:

1. Enter the Calibration Menu as described in above in section 4.7.1.

EXIT

FRESH_AIR SPAN_CAL

GAS_VALUES

IQ LINK EXIT CAL LOCK

REMIND

2. Use the navigation arrows to highlight HISTORY and press the MODE button. The following two screens will then be shown in succession:

←→ ↓↑

Next Gas? Cal. Dates

O2 ZERO CAL.

DATES

3. Use the right and left navigation arrows to scroll through the information for the individual sensors.

O2 ZERO CAL. DATES

→

LEL ZERO CAL . DATES

→

LEL SPAN CAL . DATES

→

CO ZERO CAL. DATES

→

CO SPAN CAL. DATES

4. Once the appropriate sensor is reached, use the down navigation arrow to see the most recent span or zero calibration for the given sensor.

LEL SPAN CAL . DATES

↓

Date 08 OC T 2003 Time 09:41

EXIT

5. The down navigation arrow may be pressed again to access the next most recent calibration record.

Date 08 OC T 2003 Time 09:41

↓

Date 02 OC T 2003 Time 13:13

6. Press the MODE button at any time to return to the main menu.

EXIT

Page 49

4.7.5 Last calibration

The details of both the last fresh air/zero and the last span calibration can be viewed by accessing the LAST_CAL option from the Calibration Menu.

To view the details of the last calibration:

1. Enter the Calibration Menu as described above in section 4.7.1.

FRESH_AIR REMIND SPAN_CAL HISTORY GAS_VALUES IQ LINK EXIT

LAST_CAL

2. Use the navigation arrows to highlight LAST_CAL and press the MODE button to confirm the selection. The details of the last calibration will then be shown. The right and left navigation arrows are then used to scroll through the last calibration details for the various sensors.

O2 LAST CAL ZERO 11OCT01

→

LEL LAST CAL ZERO 11OCT01 SPAN 11OCT01 TO 50 MAX ADJUST 92 EXIT

4.7.6 IQ Link

The IQ Datalink System is a data management system that downloads instrument readings, calibration information and other data from Biosystems gas detectors and automatically stores them in a userspecified database. With the IQ Link function enabled the PhD Lite will automatically initiate IrDA communications following a calibration. The instrument is then placed in front of the PC’s IrDA port and the data is downloaded into the IQ Database.

1. Enter the Calibration Menu as described above in section 4.7.1.

FRESH_AIR REMIND SPAN_CAL HISTORY GAS_VALUES LAST_CAL

IQ LINK

EXIT

2. Use the navigation arrows to highlight IQ LINK and press the MODE button to confirm the selection. The IQ Link setting will then be shown. The up and down navigation keys are used to change the enabled/disabled setting.

CONNECT TO IQ LINK AFTER AUTOCAL

ENABLE D

EXIT

↓↑

CONNECT TO IQ LINK AFTER AUTOCAL

DISABL ED

EXIT

3. One the appropriate setting is shown, press the MODE button to exit.

Page 50

Chapter 5. Record Keeping

5.1 Overview of record keeping options

Any version of the PhD Lite may be equipped with an optional datalogger. Starting with instrument firmware version 1.29, every PhD Lite not ordered as a datalogger has been equipped with a “black box” data recorder at no additional cost. Both the black box data recorder and the datalogger store similar information such as gas readings, turn-on times, turn-off times and battery conditions.

Data in instruments with a fully enabled datalogger can be downloaded to an IBM-compatible PC using Biotrak software or the IQ System. Instruments with the black box data recorder must be returned to Biosystems for data retrieval. The datalogger also offers numerous user-configurable options that are not available with the black box data recorder.

Instruments equipped with the datalogger option may also be equipped with Biosystems Touch ID interface for easier entry of user and location ID information into the session memory. Touch ID uses small, virtually indestructible memory buttons to store user ID and location ID information. The user simply touches the Touch ID button to the ID reader on the PhD Lite to

enter a user or location setting into the session memory.

5.2 Black box data recorder

PhD Lite instruments that are ordered without the datalogging option are equipped with a “black box” data recorder at no charge. The “black box” is continually in operation whether the user is aware of it or not. The black box stores important information such as gas readings, turn-on times, turn-off times, temperatures, battery conditions, the 8 most recent calibration dates and settings, types of sensors currently installed, sensor serial numbers, warranty expiration and service due dates, and current alarm settings.

There is a finite amount of memory storage available in the black box data recorder. Once the memory is “full”, the PhD Lite will begin to write the new data over the oldest data. With a typical four-gas configuration, the black box data recorder will store approximately 48 hours of data. Since the oldest data is overwritten first, newer data is always conserved.

If the data in the black box is required for any reason, the entire PhD Lite instrument must be returned to Biosystems, where the data will be extracted and a report will be generated. The unit and the report will then be returned to the user. Simply call Biosystems at (800) 711 6776 to obtain a return authorization number. There is no charge for the downloading service, but the user is responsible for any freight charges incurred.

Note: The PhD Lite black box data recorder can be upgraded to a full user-configurable datalogger at any time. Call Biosystems Technical Service Department at 800 711 6776 x-509 for details.

5.3 Datalogger upgrade

The “full” datalogger option is available on the PhD Lite for users who need imm ediate access to the data stored in the instrument, or who require the ability to customize their record-keeping process.

Datalogging is a "transparent" function that is continually in operation. As long as the datalogger has not been disabled, it is not necessary to do anything special to begin logging data. Simply turning on the instrument causes it to begin recording data. The information stored by the datalogger may be downloaded to a Windows-compatible PC to create a permanent record, or directly displayed by the PhD Lite.

Upon turn on, PhD Lite instruments with an enabled datalogger will display the sampling interval among the self-test screens as shown below. In this case, the default sampling interval of 1 minute is shown.

Sampling Interval 01m00s 48h41m

With the datalogging option, the PhD Lite will automatically record gas readings, turn-on / turn-off times, temperatures, battery conditions, the 8 most recent calibration dates and settings, types of sensors currently installed, sensor serial numbers, warranty expiration and service due dates, temperature compensation curves, and current alarm settings. The PhD Lite automatically updates all of this information whenev er the instrument is turned on, whenever a change is made during operation, and again as the instrum ent is turned off.

The datalogger in the PhD Lite can store the exposure values for approximately 2900 datalogging intervals when using a four channel configuration (O

S). This provides for storage of approximately 48

and H

hours of four-gas monitoring when a one-minute datalogging interval is specified. Using a longer datalogging interval increases the length of monitoring time before the oldest data is overwritten by new data. For instance, if a datalogging interval of two minutes is selected, a little over 97 hours of monitoring data will be stored before the oldest data is overwritten. Different sensor configurations and/or datalogging interval settings allow for more or less datalogging time before the oldest data is overwritten.

5.3.1 BioTrak database software

Biotrak software is designed to facilitate both the downloading of stored data and the uploading of new instrument configurations. BioTrak allows information to be retrieved from the PhD Lite and also allows the PhD Lite to be programmed directly from a Windowscompatible PC.

