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72-RA-C-50
User manual
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RKI Instruments 72-RA-C-50, 72-RC-C, 72-RA-C-58, 72-RB-C, 72-RA-C-59 User manual

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Page 1
GX-3R
Operator’s Manual
Part Number: 71-0477
Revision: P15
Released: 9/16/21
www.GlobalTestSupply.com
Page 2
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 da y’s use with a known concentration of each 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 GX-3R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
About this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Chapter 2: Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Instrument Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
LCD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Control Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Alarm LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Buzzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Vibrator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Infrared Communications Port. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Charging Socket and Battery Pack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Included Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Alligator Clip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Rubber Boot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Wrist Strap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Single-Unit AC Charger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Calibration Cup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Other Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
12 VDC Charger. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Multi-Unit AC Charger. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Belt Clip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
SDM-3R. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
RP-3R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Aspirator Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
IrDA Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Chapter 3: Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Turning On the GX-3R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Performing a Demand Zero . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Turning Off the GX-3R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Measuring Mode Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Monitoring an Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Combustible Gas Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Oxygen-Enriched Atmospheres. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
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H2-Compensated CO Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Interference Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Aspirator Adapter Sampling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Alarm Indications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Responding to Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Data Logging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Chapter 4: Display Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Tips for Using Display Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Peak Screen (PEAK). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
STEL Screen (STEL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
TWA Screen (TWA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Combustible Sensor Target Gas Conversion (LIST) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Changing the User ID (USER ID) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Changing the Station ID (STN ID) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Last Successful Calibration Date (CAL DATA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Last Successful Bump Test Date (BUMP DATA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Date, Time, and Temperature Screen (TEMP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Viewing Alarm Settings Screen (ALARM--PT). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Chapter 5: User Mode and Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Entering User Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Tips for Using User Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Performing a Bump Test (BUMP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Performing a Calibration (GAS CAL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Setting Calibration Parameters (CAL SET) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Setting Bump Test Parameters (BUMP SET) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Alarm Settings (ALARM--PT). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Updating the Lunch Break Setting (LUNCH) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Setting the Confirmation Beep and Non-Compliance Indicator (BEEP) . . . . . . . . . . . . . 73
Updating the Backlight Time (BL TIME). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Turning the Key Tone On/Off (KEY TONE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Display Mode Items (DISP SET) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Zero Suppression (ZERO SUP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Zero Follower (ZERO.FLWR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Setting the Date/Time (DATE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Turning the Password On/Off (PASSWORD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Viewing the ROM/SUM (ROM/SUM). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Entering Measuring Mode (START) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Chapter 6: Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Instrument Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Recharging the Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
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Replacing the Buzzer Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Replacing the Sensor Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Replacing the Hydrophobic Dust Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Replacing a Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Replacing the Battery Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Chapter 7: Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Chapter 8: General Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Appendix A: Maintenance Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Entering Maintenance Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Tips for Using Maintenance Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Performing a Calibration (GAS CAL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Performing a Gas Test (GAS TEST). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Sensor/Battery Replacement Date (SEN DATE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Performing a Bump Test (BUMP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Setting Alarms to Latching or Self-Resetting (LATCHING) . . . . . . . . . . . . . . . . . . . . . 101
Turning the Demand Zero Function On/Off (DEM ZERO). . . . . . . . . . . . . . . . . . . . . . 101
Turning the Auto Zero Function On/Off (AUTOZERO) . . . . . . . . . . . . . . . . . . . . . . . . 102
Turning the ID Display Function On/Off (ID DISP) . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Turning the Zero Suppression On/Off (ZERO SUP) . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Turning the Zero Follower On/Off (ZERO.FLWR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
User Mode Zero Suppression (ZSUP.DISP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
User Mode Zero Follower (ZFLW.DISP). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Setting the Date/Time (DATE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Turning the Password On/Off (PASSWORD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Viewing the ROM/SUM (ROM/SUM). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Performing a Default (M.DEFAULT). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Entering Measuring Mode (START) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Appendix B: Gas Select Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Entering Gas Select Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
Tips for Using Gas Select Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
Changing the Gas Combination (GAS COMB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Saving the Alarm Points (SAVE-AP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Turning Calibration Max Span On/Off (MAX SPAN). . . . . . . . . . . . . . . . . . . . . . . . . . 112
Stealth and Vibrator Settings (STEALTH) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
LEL Definition (CHG LEL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Exiting Gas Select Mode (START). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Appendix C: Interference Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
ESR-A13i-H2S, H2S Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
ESR-A13P-CO, CO Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
ESR-A1CP-COH, H
ESR-A1DP-COHS, CO Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
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-Compensated CO Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
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ESR-A1DP-COHS, H2S Detection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
WARNING: Understand manual before operating. 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.
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Chapter 1: Introduction

