MSA Chemgard Instruction Manual

Instruction Manual

Chemgard™ Infrared Gas Monitor

Order No.: 10031540/05

MSAsafety.com

THIS MANUAL MUST BE CAREFULLY READ BY ALL INDIVIDUALS WHO HAVE OR WILL HAVE THE RESPONSIBILITY FOR IN STALLING, USING OR SERVICING THE PRODUCT. Like any piece of complex equipment, this instrument will perform as designed only if it is installed, used and serviced in accordance with the manufacturer’s instructions. OTHERWISE, IT COULD FAIL TO PERFORM AS DESIGNED AND PERSONS WHO RELY ON THIS PRODUCT FOR THEIR SAFETY COULD SUSTAIN SEVERE PERSONAL INJURY OR DEATH.

The warranties made by Mine Safety Appliances Company with respect to the product are voided if the product is not used and serviced in accordance with the instructions in this manual. Please protect yourself and others by following them. We encourage our customers to write or call regarding this equipment prior to use or for any additional information relative to use or repairs.

WARNING

1000 Cranberry Woods Drive Cranberry Township, PA 16066 USA

Schlüsselstrasse 12 8645 Rapperswil-Jona Switzerland

For your local MSA contacts please go to our website www.MSAsafety.com

Permanent Instrument Warranty

1. Warranty- Seller warrants that this product

will be free from mechanical defect or faulty workmanship for a period of eighteen (18) months from date of shipment or one (1) year from installation, whichever occurs first, provided it is maintained and used in accordance with Seller’s instructions and/or recommendations. This warranty does not apply to expendable or consumable parts whose normal life expectancy is less than one (1) year such as, but not limited to, non-rechargeable batteries, filament units, filter, lamps, fuse released from all obligations under this warranty in the event repairs or modifications are made by persons other than its own or authorized service personnel or if the warranty claim results from physical abuse or misuse of the product. No agent, employee or representative of the Seller has any authority to bind the Seller to any affirmation, representation or warranty concerning the product. Seller makes no warranty concerning components or accessories not manufactured by the Seller, but will pass on to the Purchaser all warranties of manuf components. THIS WARRANTY IS IN

LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED OR STATUTORY, AND IS STRICTLY LIMITED TO THE TERMS HEREOF. SELLER

s etc. The Seller shall be

acturers of such

MSA

SPECIFICALLY DISCLAIMS ANY WARRANTY OF MERCHANTABILITY OR OF FITNESS FOR A PARTICULAR PURPOSE.

2. Exclusive Remedy- It is expressly agreed

that Purchaser’s sole and exclusive remedy for breach of the above warranty, for any tortious conduct of Seller, or for any other cause of action, shall be the repair and/or replacement at Seller’s option, of any equipment or part examination by Seller is proven to be defective. Replacement equipment and/or parts will be provided at no cost to Purchaser, F.O.B. Seller’s Plant. Failure of Seller to successfully repair any nonconforming product shall not cause the remedy established hereby to fail of its essential purpose.

3. Exclusion of Consequential Damage-

Purchaser specifically understands and agrees that under no circumstances will seller be liable to purchaser for economic, special, incidental or consequential damages or losses of any kind whatsoever, including but not anticipated profits and any other loss caused by reason of nonoperation of the goods. This exclusion is applicable to claims for breach of warranty, tortious conduct or any other cause of action against seller.

s thereof, which after

limited to, loss of

General Warnings and Cautions

WARNING

1. The monitor and Relay Module described in this manual must be installed, operated, and maintained in strict accordance with the labels, cautions, warnings, instructions, and within the limitations stated.

2. The standard and rack mount monitor must not be installed in outdoor areas or in locations where explosive concentrations of combustible gases or vapors might occur in the atmosphere: Class I, Group A, B, C, and D areas as defined by the NEC. Because the monitor is not explosion-proof, it must be located in non-

hazardous areas.

3. The explosion-proof (XP) Chemgard Monitor meets Class, I, Division 1, Groups B, C and D. To prevent ignition of a hazardous atmosphere, the cover of an XP monitor must be kept tightly closed when power is applied. Before removing the cover for maintenance or calibration, ensure the surrounding atmosphere is and remains free of toxic or combustible gases until the cover is closed.

4. The Chemgard Gas Monitor is designed to detect one particular gas or vapor at ambient atmospheric pressures. The unit will not dete

ct gas at elevated temperatures.

5. High levels of or long exposure to certain compounds in the tested atmosphere may contaminate the sensor. In atmospheres where the system may be exposed to such materials, perform calibration frequently to ensure dependable system operation and accurate indications.

6. Do not paint the Chemgard System. Also, do not paint near any of the sample line inlets to ensure paint is not deposited on the sample inlet fitting of the units. Such paint deposits would interfere with the sampling process, whereby a sample of the a

tmosphere being monitored is drawn into

the Chemgard System.

7. The only absolute method to assure the proper overall operation of a gas detection instrument is to check it with a known concentration of the gas for which it has been calibrated. Consequently, a calibration check must be included as part of the installation and as a routine inspection of the system.

8. Perform periodic leak checks on all the sample lines and all flow system components and fittings of t

he Chemgard System.

9. Use only genuine MSA replacement parts

10. Properly vent the exhaust of the Chemgard

11. Ensure the gas sample to the system is

12. Avoid any installation where condensation

13. The Chemgard Gas Monitor must be

14. The Chemgard Relay Module must be

15. Protect the Chemgard Relay Module from

16. Do not exceed the relay contact ratings listed

Failure to comply with the above warnings can result in serious personal injury or death.

Do not attempt to modify or adjust the sensing element.

when performing any maintenance procedures provided in this manual. Failure to do so may seriously impair instrument performance. Repair or alteration of the Chemgard System, beyond the scope of these maintenance instructions or by anyone other than authorized MSA service personnel, could cause the product to fail to perform as designed, and persons who rely on this product for their safety could sustain s

erious personal injury or death.

System to a safe area. Improper venting of the exhaust may cause serious personal injury or death.

clean and non-condensing. Install end-of-line filters in all sample inlet lines.

may form. Condensation may possibly clog or block the sampling line; this will prevent the instrument from receiving new or fresh gas samples from the area being monitored.

installed, located and operated in accordance to all applicable codes. These codes include, but are not limited to, the National Fire Prevention Code and National Electric Code.

connected to proper main voltages. Connection of improper voltages will cause the unit to fail. The Chemgard Relay Module uses the same electrical ground as the Chemgard Monitor.

vibration (which causes increased noise level on the instrument) and heating (which reduces the operating life of instrument); otherwise, improper operat

ion may occur,

which can result in personal injury or death.

in Appendix B, TABLE B-1 Otherwise, relay operation may fail, which can result in personal injury or death.

CAUTION

Standard Enclosure

Chemgard Infrared Gas Monitor

NOTE: The rack mount has not been tested by UL

and does not carry any UL approvals certification.

Chemgard Infrared Gas Monitor

Rack Mount

Chemgard Infrared Gas Monitor

Explosion-proof (XP)

Chemgard Infrared Gas Monitor

Table of Contents

TOC - 1

Table of Contents

Section 1

General Information .................................................................... 1-1

Introduction ................................................................................................................................................ 1-1

Table 1-1. Chemgard System General Operating Specifications ..................................................... 1-1

Identifying Your Unit ................................................................................................................................... 1-2

Multipoint Sequencer ........................................................................................................................... 1-2

Beacon ................................................................................................................................................ 1-2

Figure 1-1. Identifying Your Unit .................................................................................................... 1-2

Figure 1-2. Single Point Sequencer Unit ....................................................................................... 1-3

Figure 1-3. Four Point Sequencer Unit .......................................................................................... 1-3

Figure 1-4. Eight Point Sequencer Unit ......................................................................................... 1-3

General Description .................................................................................................................................... 1-4

The Chemgard Unit: ............................................................................................................................ 1-4

The Internal Multipoint Sequencer Unit: ............................................................................................... 1-4

e 1-5. Chemgard Gas Monitor with Optional Beacon ............................................................ 1-4

igur

Terminology ............................................................................................................................................... 1-5

Applications ................................................................................................................................................ 1-5

Sensor Selectivity* ..................................................................................................................................... 1-5

Table 1-2. Cross-Sensitivity Data for Carbon Monoxide ................................................................... 1-6

Table 1-3. Cross-Sensitivity Data for Ethylene Oxide ....................................................................... 1-6

Table 1-4. Cross-Sensitivity Data for Ethyl Alcohol ...........................................................................1-6

Table 1-5. Cross-Sensitivity Data for Hexane ................................................................................... 1-6

Table 1-6. Cross-Sensitivity Data for Cyclo-Pentane ........................................................................ 1-6

Table 1-7. Cross-Sensitivity Data for Toluene ................................

Table 1-8. Cross-Sensitivity Data for Methyle

Table 1-9. Cross-Sensitivity Data for Trichloroethylene .................................................................... 1-7

Table 1-10. Cross-Sensitivity Data for Xylenes ................................................................................. 1-7

Table 1-11. Cross-Sensitivity Data for Methanol ............................................................................... 1-7

Table 1-12. Cross-Sensitivity Data for Ethane .................................................................................. 1-8

Table 1-13. Cross-Sensitivity Data for Nitrous Oxide ........................................................................ 1-8

Table 1-14. Cross-Sensitivity Data for Acetone. ............................................................................... 1-8

Table 1-15. Cross-Sensitivity Data for Perchloroethyle

Table 1-16. Cross-Sensitivity Data for Perfluoromethylvinyl Ether .................................................... 1-8

Table 1-17. Cross-Sensitivity Data for Propylene Oxide ................................................................... 1-8

Table 1-18. Cross-Sensitivity Data for N-Pentane. ........................................................................... 1-9

Table 1-19. Cross-Sensitivity Data for Ethyl Ether ............................................................................ 1-9

Table 1-20. Cross-Sensitivity Data for Dimethylamine ...................................................................... 1-9

Table 1-21. Cross-Sensitivity Data for Nitrogen Trifluoride ............................................................... 1-9

Table 1-22. Cross-Sensitivity Data for C4F6 ..................................................................................... 1-9

ne Chloride ................................................................. 1-7

ne ................................................................. 1-8

................................................... 1-7

Table of Contents

Chemgard Infrared Gas Monitor

TOC - 2

Section 2

Installation and Set-up ................................................................. 2-1

Receiving ....................................................................................................................................................2-1

Unpacking the System ................................................................................................................................2-1

WARNING ......................................................................................................................... 2-1

Initial Inspection ....................................................................................................................................2-1

Location of the Monitor ................................................................................................................................2-1

WARNING......................................................................................................................................2-1

Instrument Location Guidelines ............................................................................................................2-1

Figure 2-1. Front Door Latches ......................................................................................................2-1

Guidelines for Locating the Sampling Point(s) .............................................................................................2-2

Activity in the Room ..............................................................................................................................2-2

CAUTION .......................................................................................................................................2-2

Mounting the Standard Enclosure Unit ..................................................................................................... 2-2

WARNING......................................................................................................................................2-2

Sample System Installation ..................................................................................................................2-2

WARNING......................................................................................................................................2-2

Figure 2-2. Mounting Dimensions

CAUTION .......................................................................................................................................2-4

Figure 2-3. Rack Mount Unit Mounting Dimensions ......................................................................... 2-4

Figure 2-4. XP Unit Mounting Dimensions ........................................................................................ 2-5

Wiring Connections .......................................................................................................................................... 2-6

Opening the Unit ........................................................................................................................................ 2-6

CAUTION .......................................................................................................................................2-6

Unit Power Wiring .................................................................................................................................2-6

CAUTION .......................................................................................................................................2-6

Analog Signal Output Wiring ..................................................................................................................... 2-6

Figure 2-5. Primary Power Wiring ..................................................................................................2-6

Figure 2-6. Wiring Connections .......................................................................................................... 2-6

Ferrite Bead Installation ............................................................................................................................ 2-7

CAUTION .......................................................................................................................................2-7

Relay Outputs .......................................................................................................................................2-7

Figure 2-7. Ferrite Bead Installation ................................................................................................... 2-8

CAUTION .......................................................................................................................................2-9

Initial Calib

Multipoint Sequencer Operation ...................................................................................................................... 2-9

ration ................................

WARNING ......................................................................................................................................2-9

................................

