RKI Instruments 73-0025-01, 73-0025 User manual

GasWatch 3 for

Carbon Monoxide

(Hydrogen-Compensated)

Operator’s Manual

Part Number: 71-0509

Revision: 0

Released: 4/6/22

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WARNING

Read and understand this instruction manual before operating
instrument. Improper use of the gas monitor could result in bodily
harm or death.

Maintenance of the gas monitor is essential for proper operation and
correct readings.

Bump test the instrument before each day’s use with a known
concentration of the target gas. A bump test can be done in User
Mode’s BUMP item or by applying gas in Measuring Mode. The
instrument does not need to be calibrated unless it does not pass the
User Mode bump test or does not respond appropriately, as defined by
the user, in Measuring Mode. For more information about bump test
and calibration requirements, see IEC 60079-29-2.

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Table of Contents

Chapter 1: Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

About the GasWatch 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

About this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Chapter 2: Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Instrument Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

LCD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Control Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Alarm LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Buzzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Vibrator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Infrared Communications Port. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Battery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Standard Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Alligator Clip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Optional Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Watch Band . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Calibration Cup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

IrDA/USB Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Chapter 3: Measuring Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Turning On the GasWatch 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Performing a Demand Zero . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Turning Off the GasWatch 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Measuring Mode Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Monitoring an Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Alarm Indications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Responding to Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Data Logging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

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Chapter 4: Display Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

Tips for Using Display Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Peak Screen (PEAK). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

STEL Screen (STEL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

TWA Screen (TWA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

User ID Screen (USER ID). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Station ID Screen (STN ID) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Last Successful Calibration Date (CAL.DATA). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Last Successful Bump Test Screen (BP.DATA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Date/Time Screen (DATE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Temperature Screen (TEMP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Alarm Points Screen (ALARM--P) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Adjusting the Buzzer Volume (BUZZ.VOL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Chapter 5: User Mode and Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Entering User Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Tips for Using User Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Performing a Bump Test (BUMP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Performing a Calibration (GAS CAL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Setting Calibration Parameters (CAL SET) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Setting Bump Test Parameters (BUMP.SET) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Alarm Settings (ALARM--P) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

Updating the Lunch Break Setting (LUNCH) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Setting the Confirmation Beep and Non-Compliance Indicator (BEEP) . . . . . . . . . . . . . 69

Updating the Backlight Time (BL TIME). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Turning the Key Tone On/Off (KEY.TONE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Display Mode Items (DISP.SET) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Zero Suppression (ZERO.SUP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Zero Follower (ZERO.FLW) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Turning Easy Calibration On/Off (E-CAL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Setting the Date/Time (DATE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Turning the Password On/Off (PASS-W) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

Viewing the ROM/SUM (ROM/SUM). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Entering Measuring Mode (START) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Chapter 6: Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .76

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

Replacing the Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

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Replacing the Charcoal Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

Replacing the Hydrophobic Filter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

Replacing the Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

Chapter 7: General Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .83

Appendix A: Maintenance Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .85

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

Entering Maintenance Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

Tips for Using Maintenance Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

Performing a Calibration (GAS CAL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

Performing a Gas Test (GAS.TEST). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

Sensor/Battery Replacement Date (SEN.DATE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

Performing a Bump Test (BUMP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

Setting Alarms to Latching or Self-Resetting (LATCH) . . . . . . . . . . . . . . . . . . . . . . . . . 91

Turning the Demand Zero Function On/Off (D.ZERO). . . . . . . . . . . . . . . . . . . . . . . . . . 91

Turning the Auto Zero Function On/Off (A.ZERO). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

Turning the ID Display Function On/Off (ID DISP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

Turning the Zero Suppression On/Off (ZERO.SUP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

Turning the Zero Follower On/Off (ZERO.FLW) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

User Mode Zero Suppression (ZSUP.DSP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

User Mode Zero Follower (ZFLW.DSP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

Cylinder Setting (CYL.DISP). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

Setting the Date/Time (DATE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

Turning the Password On/Off (PASS-W) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

Viewing the ROM/SUM (ROM/SUM). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

Performing a Default (M.DEF). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

Entering Measuring Mode (START) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

Appendix B: Gas Select Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .98

Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

Entering Gas Select Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

Tips for Using Gas Select Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99

Saving the Alarm Points (SAVE-AP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

Turning the Calibration Max Span On/Off (MAX.SPAN) . . . . . . . . . . . . . . . . . . . . . . . 101

Stealth and Vibrator Settings (STEALTH) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

Exiting Gas Select Mode (START). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .103

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WARNING: Understand manual before operating. This is an intrinsically safe product.

Substitution of components may impair intrinsic safety. To prevent ignition of a
hazardous atmosphere, batteries must only be changed or charged in an area
known to be nonhazardous. Not tested in oxygen enriched atmospheres (above
21%).

AVERTISSEMENT: Comprendre le manuel avant de l'utiliser. Ceci est un produit

intrinsèquement sûr. La substitution de composants peut nuire à la
sécurité intrinsèque. Pour éviter l'inflammation d'une atmosphère
dangereuse, les batteries ne doivent être remplacées ou chargées que
dans une zone non dangereuse. Non testé dans des atmosphères
enrichies en oxygène (plus de 21%).

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Chapter 1: Introduction

Overview

This chapter briefly describes the GasWatch 3 gas monitor. This chapter also describes the
GasWatch 3 Operator’s Manual (this document). Table 1 at the end of this chapter lists the
specifications for the GasWatch 3.

About the GasWatch 3

Using an advanced detection system, the GasWatch 3 personal gas monitor detects the presence of
carbon monoxide (CO). The GasWatch 3’s compact size and easy-to-use design make it ideally
suited for a wide range of applications, including sewage treatment plants, utility manholes,
tunnels, hazardous waste sites, power stations, petrochemical refineries, mines, paper mills,
drilling rigs, and fire fighting stations. The GasWatch 3 offers a full range of features, including:

• Liquid crystal display (LCD) for complete and understandable information at a glance

• Ultrabright alarm LEDs

• Distinctive audible/vibrating alarms for dangerous gas conditions and audible alarms for
unit malfunction

• Microprocessor control for reliability, ease of use, and advanced capabilities

• Data logging functions

• Alarm trend data

• STEL, TWA, and over range alarms

• Peak reading

• Built-in time function

• Lunch break feature

• CSA “C/US” classification for Class I, Division I, Groups A, B, C, and D hazardous
atmospheres

WARNING: The Model GasWatch 3 detects elevated levels of carbon monoxide which can be

dangerous or life threatening. When using the GasWatch 3, you must follow the
instructions and warnings in this manual to assure proper and safe operation of
the unit and to minimize the risk of personal injury. Be sure to maintain and
periodically calibrate the GasWatch 3 as described in this manual.

7 • Chapter 1: Introduction GasWatch 3 for Carbon Monoxide (Hydrogen-Compensated)

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AVERTISSEMENT: Le modèle GasWatch 3 détecte les niveaux élevés de monoxyde de

Specifications

Table 1: Standard Sensor Specifications/Alarm Points

carbone qui peuvent être dangereux ou mettre la vie en danger. Lorsque
vous utilisez le GasWatch 3, vous devez suivre les instructions et les
avertissements de ce manuel pour assurer un fonctionnement correct et
en toute sécurité de l'appareil et pour réduire les risques de blessures.
Assurez-vous de maintenir et d’étalonner périodiquement le GasWatch 3
comme décrit dans ce manuel.

Detection Range

Lowest Detectable Limit (LDL)

Reading Increment

Warning Factory Setting

Alarm Factory Setting

Alarm H Factory Setting

STEL Alarm

TWA Alarm

Indication Accuracy

Sampling

Method

Diffusion

0 - 2,000 ppm

3 ppm

0 - 300 ppm: 1 ppm
310 - 2,000 ppm: 10 ppm

25 ppm

50 ppm

1,200 ppm

200 ppm

25 ppm

• 0 - 300 ppm: ± 5% of reading or ± 5
ppm CO (whichever is greater)

• 310 - 2,000 ppm: ± 20% of reading

Table 2: GasWatch 3 Specifications

Response Time T90 Within 10 Seconds

Display Graphics LCD Display

Operating

Temp er at ur e

& Humidity

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Continuous environment: -20°C to 50

Temporary environment (up to 15 minutes): -20°C to 60

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°

C/10 to 90% RH

°

C/0 to 95% RH

Safety/

Regulatory

Power Supply CR2450 button cell battery

Continuous

Operating

Hours

@ 25 °C

Case High-impact Plastic, RF Shielded, Dust and Weather Proof (IP66/68)

• ATEX: II 1G Ex ia IIC T4 Ga
Certificate Number Presafe DEKRA 18ATEX0130

• IECEx: Ex ia IIC T4 Ga
Certificate Number IECEx DEK 18.0082

• CSA classified, “C/US”, as Intrinsically Safe. Exia. Class I, Groups A, B, C, & D.
Temperature Code T3A.
Certificate Number CSA 19 CA70213062

C US

186718

2,500 hours in Measuring Mode (Non Alarm Operation, Fully Charged)

Standard

Accessories

Optional

Accessories

Dimensions
and Weight

• Alligator clip

• Watch band

• Calibration cup

• Datalogging and Setup Programs (Windows

• IrDA/USB Cable for connecting to a computer when using the Datalogging and
Setup Programs (not needed if computer has an infrared port)

Approximately 42(H) x 63(W) x 22(D) mm (1.7”H x 2.5”W x 0.9”D)
Approximately 45 g (1.6 oz.)

About this Manual

The GasWatch 3 Operator’s Manual uses the following conventions for notes, cautions, and
warnings.

NOTE: Describes additional or critical information.

®

7, 8, and 10), available at

CAUTION: Describes potential damage to equipment.

WARNING: Describes potential danger that can result in injury or death.

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Chapter 2: Description

Figure 1: Component Location

Alarm LEDs and IrDA Port

Sensor Retainer

Sensor O peni ng

LCD

Buzzer

Opening

AIR Button

POWER/MODE Button

Overview

This chapter describes the GasWatch 3 instrument and its accessories.

Instrument Description

Case

The GasWatch 3’s sturdy, high-impact plastic case is radio frequency (RF) resistant and is suitable
for use in many environmental conditions, indoors and out. The case is dust proof and water
resistant. A clear plastic window is located on the front of the case for viewing the LCD. The
sensor retainer is located on the right side of the case and allows access to the filters and sensor.

LCD

A digital LCD (liquid crystal display) is visible through a clear plastic window in the top case.
The LCD shows the gas reading. The LCD also shows information for each of the GasWatch 3’s
operating modes.

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Control Buttons

Two control buttons, AIR and POWER/MODE, are located below the LCD.

Table 3: GasWatch 3 Control Button Functions

Button Function(s)

AIR • turns on LCD backlight

• resets alarm condition if LATCH is set to ON in Maintenance Mode

• enters User Mode, Maintenance Mode, and Gas Select Mode when
used with POWER/MODE

• activates the demand zero function (adjusts the GasWatch 3’s fresh
air reading)

• changes the value of a parameter available for adjustment

• scrolls through parameter options

POWER/MODE • turns the GasWatch 3 on and off

• turns on LCD backlight

• enters and scrolls through Display Mode

• enters instructions into the GasWatch 3’s microprocessor

• resets alarm condition if LATCH is set to ON in Maintenance Mode

• enters User Mode, Maintenance Mode, and Gas Select Mode when
used with AIR

Alarm LEDs

The two alarm LEDs above the LCD alert you to gas, low battery, and failure alarms.

Buzzer

One solid-state electronic buzzer is located inside the case. Sound exits the case through a hole in
the middle front of the case. The buzzer sounds for gas alarms, malfunctions, and low battery
voltage. It also provides feedback for button presses and while in Display, User, Maintenance, or
Gas Select Mode.

Vibrator

A vibrating motor inside the GasWatch 3 case vibrates for gas alarms and unit malfunctions.

NOTE: If STEALTH is set to ON, the vibrator only functions when VIB in the STEALTH Gas

Select Mode item is set to ON (see page 101).

11 • Chapter 2: Description GasWatch 3 for Carbon Monoxide (Hydrogen-Compensated)

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Sensor

The sensor retainer holds the sensor in its socket. The CO sensor is an electrochemical cell that
consists of two precious metal electrodes in a dilute acid electrolyte. A gas permeable membrane
covers the sensor face and allows gas to diffuse into the electrolyte. The gas reacts in the sensor
and produces a current proportional to the concentration of the target gas. The GasWatch 3’s
circuitry amplifies the current, converts the current to a gas concentration, and displays the
concentration on the LCD.

This sensor does not respond to or responds minimally to hydrogen (displays H2 RICH once H2
concentration reaches 2000 ppm).

Filters

Charcoal Filter (Black)

A black charcoal filter is placed into a recess in the filter gasket over the CO sensor. The charcoal
filter disk scrubs H2S and certain hydrocarbons out of the sample to avoid false CO readings. If
false or elevated CO readings are noticed, especially in the presence of H2S, change the charcoal
filter.

Hydrophobic Filter

The white, circular hydrophobic filter sits on the filter gasket, covering the sensor port and the
charcoal filter.

Infrared Communications Port

An infrared (IR) communications port is located at the top of the instrument, near the LEDs.
Logged data transmits through the port in standard IrDA protocol. A computer’s infrared port or
an IrDA/USB cable connected to a USB port can be used to download data to the GasWatch 3
Datalogging Program. See the GasWatch 3 Datalogging Program operator’s manual for data
logging and downloading instructions.

Battery

A user-replaceable CR2450 button cell battery powers the GasWatch 3. At 25°C the battery lasts
at least 2,500 hours (104 days). The battery icon in the upper right of the LCD shows remaining
battery life.

A low battery warning activates when the GasWatch 3 detects a low battery voltage. The
GasWatch 3 sounds a dead battery alarm when battery voltage is too low for Measuring Mode.

NOTE: Use of batteries not specified by RKI Instruments, Inc. compromises the CSA

classification and may void the warranty. See “Replacing the Battery” on page 77.

WARNING: To prevent ignition of a hazardous atmosphere, the battery must only be changed

in an area known to be nonhazardous.

AVERTISSEMENT: Pour éviter l'inflammation d'une atmosphère dangereuse, la batterie ne

doit être remplacée que dans une zone non dangereuse.

GasWatch 3 for Carbon Monoxide (Hydrogen-Compensated) Chapter 2: Description • 12

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Standard Accessories

Alligator Clip

Base Clip

Figure 2: Alligator Clip

Figure 3: Watch Band

Alligator Clip

An alligator clip is installed to a base clip that attaches to spring bars on the back of the GasWatch

3. Use the alligator clip to attach the GasWatch 3 to clothing or a belt. Teeth in the alligator clip’s
jaws prevent slipping. The alligator clip can be rotated to change the instrument’s orientation.

Optional Accessories

Watch Band

The adjustable watch band allows the GasWatch 3 to be worn on the wrist. The watch band
attaches to spring bars that are protected by hollow tubes.

13 • Chapter 2: Description GasWatch 3 for Carbon Monoxide (Hydrogen-Compensated)

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Calibration Cup

FLOW

Figure 4: Calibration Cup

The calibration cup installs over the sensor. You must use the calibration cup when performing a
bump test, calibration, or gas test.

IrDA/USB Cable

Unless your computer has a built-in IrDA port, a IrDA/USB cable is needed to establish
communication between the GasWatch 3 and the Datalogging Program or the Setup Program.