Overview

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

About the GX-3R

Using an advanced detection system consisting of up to three gas sensors, the GX-3R personal four-gas monitor detects the presence of combustible gas, oxygen (O2), carbon monoxide
(CO), and hydrogen sulfide (H 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 GX-3R offers a full range of features, including:
• Simultaneous monitoring of one to four gases
• 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 readings
• Built-in time function
• Lunch break feature
• CSA “C/US” classified as intrinsically safe (see Table 2 on page 8)
S) simultaneously. The GX-3R’s compact size and easy-to-use
2
WARNING: The Model GX-3R detects oxygen deficiency, elevated levels of oxygen,
combustible gases, carbon monoxide, and hydrogen sulfide, all of which can be dangerous or life threatening. When using the GX-3R, 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 GX-3R as described in this manual.
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Specifications

Table 1: Standard Sensor Specifications/Alarm Points
Combustible Gas,
Methane (CH
)
4
Oxygen (O
) Hydrogen
2
Sulfide (H
Carbon
S)
2
Monoxide (CO)
Calibration Standard*
Detection Range 0 - 100% LEL 0 - 25% volume 0 - 100.0 ppm 0 - 500 ppm
Service Range n/a 25.1 - 40% volume 100.1 - 200.0 ppm 501 - 2,000 ppm
Reading Increment 1% LEL 0.1% volume 0.1 ppm 1 ppm
Warning
Setpoint
Alarm
Setpoint
Alarm H
Setpoint
10% LEL 19.5% volume,
decreasing
25% LEL 18.0% volume,
decreasing
50% LEL 23.5% volume,
increasing
5.0 ppm 25 ppm
30.0 ppm 50 ppm
100.0 ppm 1200 ppm
STEL Setpoint n/a n/a 5.0 ppm 200 ppm
TWA Setpoint n/a n/a 1.0 ppm 25 ppm
* The GX-3R is also available set up for general hydrocarbons and calibrated to a combustible gas other than methane, such as
isobutane. Consult RKI Instruments, Inc. for further information.
Table 2: GX-3R Specifications
Sampling
Diffusion
Method
Response Time T90 within 30 seconds
Display Graphics LCD Display
Environmental
Conditions
• 3000 meter maximum altitude
• Operating pressure: 70 - 120 kPa (70 - 110 kPa for explosion proof)
• Pollution degree 2
•IP 66/68
Operating
Temperature &
Continuous environment: -20°C to 50 Temporary environment (up to 15 minutes): -40°C to 60
°
C/Below 90% RH
Humidity
Indication
Accuracy for
Detection
Range
Combustible Gas, Catalytic Type Sensor
• Continuous environment (-20°C to 50
• Temporary environment (-40°C to -21°C and 51°C to 60°C): ± 10% LEL
°
C): ± 5% of reading or ± 2% LEL (whichever is greater)
Oxygen
± 0.5% O
2
Hydrogen Sulfide
± 5% of reading or ± 2 ppm H
S (whichever is greater)
2
Carbon Monoxide
± 5% of reading or ± 5 ppm CO (whichever is greater)
°
C/Below 95% RH
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Table 2: GX-3R Specifications
Indication
Accuracy for
Service
Range
Safety/
Regulatory
Power Supply Lithium ion battery pack (3.7 VDC, 200 mA)
Continuous
Operating
Hours
@ 25 °C
Oxygen
± 3.0% O
Hydrogen Sulfide and Carbon Monoxide
± 20% of reading
• ATEX: Certificate Number: DEKRA 17ATEX0103 X
• IECEx: Certificate Number: IECEx DEK 17.0050X
• CSA classified, “C/US”, as Intrinsically Safe. Class I Division 1 Groups A, B, C, D T4.
With combustible gas sensor Without combustible gas sensor
2
II1G Ex da ia IIC T4 Ga/IM1 Ex da ia I Ma (with NCR-6309) II1G Ex ia IIC T4 Ga/IM1 Ex ia I Ma (without NCR-6309)
Ex da ia IIC T4 Ga/Ex da ia I Ma (with NCR-6309) Ex ia IIC T4 Ga/Ex ia I Ma (without NCR-6309)
Class I, Zones 0, A/Ex da ia IIC T4 Ga (with NCR-6309) Class I, Zones 0, A/Ex ia IIC T4 Ga (without NCR-6309)
: 25 hours in Measuring Mode (non-alarm operation)
: 60 hours in Measuring Mode (non-alarm operation)
C US
186718
Battery
Charger Ratings
Case High-impact Plastic, RF Shielded, Dust and Weather Proof (IP66/68)
Included
Accessories
Other
Accessories
Dimensions and
Wei gh t
Input: 100 - 240 VAC, 47 - 63 Hz, 2.4 A Output: 5.99 VDC, 2A max
• Alligator clip
• Rubber boot
• Wrist strap
• Calibration cup
• Single-unit charger
• 12 VDC adapter
• Multi-unit charger
• Belt clip
•SDM-3R
•RP-3R
• Aspirator adapter
• IrDA/USB Cable for connecting to a computer when using the Data Logger Management Program (not needed if computer has an infrared port)
Approximately 65(H) x 58(W) x 26(D) mm (2.6”H x 2.3”W x 1.0”D)
Approximately 100 g (3.5 oz.)
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About this Manual