..........................................................................................................2-9

...................................................................... 2-3

Section 3

Display Screens ............................................................................ 3-1

Figure 3-1. Display Screen Overview ................................................................................................ 3-2

Figure 3-2. Start-up and Normal Operation Screens ........................................................................ 3-3

Figure 3-3. Set-up Screens .......................................................................................................... 3-4

Chemgard Infrared Gas Monitor

Table of Contents

TOC - 3

Figure 3-4. Span Calibration ........................................................................................................ 3-5

Figure 3-5. Zero Calibration ......................................................................................................... 3-5

Figure 3-6. Check Calibration ....................................................................................................... 3-6

Figure 3-7. Diagnostic Screens .................................................................................................... 3-6

Figure 3-8. Diagnostic Screens .................................................................................................... 3-7

Figure 3-9. Diagnostic Screens .................................................................................................... 3-7

Figure 3-10. Data Screens ........................................................................................................... 3-8

Figure 3-11. Sequencer Set-up Screen ........................................................................................ 3-8

Figure 3-12. Sequencer Set-up Screen ........................................................................................ 3-9

Figure 3-13. Alarm Level Screen .................................................................................................. 3-9

Figure 3-14. Alarm Latching Screen ........................................................................................... 3-10

Figure 3-15. Alarm Latching Screen ........................................................................................... 3-10

Figure 3-16. Audio Alarm Screen ............................................................................................... 3-11

Scree

Figure 3-17. Aux Alarm

Figure 3-18. Auxiliary Alarm Screen ........................................................................................... 3-13

Figure 3-19. Analog Output Screen ............................................................................................ 3-14

Figure 3-20. Setup Time ............................................................................................................. 3-15

Figure 3-21. Setup Log .............................................................................................................. 3-15

Figure 3-22. Setup Password ..................................................................................................... 3-16

Figure 3-23. Review Data .......................................................................................................... 3-16

Figure 3-24. Review Log ............................................................................................................ 3-17

Using the Wireless Remote Controller with the XP Unit ........................................................................... 3-18

CAUTION .................................................................................................................................... 3-18

Purpose ............................................................................................................................................. 3-18

General Operation and Usage ........................................................................................................... 3-18

Battery Installation and Replacement ................................................................................................ 3-18

CAUTION .................................................................................................................................... 3-18

Figure 3-25. Wireless Remote Contro

n .................................................................................................. 3-12

ller .................................................................................... 3-18

Section 4

Calibration .................................................................................... 4-1

Introduction ................................................................................................................................................ 4-1

Calibration Equipment. ............................................................................................................................... 4-1

Equipment needed: .............................................................................................................................. 4-1

Figure 4-1. Kit Components .......................................................................................................... 4-1

CAUTION ...................................................................................................................................... 4-2

Table 4-1. Calibration Gas Cylinders ................................................................................................ 4-2

For Carbon Monoxide, Carbon Dioxide and Nitrous Oxide Chemgard Monitors ........................................ 4-2

WARNING. ................................................................................................................................... 4-2

Chemgard Infrared Gas Monitor identification ............................................................................................ 4-2

Calibration Procedures ............................................................................................................................... 4-2

Table 4-2. Calibration Sequence Screens ........................................................................................ 4-3

Figure 4-2. Chemgard Models ....................................................................................................... 4-3

Figure 4-3. ZERO Calibration ........................................................................................................ 4-4

Fig

ure 4-4. Unit Span Calibration .................................................................................................. 4-4

Table of Contents

Chemgard Infrared Gas Monitor

TOC - 4

WARNING ..................................................................................................................................... 4-5

Figure 4-5. Unit Span Calibration .................................................................................................. 4-5

Figure 4-6. SPAN Calibration ........................................................................................................ 4-6

Figure 4-7. Unit Calibration Label .................................................................................................. 4-6

Section 5

Maintenance ................................................................................. 5-1

General Maintenance ................................................................................................................................. 5-1

Obtaining Replacement Parts .................................................................................................................... 5-1

WARNING ..................................................................................................................................... 5-1

Table 5-1. Replacement Parts ........................................................................................................... 5-1

Troubleshooting Guidelines ........................................................................................................................ 5-1

Table 5-2. Troubleshooting Guidelines ...................................................................................................5-3

Section 6

Data Logging ............................................................................... 6-1

Log Size ..................................................................................................................................................... 6-1

Last Values ................................................................................................................................................ 6-1

Number of Data Points Used ...................................................................................................................... 6-1

User Setup Options .................................................................................................................................... 6-1

Viewing Alarms/E

vents and Data ................................

............................................................................... 6-1

Appendix A

Check List .......................................................................................... A-1

pendix B

Relay Module ..................................................................................... B-1

General Description........................................................................................................................... B-1

Figure B-1. Relay Module .................................................................................................................... B-1

Specifications.................................................................................................................................................... B-2

Table B-1. Specifications ........................................................................................................................................................................................... B-2

Figure B-2. Mounting the Relay Module............................................................................................... B-2

Figure B-3. Relay Module Main Power Connector

and Communication Cable Connector Locations ................................................................................. B-2

Figure B-4. Chemgard Relay Module Power Wiring Diagrams for 120 Volts and 240 Volts AC .......... B-3

Figure B-5. Chemgard Infrared Gas Monitor Communication Cable Connections ............................... B-3

Unpacking the

Identifying the Unit ............................................................................................................................................ B-4

Table B-2. Part Numbers and Supplied Relays ...................................................................................................................................... B-4

Shi

pping Carton ........................................................................................................................ B-4

Figure B-6. Typical Interface Modules ....................................................................................... B-4

Chemgard Infrared Gas Monitor

Table of Contents

TOC - 5

Mounting Your ................................................................................................................................................... B-5

Electrical Connections for the Chemgard Relay Module .............................................................................. B-5

Main Power Connections ............................................................................................................................ B-5

WARNING ............................................................................................................................... B-5

CAUTION ................................................................................................................................. B-5

Communication Cable Connections ........................................................................................................ B-5

CAUTION ................................................................................................................................. B-5

WARNING ............................................................................................................................... B-5

WARNING ............................................................................................................................... B-6

CAUTION ................................................................................................................................. B-6

Operation ..................................................................................................................................................... B-6

Front Panel Indicators ............................................................................................................................. B-6

Chemgard Relay Module Relays ............................................................................................................. B-6

Applying Power ....................................................................................................................................... B-7

Alarm Relay Configuration ...................................................................................................................... B-7

Operation ................................................................................................................................................ B-7

Trouble Relay .......................................................................................................................................... B-7

Horn Operation ............................................................................................................... B-7

Reset Switch ...........................................................................................................................................

intenance ................................................................................................................................................................................................... B-8

Troubleshooting Guidelines ..................................................................................................................... B-8

Table B-3. Troubleshooting Guidelines ................................................................................................ B-8

Table B-4. Replacement Parts ............................................................................................................. B-8

B-8

Appendix C

RS-232 Output ............................................................................... C-1

Introduction ................................................................................................................................................... C-1

Table C-1. RS-232 Parameters ............................................................................................................. C-1

Table C-2. Information Structure (Chemgard Infrared Gas Monitor) ...................................................... C-1

Table C-3. Information Structure (Chemgard Infrared Gas Monitor) ...................................................... C-1

Table C-4. Data Structure ...................................................................................................................... C-2

Table C-5. Alarm Structure .................................................................................................................... C-2

Table C-6. Alarms and Events ............................................................................................................... C-2

RS-232 Output ................................

Remote Gas Sampling Channel ................................................................................................................... C-2

Table C-7. Voltage Output Corresponds to Channel .............................................................................. C-3

Password Protection (Remote Display Only) ................................................................................................ C-3

Figure C-1. RS-232 Location............................................................................................................ C-3

Figure C-2. Typical RS-232 Wiring ................................................................................................... C-4

Figure C-3. RS-232 Connector......................................................................................................... C-4

Figure C-4. Access to Switches ....................................................................................................... C-5

Figure C-5. Switch Bank Location .................................................................................................... C-5

Table C-8. Function of Switches ............................................................................................................ C-6

Figure C-6. Password Enabling Switches ........................................................................................ C-6

.......................................................................................................... C-2

Chemgard Infrared Gas Monitor

Section 1, General Information

1-1

REQUIREMENTS

RELAY

240 VAC, 8 amp resistive SPDT

RELAY

8 amps resistive SPDT

OUTPUTS

0-10 V, 2 K ohm load

OUTPUT

DRIVE OUTPUT

TRANSPORT AND STORAGE CONDITIONS

TYPICAL PERFORMANCE SPECIFICATIONS

5%-100% FS; +10% of reading

NOISE

(READY)

RESPONSE TIME

based on temperature at calibration

HUMIDITY

Section 1 General Information

Introduction

This manual provides instructions for the:

•

Chemgard Monitor

•

Chemgard unit with Multipoint Sequencer.

se instruments can provide continuous gas

The monitoring (see TABLE 1-1 for Operating Specifications).

NOTE: The

STABILITY

SHORT TERM

LINEARITY

WARM-UP TIME

TRANSPORT TIME

OPERATING TEMPERATURES

TEMPERATURE EFFECT

se units have not been evaluated for

performance by UL.

Table 1-1. Chemgard System

General Operating Specifications

0-5% full-scale (FS); +0.2% FS

+0.2% FS peak over a 10-minute peri

0-5% FS; +0.2% FS

5-100% FS, +10% of reading

24 hours maximum; typical, 20 minutes at 22°C (70 F) ambient

90% of a step-change in 70 seconds

500 FT (152 M) OF SAMPLING TUBING LENGTH

150 FT (46 M) OF SAMPLING TUBING LENGTH

C to 50oC (32oF to 122oF)

+0.3%/ temperature at calibration

+0.6%/oC of reading, 0 to 35 to 50oC

C of reading, 0 to 35oC based on

13 minutes for a 90% step change

105 seconds for a 90% step change

Table 1-1. Chemgard System

General Operating Specifications

TYPICAL PERFORMANCE SPECIFICATIONS

OPERATING PRESSURE

VOLTAGE RATING

POWER

TROUBLE

WARNING

CAUTION RELAY

ALARM REL AY

ANALOG

MAXIMUM OUTPUT SIGNAL LOAD FOR 4-20 MA

AUDIO ALARM

SAMPLE TUBING CONNECTIONS

DIMENSIONS

WEIGHT OF Chemgard WITH SEQUENCER

TEMPERATURE

HUMIDITY

ambient atmospheric

OPERATIN SPECIFICATIONS

100 to 240 VAC, 50-60 Hz

.88 amps at 120 VAC; 80 W, max .54 amps at 240 VAC; 80 W , max

Normally energized, Form C contact:

One relay, Form C contacts: 240 VAC,

One relay, Form C contacts: 240 VAC, 8

amps resistive SPDT

One relay, Form C contacts: 240 VAC, 8

amps resistive SPDT

4 to 20 mA sourcing, 1,000 ohm load,

1000 ohms (includes wiring)

10 VDC 20-ohm load maximum (available only with non-beacon models)

(6.35 mm) OD

1/4"

18" high, 16" wide, 7" deep

457.2 mm high, 406.4 mm wide,

177.8 mm deep

45 pounds (20 k

C to +70oC (-67oF to 158oF)

-55

99% RH non-condensing

ilograms)

RELATIVE

SAMPLE FLOW RATE

MAXIMUM SAMPLE OR EXHAUST TUBING LENGTH

0 to 95%, RH non-condensin

.75 liter per minute - minimum with maximum tubing length; typically 1.2 to 1.5 liters per minute with no tubing

150 feet (46 m) with 1/8" (3.18 mm) ID tubing, 1/4" (6.35 mm) OD (total of Inlet & Outlet); 500 feet (152 m) with 0.18" (4.57 mm) ID tubing

For the C Appendix B, "Relay Module."

*This un Laboratories, Inc.

hemgard Remote Relay* option, see

it has not been evaluated by Underwriters

Section 1, General Information

Chemgard Infrared Gas Monitor

1-2

The monitor uses infrared sensing technology, allowing accurate measurement of Gas vapors with minimum interference from other vapors. Your Chemgard unit is factory-calibrated for a specific Gas. It is extremely sensitive. The unit monitors the signal and can operate three alarm levels at a software-selectable gas concentration values. There is also a trouble indication to alert the operator when something is wrong with the unit.

The unit monitors only one zone or location, but your instrument may contain a Multipoint Sequencer capable of monitoring up to four or eight different zones or locations. To determine the number of sampling locations your particular unit is able to count the number of inlet ports at the bottom of the case (FIGURE 1-2, 1-3 or 1-4).

monitor, careful

ly tilt the unit and

Beacon

Identifying Your Unit

Multipoint Sequencer

The Chemgard Gas Monitor is capable of monitoring differen each unit is factory-calibrated to detect one type of Gas. Check the label inside the front door to determine what gas your unit is designed to detect (FIGURE 1-1). For specific guidelines on using the RS232 function (serial communication port), see Appendix C.

t types of gases. However,

The op unit (FIGURE 1-5). It is powered by the monitor’s internal DC voltage.

End of Sample Line Filters

End of sample l unit operation; they may be included in the shipping carton.

If the end of s included, they must be purchased.

tional beacon is mounted on top of the

ine filters are required for proper

ample line filters are not

Fig

ure 1-1. Identifying Your Unit

Chemgard Infrared Gas Monitor

Section 1, General Information

1-3

gure 1-2. Single Point Sequencer Unit

Fig

ure 1-3. Four Point Sequencer Unit

Figure 1-4. Eight Point Sequencer Unit

Section 1, General Information

Chemgard Infrared Gas Monitor

1-4

Figure 1-5. Chemgard Gas Monitor with Optional Beacon

General Description

The Chemgard Unit:

•

Monitors gases from parts-per-billion (ppb) to % level

•

Operates on the photo-acoustic principle, allowing gas concentration measurement in comp

lex mixture of background gases

•

Allows gas detection in applications where contaminants or interferants preclude use of other techniques

•

Provides a digital display; if it is a multi-point monitor, it also shows the point number currently being sampled by the unit

•

Is also used for applications requiring long-term stability and low maintenance

•

Is factory-calibrated to the full scale value of gas

•

Is compensated for the relative humidity of the gas to give excellent zero stability.

•

Operates over a wide temperature range

•

Has front-panel windows for viewing:

- Gas concentration

- Diagnostics

- Alarm Conditions

•

Is highly selective to enable operation in:

- Areas with varying humidity

- Areas containing other contaminants.