GasWatch 3 for Carbon Monoxide (Hydrogen-Compensated) Chapter 2: Description • 14

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Chapter 3: Measuring Mode

RESUME

SEC

5

YES .MODE

SEC

5

NO .AIR

SEC

5

Overview

This chapter explains how to use the GasWatch 3 to perform confined space entry monitoring or
general area monitoring in Measuring Mode.

Start Up

This section explains how to start up the GasWatch 3, get it ready for operation, and turn it off.

Turning On the GasWatch 3

To illustrate certain functions, the following description of the GasWatch 3 start up sequence
assumes that the following items in User Mode are turned on: LUNCH, CAL.RMDR, and
BP.RMDR in User Mode, and ID DISP and A.ZERO in Maintenance Mode. If any of these
items are turned off, then the corresponding screens do not appear.

1. Press and briefly hold down POWER/MODE. Release the button when you hear a beep.

2. If LUNCH is set to ON (factory setting if OFF, see page 68), the Lunch Break Screen appears. The unit counts down from 5 seconds.

a. Continue Accumulating: To continue accumulating peak and time-weighted average

(TWA) readings from the last time the GasWatch 3 was used, press and release POWER/
MODE or allow the countdown to reach 0. The short-term exposure limit (STEL) reading
is reset each time the GasWatch 3 is turned on.

b. Reset Accumulation: To reset the accumulation of peak and time-weighted average

(TWA) readings, press and release AIR before the countdown reaches 0.

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3. If CAL.RMDR is set to ON (factory setting) and a calibration is due, the screen that appears

CAL - LMT

CAL

CAL - LMT

FAIL

NEXT .CAL

d

0

next depends on how CAL.EXPD is set in User Mode (see page 60). The three possible
screens are described below. If a calibration is not due, the instrument displays the number of
days left until a calibration is due.

CAL.EXPD set to

CONFIRM (factory setting)

LCD

Sound Buzzer sounds double pulsing

tone

Action • Option A, Perform

calibration: Press and
release POWER/MODE to
enter User Mode and
perform a calibration. The
instrument takes you
straight to the calibration
start screen in User Mode’s
GAS CAL\A-CAL(E-CAL)
item. See page 47 for
calibration instructions.

NOTE: If Password
Protection is set ton On

(factory setting is Off) using
the GW-3 Config Program,
you will be prompted for a
password to enter User Mode.

If the calibration is
successful, the screen above
will not appear again until
the unit is due for
calibration. If the calibration
is not successful, the screen
above will again appear in
the startup sequence.

• Option B, Bypass message
To continue without
performing a calibration,
press and release AIR.

CAL.EXPD set to

CANT.USE

Buzzer sounds double pulsing
tone

The GasWatch 3 cannot be

used until a successful calibra-

tion is performed. Press and
release POWER/MODE to
enter User Mode and perform
a calibration. The instrument

takes you straight to the cali-

bration start screen in User
Mode’s GAS CAL/A-CAL
(E-CAL) item. If you don’t
press POWER/MODE, the
instrument automatically goes
to the calibration start screen
after 6 seconds. See page 47
for calibration instructions.

NOTE: If Password
Protection is set ton On

(factory setting is Off) using
the GW-3 Config Program,
you will be prompted for a
password to enter User Mode.

If the calibration is successful,
the screen above will not
appear again until the unit is

due for calibration. If the cali-

bration is not successful, the

:

screen above will again appear
in the startup sequence.

CAL.EXPD set to

NONE

None

• Option A, Perform
calibration: If you want to
enter User Mode and
perform a calibration, press
and release POWER/
MODE. The instrument
takes you straight to the
calibration start screen in
User Mode’s GAS CAL/A­CAL (E-CAL) item.

• Option B, Bypass message
To continue without
performing a calibration,
wait a few seconds for the
instrument to continue with
its startup sequence.

:

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4. If BP.RMDR is set to ON (factory setting is OFF) and a bump test is due, the screen that

BP - LMT

CAL

BP - LMT

FAIL

NEXT .BP

d

0

appears next depends on how BP.EXPD is set in User Mode (see page 65). The three possible
screens are described below. If a bump test is not due, the instrument displays the number of
days left until a bump test is due.

BP.EXPD set to

CONFIRM (factory setting)

LCD

Sound Buzzer sounds double pulsing

tone

Action • Option A, Perform bump

test: Press and release
POWER/MODE to enter
User Mode and perform a
bump test. The instrument
takes you straight to the
bump test start screen in
User Mode’s BUMP item.
See page 42 for bump test
instructions.

NOTE: If Password
Protection is set ton On

(factory setting is Off) using
the GW-3 Config Program,
you will be prompted for a
password to enter User Mode.

If the bump test is
successful, the screen above
will not appear again until
the unit is due for bump
testing. If the bump test is
not successful, the screen
above will again appear in
the startup sequence.

• Option B, Bypass message
To continue without
performing a bump test,
press and release AIR.

BP.EXPD set to

CANT.USE

Buzzer sounds double pulsing
tone

The GasWatch 3 cannot be
used until a successful bump
test is performed. Press and
release POWER/MODE to
enter User Mode and perform
a bump test. The instrument
takes you straight to the bump
test start screen in User
Mode’s BUMP item. If you
don’t press POWER/MODE,
the instrument automatically
goes to the bump test start
screen after 6 seconds. See

page 42 for bump test instruc-

tions.

NOTE: If Password
Protection is set ton On

(factory setting is Off) using
the GW-3 Config Program,
you will be prompted for a
password to enter User Mode.

If the bump test is successful,
the screen above will not
appear again until the unit is
due for bump testing. If the

:

bump test is not successful,
the screen above will again
appear in the startup
sequence.

BP.EXPD set to

NONE

None

• Option A, Perform bump
test: If you want to enter
User Mode and perform a
bump test, press and release
POWER/MODE. The
instrument takes you
straight to the bump test
start screen in User Mode’s
BUMP item.

• Option B, Bypass message
To continue without
performing a bump test,
wait a few seconds for the
instrument to continue with
its startup sequence.

:

17 • Chapter 3: Measuring Mode GasWatch 3 for Carbon Monoxide (Hydrogen-Compensated)

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5. The Date/Time Screen appears for a few seconds.

10:42

2 . 13

2019

AL-L

2.9

V

bAtt

CO

ppm

F .S .

1000

CO

ppm

WARNING

25

CO

ppm

ALARM

50

CO

ppm

ALARM H

1200

CO

ppm

STEL

200

CO

ppm

TWA

25

CO

ppm

UID_001

Id

USER

SID_001

Id

StN

6. The Battery Voltage Screen appears for a few seconds. An “AL-L” at the bottom of the screen
indicates that the alarms are set to latching. An “AL-A” at the bottom of the screen indicates
that the alarms are set to auto reset. See page 91 for a description of how to change this
parameter.

7. The following screens display for 1 second each: Gas Name, Full Scale, Warning Setpoint, Alarm Setpoint, Alarm H Setpoint, STEL Setpoint, and TWA Setpoint.

8. If ID DISP is set to ON (factory setting is OFF, see page 92), the User ID Screen appears for

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GasWatch 3 for Carbon Monoxide (Hydrogen-Compensated) Chapter 3: Measuring Mode • 18

a few seconds, followed by the Station ID Screen.

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9. If the GasWatch 3 experiences a sensor failure during start up, a screen indicating that the

SENSOR

FAIL

CO

ppm

A.ZERO

YES .MODE

NO .AIR

PASS--W

0 0 0 0

sensor failed appears and the buzzer sounds a double pulsing tone once per second.

You cannot acknowledge the failure and continue to Measuring Mode. Replace the failed
sensor as soon as possible.

10. If A.ZERO is set to ON (factory setting is OFF, see page 92), the instrument prompts you to do an auto zero. An auto zero operation sets the reading to 0 ppm.

WARNING: Make sure that the instrument is in a known fresh air environment (an

environment free of combustible or toxic gases and of normal oxygen content,

20.9%) before performing an auto zero operation. If you perform an auto zero
operation in an area with gases present, the adjustment will not be accurate.

You must press and release the POWER/MODE button to perform an auto zero function. If
you do not press any key, after 15 seconds, the instrument enters Measuring Mode without
performing an auto zero.

If Password Protection is turned On (factory setting is Off) using the GW-3 Setup
Program, a user-set password is required to perform an auto zero. When the password
screen appears, adjust each digit with the AIR button and press and release the POWER/
MODE button to move on to the next digit. Once the password is entered, the instrument
performs the auto zero.

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11. The GasWatch 3 is now monitoring for gas in Measuring Mode. The Measuring Mode Screen

10:42

0

CO

ppm

PASS--W

0 0 0 0

displays the current gas reading.

Performing a Demand Zero

Perform a demand zero before using the GasWatch 3. This sets the reading to 0 ppm.

1. Find a fresh-air environment. This is an environment free of toxic or combustible gases and of normal oxygen content (20.9%).

2. Turn on the unit as described above in Turning On the GasWatch 3.

3. Press and hold AIR. The buzzer pulses and the LCD prompts you to continue holding AIR (if KEY.TONE is set to ON in User Mode).

4. Continue to hold AIR until the LCD prompts you to release it. The GasWatch 3 sets the fresh air reading. Start up is complete and the unit is now ready for monitoring.

5. If Password Protection is turned On (factory setting is Off) using the GW-3 Setup Program,
a user-set password is required to perform a demand ero. When the password screen appears,
adjust each digit with the AIR button and press and release the POWER/MODE button to
move on to the next digit. Once the password is entered, the instrument performs the demand
zero.

Turning Off the GasWatch 3

1. Press and hold POWER/MODE.

2. OFF appears on the display and the buzzer pulses for about five seconds (if KEY.TONE is set to ON in User Mode).

3. Release the button when OFF disappears from the display.

GasWatch 3 for Carbon Monoxide (Hydrogen-Compensated) Chapter 3: Measuring Mode • 20

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If Password Protection is turned On (factory setting is Off) using the GW-3 Setup

PASS--W

0 0 0 0

S. 10:42

0

CO

ppm

Program, a user-set password is required to turn off the GasWatch 3. When the password
screen appears, adjust each digit with the AIR button and press and release the POWER/
MODE button to move on to the next digit. Once the password is entered, the instrument
turns off.

Measuring Mode Operation

When the GasWatch 3 completes its startup sequence, it is in Measuring Mode. In Measuring
Mode the GasWatch 3 continuously monitors the sampled atmosphere and displays the gas
concentration. The GasWatch 3 is in Normal Operation if there are no alarm indications.

Heart Symbol: The heart symbol on the right side of the LCD indicates the operation status and
flashes when normal. A microprocessor error causes the heart symbol to stop flashing or to
disappear.

Check Mark: If BP.RMDR is set to ON and if a bump test is not due, a check mark appears in the
lower left corner of the LCD.

“S”: If the instrument is operating in Stealth Mode, an “S.” appears at the bottom of the LCD.

Backlight: In a low-light environment, press and release either button to turn on the display
backlight. See page 71 to program backlight duration.

Confirmation/Non-Compliance Indicator: If the BEEP item in User Mode is set to anything other
than OFF, the GasWatch 3 gives periodic indications to confirm that it’s operating or to indicate a
non-compliance (see page 69).

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Monitoring an Area

10:42

0

CO

ppm

1. Start up the GasWatch 3 as described above in “Start Up” on page 15. It is now in Measuring Mode.

2. The instrument displays the CO reading. The H2 reading is not displayed but “H2 RICH” appears once the H2 concentration rises above 2000 ppm.

3. Take the GasWatch 3 to the monitoring area.

4. Wait at least 15 seconds.

5. If a reading is observed, allow the reading to stabilize to determine the gas concentration present.

6. If a gas alarm occurs, take appropriate action. See page 25.

Alarms

This section covers alarm indications in Measuring Mode. It also describes how to reset the
GasWatch 3 after an alarm occurs and how to respond to an alarm condition.

NOTE: False alarms may be caused by radio frequency (RF) or electromagnetic (EMI)

Alarm Indications

The GasWatch 3 buzzer sounds an alarm, the LEDs flash, and the vibrator pulses when any sort of
alarm condition or failure occurs. If the GasWatch 3 is operating in Stealth Mode, the buzzer does
not sound and the vibrator’s operation depends on the VIB setting in Gas Select Mode’s

STEALTH item. See page 101 for more information.

NOTE: If an alarm condition occurs while you are in Display Mode, the GasWatch 3

interference. Keep the GasWatch 3 away from RF and EMI sources such as radio
transmitters or large motors.

automatically returns to the Measuring Mode screen.

GasWatch 3 for Carbon Monoxide (Hydrogen-Compensated) Chapter 3: Measuring Mode • 22

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The table below summarizes the types of alarms produced by the GasWatch 3 and their
indications.

Table 4: Alarm Types and Indications

Alarm Type Visual Indications Other Indications

Warning

Concentration of gas rises above
the Warning setting.

Alarm

Concentration of gas rises above
the Alarm setting.

Alarm H

Concentration of gas rises above
the Alarm H setting.

• Gas reading flashes

• WARNING appears at the bottom
of the LCD

• Alarm LEDs flash once per
second

• Backlight turns on

• Gas reading flashes

• ALARM appears at the bottom of
the LCD

• Alarm LEDs flash twice per
second

• Backlight turns on

• Gas reading flashes

• ALARM H appears at the bottom
of the LCD

• Alarm LEDs flash twice per
second

• Backlight turns on

• High-low tone sounds
once per second

• Vibrator pulses once per
second

• High-low tone sounds
twice per second

• Vibrator pulses twice
per second

• High-low tone sounds
twice per second

• Vibrator pulses twice
per second

TWA or STEL

Concentration rises above the
TWA or STEL alarm setting.

H2 RICH

Concentration of hydrogen rises

above 2000 ppm (parts per mil-

lion).

• Gas reading flashes

• TWA or STEL appears at the
bottom of the LCD

• Alarm LEDs flash once per
second

• Backlight turns on

• H2 and rich alternate on the top
line

• OVER appears at the bottom of
the LCD

• Alarm LEDs flash twice per
second

• Backlight turns on

• High-low tone sounds
once per second

• Vibrator pulses once per
second

• High-low tone sounds
twice per second

• Vibrator pulses twice
per second

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Table 4: Alarm Types and Indications

Alarm Type Visual Indications Other Indications

Over Range • Gas reading is replaced with a

flashing

• Gas name and units flash

• OVER appears at the bottom of
the LCD

• Alarm LEDs flash twice per
second

• Backlight turns on

Minus Over Range

Low Battery Warning

• Affected channel’s gas reading is
replaced with a flashing

• Gas name and units flash

• M OVER appears at the bottom of
the LCD

• Alarm LEDs flash twice per
second

• Backlight turns on

• The last bar in the battery icon
disappears and the battery icon
starts flashing

• High-low tone sounds
twice per second

• Vibrator pulses twice
per second

• High-low tone sounds
twice per second

• Vibrator pulses twice
per second

None

Dead Battery Alarm

Sensor Failure

Clock Failure

System Failure

• Gas reading disappears. FAIL
BATTERY appears on the LCD.

• Alarm LEDs flash once per
second

• FAIL S E NSOR appears on the
LCD.

• Alarm LEDs flash once per
second

• FAIL 050 CLOCK appears on the
LCD

• Alarm LEDs flash once per
second

• FAIL SYSTEM and an error code
appear on the LCD

• Alarm LEDs flash once per
second

Double pulsing tone
sounds once per second

Double pulsing tone
sounds once per second

Double pulsing tone
sounds once per second

Double pulsing tone
sounds once per second

GasWatch 3 for Carbon Monoxide (Hydrogen-Compensated) Chapter 3: Measuring Mode • 24

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Responding to Alarms

This section describes response to gas, over range, battery, sensor failure, clock failure, and
system failure alarms.

