Critical Environment Technologies LPT Operation Manual

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Operation Manual

www.critical-environment.com

LPT Economical Transmitter (Electrochemical Sensor)

Rev. C | 2013.06

LPT - Operation Manual Rev. C | 2013.06

TABLE OF CONTENTS

1 POLICIES ..........................................................................................................4

1.1 Important Note ................................................................................................4

1.2 Warranty Policy ................................................................................................5

1.3 Service Policy ...................................................................................................6

1.4 Copyrights ........................................................................................................7

1.6 Revisions ..........................................................................................................7

2 INTRODUCTION .............................................................................................8

2.1 General Description ..........................................................................................8

2.2 Key Features .....................................................................................................9

3 INSTRUMENT SPECIFICATIONS .................................................................10

3.1 Technical Specications ..................................................................................10

3.2 Standard Enclosure Dimensions .....................................................................12

4 SENSOR SPECIFICATIONS ...........................................................................13

4.1 Sensor Specications .....................................................................................13

4.2 Calibration Extending Firmware (CEF) and Sensor Aging................................15

5 FEATURES & FUNCTIONS ............................................................................16

5.1 Exterior Enclosure ..........................................................................................16

5.2 Interior System Layout ...................................................................................17

6 INSTALLATION ..............................................................................................18

6.1 Sensor Mounting Heights ...............................................................................19

6.2 Enclosure Mounting Components ..................................................................20

Enclosure Base ......................................................................................................... 20

Enclosure Bottom ..................................................................................................... 21

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6.3 Wiring Connections ........................................................................................21

Wiring Examples ...................................................................................................... 22

Wire Gauge vs Run Length ....................................................................................... 23

Open Loop................................................................................................................24

7 OPERATION ...................................................................................................24

7.1 System Operation ...........................................................................................24

7.2 Fault Detection...............................................................................................24

7.3 Test Functions ................................................................................................25

7.4 Jumpers .........................................................................................................25

Voltage & Gas Concentration Level Reference Table: ................................................28

8 CALIBRATION ................................................................................................28

8.1 Calibration Specications ...............................................................................28

Gas ........................................................................................................................... 28

Adapters ..................................................................................................................29

8.2 Calibrating Sensors ........................................................................................29

Calibration Frequency ..............................................................................................29

Gas Testing Frequency (Bump Testing) ..................................................................... 29

8.3 Calibration Procedure .....................................................................................30

9 ACCESSORIES ...............................................................................................33

9.1 Splash Guard ..................................................................................................33

9.2 Calibration Kit ................................................................................................33

9.3 Metal Protective Guard ..................................................................................34

11 TROUBLE SHOOTING ................................................................................36

LPT - Operation Manual Rev. C | 2013.06

1 POLICIES

1.1 Important Note

Read and understand this manual prior to using this instrument. Carefully read the warranty policy, service policy, notices, disclaimers and revisions on the following pages.

This product must be installed by a qualied electrician or trained technician and according to instructions indicated in this manual. This instrument should be inspected and calibrated regularly by a qualied and trained technician. For more information, refer to sections 10 Maintenance and 8 Calibration of this manual.

This instrument has not been designed to be intrinsically safe. For your safety, do not use it in classied hazardous areas (explosion-rated environments).

INSTRUMENT SERIAL NUMBER:

______________________________________________________

PURCHASE DATE:

______________________________________________________

PURCHASED FROM:

______________________________________________________

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1.2 Warranty Policy

• Disconnect power before servicing

• Supply: 24 V

Critical Environment Technologies Canada Inc. (CETCI), also referred to as the manufacturer, warrants this instrument to be free from defects in materials and workmanship for a period of two (2) years from the date of purchase.

Individual sensor elements have dierent warranties. Please check with the manufacturer for specic sensor warranty.

The warranty status may be aected if the instrument has not been maintained and calibrated as per the instructions indicated in this manual or has been abused or damaged in any way. The manufacturer is not liable for auxiliary interfaced equipment or consequential damage. This instrument is only to be used for purposes stated herein.