It is important to note that it is not necessary to use the BioTrak software to program the PhD Lite. Configuration and setup options may be programmed directly by using the navigation arrows on the instrument keypad.

, LEL, CO,

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Manual programming procedures are covered in detail be lo w in sec tion 5.4.

BioTrak software has been designed to simplify programming, downloading, and data analysis. The software allows optional instrument setups to be created by "filling out" forms right on the computer screen.

Note: The PhD Lite is designed to download data from the instrument to a PC using an IrDA compliant infrared data transceiver. It may be necessary to purchase an IrDA transceiver if your computer is not equipped with this feature. Most new laptopstyle PCs are equipped with an IrDA port, but many desktop and older laptop-style PC’s are not. Consult your computer’s reference manual for details.

Once information has been downloaded to the computer, it may be used for a variety of purposes. Data may be displayed and reviewed in detail through the computer monitor screen, or used to generate and print reports, tables and graphs of time history exposure data. It is also possible to export records to other software applications in the form of ASCII text or in a spreadsheet format. Another option is to simply retain downloaded records within the BioTrak program for future use as needed.

Note: The remaining material in this chapter is designed to acquaint the user with datalogging features that can be programmed through the PhD Lite instrument itself. Consult the BioTrak Reference Manual for complete instructions on the use of Bio Trak software.

5.3.2 IQ System

Biosystems Instrument Quality (IQ) System offers all of the data tracking features of BioTrak, but also includes many features that were not possible when BioTrak was originally released. The IQ Controller can be used with IQ Docking Stations to provide hands-free calibration of up to 10 Biosystems gas detectors. The IQ System is also e-mail capable and can automatically notify you when an instrument fails calibration.

Call Biosystems for more information on the IQ Systems, or visit the IQ System website at http://www.bioIQsystems.com

5.4 Datalogger menu

It is possible to customize the way the PhD Lite records data in a number of different ways. Options include extended recording time, tagging the exposure data with time and date information, or assigning location and ID information.

PhD Lite instruments equipped with datalogging capability will have an additional subdirectory in the Main Menu called DATALOGGER. The Datalogger Menu provides access to all user-configurable datalogging options. To enter the Datalogger Menu:

1. Turn the instrument on and wait until the gas readings screen appears.

2. Press the MODE button until you reach the Information screen (shown below).

01:15 15:08

3.9V 71F

3. Hold down the left navigation arrow for 3 seconds or until EXIT appears and is highlighted.

01:15 15:08

3.9V 71F

4. Press the down navigation arrow once to highlight MENU and press the MODE button. The Main Menu will then be displayed and EXIT will be highlighted.

5. Use the navigation arrows to highlight DATALOGGER and press the MODE button.

The datalogger menu will then be displayed.

5.4.1 Setting the datalogging interval

The datalogger samples continuously, so the data stream must be broken into intervals to be recorded. The datalogging interval defines the frequency of the breaks in the data stream. The interval may be set anywhere between one second and one hour by using the navigation arrows as detailed below. The default datalogging interval is 1 minute.

There is a finite amount of memory storage available in the PhD Lite. Once the memory is “full”, the PhD Lite will begin to write the new data over the oldest data. In this way, the newest data is always conserved. Different sensor configurations and/or datalogging intervals may increase or decrease the length of time before old data is overwritten. A longer sampling interval will allow the retention of more hours of data before old data is overwritten making the PhD Lite ideal for long-term sampling projects.

The datalogger in the PhD Lite can store the exposure values for approximately 2900 datalogging intervals when using a four channel configuration of O and H

ALARMS CALIBRATION OPTIONS SCREEN VIEW DATALOGGER TIME

ALARMS CALIBRATION OPTIONS SCREEN VIEW TIME EXIT

INTERVAL CLEAR_DL SESSIONS COMMN ID_INFO

EXIT

DATALOGGER

EXIT

S. This provides for storage of approximately 48

EXIT

, LEL, CO,

Page 52

Note: Calculations that are made on an ongoing basis (i.e. TWA, STEL, Ceilings, and Peak exposure values) are updated at regular intervals by the PhD Lite microprocessor. Adjustments to the datalogging interval do not effect the way in which TWA, STEL, Ceiling, and Peak exposure values are calculated.

To adjust the sampling interval:

1. Enter the Datalogger Menu as described above in section 5.4.

INTERVAL

SESSIONS COMMN ID_INFO EXIT

CLEAR_DL

2. Use the navigation arrows to highlight INTERVAL and press the MODE button.

SAMPLING INTERVAL

On 01:00

3. Use the right and left navigation arrows to highlight the time interval. The interval is given in terms of minutes and seconds.

48:41 EXIT

SAMPLING INTERVAL On 01:00

As discussed above, there is a finite amount of memory storage in the PhD Lite. As the sampling interval is either lengthened or shortened, so is the time-estimated figure, which is given in hours and minutes and appears above the word EXIT on the right side of the screen. This figure represents the length of time before the oldest data will be overwritten.

4. With the interval highlighted, use the up and down

navigation arrows to adjust the interval

48:41 EXIT

SAMPLING INTERVAL On 01:00

↑

48:41 EXIT

SAMPLING INTERVAL On 02:00

5. Once the sampling interval is adjusted, use the navigation arrows to highlight exit and press the MODE button. The following two screens will be shown in succession.

97:22 EXIT

Longes t Session Estimate 97h22m

Save Chan ges? YES NO CANCEL

6. Press the MODE button with YES highlighted to

save the changes.

Sampling interval

Saved

5.4.1.1 Enable/disable datalogger

To enable or disable the datalogger:

1. Enter the Datalogger Menu as described above in section 5.4.

INTERVAL

SESSIONS COMMN ID_INFO EXIT

CLEAR_DL

2. Use the navigation arrows to highlight INTERVAL

and press the MODE button. With On or Off highlighted, the up and down navigational arrows are used to toggle between ON and OFF.

SAMPLING INTERVAL

On 01:0 0

↑↓

48:41 EXIT

SAMPLING INTERVAL

Off

3. Once the appropriate setting is shown use the

navigation arrows to highlight exit and press the MODE button to enter the new interval. The following screen will be shown.

EXIT

Save Changes?

YES NO CANCEL

4. Press MODE with YES highlighted to save the new sampling interval setting.

Sampling interval

Saved

5.4.2 Clearing the datalogger

The datalogger can be cleared of all information through the CLEAR DL option.

To clear the datalogger, do the following:

1. Enter the Datalogger Menu as described above in

section 5.4.

INTERVAL SESSIONS COMMN ID_INFO EXIT

CLEAR_DL

2. Use the navigation arrows to highlight CLEAR DL

and press the MODE button. The following two screens will then be shown in succession.

Warnin g Lose

All Sess ions Data

Clear Da talogger ?

YES NO

3. Press the MODE button with YES highlighted to

clear the datalogger memory.