Responding to Gas Alarms

1. Follow your established procedure for an increasing gas condition.

2. Reset the alarm as necessary or allowed. a. If LATCH is set to ON (factory setting) in Maintenance Mode, the gas reading must fall

below an alarm setting before you can reset the alarm condition using POWER/MODE or
AIR.
If Password Protection is set to On using the GW-3 Config Program, you must press
AIR and POWER/MODE at the same time and then enter a user-set password to reset the
gas alarm.

b. If LATCH is set to OFF in Maintenance Mode, the alarm condition automatically resets

when gas reading falls below an alarm setpoint.

Responding to an H2 RICH Alarm

The H2 RICH alarm automatically clears once the hydrogen level decreases below 2000 ppm
(parts per million).

Responding to Over Range Alarms

WARNING: An over range condition may indicate an extreme carbon monoxide

concentration or an explosive concentration. Confirm the gas concentration with
a different GasWatch 3 or with another gas detecting device.

AVERTISSEMENT: Un dépassement de la plage peut indiquer une concentration extrême en

monoxyde de carbone ou une concentration en explosif. Confirmez la
concentration de gaz avec un GasWatch 3 différent ou avec un autre
dispositif de détection de gaz.

1. Follow your established procedure for an extreme gas condition.

2. Reset the alarm using POWER/MODE or AIR once the alarm condition clears if LATCH is

set to ON (factory setting) in Maintenance Mode.

If Password Protection is set to On using the GW-3 Config Program, you must press AIR
and POWER/MODE at the same time and then enter a user-set password to reset the over
range alarm.

3. Calibrate the GasWatch 3 as described on page 47.

4. If the over range condition continues or if you are not able to successfully calibrate the unit,

you may need to replace the sensor.

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5. If the over range condition continues after you replace the sensor, contact RKI Instruments,

CLOCK

050

FAIL

Inc. for further instructions.

Responding to Battery Alarms

WARNING: The GasWatch 3 is not operational as a gas monitoring device during a dead

battery alarm. Take the GasWatch 3 to a non-hazardous area and replace the
battery as described in “Replacing the Battery” on page 77.

The GasWatch 3 is fully functional during a low battery warning. However, only 10 days of
operating time remain. The amount of time depends on LCD backlight use and alarm frequency.
Replace the battery as described on page 77 as soon as possible.

NOTE: Alarms and the LCD backlight consume battery power and reduce the amount of

operating time remaining.

Responding to Sensor Failure Alarms

1. Calibrate the sensor as described on page 47.

2. If the sensor failure continues, replace the sensor as described on page 81.

3. If the sensor failure condition continues after replacing the sensor, contact RKI Instruments,

Inc. for further instructions.

Responding to Clock Failure Alarms

A clock failure alarm occurs if the unit’s internal clock malfunctions.

1. Press and release POWER/MODE to continue into Measuring Mode.

CAUTION: There is no datalogging function if you operate the instrument after a clock failure.

2. Attempt to set the date using the DATE item in User Mode (see page 73).

3. If the date cannot be set correctly, contact RKI Instruments, Inc. as soon as possible.

GasWatch 3 for Carbon Monoxide (Hydrogen-Compensated) Chapter 3: Measuring Mode • 26

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Responding to System Failure Alarms

SYSTEM

031

FAIL

1. If a system failure occurs, the system failure screen displays an error code as shown below:

2. The error code meanings are shown in the table below:

Table 5: Error Code Explanation

Error Code Explanation

000 ROM failure

010 RAM failure

020 FRAM failure

031 FLASH memory failure

082 Temperature sensor failure

3. If the error code is anything but 031, the instrument cannot be used. Contact RKI Instruments,

Inc. as soon as possible.

If the error code is 031, press and release POWER/MODE to continue into Measuring
Mode if the instrument must be used temporarily.

CAUTION: There is no datalogging function if you operate the instrument after a 031 system

failure. Contact RKI Instruments, Inc. as soon as possible.

27 • Chapter 3: Measuring Mode GasWatch 3 for Carbon Monoxide (Hydrogen-Compensated)

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Data Logging

The GasWatch 3 logs Measuring Mode gas readings, alarm data, and calibration data to its
internal memory. Logged data can be download it to a computer via the infrared communications
port on the front of the unit.

The data logging capacity depends on how often the GasWatch 3 stores data and how often the
GasWatch 3 is turned on and off. The table below illustrates how much data logging time is
available for the various interval times. It assumes that the unit is only turned on once and there
are no alarms. The data logging interval time must be set using the GasWatch 3 Datalogging
Program.

Table 6: Data Logging Capacity

Interval
Time

10 seconds 10 hours

20 seconds 20 hours

30 seconds 30 hours

1 minute 60 hours

3 minutes 180 hours

5 minutes 300 hours

10 minutes 600 hours

Data Logging
Capacity

To utilize the GasWatch 3’s downloading capability, you need:

• PC with Windows 7, Windows 8, or Windows 10

• IrDA port or IrDA/USB cable (cable available from RKI Instruments, Inc.)

• GasWatch 3 Datalogging Program

For a complete description of the Datalogging Program and procedures for downloading data to a
computer, see the GasWatch 3 Datalogging Program Operator’s Manual.

GasWatch 3 for Carbon Monoxide (Hydrogen-Compensated) Chapter 3: Measuring Mode • 28

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Chapter 4: Display Mode

This section describes Display Mode which is accessible from Measuring Mode. See Table 7
below for a list of Display Mode’s menu items, a short description of each item, and the page
number for further description.

Table 7: Display Mode Menu Items

Display Mode
Menu Item

Description

PEAK (page 30) Displays the Peak reading.

STEL (page 31) Displays the STEL reading.

TWA (page 31) Displays the TWA reading.

USER ID (page

A

32)

STN ID (page

A

32)

CAL.DATA

(page 33)

B

BP.DATA (page

C

34)

View and/or change the User ID.

View and/or change the Station ID.

Displays the last calibration date.

Displays the last bump test date.

DATE (page 35) Displays the current date and time.

TEMP (page 35) Displays the current temperature.

ALARM--P

View alarm points.

(page 35)

BUZZ.VOL

(page 36)

A

Only appears if DISP.SET is set to ON in User Mode (factory setting) and if ID DISP is set to

D

Set the buzzer volume to LO or HI (factory setting).

ON in Maintenance Mode (factory setting is OFF).

B

Only appears if CAL.RMDR is set to ON in User Mode (factory setting).

C

Only appears if BP.RMDR is set to ON in User Mode (factory setting is OFF).

D

Only appears if DISP.SET is set to ON in User Mode (factory setting).

29 • Chapter 4: Display Mode GasWatch 3 for Carbon Monoxide (Hydrogen-Compensated)

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Tips for Using Display Mode

PEAK

135

CO

ppm

• To enter Display Mode and scroll from one item to the next or skip an item when a question is asked, press and release POWER/MODE.

• To enter an item, press and release AIR.

• To change a flashing parameter, press and release AIR. To reverse the movement in a list (ie. from down to up or vice versa):

a. Press and hold AIR.
b. Immediately press POWER/MODE and then release both buttons.

• To exit from an entered-information screen and go back to Measuring Mode, press and release POWER/MODE until you get to the Measuring Mode screen.

NOTE: Each screen displays for 20 seconds. If you do not press a button within 20 seconds, the

GasWatch 3 automatically returns to Measuring Mode.

Peak Screen (PEAK)

The peak screen displays the highest concentration detected since the GasWatch 3 was turned on.
The peak reading is stored until a higher level is detected, the peak reading is cleared, or the
GasWatch 3 is turned off.

The lunch break feature enables the GasWatch 3 to save the peak reading when it is turned off so
it can continue with the same peak when it is turned on again (see page 15).

To clear the peak reading, do the following:

NOTE: If Password Protection is set to On using the GW-3 Series Setup Program, the peak

reading cannot be cleared.

1. After entering Display Mode, press and release POWER/MODE until PEAK appears.

GasWatch 3 for Carbon Monoxide (Hydrogen-Compensated) Chapter 4: Display Mode • 30

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2. Press and hold AIR until the screen prompts you to release it.

HOLD

CLR

RELEASE

CLR

STEL

10

CO

ppm

TWA

5

CO

ppm

3. The peak reading is reset and the unit returns to the Peak Screen.

If you do not want to clear the peak reading, release AIR before the above screen sequence
occurs. The unit returns to the Peak Screen.

STEL Screen (STEL)

The STEL Screen displays the short term exposure limit (STEL) reading. The STEL reading is the
average reading over the last 15 minutes.

TWA Screen (TWA)

The TWA Screen displays the time weighted average (TWA) reading.

The TWA reading is the average reading over the last 8 hours. If 8 hours have not elapsed since
the last time the TWA reading was cleared, the average is still calculated over 8 hours. The
missing readings are assigned a value of 0. If LUNCH is set to OFF (factory setting), the TWA is
cleared when the GasWatch 3 is turned off.

If LUNCH is set to ON, the GasWatch 3 remembers the TWA reading when it is turned off and
can continue accumulation when it is turned on again (see page 15).

31 • Chapter 4: Display Mode GasWatch 3 for Carbon Monoxide (Hydrogen-Compensated)

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Changing the User ID (USER ID)

UID_001

Id

USER

CHG / AIR

Id

USER

NO / MODE

Id

USER

UID_001

Id

USER

This screen only appears if DISP.SET in User Mode is set to ON (factory setting) and if ID DISP
in Maintenance Mode is set to ON (factory setting is OFF).

Use this screen to select a user ID from the 128 user IDs that are stored in the GasWatch 3’s
memory. Before a user ID is selected on a brand new instrument, the user ID is “----------”. The
factory-installed user IDs have a “U_ID_XXX” format.

The user ID provides a way to identify the GasWatch 3 user during a data logging session.

User IDs can only be selected in this menu item. In order to edit the 128 user IDs, you must use
the GasWatch 3 Datalogging Program or GasWatch 3 Setup Program.

1. After entering Display Mode, press and release POWER/MODE until the USER ID screen sequence appears.

2. To change the User ID, press and release AIR. The current User ID flashes.

3. Use AIR to scroll to the desired User ID.

4. Press and release POWER/MODE to save the User ID and return to the USER ID screen in Display Mode.

Changing the Station ID (STN ID)

This screen only appears if DISP.SET in User Mode is set to ON (factory setting) and if ID DISP
in Maintenance Mode is set to ON (factory setting is OFF).

Use this screen to select a station ID from the 128 station IDs that are stored in the GasWatch 3’s
memory. Before a station ID is selected on a brand new instrument, the station ID is

GasWatch 3 for Carbon Monoxide (Hydrogen-Compensated) Chapter 4: Display Mode • 32

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“----------”. The factory-installed station IDs have a “S_ID_XXX” format.

The station ID provides a way to identify the GasWatch 3 location during a data logging session.

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Station IDs can only be selected in this menu item. In order to edit the 128 station IDs, you must

SID_001

Id

StN

CHG / AIR

Id

StN

NO / MODE

Id

StN

SID_001

Id

StN

CAL .DATA

dISP

YES / AIR

dISP

NO / MODE

dISP

use the GasWatch 3 Datalogging Program or GasWatch 3 Setup Program.

1. After entering Display Mode, press and release POWER/MODE until the STN ID screen sequence appears.

2. To change the station ID, press and release AIR. The current station ID flashes.

3. Use AIR to scroll to the desired station ID.

4. Press and release POWER/MODE to save the station ID and return to the STN ID screen in Display Mode.

Last Successful Calibration Date (CAL.DATA)

The CAL.DATA screen shows the date of the last successful calibration. This screen only appears
if CAL.RMDR is set to ON (factory setting).

1. After entering Display Mode, press and release POWER/MODE until the CAL.DATA screen sequence appears.

33 • Chapter 4: Display Mode GasWatch 3 for Carbon Monoxide (Hydrogen-Compensated)

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2. Press AIR to enter the CAL.DATA screen. The date of the last successful calibration displays.

CAL .DATA

1 . 1

2019

BP .DATA

dISP

YES / AIR

dISP

NO / MODE

dISP

BP .DATA

1 . 1

2019

3. Press and release POWER/MODE to return to the CAL.DATA screen in Display Mode.

Last Successful Bump Test Date (BP.DATA)

The BP.DATA screen shows the date of the last successful bump test. This screen only appears if
BP.RMDR is set to ON (factory setting is OFF).

1. After entering Display Mode, press and release POWER/MODE until the BP.DATA screen sequence appears.

2. Press AIR to enter the BP.DATA screen. The date of the last successful bump test displays.

3. When you are done viewing the last bump test date, press and release POWER/MODE to return to the BP.DATA screen in Display Mode.

GasWatch 3 for Carbon Monoxide (Hydrogen-Compensated) Chapter 4: Display Mode • 34

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Date/Time Screen (DATE)

10:42

2 .13

2019

TEMP

24C

ALARM--P

dISP

YES / AIR

dISP

NO / MODE

dISP

The DATE screen shows the instrument’s date and time.

Temperature Screen (TEMP)

The TEMP screen shows the surrounding area’s temperature.

Alarm Points Screen (ALARM--P)

The Alarm Points Screen shows the gas alarm settings.

1. After entering Display Mode, press and release POWER/MODE until the ALARM--P screen sequence appears.

2. Press and release AIR. The Full Scale Setting screen appears.

35 • Chapter 4: Display Mode GasWatch 3 for Carbon Monoxide (Hydrogen-Compensated)

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3. Use AIR to scroll through the Warning, Alarm, Alarm H, STEL, and TWA settings.

F .S .

1000

CO

ppm

WARNING

25

CO

ppm

ALARM

50

CO

ppm

ALARM H

1200

CO

ppm

STEL

200

CO

ppm

TWA

25

CO

ppm

AIR AIR

AIR AIR

AIR

AIR

BUZZ .VOL

HI

CHG / AIR

HI

NO / MODE

HI

4. Press and release POWER/MODE to return to the Alarm Points Screen.

Adjusting the Buzzer Volume (BUZZ.VOL)

The BUZZ.VOL screen allows you to adjust the volume of the instrument’s buzzer. This screen
only appears if DISP.SET in User Mode is set to ON (factory setting).

HI (factory setting): Buzzer volume is high.

LO: Buzzer volume is low.

1. While in Display Mode, press and release POWER/MODE until BUZZ.VOL appears. The current setting displays on the top line.

GasWatch 3 for Carbon Monoxide (Hydrogen-Compensated) Chapter 4: Display Mode • 36

2. Press and release AIR. The current setting flashes.

3. Use AIR to display the desired setting.

4. Press and release POWER/MODE to save the setting and return to the BUZZ.VOL item in Display Mode.

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Chapter 5: User Mode and Calibration

Overview

This section describes the GasWatch 3 in User Mode. See Table 8 below for a list of the items
found in User Mode, the page that the item’s instructions can be found on, and a short description
of the item.

Table 8: User Mode Menu Items

User Mode
Menu Item

BUMP (page 42) Perform a bump test.

GAS CAL (page 47) Perform a fresh air adjustment, perform a span adjustment, change the calibration

Description

BUMP
CYL X

START Begin the warmup sequence and enter Measuring Mode.

ESCAPE Return to the BUMP menu item.

gas concentration.