Warranty does not include third party trouble-shooting costs or freight to / from the manufacturer’s facility. CETCI’s liability is limited to replacement or repair of the equipment manufactured.

Due to ongoing research, development and product testing, the manufacturer reserves the right to change specications without notice. The information contained herein is based on data considered accurate. However, no warranty is expressed or implied regarding the accuracy of this data.

All goods must be shipped to the manufacturer by prepaid freight. All returned goods must be pre-authorized by obtaining a return merchandise authorization (RMA) number. Contact the manufacturer for a number and procedures required for product transport.

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1.3 Service Policy

CETCI maintains an instrument service facility at the factory. Some CETCI distributors / agents may also have repair facilities; however, CETCI assumes no liability for service performed by anyone other than CETCI personnel.

Repairs are warranted for 90 days after date of shipment (sensors have individual warranties).

Should your instrument require non-warranty repair, you may contact the distributor from whom it was purchased or you may contact CETCI directly.

Prior to shipping equipment to CETCI, contact our oce for an RMA #. All returned goods must be accompanied with an RMA number.

If CETCI is to do the repair work, you may send the instrument, prepaid, to:

Attention: Service Department Critical Environment Technologies Canada Inc. Unit 145, 7391 Vantage Way Delta, BC, V4G 1M3

Always include your Returned Merchandise Authorization (RMA) number, address, telephone number, contact name, shipping / billing information, and a description of the defect as you perceive it. You will be contacted with a cost estimate for expected repairs, prior to the performance of any service work.

For liability reasons, CETCI has a policy of performing all needed repairs to restore the instrument to full operating condition.

Pack the equipment well (in its original packing if possible), as we cannot be held responsible for any damage incurred during shipping to our facility.

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1.4 Copyrights

This manual is subject to copyright protection; all rights are reserved. Under international and domestic copyright laws, this manual may not be copied or translated, in whole or in part, in any manner or format, without the written permission of CETCI.

1.5 Disclaimer Under no circumstances will CETCI be liable for any claims, losses or damages resulting from or arising out of the repair or modication of this equipment by a party other than CETCI service technicians, or by operation or use of the equipment other than in accordance with the printed instructions contained within this manual or if the equipment has been improperly maintained or subjected to neglect or accident. Any of the forgoing will void the warranty.

1.6 Revisions

This manual was written and published by CETCI. The manufacturer makes no warranty or representation, expressed or implied including any warranty of merchantability or tness for purpose, with respect to this manual.

All information contained in this manual is believed to be true and accurate at the time of printing. However, as part of its continuing eorts to improve its products and their documentation, the manufacturer reserves the right to make changes at any time without notice. Revised copies of this manual can be obtained by contacting CETCI or visiting www.critical-environment.com.

Should you detect any error or omission in this manual, please contact CETCI at the following address:

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Critical Environment Technologies Canada Inc. Unit 145, 7391 Vantage Way, Delta, BC, V4G 1M3, Canada Toll Free: +1.877.940.8741 Telephone: +1.604.940.8741 Fax: +1.604.940.8745 Email: marketing@cetci.com Website: www.critical-environment.com

In no event will CETCI, its ocers or employees be liable for any direct, special, incidental or consequential damages resulting from any defect in any manual, even if advised of the possibility of such damages.

2 INTRODUCTION

2.1 General Description

Thank you for purchasing our LPT Low Power Transmitter for electrochemical sensor.

The LPT transmitters are rugged, user-friendly analog gas detection transmitter for use in nonhazardous (non-explosion rated) environments such as, commercial HVAC and light industrial applications.

A standard transmitter features a green colored LED indicating light for power and fault condition (refer to section 3.1 Technical Specications), an analog output signal and a standard water / dust tight enclosure.