DATALOGGER CLEAR

COMPLETED

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5.4.3 Sessions

Data recorded for all monitoring sessions currently in the datalogger memory can be accessed through the SESSIONS subdirectory of the Datalogging Menu. To view the session memory:

1. Enter the Datalogging Menu as described above in section 5.4.

INTERVAL CLEAR_DL

SESSIONS

ID_INFO EXIT

COMMN

2. Use the navigation arrows to highlight SESSIONS and press the MODE button. The information gathered from the most recent operating session will be displayed.

#1 08:14- 16:45 18 OCT 20 03

3. The right and left navigation arrows are used to scroll through the data from individual sessions.

#1 8:14-16:45 18 OCT 20 03

→

#2 8:02-17:23 13 OCT 20 03

4. The up and down navigation arrows are used to access specific data from the individual monitoring session that is displayed.

#2 8:02-17:23 13 OCT 20 03

↓

PEAK LOW HIGH O2 20.5 20.9

↓

PEAK LEL CO H2S 0 0 0

5. Press the MODE button at any time to return to the Main Menu.

5.4.4 Communications mode

Communications mode enables the PhD Lite IrDA port for downloading to or uploading from a personal computer. To enter communications mode, do the following:

1. Enter the Datalogger Menu as described above in section 5.3.2.

2. Use the navigation arrows to highlight COMM and press the MODE button.

INTERVAL CLEAR_DL SESSIONS ID_INFO EXIT

COMM

TO COMM MODE

YES NO

3. Press the MODE button with YES highlighted to enter communication mode and enable the IrDA port.

Note: If an IrDA link with a PC is not established within 30 seconds of the initiation of Communic atio n s Mode, the PhD Lite will shut itself off.

5.4.5 ID information

The ID_INFO subdirectory of the Datalogger Menu controls manual access to the location and user identity functions. To enter the ID_INFO menu:

1. Enter the Datalogger Menu as described above in

section 5.4.

2. Use the navigation arrows to highlight ID_INFO and press the MODE button.

5.4.5.1 User and location lists

The PhD Lite is capable of storing up to 15 different user ID’s and 15 different location ID’s. User and location lists may be manually entered into the PhD Lite’s memory through the USER_LIST and LOC_LIST options in the ID Information Menu. The list functions control the entry of user and location names into the datalogger memory. To access the existing list, or to start a list:

1. Enter the ID_INFO option from the Datalogger Menu as described above in section 5.4.5. Use the navigation arrows to highlight USER_LIST or LOC_LIST.

2. Press the MODE button. User #1 or Location #1 will then be shown.

3. Press the MODE button with NEXT highlighted to scroll through the list of users or locations.

INTERVAL CLEAR_DL SESSIONS COMM

ID_INFO

USER_LIST USER_ID LOC_LIST LOC_ID TOUCH_ID

USER_LIST

LOC_LIST LOC_ID TOUCH_ID EXIT

USER_LIST USER_ID

LOC_LIST

TOUCH_ID EXIT

User #1

<651 S Main St >

Location#1

EXIT

USER_ID

LOC_ID

NEXT EXIT

Page 54

User #1

User #2

NEXT EXIT

3. To enter a new name or location to the datalogger memory, scroll through the names until the first blank screen is reached.

< >

User #3

NEXT EXIT

5. Press the right arrow key once to move the cursor into the text line.

< >

User #3

NEXT EXIT

6. Press the MODE button once. The select character screen will then be shown.

S E L E C T

A B C D E F G H I J K L M N O P Q R S

T U V W X Y Z 1 2 3 4 5 6 7 8 9 0 ’ , . /

C H A R A C T E

7. Use the right and left navigation arrows to highlight the character required.

8. Press the MODE button to enter the character.

S E L E C T A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 1 2 3 4 5 6 7 8 9 0 ’ , . /

<P >

C H A R A C T E

User #3

NEXT EXIT

9. Press the right navigation arrow once to move the cursor to the next space in the text line.

<P >

User #3

NEXT EXIT

10. Press the MODE button to return to the select character screen and repeat steps 7 though 9 until the new name or location appears in the text line.

User #3

NEXT EXIT

11. To enter another name, press the right navigation arrow until NEXT is highlighted and press the MODE button. The next memory location will then be shown. Repeat steps 6 through 10 to enter the next name or location.

< >

User #4

NEXT EXIT

12 To exit, use the right or left navigation arrows to

highlight NEXT and then press the down navigation arrow once to highlight EXIT.

< >

User #4

NEXT EXIT

13 Press the MODE button with EXIT highlighted to

leave the user or location list. The “save changes” screen will then be displayed.

Save Chan ges? YES NO CANCEL

14. Press the MODE button with YES highlighted to confirm the changes.

Users Li st

Saved

Note: Names and locations may also be added using a PC equipped with BioTrak software and an IrDA port.

Note: The user and location ID is not retained if the PhD Lite is turned off. The user and location ID must be re-entered or selected from the list prior to any new operating session.

5.4.5.2 User and location ID’s

User and location names may be manually entered into the current session memory by selecting the name or location ID while in the USER_ID or LOC_ID option of the datalogger menu.

Note: If th e User or Locat io n ID is e n tered or changed after the first two minutes of any session, a new session is automatically created.

1. Enter the ID_INFO option from the Datalogger Menu as described above in section 5.4.5. Use the navigation arrows to highlight USER_ID or LOC_ID.

2. Press the MODE button. One of the following screens will then be shown:

3. User and location ID’s can be manually entered by pressing the right arrow key once to highlight the first space in the location memory.

4. To manually enter the ID, follow the instructions above in section 5.4.5.1 starting at instruction 6.

USER_LIST USER_ID LOC_LIST LOC_ID TOUCH_ID EXIT

< >

User ID

< >

LOCATION:

< >

User ID:

LIST EXIT

Page 55

5. To select a user or location ID from the pre-entered list, press the MODE button with LIST highlighted.

User #1

ENTER

EXIT

6. The right and left navigation arrows are then used to scroll through the user or location lists.

User #2

ENTER

EXIT

7. Once the correct user or location ID is displayed, press the MODE button with ENTER highlighted.

User #2

ENTER

EXIT

8. Press the down navigation arrow once to highlight EXIT and press the MODE button.

Save Chan ges? YES NO CANCEL

9. Press the MODE button with YES highlighted to confirm the changes.

Curren t User ID

Saved

Note: The user and location ID is not retained if the PhD Lite is turned off. The user and location ID must be re-entered or selected from the list prior to any new operating session.

5.4.5.3 Touch ID option

PhD Lite detectors with the “full” datalogging option may also be equipped with Biosystems unique Touch ID automatic memory download system. The system uses small, virtually indestructible memory buttons to store user ID and location ID information. User and Location ID’s can be set by simply pressing a pre-programmed “Touch Memory Button” to the “Touch Memory Module” on the back of PhD Lite while the instrument is in normal gas detection mode.

USER IS NOW

BILL SAWKA

Note: If th e User or Locat io n ID is e n tered or changed after the first two minutes of any session, a new session is automatically created.

5.4.5.3.1 Touch ID menu

In PhD Lite instruments with Touch ID, a TOUCH ID option will be provided in the Datalogger Menu.

Touch ID buttons contain either a name or a location and may be programmed with the instrument through the Touch ID function in the Datalogger Menu.