AIR (page

47)

A-CAL
(page 48) or
E-CAL (page

50) depend-

ing on E-
CAL User
Mode setting

Perform a bump test on the gas selected for Cylinder X
(Cylinders A-E available).

Perform a fresh air adjustment.

A-CAL (or
E-CAL)
CYL X

START Begin the warmup sequence and enter Measuring

CAL-P Set the calibration gas concentration.

Perform a span adjustment on the gas selected for
Cylinder X (Cylinders A-E available).

Mode.

CYL SEL Assign a cylinder (A-E) to each gas. CO is

assigned to Cylinder A and H
der B by default.

ESCAPE Return to the A-CAL item in the GAS CAL menu.

ESCAPE Return to the GAS CAL item in User Mode.

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is assigned to Cylin-

2

Table 8: User Mode Menu Items

User Mode
Menu Item

CAL SET (page 59) Change parameters related to calibration.

Description

CAL.RMDR
(page 59)

CAL.INT
(page 60)

CAL.EXPD
(page 60)

ESCAPE Return to the CAL SET item in User Mode.

(factory setting): The instrument notifies the user upon startup

ON

when a calibration is due. Notification type depends on
CAL.EXPD setting below. CAL.DATA screen appears in Display
Mode.

OFF

: No notification upon startup when a calibration is due.

CAL.DATA screen does not appear in Display Mode.

How often the instrument needs to be calibrated.
Options: 1 - 1000 days (factory setting is 90 days)

Defines what action must be taken if a calibration is due upon
startup.

CONFIRM

edge that calibration is due and continue to Measuring Mode.

CANT.USE

bration is performed.

NONE

sequence continues.

(factory setting): Press and release AIR to acknowl-

: Cannot enter Measuring Mode until a successful cali-

: A screen indicates that calibration is due but warmup

BUMP.SET (page 61) Change parameters related to bump testing.

SETTING
(page 61)

GAS.TIME How long gas is applied during a bump test.

Choices: 30 (factory setting), 45, 60, 90 seconds

CHECK Percentage of calibration gas concentration that the

bump test reading must be within in order to pass
bump.
Options: 10%, 20%, 30%, 40%, 50% (factory
setting)

CAL.TIME How long gas is applied during a calibration.

GAS.TIME is deducted from this time.
Options: 90 (factory setting) or 120 seconds

A-CAL ON

ESCAPE Return to the SETTING item in the BUMP SET

(factory setting): If a bump test fails, a calibra-

tion automatically starts.

OFF

: If a bump test fails, a calibration does not

automatically start.

menu.

GasWatch 3 for Carbon Monoxide (Hydrogen-Compensated) Chapter 5: User Mode and Calibration • 38

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Table 8: User Mode Menu Items

User Mode
Menu Item

BUMP SET (page 61)
(cont’d)

ALARM-P (page 66) Set alarm points (WARNING, ALARM, ALARM H, STEL, TWA) and/or reset all

Description

BP.RMDR
(page 64)

BP.INT
(page 64)

BP.EXPD
(page 65)

ESCAPE Return to the BUMP SET item in User Mode.

alarms to their default settings.

ON: The instrument notifies the user upon startup when a bump
test is due. Notification type depends on BP.EXPD setting below.

BP.DATA screen appears in Display Mode.
OFF

(factory setting): No notification upon startup when a bump

test is due. BP.DATA screen does not appear in Display Mode.

How often the instrument needs to be bump tested.
Options: 0 - 30 days (factory setting is 30 days)

Defines what action must be taken if a bump test is due upon
startup.

CONFIRM

edge that bump test is due and continue to Measuring Mode.

CANT.USE

bump test is performed.

NONE

sequence continues.

(factory setting): Press and release AIR to acknowl-

: Cannot enter Measuring Mode until a successful

: A screen indicates that bump test is due but warmup

LUNCH (page 68) ON

BEEP (page 69) Set confirmation beep parameters.

: Lunch break feature is on. Instrument asks if you want to resume TWA and

PEAK readings at startup.

OFF

(factory setting): Lunch break feature is off. Instrument resets TWA and

PEAK readings every time it’s turned on.

BEEP.SEL
(page 69)

BEEP.INT
(page 70)

: LEDs flash and instrument vibrates based on interval

LED
defined in BEEP.INT to confirm instrument is still operating.
BUZZER
val defined in BEEP.INT to confirm instrument is still operating.
LED+BUZ

based on interval defined in BEEP.INT to confirm instrument is
still operating.

BMP/CAL

bump test or calibration is due regardless of whether BP.RMDR
and/or CAL.RMDR are set to ON.

OFF

ating or that a bump test or calibration is due.

Confirmation alert interval. Confirmation type defined in
BEEP.SEL.
Options: 0.5 minute and 1 to 99 minutes in 1 minute increments.
The factory setting is 5 minutes.

: Buzzer sounds and instrument vibrates based on inter-

: LEDs flash, buzzer sounds, and instrument vibrates

: LEDs flash based on interval defined in BEEP.INT if

(factory setting): No alerts to confirm instrument is still oper-

ESCAPE Return to the BEEP item in User Mode.

39 • Chapter 5: User Mode and Calibration GasWatch 3 for Carbon Monoxide (Hydrogen-Compensated)

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Table 8: User Mode Menu Items

User Mode
Menu Item

BL TIME (page 71) How long the back light stays on after the last button press.

KEY.TONE (page 71) ON

DISP.SET (page 72) OFF

ZERO.SUP (page

72)*

ZERO.FLW (page

72)**

E-CAL (page 73) XX seconds

DATE (page 73) Set the instrument’s date and time.

PASS-W (page 74) ON

Description

Options: 0 - 255 seconds or OFF. The factory setting is 30 seconds.

(factory setting): Buzzer sounds when button is pressed.

OFF

: Buzzer does not sound when button is pressed.

: USER ID, STN ID, and BUZZ.VOL items do not appear in Display Mode.

ON

(factory setting): BUZZ.VOL item appears in Display Mode. USER ID and

STN ID items appear if ID DISP in Maintenance Mode is also set to ON.

(factory setting): Not intended for field adjustment. The suppression value is 2

ON

ppm.

(factory setting): Not intended for field adjustment.

ON

: E-CAL appears in GAS CAL instead of A-CAL.

OFF

(factory setting): E-CAL does not appear in GAS CAL.

: User Mode is password-protected. Factory-set password is 0405.

OFF

(factory setting): User Mode is not password-protected.

ROM/SUM (page 75) View the firmware information for the GasWatch 3’s sensor board and main board.

START (page 75) Press and release POWER/MODE to begin the warmup sequence and enter Mea-

suring Mode.

* Only appears if ZSUP.DSP is set to ON in Maintenance Mode.

** Only appears if ZFLW.DSP is set to ON in Maintenance Mode.

Entering User Mode

WARNING: The GasWatch 3 is not in operation as a gas detector while in User Mode.

1. Take the GasWatch 3 to a non-hazardous location and turn it off if it is on.

2. Press and hold AIR, then press and hold POWER/MODE. When you hear a beep, release the buttons.

GasWatch 3 for Carbon Monoxide (Hydrogen-Compensated) Chapter 5: User Mode and Calibration • 40

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3. The screen that appears depends on the setting of User Mode’s PASS-W item.

PASS-W set to OFF PASS-W set to ON

BUMP

PASS - W

0 0 0 0

BUMP

If PASS-W is set to OFF (factory setting), continue with Step 6.

If PASS-W is set to ON, continue with Step 4.

4. If PASS-W is set to ON in User Mode, a password screen appears and the first digit flashes. The factory-set password is 0405 but it can be changed.

5. Use AIR to select each password number then press POWER/MODE to save it and move on
to the next number. To go back a number, press and hold AIR and POWER/MODE for a few
seconds. To reverse the direction of change (ie. from increasing to decreasing or vice versa):

a. Press and hold AIR.
b. Immediately press POWER/MODE and then release both buttons.

6. The BUMP item displays.

7. Use AIR to move through the User Mode items.

Tips for Using User Mode

• To scroll from one item to the next, press and release AIR. To reverse the scrolling direction:
a. Press and hold AIR.
b. Immediately press POWER/MODE and then release both buttons.
c. The scrolling direction returns to the original direction when you exit and reenter a menu.

• To skip an item when a question is asked, press and release AIR.

• To enter an item and to save any changes, press and release POWER/MODE.

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• To change a flashing parameter, press and release AIR. To reverse the direction of change (ie.

from increasing to decreasing or vice versa):

a. Press and hold AIR.
b. Immediately press POWER/MODE and then release both buttons.

• To exit an entered item without saving a change, press and hold AIR and POWER/MODE for a

few seconds.

Performing a Bump Test (BUMP)

Bump test the instrument before each day’s use with a known concentration of the target gas. The
instrument does not need to be calibrated unless it does not pass the bump test.

To bump test the GasWatch 3, you need:

• Calibration gas cylinder (RKI Instruments recommends using 50 ppm CO)

• 0.25 LPM fixed flow regulator

• Non-absorbent tubing

• Calibration cup

1. Confirm that the GasWatch 3’s calibration gas value matches the concentration listed on the calibration gas cylinder as described on page 55.

2. Confirm that the regulator knob is turned all the way clockwise. Screw the 0.25 LPM fixed flow regulator onto the calibration cylinder.

3. Install the calibration cup onto the GasWatch 3. The calibration cup has an indicated flow direction. Be sure the calibration cup is installed in the correct direction and that it is pushed on all the way.

4. Use the tubing to connect the regulator to the inlet of the calibration cup.

GasWatch 3 for Carbon Monoxide (Hydrogen-Compensated) Chapter 5: User Mode and Calibration • 42

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5. While in User Mode, press AIR to scroll to BUMP.

BUMP

BUMP

50

CO

ppm

CYL A

50

CO

ppm

APLY 30

0

CO

ppm

BUMP 30

0

CO

ppm

6. Press and release POWER/MODE. The display shows the gas assigned to Cylinder A and its
assigned calibration value (see page 55 if the calibration value does not match the calibration
gas cylinder’s concentration). The bottom of the screen alternates between “CYL A” and
“BUMP”.

7. If necessary, use AIR to scroll to the Bump screen for the gas you want to bump test. As shipped from the factory, CO is assigned to Cylinder A and H2 is assigned to Cylinder B. The H2 response does not need to be bump tested.

8. Turn the regulator knob counterclockwise to open the regulator.

9. Press and release POWER/MODE.

10. The gas reading flashes, the bottom of the screen alternates between “APLY” and “BUMP”, and the bottom of the screen counts down from the time set in BUMP.SET\SETTING\GAS.TIME.

To back out of the gas application screen without performing the bump test, press and
release AIR and POWER/MODE together.

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11. At the end of the countdown, the instrument analyzes the results. Follow the flow chart to

Figure 5: Bump Test Flow Chart

Bump test passed?

Y N

A-CAL On?

Calibration passed?

Y N

(default is on)

B

C D

Y N

A

determine the bump test outcome.

GasWatch 3 for Carbon Monoxide (Hydrogen-Compensated) Chapter 5: User Mode and Calibration • 44

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Option A from Flow Chart Option B from Flow Chart

AIR

BMP/CAL

P

CO

ppm

BMP /

47

CO

ppm

AIR

BMP/CAL

F

CO

ppm

BMP /

5

CO

ppm

• Bump test passed • Bump test failed

• A-CAL set to OFF (factory setting is
ON)

1. The instrument indicates that the channel passed the bump test. Use AIR to scroll between the bump test result and the bump test gas reading.

2. Close the regulator.

3. Unscrew the regulator.

4. Remove the calibration cup.

5. Press and release POWER/MODE to return to the BUMP CYL B screen in the BUMP menu.

6. Use AIR to scroll to START and press and release POWER/MODE to enter Measuring Mode.

1. The instrument shows which channels passed or failed the bump test. The LEDs flash and the buzzer sounds. Use AIR to scroll between the result and the reading.

2. Close the regulator.

3. Unscrew the regulator.

4. Remove the calibration cup.

5. Press and release POWER/MODE to return to the BUMP CYL A screen in the BUMP menu.

6. Use AIR to scroll to START and press and release POWER/MODE to enter Measuring Mode.

7. Calibrate the GasWatch 3 as soon as possible.

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Option C from Flow Chart Option D from Flow Chart

APLY 60

15

CO

ppm

CAL 60

15

CO

ppm

AIR

AIR

BMP / CAL

F P

CO

ppm

BMP /

15

CO

ppm

/ CAL

45

CO

ppm

APLY 60

0

CO

ppm

CAL 60

0

CO

ppm

AIR

AIR

BMP / CAL

F F

CO

ppm

BMP /

0

CO

ppm

/ CAL

5

CO

ppm

•Bump test failed

• A-CAL set to ON (factory setting)

• Calibration passed

1. A calibration immediately and automatically starts. Continue to apply the calibration gas.

2. The calibration time is the difference between the GAS.TIME and the CAL.TIME values defined in the BUMP.SET\SETTING item in User Mode.

3. The instrument shows the pass/fail results of the bump test/calibration. Use AIR to scroll between the results and the readings.

• Bump test failed

• A-CAL set to ON (factory setting)

• Calibration failed

1. A calibration immediately and automatically starts. Continue to apply the calibration gas.

2. The calibration time is the difference between the GAS.TIME and the CAL.TIME values defined in the BUMP.SET\SETTING item in User Mode.

3. The instrument shows the pass/fail results of the bump test/calibration. The LEDs flash and the buzzer sounds. Use AIR to scroll between the results and the readings.

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GasWatch 3 for Carbon Monoxide (Hydrogen-Compensated) Chapter 5: User Mode and Calibration • 46

4. Close the regulator.

5. Unscrew the regulator.

6. Remove the calibration cup.

7. Press and release POWER/MODE to return to the BUMP CYL B screen in the BUMP menu.

8. Use AIR to scroll to START and press and release POWER/MODE to enter Measuring Mode.

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4. Close the regulator.

5. Unscrew the regulator.

6. Remove the calibration cup.

7. Press and release POWER/MODE to return to the BUMP CYL A screen in the BUMP menu.

8. Use AIR to scroll to START and press and release POWER/MODE to enter Measuring Mode.

Performing a Calibration (GAS CAL)

GAS CAL

AIR

• Bump test the instrument before each day’s use with a known concentration of the target gas. A
bump test can be done in User Mode’s BUMP item or by applying gas in Measuring Mode.
The instrument does not need to be calibrated unless it does not pass the User Mode bump test
or does not respond appropriately, as defined by the user, in Measuring Mode.

• The hydrogen response for the H2-compensated CO sensor must be set both monthly and after
the sensor is replaced.

• To fully calibrate the sensors, perform a fresh air adjustment (AIR CAL) and a span
adjustment (A-CAL or E-CAL).

• The GasWatch 3 can be calibrated using either A-CAL or E-CAL depending on the setting of
the E-CAL User Mode item.

• A-CAL (appears if E-CAL User Mode item is set to OFF): Apply gas for a period of time,
then press and release POWER/MODE to perform the adjustment.

• E-CAL (appears if E-CAL User Mode item is set to something besides OFF): As soon as gas
is applied and the reading reaches 10% of the auto calibration value, the instrument counts
down from the number of seconds specified in the E-CAL User Mode item and automatically
performs the adjustment.

Performing a Fresh Air Adjustment (AIR)

1. Find a fresh air environment, an environment of normal oxygen content (20.9%) that is free of

toxic and combustible gases.