•

Comes standard with:

- Four sets of relay contacts

- Two com

•

One input: 4-20 mA, assignable to the ALARM relay.

•

RS 232 output (see Appendix C for more informati

pletely i

on).

ndependent outputs: 0-10 V 4-20 mA

The Internal Multipoint Sequencer Unit:

•

Allows a single Chemgard unit to monitor up to four or eight areas or locations, if equipped

Chemgard Infrared Gas Monitor

Section 1, General Information

1-5

• Each point is capable of sampling from

remote areas up to 500 feet (152 m) from the Chemgard unit

• Contains all necessary flow components

(excluding end-of-line filter and sampling line) to properly sample four or eight areas and indicate the gas or vapor concentrations.

Terminology

Become familiar with the following terminology.

ZERO- A zero (0) indication on the meter

display usually indicates fresh air (no gas present).

ZEROING- The process of placing a zero gas on

the unit during calibration.

SPAN- Full-scale or up-scale reading on

meter display.

SPANNING-

span gas on the unit during calibration.

SPAN GAS VALUE- The gas concentration that

gives the instrument a full-scale or up-scale value. This value is printed on the calibration gas cylinder containing the gas.

FLOW RATE- Volume of gas drawn through the

sample line per minute.

EXHAUST GAS- Sample gas after it passes

through the sensor.

PUMP- The electric motor driven device that

moves the gas sample to the Chemgard Monitor.

ALARMS- The Chemgard System has three alarms

to alert the concentrations. (Level 1 = Caution, Level 2 = Warning and Level 3 = Alarm.)

RELATIVE HUMIDITY- The percent of water vapor

saturation in air at a given temperature.

POINT NUMBER- The location or area from which

a gas sample is drawn. Up to four or eight areas, sequentially numbered from 1 to 8, can be sampled.

BYPASS- The Sequencer is a look-ahead system;

bypass gas flow is drawn from the next area to be sampled. This feature reduces the monitor response

FRESH AIR- Air that has no possibility of

containing gas.

TEMPERATURE EFFECT- The gas response

displayed by the instrument (PPM) can change ±0.3% for each degree (C) that the instrument is operating above/below the temperature at which the instrument was last calibrated.

The process of placing a full-scale or

user at specific, user-adjustable gas

time when long sampling lines are used.

Applications

The Chemgard Monitor is factory-calibrated for a particular gas. When calibrated, the Chemgard System is used in a wide variety of industrial applications, such as:

• detection of gases leaking into the atmosphere

• ambient air monitoring for health and

safety purposes

Sensor Selectivity*

The Chemgard Gas Monitor is factory-calibrated for your particular gas (TABLE 1-3). The system is highly selective to gases in air; however, the system also responds to other gases (interferants). See TABLES 1-2 through 1-22* for typical cross-sensitivities. Actual cross-sensitivities vary from instrument to instrument.

If it is not known whether the gas to be detected is an interferant gas, contact MSA at:

*Typical cross-sensitivities not verified or investigated by UL.

1-800-MSA-INST.

Section 1, General Information

Chemgard Infrared Gas Monitor

1-6

GAS

CONCENTRATION

ETO READING

METHANE

2.5%

R12

100 ppm

R22

100 ppm

R123

100 ppm

267

R124

100 ppm

R134a

100 ppm

PENTANE

0.75%

198

BUTANE8%109

ISO-BUTYLENE

100 ppm

TEST CONDITIONS:

Temperature - 25oC

CYCLO-PENTANE

READING

METHANE

1000 ppm

250

CARBON DIOXIDE

CARBON MONOXIDE

ETHANOL

100 ppm

NITROUS OXIDE

100 ppm

R11

100 ppm

R22

100 ppm

R123

1000 ppm

R134a

100 ppm

ACETONE

944 ppm

206

METHANOL

1059 ppm

394

TEST CONDITIONS:

Temperature: 25oC

ETHYL

READING

R11

100 ppm

337

R22

100 ppm

R113

100 ppm

150

R12

100 ppm

407

R123

100 ppm

AMMONIA

50 ppm

METHANE1%0

PROPANE

185

METHANOL

1060 ppm

487

ACETONE

954 ppm

TEST CONDITIONS:

Temperature: 25oC

Table 1-2.

GAS

CONCENTRATION

CO READING

GAS

CONCENTRATION

HEXANE

CARBON DIOXIDE

METHANE

2.5%

METHANE

1000 ppm

211

PENTANE

0.75%

CARBON DIOXIDE

2500 ppm

PROPANE

2.0%

110

CARBON MONOXIDE

500 ppm

AMMONIA

880 ppm

ETHANOL

100 ppm

HYDROGEN SULFIDE

ISO-BUTYLENE

100 ppm

METHANOL

1000 ppm

NITROUS OXIDE

100 ppm

Acetone

1000 ppm

R11

100 ppm

TOLUENE

1000 ppm

R123

1000 ppm

R11

100 ppm

R134a

100 ppm

TEST CONDITIONS:

ACETONE

944 ppm

174

METHANOL

1059 ppm

332

TEST CONDITIONS:

Temperature: 25oC

Cross-Sensitivity Data for Carbon Monoxide

Table 1-5.

Cross

-Sensitivity Data for Hexane

Cylinder P/N 80

6734, 100 ppm CO in nitrogen,

available as a span gas; see Calibration

procedure for details

40 ppm 0

Calibrated 0-1000 PPM CO in N Temperature: 25oC

Table 1-3.

Cross-Sensitivity Data for Ethylene Oxide

Cylinder P/N 80

4870, 100 ppm R-113 in Nitrogen,

available as a simulant span gas; see Calibratio

procedure for details

Cylin

der P/N 10014894, 1000 ppm Pentane in air,

available as a simulant span gas; see

Calibration procedure for details

Calibrated 0-1000 PPM Hexane in N

Table 1-6.

Cross-Sensitivity Data for Cyclo-Pentane

Cylin

der P/N 494450, 100 ppm Isobutylene in air,

available as a simulant span gas; see

Calibration procedure for details

Calibrated 0-1000 PPM Ethylene Oxide in N

Table 1-4.

Cross-Sensitivity Data for Ethyl Alcohol

Cylin

der P/N 804532, 0.75% Pentane in air,

available as a simulant span gas; see Calibration

procedure for details

GAS CONCENTRATION

Calibrated 0-1000 PPM Ethyl Alcohol in N

ALCOHOL

GAS CONCENTRATION

2500 ppm 0

500 ppm 0

Calibrated 0-1000 PPM Cyclo-Pentane in N

Chemgard Infrared Gas Monitor

Section 1, General Information

1-7

METHYLENE

READING

R11

100 ppm

R12

100 ppm

R22

100 ppm

R113

100 ppm

R134a

100 ppm

ISO-BUTYLENE

100 ppm

ETHANOL

100 ppm

AMMONIA

100 ppm

R123

100 ppm

METHANE

1.25%

TEST CONDITIONS:

Temperature: 25oC

METHANOL

READING

METHANE

1.25%

PROPANE

.6%

PENTANE

1000 ppm

ISO-BUTYLENE

100 ppm

NITROUS OXIDE

100 ppm

R11

100 ppm

280

R12

100 ppm

185

R123

100 ppm

R134a

100 ppm

TEST CONDITIONS:

Temperature: 25oC

TRICHLORO-

READING

R11

100 ppm

R12

100 ppm

285

R22

100 ppm

R113

100 ppm

R123

100 ppm

NITROUS OXIDE

100 ppm

ISO-BUTYLENE

100 ppm

AMMONIA

50 ppm

METHANE

1.25%

TEST CONDITIONS:

Temperature: 25oC

Table 1-7.

TOLUENE

GAS

CONCENTRATION

XYLENES

R12

100 ppm

R12

100 ppm

R22

100 ppm

R22

100 ppm

R113

100 ppm

R113

100 ppm

R123

100 ppm

R134a

100 ppm

R134a

100 ppm

CARBON MONOXIDE

5000 ppm

NITROUS OXIDE

100 ppm

AMMONIA

100 ppm

ETHANOL

50 ppm

METHANE

5000 ppm

750

AMMONIA

50 ppm

NITROUS OXIDE

100 ppm

TEST CONDITIONS:

CARBON MONOXIDE

60 ppm

TEST CONDITIONS:

Temperature: 25oC

Cross-Sensitivity Data for Toluene

Cylin

der P/N 10014894, 1000 ppm Pentane in air,

is available as a simulant span gas; see

Calibration procedure for details

Table 1-10

Cross-Sensitivity Data for Xylenes

Cylin

der P/N 494450, 100 ppm Iso-butylene in

air, available as a simulant span gas; see

Calibration procedure for details

GAS CONCENTRATION

Calibrated 0-1000 PPM Toluene in N

Table 1-8.

Cross-Sensitivity Data for Methylene Chloride

Cylinder P/N 80

4532, 0.75% Pentane in air,

available as a simulant span gas; see

Calibration procedure for details

GAS CONCENTRATION

CHLORIDE

Calibrated 0-1000 PPM Xylenes in N

Table 1-11.

Cross-Sensitivity Data for Methanol

Cylinder P/N 80

4868, 100 ppm R-22 in nitrogen,

available as a simulant span gas; see

Calibration procedure for details

GAS CONCENTRATION

Calibrated 0-1000 PPM Methylene Chloride in N

Table 1-9.

Cross-Sensitivity Data for Trichloroethylene

Cylinder P/N 80

4532, 0.75% Pentane in air,

available as a simulant span gas; see

Calibration procedure for details

GAS CONCENTRATION

Calibrated 0-1000 PPM Trichloroethylene in N

ETHYLENE

Calibrated 0-1000 PPM Methanol in N

Section 1, General Information

Chemgard Infrared Gas Monitor

1-8

NITROUS

OXIDE READING

R134a

100 ppm

R113

100 ppm

ISO-BUTYLENE

100 ppm

PROPANE

.6%

R22

100 ppm

CARBON DIOXIDE

2.5%

115

PENTANE

1000 ppm

METHANE

1.25%

CARBON MONOXIDE

BUTANE

450

TEST CONDITIONS:

Temperature: 25oC

PERFLUOROMETHYL-

VINYL ETHER READING

R142B

100 ppm

ISOBUTYLENE

PROPANE

.6% 3

R23

100 PPM 4

ACETATE

PENTANE

1000 PPM 0

METHANE

2.5%

R218

100 PPM

BUTANE

TEST CONDITIONS:

Temperature: 25oC

ACETONE

READING

R12

100 ppm

615

R22

100 ppm

420

R123

100 ppm

465

ISO-BUTYLENE

100 ppm

CARBON MONOXIDE

HYDROGEN

.6%

NITROUS OXIDE

100 ppm

AMMONIA

50 ppm

METHYL ETHYL KETONE

TEST CONDITIONS:

Temperature: 25oC

PROPYLENE

OXIDE READING

R12

100 ppm

820

R113

100 ppm

775

PROPANE

.6%

290

R22

100 ppm

245

NITROUS OXIDE

100 ppm

PENTANE

1000 ppm

METHANE

1.25%

HYDROGEN

0.8%

OXIDE

TEST CONDITIONS:

Temperature: 25oC

Table 1-12. Cross-Sensitivity Data for Ethane

GAS

CONCENTRATION

ETHANE READING

PERCHLORO-

READING

R12

100 ppm

R22

100 ppm

R123

100 ppm

CARBON

60 ppm

R11

100 ppm

R22

100 ppm

HYDROGEN

.6%

R113

100 ppm

NITROUS OXIDE

100 ppm

NITROUS OXIDE

100 ppm

R134a

100 ppm

R134a

100 ppm

R11

100 ppm

ACETONE

100 ppm

TEST CONDITIONS:

Temperature: 25oC

TEST CONDITIONS:

Temperature: 25oC

Cylinder P/N 494450, 100 ppm Iso-butylene in

air, available as a simulant span gas; see

Calibration procedure for details

Table 1-15.