To program a Touch ID button:

1. Enter a name or location into the session memory as detailed in section 5.4.5.1.

2. Enter the Datalogger Menu as described above in section 5.4.

USER_LIST USER_ID LOC_LIST LOC_ID

TOUCH_ID

EXIT

3. Use the navigation arrows to highlight TOUCH ID

and press the MODE button.

5.4.5.3.1.1 Location memory

LOCATION_MEMORY

USER_ID_MEMORY CLEAR_MEMORY

EXIT

To program a location from the instrument onto a Touch ID button:

1. Set the location in the current session to the location

that will be written onto the Touch ID button. Locations may be manually input into the PhD Lite

with the directions given in section 5.4.5.1.

2. Enter the Touch ID Menu as described above in section 5.4.5.3.1.

LOCATION_MEMORY

USER_ID_MEMORY CLEAR_MEMORY EXIT

3. Use the up navigation arrow to highlight LOCATION

MEMORY and press the MODE button.

INSERT ID BUTTON PLEASE

4. Press the Touch ID button to the Touch ID reader on the back of the PhD Lite.

EXIT

TOUCH ID FOUND

WRITIN G COMPLETE D

5. The instrument will program the current location setting onto the Touch ID button and return to the Main Menu upon completion.

5.4.5.3.1.2 User ID memory

The User ID memory includes the individual’s name, language preference and operating mode preference. To program this data from the instrument onto a Touch ID button:

1. Set the user ID in the current session to the ID that should be written onto the Touch ID button. User ID’s may be manually input into the PhD Lite with the directions given in section 5.4.5.1.

2. Enter the Touch ID Menu as described above in section 5.4.5.5.

LOCATION_MEMORY

USER_ID_MEMORY

CLEAR_MEMORY EXIT

3. Use the up navigation arrow to highlight USER ID MEMORY and press the MODE button.

INSERT ID BUTTON

PLEASE

EXIT

Page 56

4. Press the Touch ID button to the Touch ID reader on the front of the PhD Lite.

TOUCH ID FOUND

WRITIN G COMPLETE D

5. The instrument will program the current user ID setting onto the Touch ID button and return to the Main Menu upon completion

5.4.5.3.1.3 Clear ID button

To clear a Touch ID button:

1. Enter the Touch ID Menu as described above in

section 5.4.1.

LOCATION_MEMORY

USER_ID_MEMORY

CLEAR_MEMORY

EXIT

2. Use the up navigation arrow to highlight CLEAR ID BUTTON and press the MODE button.

INSERT ID BUTTON

PLEASE

3. Press the Touch ID button to the Touch ID reader on the front of the PhD Lite.

EXIT

TOUCH ID FOUND

AND DELE TED

The instrument will delete the current data contained on the Touch ID button and then return to the Main Menu upon completion.

Page 57

Chapter 6. Basic maintenance

CAUTION: Maintenance of the PhD Lite should only be performed by appropriately trained personnel.

6.1 Sensors

Figure 6.0 Ph D Lite ex t er n al f e atu r es

At instrument start up, the PhD Lite is designed to recognize the “Smart Sensors” that are installed and automatically set the appropriate alarm and display readings. The PhD Lite automatically recognizes when sensor changes have been made since the instrument was last turned on.

Not e: Any changes made to t he sensors install ed, even changing one sensor for another of the exact same type, will trigger a “Needs Cal” message the next time the instrument is turned on. The PhD Lite must be calibrated before being returned to service following any sensor changes.

Caution: The PhD Lite must be turned off prior to

removing or replacing sensors.

6.1.1 Sensor replacement

Note: The PhD Lite must be turned off to replace sensors.

1. Remove the three philips screws and take off the sensor cover from the front of the instrument.

For replacement of an existing sensor perform steps 2a and 3a then proceed to step 4a or 4b.

2a. From the outer surface of the sensor cover, use a

3a. Remove any remaining traces of adhesive from the

recessed hole in the sensor cover.

For new sensor installation perform steps 2b and 3b then proceed to step 4a or 4b.

2b. From the outer surface of the sensor cover, push

out yellow dust cap with a blunt tool.

3b. Remove sensor blank from the sensor

compartm ent.

For Sensors O

, LEL, CO, CO Plus, CO-H, H2S, NO,

DUO-TOX perform step 4a then proceed to step 5.

4a. Firmly press the new filter ring assembly into the

recessed hole in the sensor cover with ridge side up.

For Reactive Gas Sensors: SO

perform step 4b then proceed to step 5.

ClO

, NO2, PH3, HCN, Cl2,

4b. Firmly press the new teflon spacer into the

recessed hole in the sensor cover. For optimal sensor response, no external filter element is used with these sensors.

CAUTION: Since the reactive gas sensor face

is openly exposed to the ambient environment, extra care should be taken to prevent water or any other liquids from coming into contact and remaining on the sensor face.

5. Peel the backing paper from the new rubber gasket and center it over the newly mounted filter ring assembly with the adhesive side down.

6. Remount sensor cover and secure with three philips screws. DO NOT overtighten.

7. Install functional battery pack or batteries in the detector.

8. New sensors must be allowed a stabilizing time – with detector powered off and with functional batteries or battery pack installed, according to the following schedule.

Sensor Stabilization Period

Oxygen (54-25-90) 1 hour LEL (54-25-80A) 5 minutes All Toxic sensors except those shown below 54-25-04 NH3 Sensor 54-25-06 NO Sensor

9. The PhD Lite will automatically recognize the changes that have been made upon turn on and display the “Warning Needs Cal” message.

10. Calibrate the PhD Lite with calibration gas appropriate for the new sensor before the instrument is put back into service.

11. If newly installed sensor(s) do not appear during power-up, or if the message "not supported"

15 minutes

24 hours

Page 58

appears, contact Biosystems Instrument Service Dept. for further guidance.

Note: The first fresh air calibration adjustment after installation of a new sensor should be done using the “manual” calibration procedure as discussed in section 4.5 of this manual

6.1.2 New sensor releases

Biosystems occasionally releases a new type of toxic sensor, or makes changes to existing sensors in order to improve performance. In some cases it may be necessary to update the PhD Lite’s internal software before making use of the new sensor. If a sensor that is incompatible with the current configuration of the instrument’s internal software is installed, a message stating that the sensor is “Not Supported” will be displayed at the time the instrument is turned on.

For instructions on updating the internal instrument software in your PhD Lite, see section 6.4 below.

6.1.3 Troubleshooting sensor problems

Many difficulties with sensors can be resolved easily. Below are a few of the most common sensor-related problems.

6.1.3.1 Can’t make automatic fresh air/zero calibration adjustment

Possible causes and solutions

1. The atmosphere in which the instrument is located is contaminated (or was contaminated at the time the instrument was last fresh air calibrated.

2. A new sensor has just been installed.

3. Instrument has been dropped or banged since last turned on.

4. There has been a significant change in temperature or humidity since the instrum ent was last used.

Solution:

Take the instrument to fresh air and allow readings to stabilize. Perform a manual fresh air/zero adjustment as discussed in section 4.5.1. If the manual fresh air/zero procedure fails to correct the problem, call Biosystems Instrument Service Department at (860) 344-1079 or (800) 711-6776.