2. While in User Mode, press AIR to scroll to GAS CAL.

3. Press and release POWER/MODE. The AIR item appears.

47 • Chapter 5: User Mode and Calibration GasWatch 3 for Carbon Monoxide (Hydrogen-Compensated)

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4. Press and release POWER/MODE to enter the AIR menu.

AIR

0

CO

ppm

HOLD

Air

RELEASE

AdJ

5. To return to the AIR menu without performing a fresh air adjustment, press and release

POWER MODE.

6. Press and hold AIR until the screen prompts you to release it.

7. If the fresh air adjustment passes, the instrument returns to the AIR item in the GAS CAL

menu.

8. If the fresh air adjustment fails, “FAIL AIR” displays. Press and release POWER/MODE to

acknowledge the failure. See page 76.

Performing a Span Adjustment in A-CAL

The A-CAL item only appears if E-CAL in User Mode is set to OFF (factory setting). If E-CAL
is set to ON, see page 50 for calibration instructions.

Preparing for Span Adjustment

To adjust the span on the GasWatch 3, you need:

• Calibration gas cylinder (RKI Instruments recommends using 50 ppm CO)

• If you are setting the H2 response for the H2-compensated CO sensor (which needs to be
calibrated both monthly and after the sensor is replaced), a cylinder of 200 ppm H2 is
recommended.

• 0.25 LPM fixed flow regulator

• Non-absorbent tubing

• Calibration cup

1. Confirm that the GasWatch 3’s calibration gas value matches the concentration listed on the calibration gas cylinder as described on page 55.

2. Confirm that the regulator knob is turned all the way clockwise. Screw the 0.25 LPM fixed flow regulator onto the calibration cylinder.

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3. Install the calibration cup onto the GasWatch 3. The calibration cup has an indicated flow

GAS CAL

A-CAL

A-CAL

50

CO

ppm

CYL A

50

CO

ppm

direction. Be sure the calibration cup is installed in the correct direction and that it is pushed
on all the way.

4. Use the tubing to connect the regulator to the inlet of the calibration cup.

Performing a Span Adjustment

1. While in User Mode, press AIR to scroll to GAS CAL.

2. Press and release POWER/MODE. The AIR item appears.

3. Use AIR to scroll to the A-CAL item.

4. Press and release POWER/MODE. The display shows the gas assigned to Cylinder A and its
assigned calibration value (see page 55 if the calibration value does not match the calibration
gas cylinder’s concentration). The bottom of the screen alternates between “CYL A” and “A­CAL”.

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5. If necessary, use AIR to scroll to the Auto Cal screen for the gas you want to calibrate. As

APPLY

0

CO

ppm

A-CAL

0

CO

ppm

shipped from the factory, CO is assigned to Cylinder A and H2 is assigned to Cylinder B.

6. Press and release POWER/MODE.

7. The gas reading flashes and the bottom of the screen alternates between “APPLY” and “A­CAL”.

NOTE: To back out of the gas application screen without performing the calibration,

press and release AIR and POWER/MODE together.

8. Turn the regulator knob counterclockwise to open the regulator.

9. Allow the gas to flow for 1 minute.

10. Press and release POWER/MODE.

11. The table on page 54 describes the 2 calibration outcomes.

Performing a Span Adjustment in E-CAL

The E-CAL item only appears if E-CAL in User Mode is set to ON (factory setting is OFF). If
E-CAL is set to OFF, see page 48 for calibration instructions.

Preparing for Span Adjustment

To adjust the span on the GasWatch 3, you need:

• Calibration gas cylinder (RKI Instruments recommends using 50 ppm CO)

• If you are setting the H2 response for the H2-compensated CO sensor (which needs to be
calibrated both monthly and after the sensor is replaced), a cylinder of 200 ppm H2 is
recommended.

• 0.25 LPM fixed flow regulator

• Non-absorbent tubing

• Calibration cup

1. Confirm that the GasWatch 3’s calibration gas value matches the concentration listed on the calibration gas cylinder as described on page 55.

2. Confirm that the regulator knob is turned all the way clockwise. Screw the 0.25 LPM fixed flow regulator onto the calibration cylinder.

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3. Install the calibration cup onto the GasWatch 3. The calibration cup has an indicated flow

GAS CAL

E-CAL

E-CAL

50

CO

ppm

CYL A

50

CO

ppm

direction. Be sure the calibration cup is installed in the correct direction and that it is pushed
on all the way.

4. Use the tubing to connect the regulator to the inlet of the calibration cup.

Performing a Calibration

1. While in User Mode, press AIR to scroll to GAS CAL.

2. Press and release POWER/MODE. The AIR item appears.

3. Use AIR to scroll to the E-CAL item.

4. Press and release POWER/MODE. The display shows the gas assigned to Cylinder A and its
assigned calibration value (see page 55 if the calibration value does not match the calibration
gas cylinder’s concentration). The bottom of the screen alternates between “CYL A” and “E­CAL”.

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5. If necessary, use AIR to scroll to the Easy Cal screen for the gas you want to calibrate. As

GAS IN

0

CO

ppm

CAL 60

12

CO

ppm

APLY 60

12

CO

ppm

shipped from the factory, CO is assigned to Cylinder A and H2 is assigned to Cylinder B.

6. Press and release POWER/MODE.

7. The gas reading flashes and the bottom of the screen says “GAS IN”.

8. Turn the regulator knob counterclockwise to open the regulator.

9. Once the gas reading reaches 10% of the auto calibration value, the screen starts counting down from the time specified in the E-CAL User Mode item. In the example below, E-CAL is set to 60 seconds.

To back out of the gas application screen without performing the calibration, press and
release AIR and POWER/MODE together.

If the reading never reaches 10% of the auto calibration value, press and release POWER/
MODE to fail the calibration.

10. At the end of the countdown, the instrument makes the span adjustment.

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11. The table below describes the 2 calibration outcomes.

E-CAL

PASS

E-CAL

51

CO

ppm

MAX.SPAN

91

CO

ppm

E-CAL

FAIL

CO

ppm

Calibration Passed Calibration Failed

1. The instrument indicates that the calibration passed.

2. The instrument shows the current gas reading.

3. If MAX.SPAN is set to ON (default is
OFF, see page 101), the response
reading’s maximum adjustment is
displayed. A maximum span of 100
ppm indicates that the reading could
have been adjusted up to 100 ppm. If
the maximum span value is close to
the calibration gas value, the sensor
should be replaced soon.
The maximum adjustment is either
twice the calibration value or full
scale, whichever is lower.

1. The instrument indicates that the calibration failed.

2. Close the regulator.

3. Unscrew the regulator.

4. Remove the calibration cup.

5. Press and release POWER/MODE to return to the E-CAL CYL A screen in the E-CAL menu.

6. See “Troubleshooting” on page 76.

4. Close the regulator.

5. The instrument continues to the E­CAL CYL B screen.

6. If you are calibrating the H2 response, unscrew the regulator from the CO cylinder and screw it into the H2 cylinder.

7. Press and release POWER/MODE to start the H2 calibration.

8. Repeat Step 8 through Step 11.

9. After the H2 response is calibrated, the instrument continues to the START item in the E-CAL menu.

10. If you did not calibrate the H2 response, use AIR to scroll to the START item in the E-CAL menu.

11. Remove the calibration cup.

12. Press and release POWER/MODE to

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Calibration Passed Calibration Failed

A-CAL

PASS

A-CAL

51

CO

ppm

MAX.SPAN

91

CO

ppm

A-CAL

FAIL

CO

ppm

1. The instrument indicates that the calibration passed.

2. The instrument shows the current gas reading.

3. If MAX.SPAN is set to ON (default is
OFF, see page 101), the response
reading’s maximum adjustment is
displayed. A maximum span of 100
ppm indicates that the reading could
have been adjusted up to 100 ppm. If
the maximum span value is close to
the calibration gas value, the sensor
should be replaced soon.

1. The instrument indicates that the calibration failed.

2. Close the regulator.

3. Unscrew the regulator.

4. Remove the calibration cup.

5. Press and release POWER/MODE to return to the A-CAL CYL A screen in the A-CAL menu.

6. See “Troubleshooting” on page 76.

The maximum adjustment is either
twice the calibration value or full
scale, whichever is lower.

4. Close the regulator.

5. The instrument continues to the A- CAL CYL B screen.

6. If you are calibrating the H

response,

2

unscrew the regulator from the CO
cylinder and screw it into the H

2

cylinder.

7. Press and release POWER/MODE to
start the H

calibration.

2

8. Repeat Step 8 through Step 11.

9. After the H

response is calibrated, the

2

instrument continues to the START
item in the A-CAL menu.

10. If you did not calibrate the H

2

response, use AIR to scroll to the
START item in the A-CAL menu.

11. Remove the calibration cup.

12. Press and release POWER/MODE to enter Measuring Mode.

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Setting the Calibration Values in CAL--P

GAS CAL

A-CAL

A-CAL

50

CO

ppm

CYL A

50

CO

ppm

CAL--P

CAL--P

CO

ppm

1. While in User Mode, press AIR to scroll to GAS CAL.

2. Press and release POWER/MODE. The AIR item appears.

3. Use AIR to scroll to the A-CAL item (E-CAL if E-CAL in User Mode is set to ON).

4. Press and release POWER/MODE. The Auto Cal screen for the gas assigned to Cylinder A displays.

5. Use AIR to scroll to CAL--P.

6. Press and release POWER/MODE. The gas name displays.

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7. Use AIR to scroll to the gas whose calibration gas value you want to change.

ESCAPE

AIR

AIR

AIR

CAL--P

CO

ppm

CAL--P

H2

ppm

CAL--P

50

CO

ppm

8. Press and release POWER/MODE. The calibration value begins to flash.

9. Use AIR to adjust the calibration gas value. The calibration gas value in the instrument must match the value listed on the calibration gas cylinder you are using.

10. Press and release POWER/MODE to save the change. The calibration gas value stops flashing and the unit returns to the gas name screen.

11. Repeat steps Step 7 - Step 10 for the other channel, if necessary.

12. Use AIR to scroll to ESCAPE.

13. Press and release POWER/MODE to return to the CAL--P item in the A-CAL menu.

14. Press AIR to scroll to ESCAPE.

15. Press and release POWER/MODE to return to the A-CAL item in the GAS CAL menu.

16. See “Exiting the GAS CAL Menu” on page 58 to return to User Mode.

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Making Cylinder Selections in CYL SEL

GAS CAL

A-CAL

A-CAL

50

CO

ppm

CYL A

50

CO

ppm

CYL SEL

CYL SEL

CO

ppm

The CYL SEL menu item allows you to assign cylinders for calibration. As shipped from the
factory, CO is assigned to Cylinder A and H2 is assigned to Cylinder B. There are 5 cylinder
assignments available: A, B, C, D, and E.

1. While in User Mode, press AIR to scroll to GAS CAL.

2. Press and release POWER/MODE. The AIR CAL menu item appears.

3. Use AIR to scroll to the A-CAL item (E-CAL if E-CAL in User Mode is set to ON).

4. Press and release POWER/MODE. The Auto Cal screen for the gas assigned to Cylinder A displays.

5. Use AIR to scroll to CYL SEL.

6. Press and release POWER/MODE. CO displays.

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7. Use AIR to scroll to the gas whose cylinder assignment you want to change.

ESCAPE

AIR

AIR

AIR

CYL SEL

CO

ppm

CYL SEL

H2

ppm

CYL SEL

A

CO

ppm

8. Press and release POWER/MODE. The current setting flashes. In the example below, CO is selected.

9. Use AIR to change the cylinder assignment. The choices are A, B, C, D, and E.

10. Press and release POWER/MODE to save the change. The cylinder assignment stops flashing and the unit returns to the gas selection screen.

11. Repeat steps Step 7 - Step 10 for the other channel, if necessary.

12. Use AIR to scroll to ESCAPE.

13. Press and release POWER/MODE. The instrument returns to the CYL SEL menu item in the Auto Cal Menu.

14. Press AIR to scroll to ESCAPE.

15. Press and release POWER/MODE. The instrument returns to the A-CAL menu item in the GAS CAL menu.

16. See “Exiting the GAS CAL Menu” on page 58 to return to User Mode.

Exiting the GAS CAL Menu

1. While in the GAS CAL menu, press AIR to scroll to ESCAPE.

2. Press and release POWER/MODE to return to the GAS CAL item in User Mode.

3. See “Entering Measuring Mode (START)” on page 75 to enter Measuring Mode.

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Setting Calibration Parameters (CAL SET)

CAL SET
CAL .RMDR

CAL .RMDR

The CAL SET menu has 4 items: CAL.RMDR, CAL.INT, CAL.EXPD, and ESCAPE.

1. While in User Mode, press AIR to scroll to CAL SET.

2. Press and release POWER/MODE. The CAL.RMDR item appears.

CAL.RMDR

ON (factory setting): The GasWatch 3 gives an indication at start up if it is due for calibration.
The type of indication depends on the CAL.EXPD setting (see page 60).

OFF: The GasWatch 3 does not give an indication at start up if it is due for calibration.

1. After entering the CAL SET menu, press AIR to scroll to CAL.RMDR.

2. Press and release POWER/MODE. The current setting flashes.

3. Use AIR to display the desired setting.

4. Press and release POWER/MODE to save the setting and return to the CAL.RMDR item in the CAL SET menu.

5. See “Exiting the CAL SET Menu” on page 61 to return to User Mode.

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CAL.INT

CAL .INT

CAL .EXPD

This setting defines the amount of time between calibrations and can be set in 1 day increments.
The minimum setting is 1 day and the maximum setting is 1000 days. The factory setting is 90
days.

1. After entering the CAL SET menu, press AIR to scroll to CAL.INT.

2. Press and release POWER/MODE. The current setting flashes.

3. Use AIR to display the desired setting.

4. Press and release POWER/MODE to save the setting and return to the CAL.INT item in the CAL SET menu.

5. See “Exiting the CAL SET Menu” on page 61 to return to User Mode.

CAL.EXPD

This item defines what indication is given during start up when calibration is due and

CAL.RMDR is set to ON (factory setting).

CONFIRM (factory setting): The GasWatch 3 gives an indication at start up if calibration is past

due. Press and release AIR to continue without calibrating or press and release POWER/MODE
to enter User Mode and perform a calibration.

CANT.USE: The GasWatch 3 gives an indication at start up that calibration is past due. Press and
release POWER/MODE to enter User Mode and perform a calibration. Pressing AIR has no
effect. A successful calibration must be performed in order to use the instrument.

NONE: The GasWatch 3 gives an indication at startup that calibration is past due. It is not
necessary to acknowledge the indication. If desired, press POWER/MODE to enter User Mode
and perform a calibration. The warm-up sequence continues on its own.

1. After entering the CAL SET menu, press AIR to scroll to CAL.EXPD.

2. Press and release POWER/MODE. The current setting flashes.

3. Use AIR to display the desired setting.

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4. Press and release POWER/MODE to save the setting and return to the CAL.EXPD item in

BUMP .SET

SETTING

SETTING

the CAL SET menu.

5. See “Exiting the CAL SET Menu” on page 61 to return to User Mode.

Exiting the CAL SET Menu

1. While in the CAL SET menu, press AIR to scroll to ESCAPE.

2. Press and release POWER/MODE to return to the CAL SET item in User Mode.

3. See “Entering Measuring Mode (START)” on page 75 to enter Measuring Mode.

Setting Bump Test Parameters (BUMP.SET)

The BUMP.SET menu has 5 items: SETTING, BP.RMDR, BP.INT, BP.EXPD, and ESCAPE.