The GX-3R Operator’s Manual uses the following conventions for notes, cautions, and warnings.
NOTE: Describes additional or critical information.
CAUTION: Describes potential damage to equipment.
WARNING: Describes potential danger that can result in injury or death.
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Chapter 2: Description

GX-3R
POWER
MODE
CO/H2SLELO2
AIR
Bottom Cover
Charging Socket
Sensor
Retainer
Buzzer
Opening
Front Back
LCD
LEDs
Threaded
Inserts
Figure 1: Component Location

Overview

This chapter describes the GX-3R instrument and its accessories.

Instrument Description

Case

The GX-3R’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 on the front of the case allows for LCD viewing. The black bottom cover, located on the bottom of the case, allows access to the filters and sensors. A sensor retainer and filter gasket help orient and retain the sensor and filters.
Three threaded inserts on the back of the case allow for installation of an alligator clip or belt clip.
LCD
The digital LCD (liquid crystal display) simultaneously shows the gas reading for all installed sensors. The LCD also shows information for each of the GX-3R’s operating modes.
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Control Buttons

Two control buttons, AIR and POWER MODE, are located below the LCD.
Table 3: GX-3R Control Button Functions
Button Function(s)
AIR • turns on LCD backlight
• resets alarm condition if LATCHING is set to ON in Maintenance Mode
• enters User Mode, Maintenance Mode, and Gas Select Mode when used with POWER MODE button
• activates the demand zero function (adjusts the GX-3R’s fresh air reading)
• changes the value of a parameter available for adjustment
• scrolls through parameter options
POWER MODE • turns the GX-3R on and off
• turns on LCD backlight
• enters and scrolls through Display Mode
• enters instructions into the GX-3R’s microprocessor
• resets alarm condition if LATCHING is set to ON in Maintenance Mode
• enters User Mode, Maintenance Mode, and Gas Select Mode when used with AIR button

Alarm LEDs

The six alarm LEDs around the edge of the case 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, low battery voltage, and as an indicator during use of the GX-3R’s many display and adjustment options.