6.1.3.2 Can’t make span calibration adjustment.

Causes:

1. Instrument failed the last fresh air / zero calibration.

2. Empty calibration gas cylinder.

3. Expired calibration gas cylinder.

4. Calibration gas setting does not correspond to calibration gas.

5. Sensor has drifted outside of the range for automatic calibration.

6. LEL only: Type of calibration gas (standard) has changed significantly.

7. Dead sensor.

8. Instrument problem.

Solutions:

1. Verify that the instrument can be fresh air / zero calibrated by performing the procedure discussed above in section 6.1.3.1.

2. Verify that the calibration gas is not empty.

3. Verify that the calibration gas is not expired.

4. Verify that the calibration gas is the correct type for the sensor and that the calibration gas settings are identical to those given on the cylinders. See section 4.7.2. for instructions related to calibration gas settings.

5. Span calibrate the instrument manually by following the instructions given in section 4.5.2.

6. If the calibration gas standard has changed significantly, span calibrate the instrument manually be following the instructions given in section 4.5.2.

7. Replace sensor.

8. Send instrument back to Biosystems.

6.2 Motorized pump

A motorized sample pump is available for the PhD Lite for remote sampling. The motorized pump is powered by the PhD Lite battery. When the pump is attached

Page 59

and functioning normally, an animated “” icon will appear in the upper left-hand corner of the LCD display.

 O2 LEL CO H2S

20.9 0 0 0

CAUTION: Never perform remote sampling with

the PhD Lite without the sample probe assembly. The sample probe handle contains replaceable filters designed to block moisture and remove particulate contaminants. If the pump is operated without the probe assembly in place, particulate contaminants may be drawn into the instrument causing damage to the pump, sensors and internal components of the PhD Lite.

The motorized sample pump includes a pressure sensor designed to protect the PhD Lite from exposure to water or other liquids. If there is a sufficient change in pressure in the sample draw assembly due to fluid intake or other blockage, the pump immediately shuts down. After a few seconds audible and visible alarms indicating a low flow condition will also be activated.

Pump Fault

Pump Lo w Flow

Remov e Blockage

Pump Lo w Flow

MODE=Acknowledge

CAUTION: Make sure that the sample draw tube

is not inserted into a fluid horizontally or at a low angle.

The pressure sensor in the motorized pump is designed to detect changes while the sample-draw probe is being held in a vertical position. If the probe is held horizontally or at a low angle while immersed in a fluid, pressure sufficient to cause the pump to shut down may not be generated, and water may be drawn into the pump assembly causing damage to the pump, sensors and internal components of the PhD Lite.

To avoid potential damage, care must be taken to keep the probe vertical whenever fluids may be present.

As an additional safeguard, the pump contains an internally-housed particulate filter. If the pump is operated without the sample probe assembly in place, or in a particularly dirty atmosphere, this internal filter may become clogged and require replacement. Standard accessories with every 54-26-0101 motorized pump include a package of 10 replacement filters for the pump (Biosystems part number 61-001).

6.2.1 Pump performance

The PhD Lite automatically verifies pump performance upon start-up of the instrument, or whenever the pump is attached during normal operation.

6.2.1.1 Verifying pump performance

Pump performance is automatically tested when the pump is attached to the instrument. A similar test is automatically initiated if the pump is attached prior to turn-on.

1. Attach the pump to the PhD Lite. Make sure that the sample probe and tubing assembly is attached to the pump inlet.

Pump De tected

2. The PhD Lite will automatically prompt the user to test the pump system.

Pump Testing Block Sa mple

3. Verify that there are no leaks in the system by covering the end of the sample probe tube with a finger. If there are no leaks a message will be displayed indicating that the pump test passed.

Pump Test Passed

Remov e Blockage

4. Press the MODE button to reset the pump. The following screen will then be displayed. Notice the

animated “

” icon in the upper left corner of the LCD

display, which indicates that the pump is attached and in normal operation.

 O2 LEL CO H2S

20.9 0 0 0

6.2.1.2 Pump test failed

The pump includes a pressure sensor designed to measure pump flow. If there is insufficient pump flow, the pump test will fail and the PhD Lite will display the following message.

Pump Test Failed

Remove Pump

Remove the pump. Since pump failure results from insufficient pump flow, there is either a leak in the sample draw system or the pump itself is not operating properly.

To locate or rule out a leak in the sample draw system:

1. Remove the sample draw probe and tubing from the pump.

2. Reattach the pump to the instrument without the sample probe and tubing assembly. The instrum ent will again proceed with the pump test.

3. Block the pump inlet with a finger. If the pump test passes, then the leak is located in the probe and tubing assembly. If the pump test fails, then the failure is inside of the pump itself.

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If the leak is located in the sample probe and tubing assembly, inspect it and look for the leak. See section

6.3 for instructions on the replacement of key probe parts.

If the leak is located in the pump itself, the pump may be disassembled. See section 6.2.2 for instructions on how to open the pump assembly.

6.2.1.3 Low flow pump failure

If the instrument detects a pump fault during normal operation, it will automatically indicate that a pump fault exists on the display and the audible and visible alarms will be activated.

Pump Fault

The instrument will then instruct the user to remove the blockage.

Pump Lo w Flow

Remov e Blockage

Pump Lo w Flow

MODE=Acknowledge

In most cases, the cause of the blockage is easily recognized. Remove the blockage, reattach the hose and probe assembly and press the MODE button to reset the pump. Once the pump starts up, retest the pump seals by placing a finger over the end of the sample probe.

6.2.2 Internal pum p f ilt er rep lacem ent

The following procedure describes how to replace the internal pump filter:

Figure 6.2 . 2 Inter n al PhD Lite pum p di agram

1. Remove the four bottom screws from the pump assembly and disassemble the upper and lower sections of the pump case.

2. Rem ove the two pieces of tubing from the filter cap by gently twisting and pulling until the ends are free.

3. Remove the filter cap and replace the used 61-001 filter.

4. Reattach the filter cap and tubing. Make sure the

tubing is secure to the filter cap before

reassembling the upper and lower pump cases.

5. Reassemble the upper and lower sections of the pump case. Do not over-tighten the four screws!

Note: Proper operation must be verified before the pump is put back into service. See section 6.2.1.1 above.

6.2.3 Specific problems with motorized pump

6.2.3.1 Pump will not turn on

Possible causes:

Pump is not properly attached to the instrument. Instrument is not turned on. Instrument battery too low

for pump operation.

Solution(s):

Make sure pump is properly attached to instrument, recharge or replace instrument batteries.

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6.2.3.2 Can’t resume normal operation after a “Low Flow” shut down

Possible causes:

Sample probe or internal pump filters need replacement, sample hose kinked, sample probe and probe assembly contains fluids.

Solution(s):

Turn off PhD Lite, remove pump, disconnect sample probe an hose assembly, allow any trapped fluids to drain; replace filters as necessary, examine hose to make sure there are no kinks blocking normal flow.