Both carbon monoxide (CO) and nitrogen dioxide (NO2) electrochemical sensors are available for use with this gas detector and operate by diusion. The sensors utilized in this device are accurate enough to measure to Occupational Health & Safety (OHS) hazardous levels for toxic gases.

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If after reading through the manual, you have any questions, please do not hesitate to contact our service department for technical support.

2.2 Key Features

• 2-wire loop, 3-wire VDC or 4-wire VAC power

• Linear 4 - 20 mA output signal

• Standard water / dust tight enclosure (drip proof)

For splash or hosedown applications, add splash guard

• Single sensor: carbon monoxide (CO) or nitrogen dioxide (NO2)

• RoHS compliant circuit boards

• Easy maintenance

• Economical

• Includes sensor CEF (calibration extending rmware)

• Auto resetting fuse

• Automated calibration procedure

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3 INSTRUMENT SPECIFICATIONS

3.1 Technical Specications

GAS TYPE

Carbon Monoxide (CO)

Nitrogen Dioxide (NO2)

MECHANICAL

Enclosure ABS / Polycarbonate

Weight 400 g (14 oz)

Size 5.0” x 4.0” x 1.9” (127 mm x 102 mm x 48 mm)

ELECTRICAL

Power Requirement

2-wire mode 3-wire mode 4-wire mode

12 – 30 VDC, 1 Watt 12 – 30 VDC, 1 Watt 12 – 27 VAC, 1 VA

Use Class 2 transformer. See page 22.

Current Draw Maximum 25 mA

Outputs

Linear 4 - 20 mA Maximum 216 Ω load (wiring plus termination resistor) at 16 VDC Maximum 316 Ω load (wiring plus termination resistor) at 12 VAC

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Wiring

VDC two or three conductor shielded 18 awg stranded VAC four conductor shielded 18 awg stranded (refer to Wire Gauge vs. Run Length in section 6.3 Wiring Connections)

Fuse Automatic resetting thermal

Indicator

Solid Green: Power ON Flashing Green (50% duty cycle): Warm up Flashing Green (short OFF, long ON): Fault mode LED OFF: No Power or 4-20 mA “Open Loop” (unit won’t operate)

ENVIRONMENTAL (sensor dependant)

Operating Temperature -20°C to 40°C (-4°F to 104°F)

Operating Humidity 15 - 90% RH non-condensing

CERTIFICATION

CE Pending

C-Tick Pending

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3.2 Standard Enclosure Dimensions

1.91” (48.5 mm)

4.0” (101.6 mm)

5.0” (127 mm)

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4 SENSOR SPECIFICATIONS

4.1 Sensor Specications

Carbon Monoxide (CO)

Type Electrochemical

Range 0 - 200 ppm

Sensor Response Time (T90) 60 seconds

Operating Temperature -10°C to 60°C (14°F to 140°F)

Operating Humidity 5 – 95% RH non-condensing

Operating Pressure N/A

Repeatability < 2% of signal

Maximum Zero Shift N/A

Clean Air Output Drift < 10 ppm equivalent per year

Expected Life Span 6 - 7 years in air (under normal conditions)

Calibration Every 6 months or once a year (depending on application)

Cross Sensitivity H2S @ 20 ppm = < 0.1 ppm

NO2 @ 10 ppm = < 0.1 ppm Cl2 @ 10 ppm = < 0.1 ppm NO @ 50 ppm = < 5 ppm SO2 @ 20 ppm = < 0.1 ppm H2 @ 20°C (68°F) @ 400 ppm = < 60 ppm C2H4 @ 400 ppm = < 25 ppm NH3 @ 20 ppm = < 0.01 ppm

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Resolution 0.5 ppm

Nitrogen Dioxide (NO2)

Type Electrochemical

Range 0 - 10 ppm

Response Time (T90) < 30 seconds

Operating Temperature -20°C to 50°C (-4°F to 122°F)