1. While in User Mode, press AIR to scroll to BUMP.SET.

2. Press and release POWER/MODE. The SETTING item appears.

SETTING

The SETTING menu has 5 items: GAS.TIME, CHECK, CAL.TIME, A-CAL, and ESCAPE.

1. After entering the BUMP.SET menu, press AIR to scroll to SETTING.

2. Press and release POWER/MODE. The GAS.TIME item appears.

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GAS.TIME

GAS .TIME

CHECK

The GAS.TIME is the amount of time that the instrument is exposed to gas during a bump test.
The available choices are 30 seconds (factory setting), 45 seconds, 60 seconds, and 90 seconds.

1. After entering the SETTING menu, press AIR to scroll to GAS.TIME.

2. Press and release POWER/MODE. The current setting flashes.

3. Use AIR to display the desired setting.

4. Press and release POWER/MODE to save the setting and return to the GAS TIME item in the SETTING menu.

5. See “Exiting the SETTING Menu” on page 64 to return to BUMP.SET menu.

CHECK

CHECK is the bump test tolerance value and is represented as a percentage of the calibration gas
concentration. It is the percentage that the bump test reading can differ from the auto calibration
value and still be considered a passed bump test. If the bump test reading differs more, the bump
test fails. The available values are 10%, 20%, 30%, 40%, and 50% (factory setting).

1. After entering the SETTING menu, press AIR to scroll to CHECK.

2. Press and release POWER/MODE. The current setting flashes.

3. Use AIR to display the desired setting.

4. Press and release POWER/MODE to save the setting and return to the CHECK item in the SETTING menu.

5. See “Exiting the SETTING Menu” on page 64 to return to BUMP.SET menu.

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CAL.TIME

CAL .TIME

A-CAL

The CAL.TIME is the total time the instrument is exposed to calibration gas if A-CAL is set to
ON and a bump test fails. The bump test time is deducted from the calibration time. For example,

if the CAL.TIME is set to 90 seconds and the GAS.TIME is set to 30 seconds, if the bump test
fails, the GasWatch 3 is only exposed to gas for an additional 60 seconds. The available values are
90 seconds (factory setting), and 120 seconds.

1. After entering the SETTING menu, press AIR to scroll to CAL.TIME.

2. Press and release POWER/MODE. The current setting flashes.

3. Use AIR to display the desired setting.

4. Press and release POWER/MODE to save the setting and return to the CAL.TIME item in the SETTING menu.

5. See “Exiting the SETTING Menu” on page 64 to return to BUMP.SET menu.

A-CAL

ON (factory setting): If a bump test fails, the unit automatically begins a calibration.

OFF: If a bump test fails, the unit does not automatically begin a calibration.

1. After entering the SETTING menu, press AIR to scroll to A-CAL.

2. Press and release POWER/MODE. The current setting flashes.

3. Use AIR to display the desired setting.

4. Press and release POWER/MODE to save the setting and return to the A-CAL item in the SETTING menu.

5. See “Exiting the SETTING Menu” on page 64 to return to BUMP.SET menu.

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Exiting the SETTING Menu

BP .RMDR

BP .INT

1. While in the SETTING menu, press AIR to scroll to ESCAPE.

2. Press and release POWER/MODE to return to the SETTING item in the BUMP.SET menu.

3. See “Exiting the BUMP.SET Menu” on page 65 to return to User Mode.

BP.RMDR

ON: The GasWatch 3 gives an indication at start up if it is due for bump testing. The type of
indication depends on the BP.EXPD setting (see page 65). If the instrument is not due for bump
testing, a check mark appears in the lower left corner of the LCD.

OFF (factory setting): The GasWatch 3 does not give an indication at start up if it is due for bump
testing.

1. After entering the BUMP.SET menu, press AIR to scroll to BP.RMDR.

2. Press and release POWER/MODE. The current setting flashes.

3. Use AIR to display the desired setting.

4. Press and release POWER/MODE to save the setting and return to the BP.RMDR item in the BUMP.SET menu.

5. See “Exiting the BUMP.SET Menu” on page 65 to return to User Mode.

BP.INT

This setting defines the amount of time between bump tests and can be set in 1 day increments.
The minimum setting is 0 days and the maximum setting is 30 days (factory setting).

1. After entering the BUMP.SET menu, press AIR to scroll to BP.INT.

2. Press and release POWER/MODE. The current setting flashes.

3. Use AIR to display the desired setting.

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4. Press and release POWER/MODE to save the setting and return to the BP.INT item in the

BP .EXPD

BUMP.SET menu.

5. See “Exiting the BUMP.SET Menu” on page 65 to return to User Mode.

BP.EXPD

This item defines what indication is given during start up when a bump test is due and BP.RMDR
is set to ON (factory setting is OFF).

CONFIRM (factory setting): The GasWatch 3 gives an indication at start up if a bump test is past
due. Press and release AIR to continue without bump testing or press and release POWER/MODE
to enter User Mode and perform a bump test.

CANT.USE: The GasWatch 3 gives an indication at start up that a bump test is past due. Press
and release POWER/MODE to enter User Mode and perform a bump test. Pressing AIR has no
effect. A successful bump test must be performed in order to use the instrument.

NONE: The GasWatch 3 gives an indication at startup that a bump test is past due. It is not
necessary to acknowledge the indication. If desired, press POWER/MODE to enter User Mode
and perform a bump test. The warm-up sequence continues on its own.

1. After entering the BUMP.SET menu, press AIR to scroll to BP.EXPD.

2. Press and release POWER/MODE. The current setting flashes.

3. Use AIR to display the desired setting.

4. Press and release POWER/MODE to save the setting and return to the BP.EXPD item in the BUMP.SET menu.

5. See “Exiting the BUMP.SET Menu” on page 65 to return to User Mode.

Exiting the BUMP.SET Menu

1. While in the BUMP.SET menu, press AIR to scroll to ESCAPE.

2. Press and release POWER/MODE to return to the BUMP.SET item in User Mode.

3. See “Entering Measuring Mode (START)” on page 75 to enter Measuring Mode.

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Alarm Settings (ALARM--P)

ALARM--P

ALARM--P

CO

ppm

DEF . ALMP

ESCAPE

AIR

AIR

AIR

ALARM--P

CO

ppm

The ALARM--P menu has 3 items: ALARM--P, DEF.ALMP, and ESCAPE.

1. While in User Mode, press AIR to scroll to ALARM--P.

2. Press and release POWER/MODE. The first screen displays.

Setting the Alarm Points

1. After entering the ALARM-P menu, press AIR to scroll to the gas name.

2. Press and release POWER/MODE.

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3. The Warning setpoint flashes.

WARNING

25

CO

ppm

ALARM

50

CO

ppm

ALARM H

1200

CO

ppm

STEL

200

CO

ppm

TWA

25

CO

ppm

ALARM--P

CO

ppm

For all settings:

1) AIR to adjust

2) POWER/MODE

to save and
continue

DEF . ALMP

4. Use AIR to adjust the Warning setpoint. The alarm setpoint limitations are: 20 ppm WARNING ALARM ALARM H 2000 ppm.

5. Press and release POWER/MODE to save the setting.

6. Repeat Step 4 and Step 5 for the Alarm, Alarm H, STEL and TWA settings.

7. The instrument returns to the channel selection screen.

8. See “ESCAPE” on page 68 to return to User Mode.

Defaulting the Alarm Points

Defaulting the alarm points defaults them back to factory settings as outlined in Table 1 on page 8
or to the settings saved in the SAVE-AP item in Gas Select Mode if you performed a SAVE-AP
operation.

1. After entering the ALARM-P menu, press AIR to scroll to DEF.ALMP.

2. Press POWER/MODE to enter the DEF.ALMP item.

3. Press POWER/MODE to perform an alarm default. Press AIR to return to the DEF.ALMP

4. The instrument asks if you’re sure you want to default the alarm points.

item in the ALARM-P menu.

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5. Press POWER/MODE to default the alarm points. Press AIR to return to the DEF.ALMP

LUNCH

item in the ALARM-P menu.

6. See “ESCAPE” on page 68 to return to User Mode.

ESCAPE

1. While in the ALARM-P menu, press AIR to scroll to ESCAPE.

2. Press and release POWER/MODE to return to the ALARM--P item in User Mode.

3. See “Entering Measuring Mode (START)” on page 75 to enter Measuring Mode.

Updating the Lunch Break Setting (LUNCH)

OFF (factory setting): The GasWatch 3 automatically starts new TWA and PEAK reading
collection and resets the time in operation at startup.

ON: The Lunch Break Screen displays during startup. From this screen, you can choose to
continue accumulating TWA and PEAK readings and the time in operation from the last time the
GasWatch 3 was used or start collecting new readings and reset the time in operation.

1. While in User Mode, press AIR to scroll to LUNCH.

2. Press and release POWER/MODE. The current setting flashes.

3. Use AIR to display the desired setting.

4. Press and release POWER/MODE to save the setting and return to the LUNCH item in User Mode.

5. See “Entering Measuring Mode (START)” on page 75 to enter Measuring Mode.

GasWatch 3 for Carbon Monoxide (Hydrogen-Compensated) Chapter 5: User Mode and Calibration • 68

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Setting the Confirmation Beep and

BEEP

BEEP .SEL

Non-Compliance Indicator (BEEP)

The BEEP menu has 3 items: BEEP.SEL, BEEP.INT, and ESCAPE.

1. While in User Mode, press AIR to scroll to BEEP.

2. Press and release POWER/MODE. The BEEP.SEL item appears.

BEEP.SEL

BEEP.SEL defines what kind of confirmation or non-compliance indication you want to occur in
Measuring Mode. The available choices are:

OFF (factory setting): The GasWatch 3 does not provide a confirmation alert or non-compliance
indicator.

LED: The GasWatch 3’s LEDs double flash as often as defined by the BEEP.INT parameter to
verify that the instrument is operating.

BUZZER: The GasWatch 3’s buzzer double beeps as often as defined by the BEEP.INT
parameter to verify that the instrument is operating.

LED+BUZ: The GasWatch 3’s LEDs double flash and the buzzer double beeps as often as
defined by the BEEP.INT parameter to verify that the instrument is operating.

BMP/CAL: If a bump test or a calibration is due and if BP.EXPD or CAL.EXPD is set to
CONFIRM (factory setting) or NONE, the GasWatch 3’s LEDs double flash as often as defined

by the BEEP.INT parameter to indicate a non-compliance. Once a bump test or calibration
(depending on which is due) is done, the LEDs stop flashing.

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1. While in the BEEP menu, press AIR to scroll to BEEP.SEL.

BEEP .SEL

BEEP .INT

2. Press and release POWER/MODE. The current setting flashes.

3. Use AIR to display the desired setting.

4. Press and release POWER/MODE to save the setting and return to the BEEP.SEL item in the BEEP menu.

5. See “ESCAPE” on page 70 to return to User Mode.

BEEP.INT

The BEEP.INT parameter defines how often the confirmation alert or non-compliance indicator
selected in BEEP.SEL occurs. This setting only applies if the BEEP.SEL parameter is set to
something other than OFF (factory setting). The available choices are 0.5 minutes and 1-99
minutes in 1 minute increments. The factory setting is 5 minutes.

1. While in the BEEP menu, press AIR to scroll to BEEP.INT.

2. Press and release POWER/MODE. The current setting flashes.

3. Use AIR to display the desired setting.

4. Press and release POWER/MODE to save the setting and return to the BEEP.INT item in the BEEP menu.

5. See “ESCAPE” on page 70 to return to User Mode.

ESCAPE

1. While in the BEEP menu, press AIR to scroll to ESCAPE.

2. Press and release POWER/MODE to return to the BEEP item in User Mode.

3. See “Entering Measuring Mode (START)” on page 75 to enter Measuring Mode.

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Updating the Backlight Time (BL TIME)

BL TIME

KEY .TONE

This setting defines how long the LCD backlight stays on when you press any button. The
minimum setting is OFF; the maximum setting is 255 seconds. The factory setting is 30 seconds.

1. While in User Mode, press AIR to scroll to BL TIME.

2. Press and release POWER/MODE. The current setting flashes.

3. Use AIR to display the desired setting.

4. Press and release POWER/MODE to save the setting and return to the BL TIME item in User Mode.

5. See “Entering Measuring Mode (START)” on page 75 to enter Measuring Mode.

Turning the Key Tone On/Off (KEY.TONE)

ON (factory setting): The instrument beeps when a button is pressed.

OFF: The instrument does not beep when a button is pressed.

1. While in User Mode, press AIR to scroll to KEY.TONE.

2. Press and release POWER/MODE. The current setting flashes.

3. Use AIR to display the desired setting.

4. Press and release POWER/MODE to save the setting and return to the KEY.TONE item in User Mode.

5. See “Entering Measuring Mode (START)” on page 75 to enter Measuring Mode.

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Display Mode Items (DISP.SET)

DISP .SET

OFF: USER ID, STN ID, and BUZZ.VOL screens do not appear in Display Mode.

ON (factory setting): BUZZ.VOL screen appears in Display Mode. USER ID and STN ID

screens appear in Display Mode if ID DISP in Maintenance Mode is also set to ON (factory
setting is OFF).

1. While in User Mode, press AIR to scroll to DISP.SET.

2. Press and release POWER/MODE. The current setting flashes.

3. Use AIR to display the desired setting.

4. Press and release POWER/MODE to save the setting and return to the DISP.SET item in User Mode.

5. See “Entering Measuring Mode (START)” on page 75 to enter Measuring Mode.

Zero Suppression (ZERO.SUP)

This item only appears if ZSUP.DSP is set to ON in Maintenance Mode (factory setting is OFF).

The ZERO.SUP setting is not intended for field adjustment. The default setting is ON. The
suppression value is 2 ppm.

Zero Follower (ZERO.FLW)

This item only appears if ZFLW.DSP is set to ON in Maintenance Mode (factory setting is OFF).

The ZERO.FLW setting is not intended for field adjustment. The default setting is ON.

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Turning Easy Calibration On/Off (E-CAL)

E--CAL

DATE

10:42

2 .13

2019

OFF (factory setting): Auto Calibration (A-CAL) item appears in GAS CAL menu instead of
Easy Calibration (E-CAL).

XX seconds: Easy Calibration (E-CAL) item appears in GAS CAL menu instead of Auto
Calibration (A-CAL). During a calibration, the instrument counts down from the number of
seconds you select.

1. While in User Mode, press AIR to scroll to E-CAL.

2. Press and release POWER/MODE. The current setting flashes.

3. Use AIR to display the desired setting.

4. Press and release POWER/MODE to save the setting and return to the E-CAL item in User Mode.

5. See “Entering Measuring Mode (START)” on page 75 to enter Measuring Mode.

Setting the Date/Time (DATE)

1. While in User Mode, place the cursor next to DATE.

2. Press and release POWER/MODE. The date and time display with the year flashing.

3. Use AIR to display the desired year.

4. Press and release POWER/MODE to save the setting. The month setting flashes.

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5. Repeat Step 3 and Step 4 to enter the month, day, hours, and minutes settings. The date and

PASS-W

PASS - W

0 4 0 5

time are saved and the instrument returns to the DATE item in User Mode.

6. See “Entering Measuring Mode (START)” on page 75 to enter Measuring Mode.

Turning the Password On/Off (PASS-W)

ON: The GasWatch 3 prompts you for a password when you enter User Mode. The factory-set
password is 0405 but it can be changed.