Vibrator

A vibrating motor inside the GX-3R case vibrates for gas alarms, unit malfunctions, and as an indicator during normal use of the various modes of the GX-3R.
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 “Stealth and Vibrator Settings (STEALTH)” on page 113.

Sensors

The GX-3R uses three sensors to monitor combustible gas, oxygen (O2), carbon monoxide (CO), and hydrogen sulfide (H and are held in their sockets by the sensor retainer and bottom cover. The sensors use different
detection principles, as described below.
Combustible Gas Sensor
The combustible gas sensor detects combustible gas in the % LEL range using 2 catalytic elements: a standard element and a poison-resistant element that is resistant to sensor poisons like silicone. The element’s resistance changes based on the reaction of gas with oxygen. The change in resistance affects the current flowing through the element. The GX-3R’s circuitry amplifies the current, converts the current to a gas concentration, and displays the
S) simultaneously. The sensors are located inside the GX-3R
2
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concentration on the LCD. The standard calibration for the combustible gas sensor is to methane but the sensor will still
detect and respond to a variety of combustible gases.
/CO/H2S Sensors
O
2
The O
, CO, and H2S sensors are electrochemical cells that consist of two precious metal
2
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 GX-3R’s circuitry amplifies the current, converts the current to a gas concentration, and displays the concentration on the LCD.
There are 4 different types of CO and H
S sensors available:
2
• CO only (ESR-A13P-CO): A single electrochemical cell that detects CO. Instruments with this sensor cannot detect H
•H
compensated CO (ESR-A1CP-CO-H): A single electrochemical cell that detects CO.
2
S.
2
This sensor does not respond to or responds minimally to hydrogen (displays H2 RICH once H
•H
concentration reaches 2000 ppm). Instruments with this sensor cannot detect H2S.
2
S only (ESR-A13i-H2S): A single electrochemical cell that detects H2S. Instruments
2
with this sensor cannot detect CO.
•CO/H
S (ESR-A1DR-COHS): A combination electrochemical cell that detects both CO
2
and H2S.
Dummy Sensors
A dummy sensor is installed in any units that have less than 3 sensors. Dummy sensors are factory installed. The flat side of the dummy sensor faces away from the GX-3R and the hollow side faces toward the GX-3R.

Filters

Combustible Gas Sensor H2S Removal Filter Disk (Dark Red)
An H sensor. The filter disk prolongs the life of the combustible gas sensor by preventing H2S in the ambient air from reaching the sensor. The H may darken over time, its color is not indicative of remaining filter life.
The H means the filter needs replacing after 80 minutes of exposure to 25 ppm H 40 2-minute calibrations with a cylinder containing 25 ppm H2S. If H2S exists in the monitoring environment, the H2S filter disk will have to be replaced more frequently.
CO/H
A dual filter is placed into a recess in the filter gasket over the dual CO/H2S sensor. The black half is a charcoal filter for the CO sensor. The white half is a humidity filter for the H sensor.
Replace the filter if you notice:
S removal filter disk is placed into a recess in the filter gasket over the combustible gas
2
S filter disk is dark red in color and although it
2
S filter disk needs replacing once it’s been exposed to 33 ppm hours of H2S. This
2
S which equates to
2
S Sensor Dual Filter (Black and White)
2
S
2
• Unexplained CO readings.
• For users with a 1 ppm H
unexplained H
S readings, the filter appears dirty, or every 6 months (whichever is
2
S alarm setpoint: A drift on the H2S zero reading,
2
sooner).
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CO Sensor 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 H
S,
2
change the charcoal filter.
H
S Sensor Humidity Filter (White)
2
A white humidity filter covers the H environment to prevent unstable readings around 0 ppm H
S sensor. The filter absorbs humidity in the sampling
2
S. For users with a 1 ppm H2S
2
alarm setpoint, the filter should be replaced every 6 months, if you notice a drift on the zero reading, or if the filter appears dirty (whichever is sooner). For users with a 2 ppm or higher H
S setpoint, the filter does not necessarily need to be replaced.
2
Hydrophobic Dust Filter
The oval-shaped hydrophobic dust filter is attached to the top of the filter gasket, covering the sensor ports and the filters. The filter gasket and hydrophobic dust filter get replaced as a set.
NOTE: Some GX-3Rs have a hydrophobic dust filter that is not attached to the filter gasket.
When replacing the hydrophobic dust filter on one of these GX-3Rs, remove the filter and
the gasket and replace it with a filter gasket/hydrophobic dust filter
assembly.