Operating Humidity 15 – 90% RH non-condensing

Operating Pressure Atmospheric ± 10%

Resolution 0.02 ppm

Repeatability < 2% of signal

Maximum Zero Shift ± 0.2 ppm equivalent

Clean Air Output Drift < 2% signal loss / year

Expected Life Span 2 – 3 years in air (under normal conditions)

Calibration Every 6 months or once a year (depending on application)

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Cross Sensitivity H2S @ 20 ppm = < -40 ppm

Cl2 @ 10 ppm = 100 ppm NO @ 50 ppm = < 0.5 ppm SO2 @ 20 ppm = < -2.5 ppm CO @ 400 ppm = < 0.1 ppm H2 @ 400 ppm = < 0.1 ppm C2H4 @ 50 ppm = < 0.1 ppm NH3 @ 20 ppm = < 0.1 ppm CO2 @ 5% volume = < 0.1 ppm

NOTE: Response time will be slower with a splash guard installed.

4.2 Calibration Extending Firmware (CEF) and Sensor Aging

LPT systems with integral electrochemical sensors have been programmed with our CEF (Calibration Extending Firmware). This rmware takes into consideration the aging of the electrochemical CO and NO2 sensors so that less frequent calibrations are acceptable in non-critical applications such as parking garages. The system tracks the age of the sensor and automatically compensates for the reduced output of the sensor as it ages.

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5 FEATURES & FUNCTIONS

5.1 Exterior Enclosure

NUMBER FEATURE FUNCTION



Door Hinge Secures door



LED Indicator Indicates Power & Fail



Door Screw Secures door



Sensor Opening To monitor diused air and gas



Padlock Opening For padlock











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5.2 Interior System Layout

NUMBER FEATURE FUNCTION



Jumpers For calibrations & test functions



Test Points: TP-1 & TP-2 For measuring voltage output



Wiring Terminal Pluggable wiring terminal



Internal LED Calibration status indicator









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6 INSTALLATION

The LPT should be installed on a at vertical surface using the four 0.175” (4.4 mm) diameter mounting holes provided. Care should be taken to ensure that the face of the LPT is not obstructed in order to maximize the sensor’s exposure to the environment being monitored.

If LPT is to be installed in a potential “wash down” application or any application whereby liquid could be directed towards the sensor opening, the LPT should be ordered with an attached splash guard.

Two conduit entry points are provided in the ABS / Polycarbonate enclosure. Both are located in the enclosure base. One in the rear of the base and one on the bottom edge of the base. See photos on the following pages.

If used in a wet or wash down application, the conduit hub entering the LPT enclosure must be liquid tight type.

The clearance from the PCA to the base enclosure is ½” (12.7 mm). Do not use a conduit connector that has more than ½” (12.7 mm) thread.

NOTE: When mounting the enclosure, allow enough room to allow the end user to open the door fully to access the internal adjustments.

The door of the ABS / Polycarbonate enclosure can be removed if absolutely necessary to facilitate installation of the base but it is not recommended on this version. Extreme care and caution

must be exercised when removing the door to avoid damaging the hinges. The door should only be removed when absolutely required.

Simply grasp the door with one hand, being careful not to make contact with any of the internal components (circuit board), grasp the base with your other hand. Tug on the base and pull straight

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apart. DO NOT TWIST. The section of the hinges located on the base should “snap” apart from the part of the hinges located on the door.

After installation, simply locate the lid hinges over the installed base hinges and pull toward you. The hinges should easily “snap” back into place.

The ABS / Polycarbonate enclosure has one screw securing the door to the base for electrical safety and provides an opening to allow the user to apply a padlock or tie wrap if they desire the transmitter to be locked. See photo reference on preceding pages.

6.1 Sensor Mounting Heights

GAS APPLICATIONS / TYPES SUGGESTED MOUNTING HEIGHT

Carbon Monoxide (CO) Gas engine exhaust

4 - 6 ft from the oor

Nitrogen Dioxide (NO2) Diesel engine exhaust

NOTE: CETCI considers 4 - 6 ft from the oor as the “Breathing Zone” when it applies to sensors installed for vehicle exhaust applications.