OFF (factory setting): No password is required to enter User Mode.

1. While in User Mode, press AIR to scroll to PASS-W.

2. Press and release POWER/MODE. The current setting flashes.

3. Use AIR to display the desired setting.

4. If you selected OFF, press and release POWER/MODE to save the setting and return to the
PASS- W item in User Mode.

If you selected ON, continue with Step 5.

5. Press and release POWER/MODE. The Set Password Screen appears. The current password appears and the first digit flashes.

6. Use AIR to display a number from 0 to 9.

7. Press and release POWER/MODE to enter the selection and advance to the next number. To go back a number, press and hold AIR and POWER/MODE for a few seconds.

8. Repeat Step 6 and Step 7 to select the remaining numbers. When you press and release POWER/MODE to enter the last number, the password is saved and the instrument returns to the PASS-W item in User Mode.

9. See “Entering Measuring Mode (START)” on page 75 to enter Measuring Mode.

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Viewing the ROM/SUM (ROM/SUM)

ROM / SUM

ROM / SUM

d671

5822

START

The ROM/SUM screen shows the instrument’s firmware version and firmware checksum.

1. While in User Mode, press AIR to scroll to ROM/SUM.

2. Press and release POWER/MODE. The screen cycles through the main board’s ROM/SUM and the sensor board’s ROM/SUM. The ROM is the top value and the SUM is the bottom value.

3. Press and release POWER/MODE to return to the ROM/SUM item in User Mode.

4. See “Entering Measuring Mode (START)” on page 75 to enter Measuring Mode.

Entering Measuring Mode (START)

1. While in User Mode, press AIR to scroll to START.

2. Press and release POWER/MODE. The instrument begins its warmup sequence.

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Chapter 6: Maintenance

Overview

This chapter describes troubleshooting procedures for the GasWatch 3. It also includes procedures
for replacing the battery and replacing various consumable parts.

WARNING: RKI Instruments recommends that service, calibration, and repair of RKI gas

detectors be performed by personnel properly trained for this work. Replacing the
sensor and other parts with original equipment does not affect the intrinsic safety
of the instrument.

AVERTISSEMENT: RKI Instruments recommande que le service, l'étalonnage et la

réparation des détecteurs de gaz RKI soient effectués par du personnel
dûment formé à ces travaux. Le remplacement du capteur et d'autres
pièces par l'équipement d'origine n'affecte pas la sécurité intrinsèque de
l'instrument.

Troubleshooting

The troubleshooting table describes error messages, symptoms, probable causes, and
recommended action for problems you may encounter with the GasWatch 3.

Symptoms Probable Causes Recommended Action

• The LCD is blank. • The unit got turned off.

• The battery is inserted

• The battery needs to be

• The battery cover may not be

Table 9: Troubleshooting the GasWatch 3

1. To turn on the unit, press and briefly hold POWER/MODE.

backwards.

replaced.

completely closed.

2. Reinstall the battery in the correct orientation.

3. Replace the battery.

4. Be sure the battery cover is completely closed and that the screw is tight.

5. If the difficulties continue, contact RKI Instruments, Inc. for further instruction.

GasWatch 3 for Carbon Monoxide (Hydrogen-Compensated) Chapter 6: Maintenance • 76

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Table 9: Troubleshooting the GasWatch 3

Symptoms Probable Causes Recommended Action

• The LCD shows an
abnormally high
reading but other gas
detection instruments
do not.

• Calibration fails. • The calibration value does

• Heart symbol at the
top of the screen
becomes steadily on
or disappears.

• Charcoal filter needs to be
replaced.

• The GasWatch 3 needs to be
recalibrated.

• The sensor needs
replacement.

not match the cylinder gas
concentration.

• The sample gas is not
reaching the sensor because
of a bad connection.

• The calibration cylinder is
out of gas or is outdated.

• The sensor needs
replacement.

• A microprocessor error has
occurred.

1. Replace the charcoal filter.

2. Recalibrate the unit.

3. If the difficulties continue, replace the sensor and calibrate.

4. If the difficulties continue, contact RKI Instruments, Inc. for further instruction.

1. Make sure the GasWatch 3 has been properly set up for calibration.

2. Check all calibration tubing for leaks or for any bad connections.

3. Verify that the calibration cylinder contains an adequate supply of fresh test sample.

4. If the fail condition continues, replace the sensor.

5. If the difficulties continue, contact RKI Instruments, Inc. for further instruction.

• Contact RKI Instruments, Inc. for

further instruction.

Replacing the Battery

WARNING: To prevent ignition of a hazardous atmosphere, battery must only be changed in

an area known to be nonhazardous.

AVERTISSEMENT: Pour éviter l'inflammation d'une atmosphère dangereuse, la batterie ne

doit être remplacée que dans une zone non dangereuse.

Replace the battery when the battery icon flashes and its lowest battery level indication bar
disappears.

1. Make sure the GasWatch 3 is off.

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2. For alligator clip versions, pry the base clip off so that it swings away from the instrument.

Figure 6: Releasing the Alligator Clip

Base Clip UnlockedBase Clip Locked

Figure 7: Removing the Battery Retainer

3. Use a small Phillips screwdriver to unscrew the battery retainer’s screw.

4. Remove the battery retainer.

5. Remove the old battery.

GasWatch 3 for Carbon Monoxide (Hydrogen-Compensated) Chapter 6: Maintenance • 78

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6. Install the new CR2450 button cell battery and reinstall the battery retainer and screw.

Screw

Battery Retainer
CR2450 Battery

+ Sid e

Figure 8: Installing a New Battery

7. If the instrument has been without batteries for more than 5 minutes, the date and time are
reset and need to be set again. When the new batteries are installed, the instrument
automatically turns on and displays the Date/Time Screen. Set the date and time as described
on page 73. Once the date and time are set, the instrument begins its warmup sequence. If you
do not set the date and time within 30 seconds, the instrument automatically begins its
warmup sequence.

Replacing the Charcoal Filter

1. Verify that the GasWatch 3 is off.

2. Use a small Phillips screwdriver to unscrew the sensor retainer’s screw.

3. Remove the sensor retainer.

4. The white hydrophobic filter and the sensor gasket should stay on the sensor.

5. Remove the white hydrophobic filter.

6. Remove the black charcoal filter from the center of the sensor gasket.

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7. Install the new charcoal filter. It should be seated and recessed in the center of the sensor

Hydrophobic Filter (White)

Sensor Retainer

Screw

Sensor Gasket

Charcoal Filter (Black)

Figure 9: Replacing the Charcoal Filter

gasket.

8. Reinstall the white hydrophobic filter. It should be seated and recessed in the sensor gasket and should not overlap the edge of the sensor gasket.

9. Reinstall the sensor retainer and tighten its screw.

Replacing the Hydrophobic Filter

1. Verify that the GasWatch 3 is off.

2. Use a small Phillips screwdriver to unscrew the sensor retainer’s screw.

3. Remove the sensor retainer.

4. The hydrophobic filter and the sensor gasket should stay on the sensor.

5. Remove the old hydrophobic filter.

GasWatch 3 for Carbon Monoxide (Hydrogen-Compensated) Chapter 6: Maintenance • 80

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6. Install the new hydrophobic filter. It should be seated and recessed in the sensor gasket and

Sensor Retainer

Screw

Sensor Gasket with
Charcoal Filter

Hydrophobic Filter (White)

Figure 10: Replacing the Hydrophobic Filter

should not overlap the edge of the sensor gasket.

7. Reinstall the sensor retainer and tighten its screw.

Replacing the Sensor

1. Verify that the GasWatch 3 is off.

2. Use a small Phillips screwdriver to unscrew the sensor retainer’s screw.

3. Remove the sensor retainer.

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4. Remove the sensor gasket and filters. The filters may fall out. The sensor is exposed.

Figure 11: Replacing the Sensor

Sensor

Charcoal Filter (Black)

Sensor Gasket

Hydrop hobic Fi l t er (Whi te)

Sensor Retainer

Screw

5. Remove the old sensor from its socket.

6. Carefully insert the replacement sensor. Be sure that the new sensor’s orientation slots are aligned correctly. Do not force the sensor into its slot.

7. Reinstall the sensor gasket. Be sure to orient it as shown inFigure 11 above.

8. Reinstall the charcoal filter. It should be seated and recessed in the center of the sensor gasket.

9. Reinstall the hydrophobic filter. It should be seated and recessed in the sensor gasket and should not overlap the edge of the sensor gasket.

10. Reinstall the sensor retainer and tighten its screw.

11. Calibrate the CO and H2 response as described on page 47.

GasWatch 3 for Carbon Monoxide (Hydrogen-Compensated) Chapter 6: Maintenance • 82

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Chapter 7: General Parts List

Table 10: General Parts List

Part Number Description

06-1248RK-03 Calibration kit tubing, 3 foot length

07-0056 Sensor gasket

10-1088 Screw, for sensor retainer and battery retainer

13-0105RK Watch band

13-0126 Alligator clip

13-0204RK Pins for connecting watch band/alligator clip

21-1955 Sensor retainer

21-1956 Battery retainer

33-0175 Hydrophobic filter

33-7100 Charcoal filter disk, 5 pack, for CO sensor

47-5084RK USB/IrDA adapter module, Legasic, for use with all premier portables (without

USB cable)

47-5084RK-01 USB/IrDA adapter assembly, Legasic, for use with all premier portables (with mod-

ule and USB cable)

47-5085RK Cable, USB A to USB mini, 6 feet, for 47-5084RK USB/IrDA adapter module

49-1404RK Battery, CR 2450 coin type

71-0509 Operator’s Manual, GasWatch 3 for CO(-H2) (this document)

71-0514 Operator’s Manual, GasWatch 3 Datalogging Program

71-0515 Operator’s Manual, GasWatch 3 Setup Program

81-0000RK-51 Calibration cylinder, 200 ppm H

81-0064RK-01 Calibration cylinder, 50 ppm CO in air, 34 liter steel

81-0064RK-03 Calibration cylinder, 50 ppm CO in air, 103 liter

81-0076RK-01 Calibration cylinder, zero air, 34 liter steel

81-0076RK-03 Calibration cylinder, zero air, 103 liter

81-1050RK-25 Regulator, fixed flow, 0.25 LPM, with gauge and knob, for 17 liter and 34 liter steel

cylinders (cylinders with external threads)

81-1051RK-25 Regulator, fixed flow, 0.25 LPM, with gauge and knob, for 34 liter aluminum, 58

liter, and 103 liter cylinders (cylinders with internal threads)

in air, 34 liter steel

2

81-1194 Calibration cup

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Table 10: General Parts List (Continued)

Part Number Description

81-GW3COH Calibration kit: 103 liter cylinder of 50 ppm CO in N2, 34 liter steel cylinder of 200

ppm H

, regulator, tubing, calibration cup, case

2

81-GW3COH-LV Calibration kit: 34 liter steel cylinder of 50 ppm CO in N

200 ppm H

regulator, tubing, calibration cup, case

2,

ESR-A1CP-CO-H Hydrogen-compensated carbon monoxide (CO) sensor

, 34 liter steel cylinder of

2

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Appendix A: Maintenance Mode

Overview

This appendix describes the GasWatch 3 in Maintenance Mode. The GasWatch 3 is factory-set to
suit most applications. Update settings in Maintenance Mode only if required for your specific
application. Maintenance Mode items and their factory settings are listed in Table 11 below.

Table 11: Maintenance Mode Menu Items

Maintenance Mode
Menu Item

GAS CAL (page 88) Perform an air adjust, perform a span adjustment, change the calibration values.

Description

AIR Perform a fresh air adjustment.

A-CAL or
E-CAL
depending on
E-CAL User
Mode setting

ESCAPE Return to the GAS CAL item in Maintenance Mode.

Perform a span adjustment and set the calibration gas concentra-

tion.

A-CAL (or
E-CAL)

START Begin the warmup sequence and enter Measuring

CAL-P Set the calibration gas concentration.

CYL SEL Assign a cylinder (A-E) to each gas. CO is assigned

ESCAPE Return to the A-CAL item in the GAS CAL menu.

Perform an automatic span adjustment.

Mode.

to Cylinder A and H
default.

is assigned to Cylinder B by

2

GAS.TEST (page 88) Apply gas to test sensor response and observe alarm indications without an alarm

event being recorded.

SEN.DATE (page 90) View and/or set the replacement date for the sensor and the battery.

BUMP (page 90) Perform a bump test.

LATCH (page 91) ON

D.ZERO (page 91) ON

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(factory setting): The GasWatch 3 remains in alarm until the alarm condition

passes and POWER/MODE is pressed.

OFF

: The GasWatch 3 automatically resets an alarm when the alarm condition

passes.

(factory setting): You can manually perform a fresh air adjust in Measuring

Mode by pressing AIR.

OFF

: You cannot manually perform a fresh air adjust in Measuring Mode by

pressing AIR.

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Table 11: Maintenance Mode Menu Items

Maintenance Mode
Menu Item

A.ZERO (page 92) ON: The GasWatch 3 asks if you want to perform a fresh air adjustment at the end

ID DISP (page 92) ON

ZERO.SUP (page 93) ON

ZERO.FLW (page 93) ON

ZSUP.DSP (page 93) ON

ZFLW.DSP (page 93) ON

Description

of the startup sequence.

OFF

(factory setting): The GasWatch 3 does not ask if you want to perform a fresh

air adjustment at the end of the startup sequence.

: User ID and Station ID screens appear in startup sequence. IDs can be

changed in Display Mode if DISP.SET in User Mode is also set to ON.

OFF

(factory setting): User ID and Station ID screens do not appear in startup

sequence. IDs cannot be changed in Display Mode.

(factory setting): Not intended for field adjustment. The suppression value is 2

ppm.

(factory setting): Not intended for field adjustment.

: Zero suppression item appears in User Mode.

OFF

(factory setting): Zero suppression item does not appear in User Mode.

(Zero suppression item is always available in Maintenance Mode)

: Zero follower item appears in User Mode.

OFF

(factory setting): Zero follower item does not appear in User Mode.

(Zero follower item is always available in Maintenance Mode)

CYL.DISP (page 93) ON

DATE (page 94) Set the current date and time.

PAS S -W ( pa ge 94 ) ON

ROM/SUM (page 95) View the firmware information for the GasWatch 3’s sensor board and main board.

M.DEF (page 96) Set all parameters back to their RKI factory settings.

START (page 97) Press and release POWER/MODE to begin the warmup sequence and enter Mea-

(factory setting): CYL SEL item appears in GAS CAL.

OFF

: CYL SEL item does not appear in GAS CAL.

(RKI Instruments, Inc. does not recommend adjusting this setting.)

(factory setting): Maintenance Mode is password-protected. Factory-set pass-

word is 3000.

OFF

: Maintenance Mode is not password-protected.

suring Mode.

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Entering Maintenance Mode

PASS-W set to OFF PASS-W set to ON

GAS CAL

PASS - W

0 0 0 0

GAS CAL

WARNING: The GasWatch 3 is not in operation as a gas detector while in Maintenance

Mode.

1. Take the GasWatch 3 to a non-hazardous location and turn it off if it is on.

2. Press and hold AIR, then press and hold POWER/MODE. You will hear a beep after one second. Continue to hold the buttons down.

3. When you hear a second beep, release the buttons.

4. The screen that appears depends on the setting of Maintenance Mode’s PA SS -W item.

If PASS-W is set to OFF, continue with Step 8.