6.3 Sample probe assembly

The sample probe handle contains moisture barrier (hydrophobic) and particulate filters designed to remove

contaminants that might otherwise harm the instrument.

CAUTION: Never operate the PhD Lite in remote

sampling mode without the sample probe and hose assembly. The sample probe handle contains replaceable filters designed to block moisture and remove particulate contaminants. If the pump is operated without the probe assembly in place partic ulate contaminants may c ause d amage to the pump, sensors and internal components of the PhD Lite.

Sample probe filters should be replaced whenever visibly discolored due to contamination. A spare filter replacement kit (Biosystems part number 54-05-K0401) is included with every PhD Lite.

6.3.1 Changing sample probe filters

Figure 6.3 PhD Lite sa mple dr a w prob e

The threaded sample probe handle is unscrewed (as shown in Figure 6.3 above) to provide access to the filters. The particulate filter is held in place by a clear filter cup. To replace the particulate filter, remove the old filter and cup, insert a new filter into the cup, and slide the cup back into place in the probe handle. The hydrophobic barrier filter fits into a socket in the rear section of the probe handle. (The narrow end of the hydrophobic barrier filter is inserted towards the rear of the handle.)

6.3.2 Changing sample probe tubes

The standard 11.5” long probe tube is held in place by means of a hex-nut compression fitting and compression sleeve. The standard probe tube is designed to be easily interchangeable with other custom length sections of 1/4” OD tubing, or probe tubes made of other materials (such as stainless steel).

To exchange probe tubes, loosen the hex-nut compression fitting, remove the old tube, slide the compression sleeve into place around the new tube, insert the new tube into the probe handle, and replace and tighten the hex-nut.

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6.4 Firmware upgrade from the Biosystems website

The instrument firmware for the PhD Lite may be upgraded directly from Biosystems website. The Flash download is a two-step download process that will prepare your PC to update the flash program of your PhD Lite.

Note: An IrDA port is required to download the new Flash Program to your PhD Lite.

To install the files:

1. Close all applications (except the internet

connection) that are currently running on your computer.

2. Go to www.biosystems.com and select the

Technical / Software Downloads / PhD Lite from control bar at the right of the screen.

3. Follow the directions given on the screen to

download the flash utility program and then the flash file itself.

6.5. Returning your PhD Lite to Biosystems for

service or repair

Please contact the Biosystems Service Department at (860) 344-1079 to obtain a “Return Authorization” number prior to shipment. A Biosystems Instrument Service Representative will record all relevant information or special instructions at that time.

To ensure safe transport, whenever possible please use the original PhD Lite packing materials when returning instrum ents to Biosystems for service. If the original packing materials are not available, please take additional care to pack the instrument in packing materials that will protect the instrument and accessories during shipment.

Note: The return authorization number must be clearly marked on the outside of the box.

Writing the return authorization number prominently on the outside of the box ensures that the return will be immediately identified and logged into our system at the time it is received. Proper tracking helps avoid unnecessary delays in completion of service procedures.

Please contact the Biosystems Instrument Service Department at (800) 711-6776 or (860) 344-1079 if you require any additional information.

Thank you for choosing the PhD Lite, and thank you for choosing Biosystems.

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6.6 Exploded view and parts list

Chart 1

Ref

# 1 27-114 Display Overlay 2 35-0188 Battery Door Assembly 3 35-0175

4 10-327 LCD Insulator 5 35-0187 Graphic LCD Display 6 05-1123 Polycarbonite Fiber Washer 7 05-1118 Screw For Display 8 10-331 Side Grip 9 10-334 Upper Alkaline Battery

10 10-335 Lower Alkaline Battery

11 35-0240

12 34-046 Gasket Main Housing 13 35-0172 Lower Case Assembly 14 17-036 O-ring for Main Housing

15 05-1117 Main Housing Screw 16 31-255 IRDA overlay

17 10-332 IRDA Lens 18 35-0237 Alarm Board Phd Lite

Part

Number

35-0205

35-0241

Description

Alkaline Top Case Assembly NiMH Top Case Assembly

housing

housing Alkaline Main Board Phd Lite NiMH Main Board Phd Lite

screws

Page 64

Appendices

Appendix A Toxic gas measurement - Ceilings, TWAs and STELs

Many toxic substances are c ommonly encountered in industry. The presenc e of toxic substances may be due to materials being stored or used, the work being performed, or may be generated by natural process es. Exposure to toxic substances c an produce dis ease, bodily injury, or death in unprotected workers.

It is important to determine the amounts of any toxic materials potentially present in the workplace. The amounts of toxic materials potentially present will aff ect the procedures and personal protective equipment which must be used. The s afest c ourse of action is to eliminate or permanently control hazards through engineering, workplace controls, ventilation, or other safety procedures. Unprotected workers may not be expos ed to levels of toxic contaminants whic h exceed Permissible Exposure Limit (PEL) concentrations. Ongoing monitoring is necess ary to insur e that exposure levels have not changed in a way that requires the use of different or more rigorous procedures or equipment.

Airborne toxic substances are typically classified on the basis of their ability to produce physiologic al effects on exposed workers. Toxic substances tend to produce symptoms in two time frames.

Higher levels of exposure tend to produc e immediate (acute) effects, while lower levels of long-term (chronic) exposure may not produce physiological s ymptoms for years.

Hydrogen sulfide (H2S) is a good example of an acutely toxic substance which is immediately lethal at relativel y low

concentrations. Exposure to a 1,000 ppm (parts per million) concentration of H2S in air produces rapid paralysis of the

respirat ory system, cardiac arrest, and death within minutes.

Carbon monoxide (CO) is a good example of a chronically toxic gas. Carbon monoxide bonds to the hemoglobin molecules in red blood cells. Red blood cells contaminated with CO are unable to transport oxygen. Although very high concentrations of c arbon monoxide may be acutely toxic, and lead to immediate respiratory arrest or death, it is the long term physiological eff ects due to chr onic exp osure at lower levels that take the greatest toll of affected workers. This is the situation with regards to smokers, parking garage att endants, or others chronic ally exposed to carbon monoxide in the workplace. Exposure levels are too low to produce immediat e symptoms, but small repeated doses reduc e the oxygen c arrying capacity of the blood over time to dangerously low levels. This partial impairment of the blood supply may lead over time to serious physiological consequences.

Because prudent monitoring programs must take both time frames into account, there are three independent exposure measurements and alarm types built into the PhD5 design.

Time History Graph

Ceiling

2. Time Weighted Average (TWA):

The maximum average concentration to which an unprotected worker may be expos ed over an eight hour working day. During this time, STEL and ceiling concentration limits may not be exceeded.

Time History Graph

(8 hour)

Ceiling

TWA

3. Short Term Exposure Limits (STEL):

Toxic substances may have short term exposure limits which are higher than the eight hour TW A. The STEL is the maximum average concentration to which an unpr otected worker may be exposed in any fifteen minute interval during the day. During this time, neither the eight hour TWA or the ceiling concentration may be exceeded.