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6.2 Enclosure Mounting Components

Enclosure Base

NUMBER FEATURE



Door Hinge



Conduit Entry



Mounting Holes













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Enclosure Bottom

NUMBER FEATURE



Door Hinge



Conduit Entry

6.3 Wiring Connections

The LPT series analog transmitter is a low voltage powered device. Any application of operating voltages higher than indicated in the specication may result in damage. Double check wiring connections prior to powering the transmitter. Damage from incorrect wiring connections or from too much voltage applied is not covered under warranty. Refer to Wiring Examples.

If the installer is powering the LPT with 24 VAC, both VAC wires should be connected to the terminal “one” and terminal “two”, from the top down. If the installer is powering the LPT with 24 VDC three wire, the “positive” wire should be connected to terminal “one” and the negative wire should be





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connected to terminal “three”. The “signal” wire is always connected to terminal “four”. With 24 VDC two wire the “Positive” wire should be connected to terminal “one’ and the “signal” wire is always connected to terminal “four.” Refer to Wiring Examples.

NOTE: DO NOT USE SOLID-CORE WIRE AT THE WIRING TERMINAL STRIP. The rigidity of solidcore wire can pull a soldered terminal strip completely o a circuit board “this will not be covered under warranty”.

System power: The main wiring terminal strip on the LPT circuit board can be unplugged

for easier wiring installation. Grasp the two sides of the terminal strip and pull sideways.

Wiring Examples

Device must be used with rated equipment. External power to LPT must be supplied by a Class 2 or better transformer. For loop-powered applications, the controller must conform to CSA, UL & CE safety standards.

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Wire Gauge vs Run Length

SUPPLY VOLTAGE

MAXIMUM LOAD

(Wire + Termination

Resistor) (ohms)

WIRE GAUGE (awg)

MAXIMUM CABLE

LENGTH (feet)

24 VDC 592

20 4,400

18 7,100

16 10,700

16 VDC

216 (assume a 200 Ω termination resistor)

20 700

18 1,200

16 1,800

24 VAC 1,060

20 27,100

18 43,200

16 65,500

12 VAC

316 (assume a 200 Ω termination resistor)

20 5,600

18 8,900

16 13,583

NOTES: The termination resistor could be as high as 500 Ω (10 volt measurement at 20 mA). A poor quality 24 VAC transformer might supply as little as 14 volts at low line conditions.

Upon application of power, the green LED light indicator will illuminate and will be ashing and the current output is xed at 4.0 mA for 5 minutes for a system warm up period. After the warm up period, the system may exhibit gas alarm condition if the sensor has not completely stabilized

LPT - Operation Manual Rev. C | 2013.06

during the warm up period. This is normal and the length of time the gas alarms exist is dependent upon the length of time since the unit was last powered up and the state of the environment it is installed in. After warm up the green power LED illuminates continuously indicating normal operation.

Open Loop

If the 4 - 20 mA signal loop has not been connected properly or has been damaged in some manner between the analog transmitter and the device to which it is sending its signal output, the LPT will not run or function at all. At this point, the wiring should be inspected for potential problems.

7 OPERATION

7.1 System Operation

Normal operation is indicated by a solid light on the external LED.

During normal operation, the gas level will be reported through the current loop, and a rough reading can be obtained from the voltage test points. The LED will remain solid when the device is in working order, and is not aected by gas concentration.

7.2 Fault Detection

The LPT has built in fault detection, and in the event of a problem with the measurement circuitry the transmitter will indicate a fault condition by ashing the external green LED (short OFF and long ON time). At this point, the transmitter will output 20 mA on the current loop. Normal operation will resume once the fault condition has been rectied.

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NOTE: While faults in the circuitry can be detected, a dead or damaged sensor will usually appear to the transmitter as a zero gas reading. To ensure safe operation, periodic bump tests are required.

7.3 Test Functions

During warm up and normal operation, the current loop and the voltage output can be tested by using Jumpers on J2 (refer to section 7.4 Jumpers).