If PASS-W is set to ON (factory setting), continue with Step 5.

5. If PAS S- W is set to ON in Maintenance Mode, a password screen appears and the first digit is flashing. The factory-set password is 3000 but it can be changed.

6. Use AIR to select each password number then press POWER/MODE to save it and move on
to the next number. To go back a number, press and hold AIR and POWER/MODE for a few
seconds. To reverse the direction of change (ie. from increasing to decreasing or vice versa):

a. Press and hold AIR.
b. Immediately press POWER/MODE and then release both buttons.

7. Continue to Step 6.

8. The GAS CAL item displays.

9. Use AIR to move through the Maintenance Mode items.

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Tips for Using Maintenance Mode

• To scroll from one item to the next, press and release AIR. To reverse the scrolling direction:
a. Press and hold AIR.
b. Immediately press POWER/MODE and then release both buttons.
c. The scrolling direction returns to the original direction when you exit and reenter a menu.

• To skip an item when a question is asked, press and release AIR.

• To enter an item and to save any changes, press and release POWER/MODE.

• To change a flashing parameter, press and release AIR. To reverse the direction of change (i.e..

from increasing to decreasing or vice versa):

a. Press and hold AIR.
b. Immediately press POWER/MODE and then release both buttons.

• To exit an entered item without saving a change, press and hold AIR and POWER/MODE for a

few seconds.

Performing a Calibration (GAS CAL)

See page 47 for a description of the GAS CAL item.

Performing a Gas Test (GAS.TEST)

The GAS.TEST item allows you to apply gas to the instrument and see all alarm indications
except for the buzzer indication. There is no buzzer indication in the GAS.TEST menu even
though the buzzer sounds in the event of a real gas alarm condition while in Measuring Mode.

A gas test is not saved in logged data.

Preparing for a Gas Test

To perform a gas test on the GasWatch 3, you need:

• A calibration gas cylinder. The concentrations should be above the alarm condition you

want to check. Standard alarm points are listed on page 8.

• A 0.25 LPM fixed flow regulator

• Non-absorbent tubing

• Calibration cup

1. Confirm that the regulator knob is turned all the way clockwise. Screw the 0.25 LPM fixed flow regulator onto the calibration cylinder.

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2. Install the calibration cup onto the GasWatch 3. The calibration cup has an indicated flow

GAS .TEST

GAS .TEST

0

CO

ppm

BUZZ .OFF

0

CO

ppm

direction. Be sure the calibration cup is installed in the correct direction and that it is pushed
on all the way.

3. Use the tubing to connect the regulator to the inlet of the calibration cup.

Performing a Gas Test

1. While in Maintenance Mode, press AIR to scroll to GAS.TEST.

2. Press and release POWER/MODE. The current gas reading displays. The bottom of the LCD alternates between “GAS.TEST” and “BUZZ.OFF”.

3. Turn the regulator knob counterclockwise to open the regulator.

4. The instrument initiates alarm indications except for the buzzer. There is no buzzer indication in the GAS.TEST menu even though the buzzer sounds in the event of a real gas alarm condition.

5. Turn the regulator knob clockwise to close the regulator.

6. Unscrew the regulator from the calibration cylinder.

7. Remove the calibration cup from the GasWatch 3.

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8. Store the calibration kit in a safe and convenient place.

SEN .DATE

CO

1 . 1

2019

BATTERY

1 . 1

2019

ESCAPE

AIR

AIR

AIR

9. Press and release POWER/MODE to return to the GAS.TEST item in Maintenance Mode.

10. See “Entering Measuring Mode (START)” on page 97 to enter Measuring Mode.

Sensor/Battery Replacement Date (SEN.DATE)

The SEN.DATE item allows you to keep track of when the sensor and the battery were replaced.

1. While in Maintenance Mode, press AIR to scroll to SEN.DATE.

2. Press and release POWER/MODE. The sensor replacement date displays.

3. Use AIR to scroll to the item whose replacement date you want to view or change.

4. To change the replacement date:

a. With the desired item displayed, press and release POWER/MODE.
b. Press and release POWER/MODE again to set the replacement date to the current date.

5. Use the AIR button to scroll to ESCAPE.

6. Press and release POWER/MODE to return to the SEN.DATE item in Maintenance Mode.

7. See “Entering Measuring Mode (START)” on page 97 to enter Measuring Mode.

Performing a Bump Test (BUMP)

GasWatch 3 for Carbon Monoxide (Hydrogen-Compensated) Appendix A: Maintenance Mode • 90

See “Performing a Bump Test (BUMP)” on page 42 for a description of the BUMP item.

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Setting Alarms to Latching or Self-Resetting (LATCH)

LATCH

D .ZERO

ON (factory setting): The GasWatch 3 remains in alarm until the alarm condition passes and
POWER/MODE is pressed.

OFF: The GasWatch 3 automatically resets an alarm when the alarm condition passes.

1. While in Maintenance Mode, press AIR to scroll to LATCH.

2. Press and release POWER/MODE. The current setting flashes.

3. Use AIR to display the desired setting.

4. Press and release POWER/MODE to save the setting and return to the LATCH item in Maintenance Mode.

5. See “Entering Measuring Mode (START)” on page 97 to enter Measuring Mode.

Turning the Demand Zero Function On/Off (D.ZERO)

ON (factory setting): You can manually perform a fresh air adjust in Measuring Mode by pressing
AIR.

OFF: You cannot manually perform a fresh air adjust in Measuring Mode.

1. While in Maintenance Mode, press AIR to scroll to D.ZERO.

2. Press and release POWER/MODE. The current setting flashes.

3. Use AIR to display the desired setting.

4. Press and release POWER/MODE to save the setting and return to the D.ZERO item in Maintenance Mode.

5. See “Entering Measuring Mode (START)” on page 97 to enter Measuring Mode.

91 • Appendix A: Maintenance Mode GasWatch 3 for Carbon Monoxide (Hydrogen-Compensated)

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Turning the Auto Zero Function On/Off (A.ZERO)

A .ZERO

ID DISP

ON: The GasWatch 3 asks if you want to perform a fresh air adjustment at the end of the startup
sequence.

OFF (factory setting): The GasWatch 3 does not ask if you want to perform a fresh air adjustment
at the end of the startup sequence.

1. While in Maintenance Mode, press AIR to scroll to A.ZERO.

2. Press and release POWER/MODE. The current setting flashes.

3. Use AIR to display the desired setting.

4. Press and release POWER/MODE to save the setting and return to the A.ZERO item in Maintenance Mode.

5. See “Entering Measuring Mode (START)” on page 97 to enter Measuring Mode.

Turning the ID Display Function On/Off (ID DISP)

ON: The User ID and Station ID screens appear in the startup sequence. If DISP.SET in User
Mode is also set to ON, then the IDs can be changed in Display Mode.

OFF (factory setting): The User ID and Station ID screens do not appear in the startup sequence
and the IDs cannot be changed in Display Mode.

1. While in Maintenance Mode, press AIR to scroll to ID DISP.

2. Press and release POWER/MODE. The current setting flashes.

3. Use AIR to display the desired setting.

4. Press and release POWER/MODE to save the setting and return to the ID DISP item in Maintenance Mode.

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5. See “Entering Measuring Mode (START)” on page 97 to enter Measuring Mode.

Turning the Zero Suppression On/Off (ZERO.SUP)

The ZERO.SUP setting is not intended for field adjustment. The default setting is ON. The
suppression value is 2 ppm.

Turning the Zero Follower On/Off (ZERO.FLW)

The ZERO.FLW setting is not intended for field adjustment. The default setting is ON.

User Mode Zero Suppression (ZSUP.DSP)

ON: Zero suppression item appears in User Mode.

OFF (factory setting): Zero suppression item does not appear in User Mode. The zero suppression

item is always available in Maintenance Mode.

It is not normally necessary to have the zero suppression item appear in User Mode. Contact RKI
Instruments before turning this setting on.

User Mode Zero Follower (ZFLW.DSP)

ON: Zero follower item appears in User Mode.

OFF (factory setting): Zero follower item does not appear in User Mode. The zero follower item

is always available in Maintenance Mode.

It is not normally necessary to have the zero follower item appear in User Mode. Contact RKI
Instruments before turning this setting on.

Cylinder Setting (CYL.DISP)

ON (factory setting): CYL SEL item appears in User and Maintenance Modes’ GAS CAL item.

OFF: CYL SEL item does not appear in User and Maintenance Modes’ GAS CAL item.

93 • Appendix A: Maintenance Mode GasWatch 3 for Carbon Monoxide (Hydrogen-Compensated)

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Setting the Date/Time (DATE)

DATE

10:42

2 . 13

2019

PASS-W

1. From the main menu, place the cursor next to DATE.

2. Press and release POWER/MODE. The date and time display with the year flashing.

3. Use AIR to display the desired year.

4. Press and release POWER/MODE to save the setting. The month setting flashes.

5. Repeat Step 3 and Step 4 to enter the month, day, hours, and minutes settings. The date and time are saved and the instrument returns to the DATE item in Maintenance Mode.

6. See “Entering Measuring Mode (START)” on page 97 to enter Measuring Mode.

Turning the Password On/Off (PASS-W)

ON (factory setting): The GasWatch 3 prompts you for a password when you enter Maintenance
Mode. The factory-set password is 3000 but it can be changed.

OFF: No password is required to enter Maintenance Mode.

1. While in Maintenance Mode, press AIR to scroll to PASS -W.

2. Press and release POWER/MODE. The current setting flashes.

3. Use AIR to display the desired setting.

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4. If you selected OFF, press and release POWER/MODE to save the setting and return to the

PASS-W

3 0 0 0

ROM / SUM

ROM / SUM

d671

5822

PASS- W item in User Mode.

If you selected ON, continue with Step 5.

5. Press and release POWER/MODE. The Set Password Screen appears. The current password displays and the first digit flashes.

6. Use AIR to display a number from 0 to 9.

7. Press and release POWER/MODE to enter the selection and advance to the next number. To go back a number, press and hold AIR and POWER/MODE for a few seconds.

8. Repeat Step 6 and Step 7 to select the remaining numbers. When you press and release POWER/MODE to enter the last number, the password is saved and the instrument returns to the PASSWORD item in Maintenance Mode.

9. See “Entering Measuring Mode (START)” on page 97 to enter Measuring Mode.

Viewing the ROM/SUM (ROM/SUM)

The ROM/SUM screen shows the instrument’s firmware version and firmware checksum.

1. While in Maintenance Mode, press AIR to scroll to ROM/SUM.

2. Press and release POWER/MODE. The screen cycles through the main board’s ROM/SUM and the sensor board’s ROM/SUM. The ROM is the top value and the SUM is the bottom value.

95 • Appendix A: Maintenance Mode GasWatch 3 for Carbon Monoxide (Hydrogen-Compensated)

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3. Press and release POWER/MODE to return to the ROM/SUM item in Maintenance Mode.

M .DEF

M .DEF

YES .MODE

NO .AIR

SURE?

YES .MODE

NO .AIR

4. See “Entering Measuring Mode (START)” on page 97 to enter Measuring Mode.

Performing a Default (M.DEF)

Performing a default operation in Maintenance Mode returns all parameters to their RKI factory
settings.

1. While in Maintenance Mode, press AIR to scroll to M.DEF.

2. Press and release POWER/MODE.

3. Press and release POWER/MODE to perform a default operation. The instrument asks if you are sure you want to perform a default operation.

4. Press and release POWER/MODE to perform a default operation. The instrument beeps twice and returns to the M.DEF item in Maintenance Mode.

5. See “Entering Measuring Mode (START)” on page 97 to enter Measuring Mode.

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Entering Measuring Mode (START)

START

1. While in Maintenance Mode, press AIR to scroll to START.

2. Press and release POWER/MODE. The instrument begins its warmup sequence.

97 • Appendix A: Maintenance Mode GasWatch 3 for Carbon Monoxide (Hydrogen-Compensated)

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Appendix B: Gas Select Mode

Overview

This appendix describes the GasWatch 3 in Gas Select Mode. The GasWatch 3 is factory-set to
suit most applications. Update settings in Gas Select Mode only if required for your specific
application. A description of the Gas Select Mode items is shown in Table 12 below.

Table 12: Gas Select Mode Menu Items

Menu Item (Page # of
Description)

SAVE-AP (page 100) Set the current alarm points as the default alarm points.

MAX SPAN (page 101) ON

STEALTH (page 101) STEALTH ON

START (page 102) Enter Measuring Mode

Description

: Maximum span screen appears after a successful calibration.

OFF

(factory setting): No maximum span screen appears.

: No backlight, LED, or buzzer operation.

STEALTH OFF

normally.

This setting has no effect unless STEALTH is set to ON.

VIB ON
VIB OFF

: Vibrator activates for alarm conditions.

(factory setting): Vibrator does not activate in any situation.

(factory setting): Backlight, LED, and buzzer operate

Entering Gas Select Mode

WARNING: The GasWatch 3 is not in operation as a gas detector while in Gas Select Mode.

1. Take the GasWatch 3 to a non-hazardous location and turn it off if it is on.

2. Press and hold AIR, then press and hold POWER/MODE. You will hear a beep after one second. Continue to hold the buttons down.

3. You will hear a second beep. Continue to hold the buttons down.

4. When you hear a third beep, release the buttons.

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5. A password screen appears and the first digit flashes. The password is 2014.

PASS-W

0 0 0 0

SAVE-AP

6. Use AIR to select each password number then press POWER/MODE to save it and move on to the next number. To go back a number, press and hold AIR and POWER/MODE for a few seconds.

7. The SAVE-AP item displays.

8. Use AIR to move through the Gas Select Mode items.

Tips for Using Gas Select Mode

• To scroll from one item to the next, press and release AIR. To reverse the scrolling direction:
a. Press and hold AIR.
b. Immediately press POWER/MODE and then release both buttons.
c. The scrolling direction returns to the original direction when you exit and reenter a menu.

• To skip an item when a question is asked, press and release AIR.

• To enter an item and to save any changes, press and release POWER/MODE.

• To change a flashing parameter, press and release AIR. To reverse the direction of change (i.e.

from increasing to decreasing or vice versa):

a. Press and hold AIR.
b. Immediately press POWER/MODE and then release both buttons.

• To exit an entered item without saving a change, press and hold AIR and POWER/MODE for a

few seconds.

99 • Appendix B: Gas Select Mode GasWatch 3 for Carbon Monoxide (Hydrogen-Compensated)

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Saving the Alarm Points (SAVE-AP)

SAVE-AP

SAVE-AP

SEL

YES .MODE

SEL

NO .AIR

SEL

Performing a SAVE-AP operation saves the current alarm setpoints.

Performing a DEF.ALMP operation in the ALARM-P User Mode menu sets the instrument’s
alarm points to those saved during the SAVE-AP operation (if performed).

Performing a SAVE-AP has no effect on an M.DEF in Maintenance Mode. An M.DEF operation
returns all instrument settings to the RKI default regardless of if a SAVE-AP operation was
performed.

1. While in Gas Select Mode, press AIR to scroll to SAVE-AP.

2. Press and release POWER/MODE. The display cycles through the following screens.

3. Press and release POWER/MODE to save the current alarm point settings as the default.

4. The instrument returns to the SAVE-AP item in Gas Select Mode.

5. See “Exiting Gas Select Mode (START)” on page 102 to enter Measuring Mode.

GasWatch 3 for Carbon Monoxide (Hydrogen-Compensated) Appendix B: Gas Select Mode • 100

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