Any fifteen minute periods in which the average STEL concentration exceeds the permissible eight hour TWA must be separated from each other by at least one hour. A maximum of four of t hese periods are allowed per eight hour shift.

1. Ceiling level:

OSHA has assigned some, but not all, toxic substances with a ceiling level. T his is the highest c oncentr ation of a toxic substance to which an unprotect ed worker should ever be exposed, even for a very short time. Nev er enter an envir o n m ent even mom entarily

when concentrations of toxic substances exceed the ceiling level.

Time History Graph

15 Minutes

Ceiling

STEL TWA

Page 65

Appendix B PhD Lite sensor ranges

Part No. Description Range Resolution

54-25-80 LEL Combustible gas 0 – 100% LEL 1% LEL 54-25-90 O

Oxygen 0 – 30%/Vol. 0.1%

54-25-01 CO Carbon monoxide 0 – 1000 PPM 1 PPM

54-25-05

CO+ CO Plus dual purpose CO / H

Provides a non-specific readout for CO and H2S

CO: 0 – 1000 PPM H

S: 0 – 200 PPM

1 PPM

54-25-19 CO-H CO Minus, reduced sensitivity to H2 0 – 1000 PPM 1 PPM 54-25-02 H2S Hydrogen sulfide 0 – 200 PPM 1 PPM

54-25-14

Duo-Tox Dual channel CO/H

Provides substance specific readouts for CO and H2S

CO: 0 – 1000 PPM

S: 0 – 200 PPM

1 PPM

1 PPM 54-25-03 SO2 Sulfur dioxide 0 – 25 PPM 0.1 PPM 54-25-04† NH3 Ammonia (For software versions prior to 2. 0) 0 – 50 PPM 1 PPM 54-25-21† NH3 Ammonia 0 – 100 PPM 1 PPM 54-25-08 54-25-18 54-25-12 54-25-20 54-25-06 NO 54-25-09† NO

† ‡

ClO

† ‡

ClO

Chlorine (non-specific) 0 – 50 PPM 0.1 PPM Chlorine (specific) 0 – 50 PPM 0.1 PPM Chlorine dioxide (non-specific) 0 – 15 PPM 0.1 PPM

Chlorine dioxide (specif ic) 0 – 5 PPM 0.01 PPM

Nitric oxide 0 – 350 PPM 1 PPM

Nitrogen dioxide 0 – 50 PPM 0.1 PPM 54-25-10† HCN Hydrogen cyanide 0 – 100 PPM 0.2 PPM 54-25-13 PH

†

‡

target gas only.

Special reactive gas calibration adapt er (54-26-0405) r equired for proper calibration.

The non-s pec ific Cl2 and ClO2 sensors can be used for the detection of both gases. The specific Cl2 and ClO2 sensors are designed for the

Phosphine 0 – 20 PPM 0.1 PPM

Page 66

Appendix C Sensor Cross-Sensitivity Chart

The table below provides the cross-sensitivity response of the PhD Lite toxic gas sensors to common interference gases. The values are express ed as a percentage of the primar y sensitivity, or the reading of the s ensor when exposed to 100ppm of the inter fering gas at 20ºC. These values are approximate. The actual values depend on the age and condition of the sensor. Sensors should always be calibrated to the primary gas type. Cross-sensitive gases should not be used as sensor calibrati on surrogat es wit hout the express wri tten consent of Bio systems.

SENSOR

CO H2S SO2 NO NO2 Cl2 ClO2 H2 HCN HCl NH3C2H4C2H

Carbon Monoxide(CO)

100 10 5 10 -15 -5 -15 50 15 3 0 75 250

Carbon Monoxide (CO+)

100 350 50 30 -60 -60 -120 50 n/d n/d 0 75 250

Carbon Monoxide (CO-H)

100 10 5 n/d (-) (-) (-) 5 n/d n/d n/d (+) (+)

Hydrogen Sulfide (H2S)

0.5 100 20 2 -20 -20 -60 0.2 0 0 0 n/d n/d

Sulfur Dioxide (SO2)

1 1 100 1 -100 -50 -150 0.2 n/d n/d 0 (+) (+)

Nitrogen Dioxide (NO2)

-5 -8 -1 0 100 90 270 0 n/d n/d 0 n/d n/d

Chlorine (Cl2) (nonspecific)

0 -3 -1 0 110 100 310 0 n/d n/d 0 n/d n/d

Chlorine (Cl2) (specific)

0 -3 0 n/d 12 100 0 0 0 2 n/d 0 0

Chlorine Dioxide (ClO2) (nonspecific)

0 -1 -0.3 0 40 33 100 0 n/d n/d 0 n/d n/d

Chlorine Dioxide (ClO2) (specific)

0 0 0 n/d n/d 0 100 0 0 0 n/d 0 0

Ammonia (NH3) –21

0 <5 0 n/d 0 0 n/d 0 0 0 100 0 0

Ammonia (NH3) -04

0 130 70 15 -5 -50 -150 0 5 0 100 0 n/d

Phosphine (PH3)

0.5 25 20 n/d (-) (-) (-) 0.1 n/d n/d n/d 1 0.5

Hydrogen Cyanide (HCN)*

0.5 350 160 -5 -100 -20 -60 0.1 100 65 -5 50 n/d

n/d = no data, (+) undetermined positive, (-) undetermined negative

Sensor/CO2 Cross Sensitivity: The output of the O

sensor used in the PhD Lite will be enhanced by approximately 0.3% of signal per 1% of CO2.

*Reduced sulfur gases (H

S and SO2) are considered to be HCN sensor poisons. HCN sensors are not recommended for use in areas prone to sulfur gas presence.

Page 67

Appendix D Calibration Frequency

One of the most common questions that we are asked at Biosystems is:

“How often should I calibrate my gas detector?”

Sensor Reliability and Accuracy

Today’s sensors are designed to provide years of reliable service. In fact, many sensors are designed so that with norm al use they will only lose 5% of their sensitivity per year or 10% over a two-year period. Given this, it should be possible to use a sensor for up to two full years without any significant loss of sensitivity.

A lot of sensors indeed do last that long with only minimal loss of sensitivity. However, there are a number of reasons why a sensor may unexpectedly lose additional sensitivity or even fail to respond to gas. Such reasons include desiccation, poisoning, physical restriction of airflow, overexposure, leakage, and mechanical damage due to dropping or immersion.

Verification of Accuracy

With so many reasons why a sensor can lose sensitivity and given the fact that dependable sensors can be key to survival in a hazardous environment, frequent verification of sensor performance is paramount.

There is only one sure way to verify that a sensor can respond to the gas for which it is designed. That is to expose it to a known concentration of target gas and compare the reading with the concentration of the gas. This is referred to as a “bump” test. This test is very simple and takes only

a few seconds to accomplish. The

safest course of action is to do a “bump” test prior to each day’s use. It is not necessary to make a

calibration adjustment if the readings are between 90%* and 120% of the expected value. As an example, if a CO sensor is checked using a gas concentration of 50 PPM it is not necessary to perform a calibration unless the readings are either below 45 PPM or above 60 PPM.