Place the rst Jumper to set the gas output level (GAS3, GAS2, GAS1), then place the second Jumper to the OVER pins. The current output will match the corresponding span gas level, and will remain at that level for 5 minutes.

After 5 minutes, the unit will return to normal operation. Please return the Jumper placed on the OVER location back to IDLE when testing completed. (Refer to the table below for preset gas levels).

Voltage Output to Test Points “TP-1” and “TP-2”: NOTE: This output is intended as a rough indication of the gas level and has not been precisely

calibrated.

Attach the meter leads to the two test points (TP-1 & TP-2) located on the lower left corner on the back of the circuit board. Set the meter to volts DC with one decimal point. The range of 0 - 4.0 VDC is equal to the full measurement range of the sensor. Eg. HVAC CO sensor has a standard measurement range of 0 - 200 ppm. Therefore 4.0 VDC = 200 ppm.

7.4 Jumpers

There are two jumpers on J2 located at the back of LPT PCA. These jumpers allow the user to perform a range of set up, test and calibration functions.

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The following table details the jumper settings and explains the function enabled when these jumper positions are selected.

FUNCTION DESIRED J2 JUMPER-1 J2 JUMPER-2

Setting Span Gas Value (CO = 200 ppm, NO2 = 10 ppm)

GAS3 IDLE

Setting Span Gas Value (CO = 100 ppm, NO2 = 5 ppm)

GAS2 IDLE

Setting Span Gas Value (CO = 50 ppm, NO2 = 3 ppm)

GAS1 IDLE

Perform Zero (Null) and Span Calibration GAS1 or GAS2 or GAS3 CAL

To override the calibration if the zero and span value is over range high or low

OVER CAL

During warm up and normal mode, check the voltage and current output

GAS1 or GAS2 or GAS3 OVER

GAS1, Gas2 and GAS3 allows setting the calibration gas level. The OVER setting allows overriding the value if out of range during calibration but still at a “reasonable” value.

Jumper-2 allows setting the calibration and checking the voltage and current output.

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The three upper jumper’s (GAS1-GAS3) allow setting the calibration gas value. The OVER jumper setting allows overriding the value if out of range during calibration but still at a “reasonable” value.

Lower jumper set (CAL). This jumper allows setting the calibration and checking the voltage and current output.

Test Points: TP-1 & TP-2

NOTE: In this photo, the upper jumper (Jumper-1) is in the GAS3 position and the lower jumper (Jumper-2) is in the IDLE position. These are the default (factory set) locations.

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Voltage & Gas Concentration Level Reference Table:

SENSOR / GAS JUMPER-1 SETTING

GAS CONCENTRATION

LEVEL

VOLTAGE READING

GAS3 200 ppm 4.00 VDC

GAS2 100 ppm 2.00 VDC

GAS1 50 ppm 1.00 VDC

GAS3 10 ppm 4.00 VDC

GAS2 5 ppm 2.00 VDC

GAS1 3 ppm 1.20 VDC

8 CALIBRATION

8.1 Calibration Specications

Gas

Calibration span gases should have at least ± 5% accuracy and have a current date stamp. Gas generators should have a current dated cell installed. Service personnel should ow zero emissions air or 20.9% volume O2 (scrubbed of hydrocarbons) before attempting to null adjust toxic gas sensors. In some cases N2 can be substituted for zero air. Contact CETCI for clarication.

Regulators & Flow

Calibration gases that are lighter than or the same weight as air (CO, O2, etc.) should be owed at

0.5 LPM. Gases heavier than air (NO2, etc.) should be owed between 0.5 and 1.0 LPM. Fixed ow regulators provide more accuracy.

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Adapters

The proper calibration adapter should be utilized to allow the gas to properly diuse around the sensor. They are available from CETCI under part number CET-7000-CAP.