Infrared Communications Port

An infrared (IR) communications port is located on the top of the case, near the top 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 GX-3R Data Logger Management Program. See the GX-3R Data Logger Management Program operator’s manual for data logging and downloading instructions.

Charging Socket and Battery Pack

A charging socket on the back of the instrument allows for charging cable connection. A lithium ion (Li-ion) battery pack powers the GX-3R. At 25°C the battery lasts at least 25
hours. The battery icon in the upper right of the LCD shows remaining battery life. A low battery warning activates when the GX-3R detects a low battery voltage. The GX-3R
sounds a dead battery alarm when battery voltage is too low for Measuring Mode. The battery pack can be recharged by using the GX-3R charging cable. The battery pack is not
user-replaceable.
NOTE: Use of batteries or battery chargers not specified by RKI Instruments, Inc. will
compromise the CSA classification and may void the warranty. See “Recharging the Batteries” on page 81.
WARNING: To prevent ignition of a hazardous atmosphere, batteries must only be
changed or charged in an area known to be nonhazardous.
AVERTISSEMENT:Pour éviter l’inflammation d’une atmosphère dangereuse, les batteries
doivent uniquement être modifiés ou facturés dans une zone connue comme non dangereuse.
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Included Accessories

Alligator Cli p

Figure 2: Alligator Clip
Figure 3: Charging Cable
AC Adapter
Charging Plug
Alligator Clip
An alligator clip is installed on the back of the GX-3R. The alligator clip can be used to attach the GX-3R to clothing or a belt. Teeth in the alligator clip’s jaws prevent the unit from slipping off.

Rubber Boot

A black rubber boot is installed on the GX-3R.

Wrist Strap

A wrist strap is included with the GX-3R and can be attached to the wrist strap installation feature on the left side of the GX-3R’s case.

Single-Unit AC Charger

The charging cable is a 4 foot cable with an AC adapter on one end and a charging plug that connects to the GX-3R on the other end.
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Calibration Cup

Figure 4: Calibration Cup
FRONT

Belt Clip

Figure 5: Belt Clip
Use the calibration cup to apply gas during a bump test, calibration, or gas test. The calibration cup has an installation orientation to observe. “Front” and “rear” imprinting on the bottom of the cup correspond to the front and rear of the GX-3R when the calibration cup is installed. In addition, a “front” label on the front of the calibration cup should be visible when viewing the LCD with the calibration cup installed.

Other Accessories

12 VDC Charger

The 12 VDC charger is a 4 foot cable with a vehicle plug on one end and plug that connects to the GX-3R’s power jack on the other end.

Multi-Unit AC Charger

The multi-unit charger is a 4 foot wall plug style adapter that plugs into a bar. The bar has five 2-foot cables coming out one side. The end of each of the five cables has a plug that connects to the GX-3R’s power jack. The AC adapter is rated 100 - 240 VAC input, 5.99 VDC output.
Belt Clip
A belt clip makes it easy to hook the GX-3R to a utility belt.