Cross-Sensitivity Data for

Perchloroethylene

Cylinder P/N 804532, 0.75% Pentane in air,

available as a simulant span gas; see

Calibration procedure for details

Calibrated 0-1000 PPM Ethane in N

Table 1-13. Cross-Sensitivity Data

for Nitrous Oxide

Cylinder P/N 806736, 100 ppm Nitrous Oxide in

Nitrogen, is available as a span gas; see

Calibration procedure for details

GAS CONCENTRATION

Calibrated 0-1000 PPM Perchloroethylene in N

ETHYLENE

Table 1-16. Cross-Sensitivity Data for

Perfluoromethylvinyl Ether

Cylinder P/N 803500, 100 ppm R134a in

Nitrogen, available as a simulant span gas; see

Calibration procedure for details

GAS CONCENTRATION

ETHYL

100 ppm

1000 PPM 185

60 ppm 10

Calibrated 0-1000 PPM Nitrous Oxide in N

Table 1-14. Cross-Sensitivity Data for Acetone

Cylinder

P/N 803499, 100 ppm R11 in Nitrogen,

available as a simulant span gas; see

Calibration procedure for details

GAS CONCENTRATION

300 ppm 0

140 ppm 85

Calibrated 0-1000 PPM Acetone in N

Calibrated 0-1000 PPM Perfluoromethylvinyl Ether in N

Table 1-17. Cross-Sensitivity Data

for Propylene Oxide

Cylinder P/N 494450, 100 ppm Iso-butylene in

air, available as a simulant span gas; see

Calibration procedure for details

GAS CONCENTRATION

PROPYLENE

Calibrated 0-1000 PPM Propylene Oxide in N

100 ppm 100

Chemgard Infrared Gas Monitor

Section 1, General Information

1-9

ETHYL ETHER

READING

METHANE

2.5%

R11

100 ppm

R12

100 ppm

141

R123

100 ppm

184

R134a

100 ppm

166

R113

100 ppm

121

ISO-BUTYLENE

100 ppm

TEST CONDITIONS:

Temperature: 25oC

CONCENTRATION

(PPM)

DIMETHYLAMINE

READING

METHANE

2.5%

R11

100 ppm

R12

100 ppm

534

R123

100 ppm

590

R134a

100 ppm

701

R113

100 ppm

457

ISO-BUTYLENE

100 ppm

TEST CONDITIONS:

Temperature: 25oC

GAS

CONCENTRATION

C4F6 READING

C4F8

50 ppm

C5F8

50 ppm

CARBON MONOXIDE

R22

50 ppm

METHYLENE CHLORIDE

AMMONIA

50 ppm

ETHANOL

50 ppm

IPA

50 ppm

METHYL FLUORIDE

NITROUS OXIDE

50 ppm

SF6

50 ppm

NITROGEN TRIFLUORIDE

R32

50 ppm

TEST CONDITIONS:

Temperature: 25oC

Table 1-18. Cross-Sensitivity Data for N-Pentane

READING

NITROGEN

READING

R134a

100 ppm

R123

1000 ppm

ISO-BUTYLENE

100 ppm

CARBON DIOXIDE

NITROUS OXIDE

100 ppm

R123

100 ppm

R22

100 ppm

ETHANOL

100 ppm

R134a

R11

100 ppm

PENTANE

1000 ppm

1000

METHANE

1000 ppm

200

R22

100 ppm

PROPANE

0.6% ppm

CARBON DIOXIDE

METHANE

2.5% ppm

PENTANE

0.75% ppm

CARBON MONOXIDE

ISO-BUTYLENE

100 ppm

C5F8

50 ppm

TEST CONDITIONS:

Temperature: 25oC

METHYL FLUORIDE

C4F6

50 ppm

SF6

50 ppm

120

C4F8

50 ppm

TEST CONDITIONS:

Temperature: 25oC ppm

Cylinder P/N 10014894 1000 ppm Pentane in

Air, available as a simulant span gas; see

Calibration procedure for details

GAS CONCENTRATION

2500 ppm 0

500 ppm 0

N-PENTANE

Table 1-21. Cross

-Sensitivity Data for

Nitrogen Trifluoride

Cylinder P/N 804532 0.75% Pentane in Air,

available as a simulant span gas; see Calibration

procedure for details

GAS CONCENTRATION

300 ppm 0

TRIFLUORIDE

Calibrated 0-1000 PPM N-Pentane in N

Table 1-19. Cross-Sensitivity Data for

Ethyl Ether

Cylin

der P/N 804868, 100 ppm R-22 in Nitrogen,

available as a simulant span gas; see

Calibration procedure for details

GAS CONCENTRATION

Calibrated 0-1000 PPM Ethyl Ether in N

Table 1-20. Cross-Sensitivity Data for

Dimethylamine

Cylin

der P/N 804868, 100 ppm R-22 in Nitrogen, available as a simulant span gas; see

Calibration procedure for details

50 ppm 0

Calibrated 0-1000 PPM Nitrogen Trifluoride in N

Table 1-22. Cross-Sensitivity Data for C4F6

Cylinder P/N 812784 30 ppm R123 in Nitrogen,

available as a simulant span gas; see Calibration

procedure for details

50 ppm 0

GAS

Calibrated 0-1000 PPM Dimethylamine in N

Calibrated 0-1000 PPM C4F6 in N

Chemgard Infrared Gas Monitor

Section 2, Installation and Setup

2-1

Section 2 Installation and Set-up

Receiving

Upon receipt of the unit, inspect the shipping carton for signs of visible damage. Report any damage to the carrier and note it on the delivery receipt. The unit must be stored in a dry, secure place prior to its installation and use. Store unit in the original shipping carton.

Unpacking the System

To unpack the equipment:

1. Carefully remove the Chemgard Monitor from its shipping container(s) in order to prevent damage to sensitive electrical components. If any damage is found, report it to the shipper

Do not install or operate a damaged unit. It may not function properly and may not alert you to any gas conditions.

2. Search through all packing material and containers to avoid inadvertently discarding usable or valuable parts. Report any shortages immediately to MSA.

The contents of the shipping carton are:

•

Retain original packing form for re-use in the event the unit must be returned for service.

3. Using a screwdriver, loosen the two latches on the Chemgard door (FIGURE 2-1) by turning 1/4 turn counterclockwise.

4. Open the front door.

Initial Inspection

With the front door open, carefully inspect components and assemblies inside the enclosure. If damage or shortage is evident, advise and promptly file the proper claim with the carrier.

immediately.

WARNING

instrument

manual

end-of-line filters (may be purchased separately).

Location of the Monitor

This unit must not be located in areas that may contain a flammable mixture of gas and air; otherwise, an explosion may occur.

The monitor performance is dependent on its location and sensing pick-up location(s). Follow the guidelines listed below before mounting the monitor.

Instrument Location Guidelines

1. Select a location where personnel will see the front panel or the optional beacon before they enter the equipment room or the area where the monitoring point is located.

2. Mount the unit vertically; do not mount the unit to structure shock, such as piping and piping supports.

3. Do not locate the unit near an excessive heat source or in wet and damp locations.

Figure 2-1. Front Door Latches

WARNING

s subject to vibration and

Section 2, Installation and Setup

Chemgard Infrared Gas Monitor

2-2

4. Do not mount the unit where it will be

Gu S

Du la indi lo ( u li

T c

Con t

reduce transport time.

CAUTION

exposed to direct solar heating.

5. For proper cooling, allow at least three inches (76.2 mm) clearance around all surfaces except for the mounting surface.

6. Mount unit so the front panel is easily seen and accessed for service and calibration.

idelines for Locating the

ampling Point(s)

e to the wide variation in equipment room

youts, each situation must be analyzed

vidually. A sampling point may be remotely

cated up to 150 feet (46 m) from the monitor

500 feet [152 m] if 0.180" [4.57 mm] I.D. tubing is

sed) in an area where gas vapors are most

kely to leak or accumulate.

OTE: The 150 and 500 feet (46 and 152 m)

allowances refer to the total sample and exhaust line length for each sample point.

ctivity in the Room

he expected activities in the room must also be onsidered when determining the sensing point.

OTE: Select sampling locations which result in the

shortest possible line length in order to reduce transport time.

sider the following guidelines when selecting

he location for the sampling point(s).

1. Place the end of the sampling line in an area that provides the instrument with a representative sample; ventilation Smoke Tubes (P/N 458480) are useful in determining air flow patterns in ambient sampling areas.

2. Properly exhaust the instrument to a safe area or to outside atmosphere.

3. Ensure the sampling area is free of particulate matter and condensing moisture; ensure sample lines will not draw moisture up into the line.

NOTE: The sample gas must be

adequately filtered before entering the instrument. End-of-sample-line filters must be used with the unit. These filters must be installed at the end of all sample lines.

4. Ensure the end of the sampling line is unobstructed to allow the sample to flow freely to the instrument.

5. Keep sample lines as short as possible to

Ensure that tubing radii are wide enough to prevent kinking or bending. Otherwise, an obstruction may occur, preventing the instrument from sampling the intended area.

6. DO NOT:

• back-pressure the exhaust line or

• connect it to a vacuum source or

• install a flow meter in the exhaust line.

ALWAYS :

connect an exhaust line that is vented to a safe area or an

outside atmosphere.

Mounting the Standard Enclosure Unit

The instrument has four mounting lugs (FIGURE 2-1). Securely mount the unit to a wall or support, using appropriate hardware.

Do not mount the unit directly to a source which may affect the operation of the monitor, resulting in incorrect readings.

WARNING

Sample System Installation

1. Remove all caps on the sample inlets and exhaust of the Chemgard Monitor

(FIGURE 2-2).

Failure to remove any caps from the unit gas inlet or exhaust fittings prevents gas sampling and may cause an undetected toxic and hazardous gas build-up and a flow trouble indication.

2. Route the 1/4" (6.35 mm) OD tubing into the areas to be monitored.

3. After the line(s) are installed and BEFORE they are connected to the monitor:

a. Clean lines with compressed air or

nitrogen to remove any debris.

b. Perform a leak-check to assure they are

free of leaks.

c. Connect the line(s) to the sample port(s)

on the monitor.

d. Install the end-of-line filters.

NOTE: All unused sample inlet(s) must be

WARNING

plugged or have an end-of-line filter installed to avoid debris entering the unit. To disable these unused lines, refer to the setup screen shown in FIGURE 3-11.

Chemgard Infrared Gas Monitor

Section 2, Installation and Setup

2-3

Figure 2-2. Mounting Dimensions

Section 2, Installation and Setup

Chemgard Infrared Gas Monitor

2-4

NOTE: The Rack Mount version has not been tested by UL for performance

and does not carry any approvals certification

Figure 2-3. Rack Mount Unit Mounting Dimensions

4. Install all tubing ends to the inlet fittings of the unit. Mark the location identity of each individual tubing on the tubing or on the inside of the instrument itself (FIGURE 2-2).

5. Connect the exhaust fitting to tubing which is

Ensure that each and every sample tubing has an end-of-line filter on it; otherwise, damage to the internal components may result.

routed to an area where gases may be safely dispersed.

CAUTION

Chemgard Infrared Gas Monitor

Section 2, Installation and Setup

2-5

NOTE: The XP version has not been tested by UL for performance.

Internal grounding terminal shall be used as the equipment grounding means and the external ground terminal is only a supplemental bonding connection where local authorities permit or require such a connection.

Figure 2-4. XP Unit Mounting Dimensions

Section 2, Installation and Setup

Chemgard Infrared Gas Monitor

2-6

Wiring Connections

Opening the Unit

All wiring to the Chemgard unit is made via the side entries. Open the unit to provide complete access to all wiring connections.

Ensure that all wiring codes are followed. These codes include, but are not limited to, the National Electrical Code.

Do not open the Chemgard door unless equipment is protected from splashing, spraying, or dripping water; otherwise, damage to internal components may result.

Unit Power Wiring

A separate, dedicated power source is recommended for the Infrared Gas Monitor to ensure that the unit remains powered when other circuits are shut down for servicing, routine maintenance or shift changes.

The monitor uses a wide range power supply which can accept AC power from 100 to 240 volts, 50 or 60 Hz. The power wiring should en the unit through one of the openings on the right side of the enclosure. Connections are made to the screw terminals labeled L1, L2, ACN and GND, located in the upper right side of the unit (FIGURE 2-5). The maximum wire size that these connectors can accept is #12 AWG.

The incoming power provided to the monitor determines the configuration of the fuse(s) and wiring to the main power terminal block. FIGURE 2-5 shows the fuse and wire connections for various voltages.

Power Supply Wiring

1. Using a screwdriver, loosen the two latches on the enclosure door (FIGURE 2-1).

2. Open the front door.

3. Determine the power requirements for your Chemgard unit, ensuring the power is clean and reliable. (Refer to TABLE 1-1 for current capacity specifications.)

CAUTION

ter

Figure 2-5. Primary Power Wiring

Wiring the Chemgard Unit

4. Route power wiring through one of the entries in the side of the unit.

NOTE: Power wiring should be separated

from relay wiring.

5. For single fuse 100/120 Volts AC power connection, connect the:

•

power wire to L1

•

neutral wire to ACN

•

ground wire to terminal

6. For double fuse 220/240 Volts AC power connection, connect power wires to L1 and L2 and ground wire to terminal.

Analog Signal Output Wiring (FIGURE 2-6)

The Chemgard unit has two available analog outputs. Each analog output is software-selectable between 10or 100% of full scale:

If unsure of your power available, contact your facility engineer or safety officer. If incorrect power is applied, damage may occur to the instrument.

CAUTION

Figure 2-6. Wiring Connections

Chemgard Infrared Gas Monitor

Section 2, Installation and Setup

2-7

• 4-20 mA, isolated, current sourcing

• 0-10 VDC

These voltage and current outputs are proportional to the displayed gas concentration. Connections are made to terminal strip J17 located on the lower left side of the main circuit board (FIGURE 2-6). Analog output wiring should enter the unit through the hole provided on the left side of the unit. The terminal portion of the connector can be removed from the circuit board for easier connection. The maximum wire size

that these connectors can accept is Listed #12 AWG; the maximum cable length is 500 feet (152 m).

It is suggested that Listed #18 AWG, twisted-pair wire be used. If shielded wire is necessary, ground the shields of all cables at the receiving end of the signal. Do not ground or connect the shields at the Chemgard Monitor.

4-20 mA

The 4-20 mA output sources current to a separate return. Connections are made to terminals 2 (I+) and 3 (RTN) on terminal strip J17.

1-10 VDC

The 0-10 VDC output sources voltage to 2 K ohms maximum load. Connections are made to terminals 4 (V+) and 5 (COM) on terminal strip J17.