8.2 Calibrating Sensors

Calibration Frequency

• Parking garage detectors: Once every 12 months

• OHS applications: Once every 6 months (OHS: Occupational Health & Safety)

Gas Testing Frequency (Bump Testing)

For the purpose of safety in OHS applications, sensors should be gas tested (bump tested) once every month to conrm response and alarm activation.

NOTE: A calibration label should be applied after every calibration to conrm work performed and the date it was conrmed. If a controller is involved, the alarm set points should be indicated on a label on the front door of the enclosure so anyone working in the environment can be aware.

Required Equipment: Calibration kit, Calibration gases Optional: Digital multi-meter

Users can order the calibration kit, calibration accessories and / or gases from any CETCI authorized distributor or they can supply their own gas and equipment as long as the gas meets the minimum specications.

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8.3 Calibration Procedure

The calibration procedure within the LPT is jumper automated (there are no potentiometers to adjust). Monitoring the calibration with a volt meter is optional. The range of 0 - 4.0 VDC is equal to the full measurement range of the sensor. e.g. CO sensor has a standard measurement range of 0 - 200 ppm. Therefore, 4.0 VDC = 200 ppm.

To achieve calibration, the user must go through the following steps:

Step 1: Indicate what concentration of span gas used to ow over the sensor by putting Jumper-1 into gas position (GAS1, GAS2 or GAS3). Refer to Voltage and Gas Concentration Level Reference Table in section 7.4 Jumpers for standard gas concentration level.

If the reference table is unavailable, the gas level for each jumper position can be determined by placing Jumper-1 into one of the GAS positions and Jumper-2 into the OVER position. This will cause the LPT to output the corresponding signal on both the current loop and the voltage test points.

Step 2: Attach regulator to cylinder of zero air, insert calibration adapter into the sensor opening in the front of the enclosure door, and open regulator valve fully allowing zero air to ow over sensor for one minute.

Use a slight twisting motion as you gently push the calibration adapter into the sensor opening.

If the calibration adapter is hard to insert, moisten the O-ring seal slightly then try re-inserting it.

If the optional splash guard is installed, remove the center cap with a small at bladed screwdriver. Replace the center cap after calibration to restore splash proof performance.

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Step 3: Move the Jumper-2 on J2 to position “CAL”.

Step 4: If this level (possible residual gas) is too high, the internal LED will ash with a short OFF time and long ON time. This indicates that an override is needed. To override, move the Jumper-1 to the OVER position. If Jumper-1 is not moved to the OVER position in 30 seconds, the zeroing will be cancelled and will return to normal mode. After using the OVER position, Jumper-1 should be returned to the gas selection position (GAS1, GAS2 or GAS3).

Step 5: Once zeroed, the internal LED will rst ash 8 times, and then repeatedly ash 4 times and then pause with the LED o. This indicates that it is time to ow the gas.

If the digital multi-meter leads are attached to test points TP-1 and TP-2, the voltage should be 0.0 VDC.

Step 6: Attach regulator to cylinder of span gas.

Step 7: Insert the calibration adapter into the sensor opening in the front of the enclosure door.

Step 8: Open regulator valve fully and allow span gas to ow over sensor.

If no gas is detected after one minute, the transmitter returns to normal operation and the procedure will need to be performed from Step 2.

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Step 9: Once gas ow is detected, the internal LED pattern will change to ash four times and then pause with the LED on. During this time the current loop will follow the gas level based on the ideal span of the sensor.

The spanning can be cancelled by removing the Jumper-2 from the CAL position and move to IDLE position before the spanning is nished and the transmitter will return to normal operation (solid green light on the front).

Step 10: After the span is completed and passed, the transmitter will return to normal operation.

If the span is out of range but within the override range, the LED will ash as it did for zero override range. To override, move the concentration jumper to the OVER position. If Jumper-1 is not moved to the OVER position in 30 seconds, the current loop will output 20 mA and will stay there until you move the Jumper. After using the OVER position, Jumper-1 should be returned to the gas selection position (GAS1, GAS2 or GAS3).