** The Canadian Standards Association (CSA) requires the instrument to undergo calibration when the displayed value during a bump test fails to fall between 100% and 120% of the expected value for the gas.

Lengthening the Intervals between Verifications of Accuracy

We are often asked whether there are any circumstances in which the period between accuracy checks may be lengthened.

Biosystems is not the only manufacturer to be asked this question! One of the professional organizations to which Biosystems belongs is the Industrial Safety Equipment Association (ISEA). The “Instrument Products” group of this organization has been very active in developing a protocol to clarify the minimum conditions under which the interval between accuracy checks may be lengthened.

A number of leading gas detection equipment manufacturers have participated in the development of the ISEA guidelines concerning calibration frequency. Biosystems procedures closely follow these guidelines.

If your operating procedures do not permit daily checking of the sensors, Biosystems recommends the following procedure to establish a safe and prudent accuracy check schedule for your Biosystems instrum ents:

1. During a period of initial use of at least 10 days in the intended atmosphere, check the sensor response daily to be sure there is nothing in the atmosphere that is poisoning the sensor(s). The period of initial use must be of sufficient duration to ensure that the sensors are exposed to all conditions that might have an adverse effect on the sensors.

2. If these tests demonstrate that it is not necessary to make adjustm ents, the time between checks may be lengthened. The interval between accuracy checking should not exceed 30 days.

3. When the interval has been extended the toxic and combustible gas sensors should be replaced immediately upon warranty expiration. This will minimize the risk of failure during the interval between sensor checks.

4. The history of the instrument response between verifications should be kept. Any conditions, incidents, experiences, or exposure to contaminants that might have an

adverse effect on the calibration state of the sensors should trigger imm ediate re-verification of accuracy before further use.

5. Any changes in the environment in which the instrument is being used, or changes in the work that is being performed, should trigger a resum ption of daily checking.

6. If there is any doubt at any time as to the accuracy of the sensors, verify the accuracy of the sensors by exposing them to known concentration test gas before further use.

Gas detectors used for the detection of oxygen deficiencies, flammable gases and vapors, or toxic contaminants must be maintained and operated properly to do the job they were designed to do. Always follow the guidelines provided by the manufacturer for any gas detection equipment you use!

If there is any doubt regarding your gas detector's accuracy, do an accuracy check! All it takes is a few moments to verify whether or not your instrum ents are safe to use.

One Button Auto Calibration

While it is only necessary to do a “bump” test to ensure that the sensors are working properly, all current Biosystems gas detectors offer a one button auto calibration feature. This feature allows you to calibrate a Biosystems gas detector in about the same time as it takes to complete a “bump” test. The use of automatic bump test and calibration stations can further simplify the tasks, while automatically maintaining records

Don't take a chance

with your life.

Verify accuracy frequently!

Please read also Biosystems’

application note: AN20010808 “Use of ‘equivalent’ calibration gas mixtures”.

This application note provides procedures to ensure safe calibration of LEL sensors that are subject to silicone poisoning.

All of Biosystems Applications Notes are located on the Biosystems website at

http://www.biosystems.com

Page 68

Appendix E Biosystems Standard Warranty Gas Detection Products General

Biosystems LLC (hereafter Biosystems) warrants gas detectors, sensors and accessories manufactured and sold by Biosystems, to be free from defects in materials and workmanship for the periods listed in the tables below.

Damages to any Biosystems products that result from abuse, alteration, power fluctuations including surges and lightning strikes, incorrect voltage settings, incorrect batteries, or repair procedures not made in accordance with the Instrument’s Reference Manual are not covered by the Biosystems standard warranty.

The obligation of Biosystems under this warranty is limited to the repair or replacement of components deemed by the Biosystems Instrument Service Department to have been defective under the scope of this standard warranty. To receive consideration for warranty repair or replacement procedures, products must be returned with transportation and shipping charges prepaid to Biosystems at its manufacturing location in Middletown, Connecticut, or to a Biosystems Authorized Warranty Service Center. It is necessary to obtain a return authorization number from Biosystems prior to shipment.

THIS WARRANTY IS EXPRESSLY IN LIEU OF ANY AND ALL OTHER WARRANTIES AND REPRESENTATIONS, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO, THE WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE. BIOSYSTEMS WILL NOT BE LIABLE FOR LOSS OR DAMAGE OF ANY KIND CONNECTED TO THE USE OF ITS PRODUCTS OR FAILURE OF ITS PRODUCTS TO FUNCTION OR OPERATE PROPERLY.

Instrument & Accessory Warrant y P eriods

Product(s) Warranty Period

PhD

, PhD Lite, PhD Plus, PhD Ultra, Cannonball3, MultiVision, Toxi,

Toxi/Oxy Plus, Toxi/Oxy Ultra, ToxiVision, Ex Chek

As long as the instrument is in service

Toxi/Oxy Pro, MultiPro 2 years from date of purchase

2 years after activation or 2 years

Toxi Limited

after the “Must Be Activated By” date, whichever comes first

3 years after activation or 3 years after the

Toxi3Ltd®

“Must Be Activated By” date, whichever comes first

90 days after activation or 90 days

Mighty-Tox

after the “Must Be Activated By” date, whichever comes first

Mighty-Tox 2 Prorated credit is given towards repair or purchase of a new unit of the same type.

IQ Systems, Series 3000, Airpanel, Travelpanel, ZoneGuard, Gas9Chek1 and Gas9Chek4

0 – 6 months of use 100% credit 6 – 12 months of use 75% credit 12 – 18 months of use 50% credit 18 – 24 months of use 25% credit

One year from the date of purchase

Battery packs and chargers, sampling pumps and other components, which by their design are consumed or depleted during normal

One year from the date of purchase

operation, or which may require periodic replacement

Sensor Warranty Periods

Instrument(s) Sensor Type(s) Warranty Period

PhD Plus, PhD Ultra, PhD5, PhD Lite,

Cannonball3, MultiVision, MultiPro, ToxiVision, ToxiPro, Ex Chek

Toxi, Toxi/Oxy Plus, Toxi/Oxy Ultra

All Others All Sensors 1 Year

** Damage to combustible gas sensors by acute or chronic exposure to known sensor poisons such as volatile lead (aviation gasoline additive), hydride gases such as phosphine, and volatile silicone gases emitted from silicone caulks/sealants, silicone rubber molded products, laboratory glassware greases, spray lubricants, heat transfer fluids, waxes & polishing compounds (neat or spray aerosols), mold release agents for plastics injection molding operations, waterproofing formulations, vinyl & leather preservatives, and hand lotions which may contain ingredients listed as cyclomethicone, dimethicone and polymethicone (at the discretion of Biosystems Instrument Service department) void Biosystems’ Standard Warranty as it applies to the replacement of combustible gas sensors.

O2, LEL**, CO, CO+, H2S & Duo-Tox

2 Years

All Other Sensors 1 Year CO, CO+, H2S 2 Years All Other Sensors 1 Year

biosystems PhD Lite Reference Manual

Specifications and Main Features

Frequently Asked Questions

User Manual