The voltage output can be programmed to correspond to the channel presently being sampled. The front-panel screen shows:

1V/PT IF OUT = 1-10V

(indicating one volt per point

if output equals one to 8 volts).

When enabled, and the unit is monitoring from:

• channel 1:

voltage output is one volt

• channel 2:

voltage output changes to two volts.

RS 232 Output

• See Appendix C for wiring information.

Ferrite Bead Installation

Some models are shipped with ferrite beads. Follow the instructions below for proper installation.

• Input and output signals must be connected

by using twisted, shielded wire pairs.

• The shield or its drain wire (FIGURE 2-7)

must be connected to the grounding terminal on the power supply plate.

• Each unit is supplied with Thora-Electronik

#16-28-9 or equivalent ferrite (P/N 10017468).

• The shield must also be connected to ground

at the receiving equipment.

• The RS 485 communications lines to a relay

module must be wired in a similar manner. See Appendix B for more information on t

relay module.

CAUTION

Bundle low voltage wiring together (lower than 30 volts), separate from high voltage wiring (higher than 30 volts); otherwise, incorrect readings could occur.

Optional Alarm Beacon

Your unit may have an optional alarm kit installed. This kit is made up of a beacon on the top of the unit. It is factory-wired so no additional wiring is necessary; it lights when any alarm indication is given by the instrument. This function parallels the audible alarm output (when the horn sounds, the beacon lights).

Relay Outputs

Alarm Relays

There are three alarm relay outputs:

•

Caution (factory-set to trip at 9 ppm)

•

Warning (factory-set to trip at 29 ppm)

•

Each relay can be set up as latching/non-latching and/or normally-energized/normally de-energized. Contacts are Form C at 240 Volts AC 8 amps resistive. Connect wiring to Terminal Strip J29. User can adjust alarm trip points via the front panel (see Section 3, FIGURE 3-13).

Alarm Relay Connections Wiring

Three gas level alarm relay outputs are provided. All alarm relays are Form C, SPDT relays which can be wired to either closed or opened contacts in an alarm condition.

Each relay has contacts for:

The function of each relay connector terminal is indicated on FIGURE 2-6. Relay wiring should enter the unit through one of the openings on the right side of the unit. Connections are made at the internal terminal strip labeled J29, located on the right side of the circuit board (FIGURE 2-6). The terminal portion o unplugged from the circuit board for easier wire connections.

Alarm (factory-set to trip at 700 ppm)

• NORMALLY OPEN (NO)

• COMMON (COM)

• NORMALLY CLOSED (NC)

f the connector can be

Section 2, Installation and Setup

Chemgard Infrared Gas Monitor

2-8

Ferrite Bead Installation

NOTE: The maximum wire size that these

connectors can accept is #12 AWG.

Trouble Relay

There is one relay (the Trouble relay) within the unit that indicates that a trouble or start-up condition exists. This relay is configured from the factory and operates differently than the alarm relays. It operates in a normally-energized mode.

This relay is energized when the instrument is:

• normally operating,

• in the calibration mode, or

• in the setup condition.

The relay is de-energized when:

• a fault is detected,

• the unit is in the start-up state, or

• the main power is lost.

This means that power is no longer provided to the relay coil. It is not possible to change the configuration of the Trouble relay.

Figure 2-7.

The relay connector function or identification:

as marked in FIGURE 2-6 refers to the relay contacts as if the relay is de-energized or in the trouble condition. A relay contact is provided between the Normally Clo (COM) position. This contact will be made in the event that main power to the unit is lost or any other trouble condition exists.

Trouble Relay Connection Wiring

The Trouble relay wiring should enter the unit through one of the entries on the right side of the unit. Connections are made at the internal terminal strip labeled J29, positions 1, 2 and 3 (located on the right side of the circuit board FIGURE 2-6). The terminal portion of the connector can be unplugged from the circuit board for ea wire size that these connectors can accept is #12 AWG.

• NORMALLY OPEN (NO),

• COMMON (COM),

• NORMALLY CLOSED (NC)

sed (NC) and Common

sier wire connections. The maximum

Chemgard Infrared Gas Monitor

Section 2, Installation and Setup

2-9

Remote Reset

The audible alarm and latched gas level alarms can be remotely reset through a switch that has a momentary contact opening (normally closed set of contacts). Connections are made to terminal strip J16, terminals 1 and 2 with the wiring entering the enclosure through the hole on the left side of the instrument. The switch must have signal-level contacts, typically gold plated. The maximum distance from the reset switch to the monitor, using 18 AWG wire, is 250 feet (76 m). The maximum wire size that these connectors can accept is #12 AWG.

Audible Alarm Output

An output is provided to drive the piezo-electric horn on the bottom of the unit (FIGURE 1-5). This output is available for customer use, provided that the beacon is not installed.

Auxiliary Input - Use UL Listed Devices

A 4-20 mA analog input can be made to the monitor from another device such as another Infrared Gas Monitor or an oxygen monitor. The input wiring should be brought into the enclosure through the hole on the left side of and connected to terminals 3 (AUX) and 4 (GND) on terminal strip J16. It is recommended that Listed #18 AWG, twisted pair wire be used; maximum wire length is 250 feet (76 m). The maximum wire size that these connectors can accept is Listed #12 AWG. Shielded wire is necessary. Ground the shields of all cables at the transmitting end of the signal. Do not ground or connect the shield at the Chemgard Monitor.

the instrument

CAUTION

All field wiring must be done in accordance with national and local electrical codes.

Initial Calibration

Calibrate after installation; otherwise, false or erroneous readings can result.

The initial calibration is the same as the routine calibration. Refer to Section 4 for this procedure.

WARNING

Multipoint Sequencer Operation

In the sequencer setup screens, unneeded points can be de-activated by using the RIGHT ARROW key and selecting the point to be de-activated.

• When the change key is pressed, the number

in the display goes blank.

• After pressing OK, the display shows a dark

diamond to indicate which points are

de-activated (see FIGURE 3-11).

In the sequencer setup screens, the monitor can be locked on a single point by pressing CHANGE before the RIGHT ARROW key.

• After pressing the RIGHT ARROW key and

OK, only the selected point is indicated.

• After an hour (if no buttons are pushed),

the monitor returns to normal sequencer operation (see FIGURE 3-12).

When calibrating:

• the gas inlet point can be selected.

• an inactive point can be selected.

After leaving calibration:

• the monitor returns to the previous sequencer

setup (see FIGURE 3-4).

Chemgard operation with a sequencer has a normal dwell time of 30 seconds per sample line, or three measurement cycles.

To improve monitor performance in noisy environments and eliminate false alarms due to high noise, a user-selectable parameter "threshold" was established.

• The factory value for this threshold is 30%.

•

The threshold value is used with the Caution Alarm setpoint to determine when additional readings must be made on the current sample line to confirm actual concentration at the sample point.

•

The allowable adjustment range for the threshold value is 30% t

• If this value is greater or equal to the product

of the threshold and the Caution Alarm value, the monitor dwells for an additional 70 seconds or seven more measurement cycles.

o 70%.

Chemgard Infrared Gas Monitor

Section 3, Display Screens

3-1

Section 3 Display Screens

Before applying power to the Chemgard Infrared Gas Monitor, follow the Appendix A check list. This will help ensure that the instrument is properly configured for operation.

All instrument operation is performed via the front panel which consists of four keys and a two-line by 20-character vacuum fluorescent display. There is no reason to open the unit for set-up, calibration or diagnostic testing of the instrument. The most commonly used, self-explanatory screens appear on the following pages. Simply follow th screen menus. The step-by step approach guides you through each operation.

e on-

• The Display Screen Flow Overview

(FIGURE 3-1) shows a general system function flow. See the following FIGURES for specific Display Screen details:

•

Start-up and Normal Operation Screens (FIGURE 3-2)

•

Calibration Screens (FIGURES 3-4 through 3-6)

•

Information Screens (FIGURES 3-7 through 3-10 and FIGURES 3-23 and 3-24)

•

Set-up Screens (FIGURES 3-3 and 3-11 through 3-22).

Section 3, Display Screens

Chemgard Infrared Gas Monitor

3-2

Figure 3-1. Display Screen Overview

Chemgard Infrared Gas Monitor

Section 3, Display Screens

3-3

Figure 3-2.

Start-up and Normal Operation Screens

Section 3, Display Screens

Chemgard Infrared Gas Monitor

3-4

Figure 3-3

Set-up Screens

Chemgard Infrared Gas Monitor

Section 3, Display Screens

3-5

Figure 3-4

Span Calibration

Figure 3-5

Zero Calibration

Section 3, Display Screens

Chemgard Infrared Gas Monitor

3-6

Figure 3-6

Check Calibration

Figure 3-7

Diagnostic Screens

Chemgard Infrared Gas Monitor

Section 3, Display Screens

3-7

Figure 3-8

Diagnostic Screens

Figure 3-9

Diagnostic Screens

Section 3, Display Screens

Chemgard Infrared Gas Monitor

3-8

Figure 3-10

Data Screens

Sequencer Set-up Screen

Figure 3-11

Chemgard Infrared Gas Monitor

Section 3, Display Screens

3-9

Figure 3-12

Sequencer Set-up Screen

Figure 3-13

Alarm Level Screen

Section 3, Display Screens

Chemgard Infrared Gas Monitor

3-10

Fig

ure 3-14

Alarm Latching Screen

Figure 3-15

Alarm Latching Screen

Chemgard Infrared Gas Monitor

Section 3, Display Screens

3-11

Figure 3-16

Audio Alarm Screen

Section 3, Display Screens

Chemgard Infrared Gas Monitor

3-12

Fig

ure 3-17

Aux Alarm Screen

Chemgard Infrared Gas Monitor

Section 3, Display Screens

3-13

Figure 3-18

Auxiliary Alarm Screen

Section 3, Display Screens

Chemgard Infrared Gas Monitor

3-14

Figure 3-19

Analog Output Screen

Chemgard Infrared Gas Monitor

Section 3, Display Screens

3-15

Figure 3-20 Setup Time

Figure 3-21

Setup Log

Section 3, Display Screens

Chemgard Infrared Gas Monitor

3-16

Figure 3-22

Setup Password

Figure 3-23

Review Data

Chemgard Infrared Gas Monitor

Section 3, Display Screens

3-17

Figure 3-24

Review Log

Section 3, Display Screens

Chemgard Infrared Gas Monitor

3-18

Figure 3-25. Wireless Remote Controller

Chemgard Infrared Gas Monitor

Section 3, Display Screens

3-19

Using the Wireless Remote Controller with the XP Unit

• The four Controller keys correspond to the

same four pushbuttons shown in the Display Screens.

• The Calibrator mimics these buttons via an

infrared link through the front-panel window.

• Point the Controller at the front-panel window

and push the appropriate key to obtain the desired front-panel function indicated on the display.

CAUTION

Do not use the Wireless Remote Controller without fully reading and understanding all operating instructions, labels, cautions, warnings, and literature supplied with this equipment. Failure to do so may result in property damage, severe bodily injury or death.

Purpose

The Wireless Remote Controller Transmitter provides a source of digitally encoded infrared energy for control of the Chemgard XP unit. Its primary use is in hazardous and/or high security areas where the wireless commands can effect instrument adjustment and contr

ol without

breaking safety or security seals.

General Operation and Usage

Infrared energy is transmitted from the upper center portion of the device when any one of the four selector buttons is pressed. Although the infrared transmission is not visible, operation is indicated when the TRANSMIT LED is ON. A flickering TRANSMIT LED is normal, and corresponds to the encoded message. Power is consumed by the Transmitter only when one of the four buttons is pressed. Most visibly transparent material will signals.

also pass these infrared

Aim the red lens on the end of the Transmitter at the target device, the desired function key is pressed, and the RECEIVE LED on the target turns ON to verify the infrared message is received.

NOTE: If more than one button is pressed

simultaneously, the RECEIVE ACKNOWLEDGE LED will turn ON, but there can be no other response; this mode serves as a test function only.

To ensure reliable operation, hold the Transmitter no more than 12 inches (304.8 mm) from the targe

t assembly, and point the red lens of the transmitter at the RECEIVE ACKNOWLEDGE LED. The range will be restricted in direct sunlight or extremely high illumination areas.

Battery Installation and Replacement

Perform the following in a known safe area.

CAUTION

1. Remove the four screws from the bottom and carefully open the case, keeping the top in close proximity to the bottom so as not to strain the interconnecting cable. Retain the front plastic shield that is loosely held by the top and bottom slots.

2. Note the polarity markings inside the holder, and install a 9 Volt Alkaline Duracell, Inc. MN1604 or an Eveready No. 522 type battery in the battery holder. Properly dispose of the battery.

3. Before re-assembling the case, individually press each of t

he four keys, and verify that the TRANSMIT LED lights in a blinking pattern.

4. If it has been removed, place the front plastic shield into its lower slot, and carefully align it with the corresponding slot in the top cover.

5. Re-install the four screws.

Chemgard Infrared Gas Monitor

Section 4, Calibration

4-1

Section 4 Calibration

Introduction

As with any type of gas monitor, the only true check of its performance is to apply gas directly to the sensor. The frequency of the calibration gas test depends on the operating time and exposures of the sensors. New monitors should be calibrated more often until the calibration records prove stability. The calibration frequency can then be reduced to the schedule set by the safety officer or plant manager.