If the sensitivity of the sensor is calculated out of range more than the OVER can compensate for, the internal LED will turn on solid, the front LED will remain o and the current loop will output 20 mA indicating the sensor cannot be calibrated. You can try to recalibrate, starting from step 2, to conrm the procedure was followed correctly and this may correct the fault.

If this does not correct the fault, please contact our service department at service@cetci.com.

To exit calibration mode, remove Jumper-2 from the CAL position and return it to the IDLE position.

If the digital multi-meter leads are attached to test points TP-1 and TP-2, the measured voltage will start moving towards the voltage calculated for the span gas value.

Rev. C | 2013.06 LPT - Operation Manual

9 ACCESSORIES

9.1 Splash Guard

9.2 Calibration Kit

Calibration kits and gases are available from the CETCI factory. Many gases are carried in inventory but not all. Check with any CETCI authorized distributor for availability of specic gas types. Gas cylinders cannot be shipped overseas. Part number CET-715A-CK1.

Splash guard attaches to the front of the enclosures. Factory installed only.

LPT - Operation Manual Rev. C | 2013.06

9.3 Metal Protective Guard

The metal protective guard is heavy duty metal protective guard to help protect against abrasive damage, theft and vandalism to the transmitters. This is an added preventative in addition to the product enclosure.

It is made from 16-gauge galvanized steel and has ½” (13 mm) square openings in the front to allow gas and air to ow through to the sensor. With only four slotted mounting holes, installation and removal for gas detector servicing is easy.

Enclosure 16 gauge galvanized steel

Weight 800 g (28 oz)

Size 7.0” W x 6.3” H x 3.6” D (178 mm W x 160 mm H x 91 mm D)

Rev. C | 2013.06 LPT - Operation Manual

10 MAINTENANCE

The LPT transmitter requires virtually no maintenance other than regular calibration of the sensor.

The transmitter should be monitored for possible damaging conditions.

1. The sensor port should be kept free of dirt or soot build up.

2. If in a damp location source of water should be shed from contacting the top of the transmitter.

3. If located in a working area the front of the transmitter should be kept clear.

4. If painting is to be conducted in the transmitters location the transmitter needs to be protected from over spray and the sensor port should not receive paint fumes – these fumes

may damage or reduce the life of the sensor.

LPT - Operation Manual Rev. C | 2013.06

11 TROUBLE SHOOTING

LPT won’t power up. (Outer LED is OFF)

Is the power properly connected? Refer to Wiring examples. 4 - 20 mA signal loop has not been connected properly. Check the connections.

Outer LED will ash with a short OFF time and long ON time and the current loop will output 20mA.

The LPT is in fault mode. If re-calibrating the sensor fails, replace the transmitter.

Outer LED will ash four times then pause.

The LPT is in Uninitialized mode. Return the LPT to factory.

During calibration, the internal LED will blink constantly.

Jumper-1 is missing. Install the jumper to desired gas concentration.

During calibration the internal LED will blink long ON and short OFF.

The sensor needs override. Move Jumper-1 to OVER position.

The internal LED turn solid green and the outside LED remains OFF.

It failed calibration. Try to recalibrate the sensor again.

LPT powered up (outer LED is ON) but the control panel will display “Fault”.

4 - 20 mA signal loop has not been connected properly. Check the connections and refer to wiring examples.

Rev. C | 2013.06 LPT - Operation Manual

NOTES

LPT - Operation Manual Rev. C | 2013.06

NOTES

Rev. C | 2013.06 LPT - Operation Manual

NOTES

Critical Environment Technologies Canada Inc.

Unit 145, 7391 Vantage Way, Delta, BC, V4G 1M3, Canada

Toll Free: +1.877.940.8741

Tel: +1.604.940.8741 Fax: +1.604.940.8745

www.critical-environment.com

Critical Environment Technologies LPT Operation Manual

Specifications and Main Features

Frequently Asked Questions

User Manual