Perform the calibration procedure regularly and maintain a log of calibration Calibration frequency may increase for a variety of reasons. If calibration cannot be performed at any step, STOP; consult MSA at 1-800-MSA-INST.

adjustments.

Calibration Equipment

Equipment needed:

• Calibration Kit (MSA ATO #50; FIGURE 4-1)

Item 1 - Tube and Tee Assembly

Item 3 - Connector Assembly (P/N 711533)

(P/Ns 603806 and 636866)

Item 5 - Zero Gas Scrubber (P/N 803873)

NOTE: Replace protective caps after use

Figure 4-1.

Kit Components

Item 2 - 1.5 LPM Flow Controller (P/N 478358)

Item 4 - Span Gas Scrubber (P/N 803874)

NOTE: Replace protective caps after

use.

Section 4, Calibration

Chemgard Infrared Gas Monitor

4-2

DESCRIPTION

CONCENTRATION

PART NO.

Pentane

.75%

804532

Iso Butylene

100 ppm

494450

Nitrous Oxide

100 ppm

806736

R134a

100 ppm

803500

Carbon Dioxide

100 ppm

806755

R12

100 ppm

804866

Propane

0.6%

493579

• A SPAN gas cylinder

• Optional ZERO gas cylinder.

•

A ZERO gas cylinder may not be needed.

The Calibration Kit contains a ZERO gas scrubber which can be used in place of a ZERO gas cylinder if the ambient air around the Chemgard Infrared Gas Monitor contains little or no interfering gas.

The zero gas scrubber must be replaced periodically because the filter can become saturated by ambient gas vapors. The frequency of replacement depends on the concentration of the ambient gas vapors.

The SPAN or ZERO cylinders (if needed) may be included with the Calibration Kit; cylinders shown in TABLE 4-1 are available from MSA:

Table 4-1. Calibration Gas Cylinders

Carbon Monoxide 100 ppm 806734

Pentane 1000 ppm 10014894

R22 100 ppm 804868

R11 100 ppm 803499

Zero Air

R113 100 ppm 804870

R134a 30 ppm 812787

R123 30 ppm 812784

CAUTION

801050

Become familiar with the Calibration Kit components (FIGURE 4-1).

For Carbon Monoxide, Carbon Dioxide and Nitrous Oxide Chemgard Monitors

An affect observed on these infrared monitors is a reduction in signal at low relative humidities. The gas sample being drawn into the instrument MUST contain a humidity level greater than 0.3% by volume. At 72°F (22°C), this would represent a relative humidity level of approximately 10%.

To ensure that the sample is humidified, MSA recommends placing an air-tight water bubbler in the sample line. I

f the humidity level in the sample stream will be above 0.3% by volume at all times, the water bubbler is not necessary. Care MUST be used to ensure that sufficient water is present in the bubbler such that the humidity level is greater than 0.3% by volume at all times, including during calibration.

Failure to properly humidify the sample at all times can cause erroneous monitor readings. If the instrument is not properly humidified, the Chemgard Monitor may fail to perform as designed and persons who rely on this product for their safety could sustain severe personal injury or death.

Calibration of the infrared sensor can be achieved by following the calibration procedure in this manual. The sample MUST be properly humidified during the calibration procedure.

WARNING

Chemgard Infrared Gas Monitor identification

You must identify your unit as a single-point monito

r or a multi-point monitor for proper calibration gas connection. Refer to FIGURE 4-2 to help identify your unit.

Calibration Procedures

Before calibrating the Chemgard Monitor, leak-check the sample line(s) connected to the monitor:

1. Temporarily block the sample inlet at the end-of-line filter(s) and verify that the monitor gives a trouble alarm.

•

If the monitor is a Multipoint Sequencer, the trouble alarm will not activate until the blocked sampling point is selected by the Sequencer.

2. After checking for leaks, remove the sampling line for the Chemgard inle

•

On Multipoint Monitors,

use sample inlet Point 1.

3. Attach the Calibration Kit connector assembly to the inlet.

4. Before applying gases, familiarize yourself with the calibration screens by stepping the monitor through the whole sequence. Press the keys in the following order:

Chemgard Infrared Gas Monitor

Section 4, Calibration

4-3

PRESS

RESULT

ANY KEY

BRINGS UP MENU

CAL

BRINGS UP CAL MENU

USER

ALLOWS ADJUSTMENTS

ZERO

ALLOWS ZERO CALIBRATION

PROMPT: ALARMS ARE NOW OFF

SAMPLE POINT 1 TO BE USED

PROMPT: APPLY ZERO GAS

PROMPT: ADJUST OR OK READING

PROMPT: REMOVE ZERO GAS

CALIBRATION

PROMPT: ALARMS ARE NOW OFF

SAMPLE POINT 1 TO BE USED

PROMPT: APPLY SPAN GAS

PROMPT: ADJUST OR OK READING

PROMPT: REMOVE SPAN GAS

ACTIVE

Table 4-2. Calibration Sequence Screens

10 SPAN

12 NEXT

16 NEXT

17 NEXT RETURNS TO NORMAL OPERATION

PROMPT:

PROMPT: GO INTO SPAN

PROMPT:

PROMPT: ALARMS ARE NOW

Figure 4-2.

Chemgard Models

•

When this sequence is done with zero and span gases, adjust the zero and span readings (if necessary) in TABLE 4-2 steps #9 and #15, respectively.

•

If adjustments are needed, press ADJ to access the UP, DOWN and ENTER keys; enter the zeroing and spanning adjustments.

4. Zeroing the Monitor:

When zero gas is required, attach a zero gas scrubber or zero gas cylinder to the connector as shown in FIGURE 4-3.

NOTE: Use only the zero gas cylinder

on monitors calibrated for ammonia.

5. Spanning the Monitor:

When span gas is required, a span gas cylinder must be attached to the connector as shown in FIGURE 4-5.

NOTE: The span gas must be appropriate for

monitor calibration. For many applications, a span gas cylinder of the gas of interest is available from MSA. If a span gas cylinder of the specific gas is not available, MSA has

determined an appropriate synthetic span gas. See TABLE 4-1 for calibration cylinders available from MSA. If a synthetic span gas is used, refer to the calibration label on the inside of the monitor door (FIGURE 4-6

Section 4, Calibration

Chemgard Infrared Gas Monitor

4-4

Fig

ure 4-3.

ZERO Calibration

ure 4-4. Unit Span Calibration

Fig

Chemgard Infrared Gas Monitor

Section 4, Calibration

4-5

•

Set the unit to the value given on the "s shown in FIGURE 4-6.

6. Perform the TAB

a. App

b. Accept (OK) or adjust ("ADJ") an

c. App

ly zero gas when requested.

•

Allow enough time for a stable reading.

enter a zero re

ly span gas when requested.

•

Allow enough time for a stab

le reading.

ynthetic span" label

LE 4-2 sequence.

ading.

ure 4-5. Unit Span Calibration

Fig

d. Accept (OK) or adjust ("ADJ") an

7. Remove the con re-attach the samp monitor i

If the sampling line is not re-attached, the monitor cannot sample from the remote location.

Duri

ng calibration, the alarm relays do not activate; ensure that a hazardous condition does not exist when calibrating the Chemgard system.

enter the correct span reading.

nector assembly and

nlet.

WARNING

ling line to th

Section 4, Calibration

Chemgard Infrared Gas Monitor

4-6

Figure 4-6.

SPAN Calibration

Fig

ure 4-7. Unit Calibration Label

Chemgard Infrared Gas Monitor

Section 5, Maintenance

5-1

PART

PART NO.

Internal Filter, Single Point

711561

Ammonia

Ammonia Unit, Filter, End-of-Line

655652

Display

655786

(gray ribbon cable)

Power Supply

637394

Low Flow Switch

637824

1/8" (3.16 mm) ID

Nylon Tubing, 1/4" OD, 0.180" (4.57 mm) ID

29207

Teflon-Lined Tubing

603876

Equalization Valve

711371

Gasket, Beacon Assembly

711168

Sonalert

629693

Span Gas Scrubber

803874

(black/orange cable)

Printed Circuit Board, Membrane Switch, Keypad

711340

Section 5 Maintenance

General Maintenance

Under normal operation conditions the Chemgard Monitor requires minimal maintenance. The end-of-sample-line filter(s) should be examined regularly for dirt/dust build-up and replaced when necessary. If the filter(s) become severely clogged with dust, the flow rate will eventually fail and a flow alarm will occur. If the end-of-sample-line filters are used and serviced correctly, the filters installed inside the monitor should rarely require replacement; however, these internal filters must be ins

pected periodically.

Obtaining Replacement Parts

To obtain replacement parts, address the order or inquiry to:

Mine Safety Appliances Company Instrument Division P.O. Box 427, Pittsburgh, PA 15230

or call, toll-free, 1-800-MSA-INST.

WARNING

Use only genuine MSA replacement parts when perform ing any maintenance procedures. Failure to do so may seriously impair unit performance. Repair or alteration of the Chemgard Monitor, beyond the scope of these instructions or by anyone other than authorized MSA service personnel, could cause the product to fail to perform as designed and persons who rely on this product for their safety could sustain serious personal injury or death.

Table 5-1. Replacement Parts

Internal Filters, all Multipoint and single-point

Filter, End-of-Line 711561

2.0 amp, 250 volt Fuse 638091

Front Panel Printed Circuit Board Assembly

Pump Assembly 711479

Polyurethane Tubing, 1/4" (6.35 mm) OD,

Polyethylene Tubing, 1/4" (6.35 mm) OD,

0.17" (4.32 mm) ID

Strobe, Beacon Assembly 634674

Connector, Beacon Assembly 637523

Zero Gas Scrubber 803873

Front Panel Printed Circuit Board Assembly

Label, Keypad 711615

Troubleshooting Guidelines

See TABLE 5-2.

655533

10014705

603806

29264

711386

Section 5, Maintenance

Chemgard Infrared Gas Monitor

5-2

TROUBLE

DESCRIPTION

SOLUTION

Table 5-2. Troubleshooting Guidelines

1. Check AC power to unit.

2. Verify AC power to unit is wired properly.

3. Replace L1 and/or L2 fuse.

4. Check for loose wires on terminal barrier input.

Unit will not turn ON

Beacon will not light

Under-range failed

Calibration failed

No power

Beacon alarm

Zero limit is minus 10 ppm

Coefficients out of range

5. Check wiring to the unit power supply. Remove power supply cover and check fuse; replace if necessary.

6. Check input cable to main board on left side of power supply.

7. Check for 12 VDC power supply output. Connect the DVM negative lead to TP5 and the positive lead to TPSPD1. Adjust Volt 2 pot on the power supply if necessary.

8. Move the DVM positive lead to TPSPD3. The voltage should be 5 VDC. Adjust Volt 1 pot on power supply if necessary.

1. Check that plug is connected to circuit board: J10

2. Verify the audio option is used in the setup screens.

3. Replace beacon assembly.

1. Adjust display zero to 0.0 via the keypad with zero air or zero scrubber applied.

2. Check the zero air cylinder; replace if necessary.

3. Check the zero scrubber; replace if necessary.

1. Replace zero scrubber or change zero air supply.

2. Check span gas supply.

3. Check all tubing, filters and fittings for leaks.

4. For sequencer units, make sure the unit is locked on the selected sample port used for calibration.

Bypass flow failed

Leaky or blocked bypass line

5. Leak test the flow system.

6. Return to MSA for service.

1. Remove all input lines to unit. Attach one line at a time to check for bypass input. The line that causes flow failure is the problem; check the line’s end-of-line filter.

2. Check inlet fitting, tubing, orifices, bypass pressure switch, and bypass manifold tubing.

3. Check pressure switch for 4 VDC ON and OFF switching (if sequencing); if single-point, it will be ON constantly. Check cable terminals and plug end at BP/SCN. Replace the bypass pressure switch if necessary.

4. Check operation of all bypass valves in manifold.

5. Leak test the flow system.

Chemgard Infrared Gas Monitor

Section 5, Maintenance

5-3

TROUBLE

DESCRIPTION

SOLUTION

failed

component

range failed

0 to 90 oC

temperature

45 to 90 oC

output

source assembly

for operation

microphone for output

Table 5-2. Troubleshooting Guidelines

Start bypass flow failed

Sensor flow failed

Start sensor flow failed

Case temperature

Thermostat sensor failed

Sensor temperature range failed

Humidity sensor failed

Infrared source failed

Photo synchro failed

PA IR sensor failed

Leaky or blocked bypass line at startup of unit

Leaky or blocked sample line

Leaky or blocked sample flow line at unit startup

Main board

Case temperature is

Controls optical bench inside

Checks for temperature range of

Checks H

Checks the I of

Checks the chopper

Checks the sensor

O sensor

1. Same as bypass flow failure. Check as above, turn unit off and restart unit.

2. Leak test the flow system and restart unit.

1. Remove all input lines to the unit. Attach one line at a time to check for sample input. Check all end of line filters. Sample flow failure is always the present point being sampled.

2. Remove the optical bench cover. Check the inlet fitting, tubing, sample filter, tubing to the optical bench inlet fitting, outlet fitting from the optical bench, sample pressure switch, and sample manifold tubing.

3. Check the sample pressure switch for 4 VDC ON and OFF switching. Check the cable terminals and plug end at press/sample connector.

Replace pressure switch if necessary.

4. Check operation of all manifold sample valves. Check the optical bench inlet and outlet valves.

5. Check the optical bench inlet and outlet valve connectors on J22 and J21.

6. Leak test the flow system.

1. Same as sensor flow failure. Check as above; turn unit OFF and re-start unit.

2. Leak test the flow system.

1. Return to MSA for service.

1. Replacement of optical bench requires MSA service.

1. Replacement requires MSA service.

1. Return to MSA for service.

Memory protect

External reset failed

Display failure

Audio alarm failure Audio alarm

Checks checksum

Checks the external reset button

Display communications

1. Return to MSA for service.

1. If not used, check for jumper between RST minus and RST plus on J16.

2. If used, verify switch is wired normally closed.

1. Check RS485 connector on J15, terminals 1 and 2.

2. Check for broken or cracked display.

3. Remove rear panel cover and check cables between the display and the display board.

1. Check output terminals 6 and 7 on J17.

2. Check for faulty horn buzzer.

6-1

Chemgard Infrared Gas Monitor Section 6, Data Logging

Section 6 Data Logging

Log Size

The Chemgard unit allows 1,078 sets of data and events to be logged. This data is either the maximum or average of the "last" data calculated.

Last Values

The maximum value is taken from the ’last’ data; this is not always the highest value displayed, but the last valid data taken from a point. The average is an average of ’last’ data values. Usually, the last data is the fourth reading during normal operation (or the twelfth reading monitor is in an extended dwell). Invalid (blank) and under-range data are not recorded. Over-range is recorded as 1000 ppm.

Number of Data Points Used

If the unit is only a single point monitor or all but one point is inactive, the value is recorded every sixteenth reading; this is 30 values per hour. With four points active, 15 values per point are recorded every hour. The number of values can be considerably lower if the monitor enters extended dwell because of high gas concentrations.

if the

User Setup Options

When the monitor enters the Ready State, the data array is cleared. Then, four valid concentration values are needed before any data is recorded. Concentrations are recorded either every 15 minutes or hourly. If the logging function is turned OFF, the clock/calendar chip is stopped to save battery energy.

• Before the logging is turned ON, the

clock/calendar must be set.

Setting any value starts the clock/calendar. Hours or days may be skipped or repeated. The log can be cleared in the Setup Menu.

Viewing Alarms/Events and Data

From the Review Events Screen, the user can view just alarms, just events, or both. The latest event is presented first. When the memory is filled, the entries wrap around.

From the Review Data Screen, the user can view the recorded concentrations. The particular point must be selected. Again, the latest data is presented first; when the memory is filled, the entries wrap around.

A-1

Chemgard Infrared Gas Monitor Appendix A, Check List

Appendix A Check List

Before applying power to the Chemgard Infrared Gas Monitor, check for all items in the following table:

ITEM

Proper mounting of Chemgard Infrared Gas Monitor on a non-vibrating surface which does not block the front panel. Mounting must be away from direct solar heating.

Correct electrical connections and wiring to Chemgard Infrared Gas Monitor. Wiring must be done for proper voltage.

Proper tubing for sample line.

Removal of all caps and plugs at sample line inlets and exhaust.

Proper end-of-line filters installed.

Disabling of unused sampling points.

CHECK FOR:

CHECKED OR INITIALED

Possession of proper calibration kit and check gases for calibration.

An established routine calibration schedule.

Appendix B, Relay Module

Chemgard Infrared Gas Monitor

B-1

Appendix B Relay Module

This accessory module has not be evaluated by Underwriters Laboratory, Inc.

General Description

The Chemgard Relay Module is intended to provide discrete relay outputs for the Chemgard Infrared Gas Monitor equipped with a multi-point sequencer.

The Chemgard Infrared Gas Monitor has three alarm threshold levels (CAUTION, WARNING, and ALARM), each with a corresponding form C relay output. The user can obtain alarm level information via the set of three relay contacts.

The Chemgard Infrared Gas Monitor relays do not convey point-wise alarm level information. These relays provide information at the monitor level only, one set of relay contacts (CAUTION, WARNING and ALARM) per sequencer point.

Figure B-1. Relay Module

Used as intended, the Chemgard Relay Module enables the user to obtain point-wise alarm level information.

The Chemgard Relay Module monitors the current state of the Monitor and sets its installed relays according to information received. While the Chemgard Relay Module receives its information from the Chemgard Infrared Gas Monitor, it important to note that the Relay Module operates independently with respect to the Reset Switch and Audio operation. Refer to "Operation" later in this appendix for details.

NOTE: The use of ALARM in capital letters refers to

the specific Chemgard Infrared Gas Monitor

third alarm threshold level.

Chemgard Infrared Gas Monitor

Appendix B, Relay Module

B-2

SYSTEM

MAXIMU

Figure B-2. Mounting the Relay Module

Specifications

TEMPERATURE RANGE

POWER 85 - 264 Volts @ 40 Watts max.

WARM-UP TIME

HUMIDITY 0 to 99% RH non-condensing

COMMUNICATION

RELAYS

HORN

DIMENSIONS

WEIGHT Approximately 25 lbs (11 kg)

Table B-1. Specifications

OPERATING 0 to 50

STORAGE -20 to 60

30 seconds

RS-485

COMMON TROUBLE AND HORN RELAY

CAUTION, WARNING AND ALARM RELAYS

TERMINAL BLOCK

80 db (2 feet [609.6 mm] at ambient temperature

(317.5 mm wide x 165 mm deep x

12.5" wide x 6.5" deep x 15" high

381 mm high)

10 Amps @ 125, 250 VAC

10 Amps @ 30 VDC

4 Amps, 1/20 H.P. @ 125, 250 VAC

3 Amps @ 30 VDC

can accept up to 12 AWG wire.

and pressures)

Figure B-3. Relay Module Main Power Connector

and Communication Cable Connector Locations

Appendix B, Relay Module

Chemgard Infrared Gas Monitor

B-3

Figure B-4. Chemgard Relay Module Power Wiring

Diagrams for 120 Volts and 240 Volts AC

Figure B-5. Chemgard Infrared Gas Monitor

Communication Cable Connections

Chemgard Infrared Gas Monitor

Appendix B, Relay Module

B-4

UNIT N/A

Figure B-6. Typical Interface Modules

Unpacking the Shipping Carton

The shipping carton should contain the Chemgard Relay Module.

Identifying the Unit

Each bank of relays (see FIGURE B-3) is assigned to a particular alarm level. Chemgard Relay Modules can be purchased with one, two, or three internal relay banks (TABLE B-2).

Table B-2. Part Numbers and Supplied Relays

UNIT P/N

710847

710847 490558 1

RELAY

P/N

COMPLETE

QUANTITY

RELAYS

710847 490558 2

DESCRIPTION

1 BANK OF

RELAYS

2 BANKS

OF RELAYS

3 BANKS

OF RELAYS

DEFAULT

RELAY

ASSIGNMENT

ALARM

WARNING

ALARM

CAUTION

WARNING

ALARM

The default relay assignment may be changed. Consult the factory for more information.

Appendix B, Relay Module

Chemgard Infrared Gas Monitor

B-5

Mounting Your Unit

Mount the Chemgard Relay Module adjacent to the controlling Chemgard Infrared Gas Monitor using the four mounting holes as shown in FIGURE B-2 (hardware not supplied).

Electrical Connections for the Chemgard Relay Module

Follow all applicable practices and local codes. Use appropriate conduit and cable glands when installing the Chemgard Relay Module and Chemgard Infrared Gas Monitor.

Main Power Connections

Ensure that all primary power is turned OFF at the circuit breaker or fuse. Do not wire the Chemgard Relay Module with power ON.

Wiring the Chemgard Relay Module with the power ON may result in electrocution which may cause injury or death.

WARNING

Identify the main power voltage that will power the Chemgard Relay Module; if unsure of your primary power, consult an electrician or local power utility.

Application o f i mproper p ower to the Chemgard R elay Module will result in damage to the unit.

CAUTION

Refer to FIGURES B-3, B-4 and B-5 to identify the location of the main power connections within the Chemgard Relay Module.

1. Locate the power wiring entry on the lower left hand side of the unit and remove the hole plug.

2. Route the power wiring through the hole using proper hardware/conduit (not supplied).

3. Strip the power wiring conductors.

4. Insert each stripped conductor into its proper location in the power cable connector (FIGURE B-4

5. Tighten each screw within the connector to secure each wire.

6. Pull on each wire to ensure that it will remain in place. If a wire comes out of the connector, loosen the screw, reinsert the wire, and re-tighten the screw.

7. The Relay Module must have the same electrical ground as the Monitor unit.

Communication Cable Connections

Use the factory-recommended RS485 communication cable. Low capacitance wire for RS485 communications, such as Beldon #9841, is recommended.

Maximum length of the communication cable is 1000 feet (305 m); otherwise, the Chemgard Relay Module will not operate properly.

Use only the recommended cable. Using inferior or wrong communication cable causes improper operation of the Chemgard Relay Module.

Do not excee d the maximum length of communication cable listed; otherwise, the Chemgard Relay Module may not operate properly and may not indicate a trouble condition.

CAUTION

WARNING

Communication Cable Connections to the Chemgard Relay Module

1. Locate the RS-485 communication cable inside the Chemgard Relay Module enclosure.

2. Locate the eight cable entries on the right side of the relay module (FIGURE these eight cable entries, choose one of the three bottom entries and remove the hole plug.

3. Route the communication cable through the hole using proper hardware (not supplied) to secure the cable. A 30 mm distance must be maintained between this communication cable and the electronic assembly or power line feeds.

Communication Cable Connections to the Chemgard Infrared Gas Monitor

1. Route the communication cable to the Chemgard Infrared Gas Monitor.

2. Find an unused entry in the Chemgard Infrared Gas Monitor enclosure and remove the hole plug.

3. Route the communication cable through the hole using proper hardware (not supplied) to secure the cable.

4. Strip each communication cable conductor.

5. Insert each stripped conductor into its proper location on the communication cable connector (Refer to FIGURE B-5 for connector location and function designation). The connector labeled "+" on the Relay Module must be connected to the

B-2). From

Chemgard Infrared Gas Monitor

Appendix B, Relay Module

B-6

RS485 connector labeled "+" on the Monitor. Likewise, the connector labeled "-" on the Relay Module must be connected to the RS485 connector labeled "-" on the Monitor.

6. Tighten each screw within connector to secure each wire.

7. Pull on each wire to ensure that it will remain in place. If a wire comes out of the connector, loosen the screw, reinsert the wire, and re-tighten the screw.

Relay Wiring

Before installing any wiring to the relays within the Chemgard Relay Module, refer to the manual for the specific equipment being connected to the relays for wi

ring procedures and requirements. If your unit is a four-point Chemgard model, use the first four relays. The remaining four relays within the bank are not used.

WARNING

Use the proper size wire to any equipment connected to the Chemgard Relay Module relay; otherwise, a fire or electrical damage may result.

1. Refer to FIGURE B-2 for the relay wiring entries into the Chemgard Relay Module.

2. Remove the hole plug(s) required and route the relay wiring through the hole(s) using proper hardware/conduit (not supplied).

3. Strip each relay wiring conductor.

4. Determine the relay functions necessary (see front door label for relay locations and contact information). Insert each stripped relay wiring conductor into the connector for the desired

function.

5. Tighten each screw within the connector to secure each wire.

6. Pull on each wire to ensure that it will remain in place. If a wire comes out of the connector, loosen the screw, reinsert the wire and re-tighten the screw.

7. Once wiring is complete, close and secure the front panel of the Chemgard Relay Module.

CAUTION

Do not allow the front panel of the Chemgard Relay Module to remain open during use.

Operation

Front Panel Indicators

(see FIGURE B-1).

Power Indicator

The power indicator shows that power is properly applied to the unit.

• If this indicator is not ON when power is

applied, refer to the Section 4, Troubleshooting Guidelines.

Trouble Indicator

The Trouble Indicator turns ON and remains ON when a trouble condition is detected. The trouble condition may exist at the controlling Chemgard Infrared Gas Monitor or it may exist locally at

the

Chemgard Relay Module.

Possible trouble conditions:

• Chemgard Remote Relay Module losing

communication with the Chemgard Infrared Gas Monitor for longer than two seconds

• Monitor internal trouble

• Relay Module inoperative relay.

See Section 4, Troubleshooting Guidelines for other possible trouble conditions.

Ready Indicator

• The Ready Indicator turns ON and stays ON

when the controlling Chemgard Infrared Gas Monitor is ready and Relay Module is operating properly

• This indicator remains OFF during the

initial warm-up

• This indicator remains OFF during the initial

Chemgard Inf setup and calibration.

rared Gas Monitor warm-up,

Chemgard Relay Module Relays

There are three types of relays in the Chemgard Relay Module:

• common horn relay

• common trouble relay

• discrete alarm relays

The Common Horn Relay:

• is a double-pole, double-throw (DPDT)

type relay

• contacts are normally connected to equipment

to alert personnel of an alarm condition

The Trouble Relay:

• is a double-pole, double-throw (DPDT)

type relay

• is normally-energized during normal operation

for fail-safe operation

Appendix B, Relay Module

Chemgard Infrared Gas Monitor

B-7

• de-energizes if power is removed

• contacts may be connected to equipment

to alert personnel that a trouble condition exists

The Discrete Caution, Warning and Alarm Relays:

• are single-pole, double-throw (SPDT)

type relays.

• contacts may be connected to equipment to

alert personnel that an alarm condition exists.

Applying Power

Apply power to the Chemgard Infrared Gas Monitor and Chemgard Relay Module. The Power Indicator on the Relay Module should illuminate.

The Trouble Relay in the Relay Module will energize when communications from the Chemgard Infrared Gas

Monitor have been received, no internal relay faults have been detected, and the Chemgard Infrared Gas Monitor is not in the Trouble state.

The Ready Indicator will illuminate when the Chemgard Infrared Gas Monitor is in the Ready state, and the conditions described above remain valid.

Note that during the Warm-Up state of the Chemgard Infrared Gas Monitor, all alarm relays in the Relay Module are cleared.

Alarm Relay Configuration

Latching

The configuration of all alarm relays is controlled by the Chemgard Infrared Gas Monitor.

• If the Chemgard alarm relay (CAUTION,

WARNING, ALARM) is configured as latching, all eight relays of the corresponding bank in the Relay Module are configured for latching operation.

• Likewise, if the Chemgard alarm relay

(CAUTION, WARNING, ALARM) is configured as non-latching, all eight relays of the corresponding bank in the Relay Module are configured for non-latching operation.

Normally Energized/De-energized

While the alarm relays in the Chemgard Infrared Gas Monitor can be configured as

either normally energized or normally de-energized, all alarm relays in the Chemgard Relay Module are magnetically latching; therefore the normally energized/de-energized designations do not apply. The contact labels "normally open," "normally closed" and "common" are assigned for convenience. The "normally open" contacts close and "normally closed" contacts open to signal an

alarm condition. These relays DO NOT change state when power is removed.

Operation

Proper operation of the alarm relays requires maintaining successful communication between the Relay Module and the controlling

Chemgard Infrared Gas Monitor since all alarm relay operations are based on cumulative information received from the Monitor.

Alarm level information for each point of the multi-point sequencer is received from the controlling Chemgard Infrared Gas Monitor. This information is used to set the CAUTION, WARNING, and ALARM relays corresponding to each sequencer point.

• In non-latching configurations, relay(s) will

reset when information from the controlling Monitor indicates that the alarm condition(s) for the specific point has abated.

• In latching configurations, relay(s) remain set

(latched) when the condition abates, and do not reset until the Relay Module reset switch is pressed.

Reset Switch

The reset switches of the Chemgard Relay Module and controlling Chemgard Infrared Gas Monitor act independently. Pressing the reset switch on the Monitor does not affect the Relay Module alarm relays, and pressing the reset switch on the Relay Module does not affect the Monitor alarm relays.

• In non-latching configurations, the Relay

Module reset switch does not affect the state of the alarm relays.

• In latching configurations, the reset switch

resets the alarm relay only if the alarm condition has abated.

Trouble Relay

While a trouble condition in the Chemgard Infrared Gas Monitor activates the trouble relay in the Chemgard Relay Module, a trouble condition in the Relay Module does not activate the trouble relay in the controlling Chemgard Infrared Gas Monitor.

Horn Operation

Configuration

The configuration of the horn relay is controlled by the Chemgard Infrared Gas Monitor.

• The Horn Relay in the Relay Module is

configured by the “Caution sets Audio Ala “Warning sets Audio Alarm,” “Alarm sets

rm,”

Chemgard Infrared Gas Monitor

Appendix B, Relay Module

B-8

Audio Alarm” and "Trouble sets Audio Alarm"

T M M s M t ho

I u ala o a

Unde Rela pe en

board

configuration in the Chemgard Infrared Gas Monitor.

• The "Aux sets Audio Alarm" and "Trouble sets Audio Alarm" configurations of the Monitor apply to the Relay Module Horn relay.

• The Horn relay of the Relay Module is only

latching when the alarms are configured latching in the Chemgard Infrared Gas Monitor.

eset Switch

he reset switches of the Chemgard Relay

odule and controlling Chemgard Infrared Gas onitor act independently. Pressing the reset

witch on the Monitor does not affect the Relay

odule horn, and pressing the reset switch on

he Relay Module does not affect the Monitor

rn.

f the Chemgard Relay Module reset switch has been

sed to silence the Relay Module horn, and any

rm condition (configured to activate the horn) ccurs at a new sequencer point, the horn relay will ctivate to signal the new alarm condition.

aintenance

r normal operating conditions, the Chemgard

y Module requires no maintenance. However, riodic testing of the relays may be done to sure that complete system operation is possible.

roubleshooting Guidelines

Table B-3. Troubleshooting Guidelines

SYMPTOMS

Alarms do not activate

POSSIBLE

CAUSES CAUSES

Chemgard Enable alarms at the Infrared Gas Chemgard Infrared Gas Monitor Monitor alarms not

enabled or communication is lost

Inoperative processor Replace processor board

CORRECTIVE ACTION CORRECTIVE ACTION

Check wiring

Check power supply

Table B-3. Troubleshooting Guidelines

SYMPTOMS

Trouble LED flashes

Power LED not ON

Trouble LED ON

POSSIBLE

CAUSES

Loss of communication

Power fault

Relay trouble or controlling Chemgard Infrared Gas Monitor in Trouble state

CORRECTIVE ACTION

Check wiring between Chemgard Infrared Gas Monitor and Relay Module

Check power wiring or power supply

Check wiring in the Chemgard Relay Module

Check wiring, power supply and fuse

Check relay and relay wiring within Chemgard Relay Module

Obtaining Replacement Parts

To obtain replacement parts, address the order or inquiry to:

Mine Safety Appliances Company Instrument Division P.O. Box 427, Pittsburgh, PA 15230-0427

or call, toll-free, 1-800-MSA-INST

Table B-4. Replacement Parts

Relay Board (PCB) 490558

Power Supply Board (PCB) 655116

Processor Board (PCB) 710392

ITEM PAR T NO.

Chemgard Infrared Gas Monitor

Appendix C, RS-232 Output

C-1

9600 Baud

8 bits

No parity

One stop bit

Appendix C RS-232 Output

Introduction

Your Chemgard Infrared Gas Monitor is ordered and built for the particular types of gas in use. The monitor full scale range may differ from the standard 0 to 1000 ppm range. Check the calibration label on the reverse side of the front cover (FIGURE C-1) to determine your instrument’s full scale range.

The instrument is ready to monitor; however, it is necessary to configure the unit to your specific requirements. Your Chemgard Infrared Gas Monitor may contain an internal Sequencer, enabling your unit to sample from up to eight individual sampling locations.

Multi-Point

Figure C-1. RS-232 Location

Your unit also contains several other features described in this appendix:

• RS-232 output

• Password protection

• Remote Front Panel capability

• Sampling point identification.

Table C-1. RS-232 Parameters

COMMUNICATION PARAMETERS

Appendix C, RS-232 Output

Chemgard Infrared Gas Monitor

C-2

Three types of messages can be transmitted from the RS-232 port:

• status

• data and

• events.

Status

Status is the first message.

• The first seven characters are the gas type.

• The next three characters are the point

number, followed by the concentration and the units.

• The second line is the instrument state and

the alarm level.

• The Trouble State shows the type of fault

detected; see TABLE C-2

• This message is sent every 10 seconds.

Data Logged Value

The data logged value is the next message.

• The first line indicates the date and time.

• The second line shows the:

•

point

•

gas type and

•

logged concentration.

• The message is generated for every point and

sent every 15 minutes or hourly, depending on the setup selection.

• The concentration is an average or the

maximum values for the selected time frame; see TABLE C-3.

Alarm Events

Alarm events is the last message type.

• The first line is the date and time.

• The second name is the:

•

point

•

gas name and

•

alarm level.

• See TABLE C-4.

All of these messages are initiated by the sync character, followed by a binary address byte, 40 ASCII characters, and terminated with a line feed and carriage return.

Table C-2. Status Message

Chemgard Infrared Gas Monitor

Appendix C, RS-232 Output

C-3

Table C-3. Data Logging

RS-232 Output

The RS-232 output broadcasts certain information about the Chemgard Infrared Gas Monitor (TABLE C-3). This output conforms to the specification for RS-232 signal levels and is capable of driving its signal up to 200 feet (61 m) when using low capacitance RS-232 cable. See FIGURE C-1 for RS-232 connector location.

Connection to the RS-232 output is via a 25-pin sub "D" female connector. See FIGURE C-2 for the wiring defini communication, pins 4 and 5 on the sub "D" connector must be connected. FIGURE C-2 shows the connector and wiring as it is wired to a computer. FIGURE C-3 shows the rear view wiring of the connector.

When connecting RS-232 cable to the instrument:

• The strain relief cover or shell on the 25-pin

sub "D" connector must be removed. It is not possible to use a pre-wired or molded cable because its shell or strain relief is not removable. The connector’s shell or strain relief does not fit within the instrument

• It may be necessary to remove the metal

covers from the printed circuit boards to attach the 25-pin sub "D" connector to its mate on the unit. If the metal covers are removed, replace them when the cable’s

tion. To enable this

Table C-4. Alarm Logging

connector is mated to the connector on the printed circuit board.

Remote Gas Sampling Channel Identification

Chemgard Infrared Monitors have two analog outputs:

• 4-20 mA and

• 0-10 Volts.

The voltage output can be programmed to correspond to the channel presently being sampled. The front panel screen indica

1V/PT IF OUT = 1-10V

(1 volt per point if output equals one to 10 volts). When enabled and the unit is monitoring from:

• channel 1, the voltage output is one volt

• channel 2, the voltage output changes to

two volts.

tes:

Appendix C, RS-232 Output

Chemgard Infrared Gas Monitor

C-4

CHANNEL NUMBER

VOLTAGE OUTPUT

2 2 3

5 5 6 6 7

Table C-5. Voltage Output Corresponds to

Channel

Figure C-2. Typical RS-232 Wiring

During unit setup, configure the voltage output to stepping, thus enabling the voltage output to reflect the channel being sampled.

Password Protection (Remote Display Only)

To prevent accidental re-configuration or discourage unit tampering, a password entry can be enabled. This password prevents setup values from being changed. If the password entry is selected, the user must enter th characters before any additional information is available.

ree alphabetic

Figure C-3. RS-232 Connector

The password feature is especially useful when a Remote Front Panel is connected to the Chemgard Infrared Gas Monitor. The Remote Front Panel or the Chemgard Infrared Monitor may have no password or it may have a different password.

To enable this feature, a switch on the front display card must be set. This switch is under the metal cover. To set this switch:

1. Open the front door of the unit.

Chemgard Infrared Gas Monitor

Appendix C, RS-232 Output

C-5

Figure C-4. Access to Switches

Figure C-5. Switch Bank Location

Appendix C, RS-232 Output

Chemgard Infrared Gas Monitor

C-6

Figure C-6. Password Enabling Switches

2. On the inside of the front door, locate the four front cover nuts securing the metal cover (FIGURE C-4).

3. Unscrew and remove these four front cover nuts and lift off the metal cover.

4. Locate the bank of switches on the printed circuit board exposed when the front cover is removed (FIGURE C-5).

5. Each switch is labeled with its number and its position. FIGURE C-6 also shows the switch bank with its numbered switches.

•

Each switch in this bank activates a different feature.

•

TABLE C-8 describes each switch and its function.

•

Read, mark and initial each function you are going to use.

6. To enable the password option, set switch 1 to the ON position.

7. To set or change the password, put switch 2 in the ON position.

•

The front panel display shows:

• the word SET and

• the new password.

To change the password, press three buttons on the front panel.

•

The password will be the last three letters displayed on the front panel display.

•

The button sequence is stored when ENTER is pressed.

After selecting the password, return this switch to the OFF position.

NOTE: The password must be

re-entered when:

•

the unit is de-energized

•

a bad or wrong password is entered

•

a loss of communications is detected between the Chemgard Infrared Gas Monitor and any optional Remote Front Panel

•

no password is entered within the last hour.

8. Switch position 3 allows the following without entering the password:

•

resetting latched alarm relays

•

silencing the audio output.

When setting Switch 3 to the ON position while an audio alarm or a latched relay can be reset, the followi

ng message displays:

• MAIN RESET ALARM.

9. Switch 4 enables communication between the Chemgard Infrared Gas Monitor and a Remote display.

•

When a loss of communications occurs with the Remote Display within 3.5 seconds, the following message displays:

• LOSS OF COMMUNICATION.

•

This switch position also allows the Remote Display speaker to follow the Chemgard Infrared Gas Monitor speaker operation.

10. Switch 5, in the ON position, allows the audio output to automatically reset if the Chemgard Infrared Gas Monitor audio output is reset.

•

Normally, if the Remote Display audio output is energized, it is latched ON until any panel key is pressed.

Table C-7. Function of Switches

SWITCH

POSITION

OFF

ON Set the password

OFF Normal operation

OFF

DESCRIPTION

Enables the password option

Disables the password option

Resetting alarm without the password

Password is necessary to reset alarms

Remote Front Panel connected

INITIALS

Chemgard Infrared Gas Monitor

Appendix C, RS-232 Output

C-7

Table C-7. Function of Switches

SWITCH

POSITION

OFF

ON Not used

OFF Not used

ON Not used

OFF Not used

ON Not used

OFF Not used

No Remote Front Panel connected

Allows the audio output to automatically reset

Manual resetting of the audio output

DESCRIPTION

INITIALS

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MSA Chemgard Instruction Manual

Specifications and Main Features

Frequently Asked Questions

User Manual