SDM-3R

The SDM-3R is a calibration station for the GX-3R and GX-3R Pro. The station’s buttons can be used for operations (Standalone Mode) or a computer can be used to control the docking station (PC Controlled Mode). See the appropriate SDM-3R manual for more information.
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RP-3R

The RP-3R is a pump that draws sample to the GX-3R. See the RP-3R manual for more information.

Aspirator Adapter

The aspirator adapter is a squeeze-bulb assembly that draws sample to the GX-3R.

IrDA Cable

Unless your computer has a built-in IrDA port, an IrDA cable is needed to establish communication between the GX-3R and the Datalogging Program or the User Setup Program.
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Chapter 3: Operation

RESUME
7:49
SEC
5

Overview

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

Start Up

This section explains how to start up the GX-3R, get it ready for operation, and turn it off.
NOTE: The screens illustrated in this section are for a standard 4-gas unit. The screens
displayed by your GX-3R may be slightly different.

Turning On the GX-3R

To illustrate certain functions, the following description of the GX-3R start up sequence assumes that the following menu items in User Mode are turned on: LUNCH, CAL RMDR, and BUMP.RMDR in User Mode, and ID DISP and AUTOZERO in Maintenance Mode. If any of these items are turned off, then the corresponding screens will not appear.
1 . Press and briefly hold down POWER MODE. Confirm that the LCD turns on, the LEDs
flash, the buzzer sounds, and the motor vibrates before continuing with operation. Release the POWER MODE button when you hear a beep.
2 . If LUNCH is set to ON (factory setting if OFF, see “Updating the Lunch Break Setting
(LUNCH)” on page 72), the Lunch Break Screen appears. The unit counts down from 5 seconds.
a. Continue Accumulating
(TWA) readings from the last time the GX-3R 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 GX-3R 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.
: To continue accumulating peak and time-weighted average
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3 . If CAL RMDR is set to ON (factory setting) and a calibration is due, the screen that
CAL--LMT
7:49
CAL
CAL--LMT
7:49
FAIL
NEXT CAL
7:49
0 d
appears next depends on how CAL EXPD is set in User Mode (see “CAL EXPD” on page 65). The three possible screens are described below. If a calibration is not due, the instrument shows how many days are left until a calibration is due.
CAL EXPD set to
CONFIRM (factory setting)
LCD
Sound Buzzer sounds double pulsing tone Buzzer sounds double pulsing
tone
Action • Option A, Perform calibration
Press and release POWER MODE to perform a calibration. The instrument takes you straight to the AUTO CAL CYL A screen in User Mode’s GAS CAL\AUTO CAL item. See “Performing a Calibration (GAS CAL)” on page 54 for calibration instructions.
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 continue without performing a calibration, press and release AIR.
: To
The GX-3R cannot be used until a
:
successful calibration is per-
formed. Press and release
POWER MODE to perform a cali-
bration. The instrument takes you straight to the AUTO CAL CYL A screen in User Mode’s GAS CAL\AUTO CAL item. If you don’t press POWER MODE, the instrument automatically goes to the AUTO CAL CYL A screen after 6 seconds. See “Performing a Calibration (GAS CAL)” on
page 54 for calibration instruc-
tions.
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.
CAL EXPD set to
CANT USE
CAL EXPD set to
NONE
None
• Option A, Perform calibration To perform a calibration, press and release POWER MODE. The instrument takes you straight to the AUTO CAL CYL A screen in User Mode’s GAS CAL\AUTO CAL item.
• Option B, Bypass message continue without performing a calibration, wait a few seconds for the instrument to continue with its startup sequence.
: To
:
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4 . If BUMP.RMDR is set to ON (factory setting is OFF) and a bump test is due, the screen
BUMP--LMT
7:49
CAL
BUMP--LMT
7:49
FAIL
NEXT BP
7:49
0 d
7:49
7:49
18 - 12.22
that appears next depends on how BUMP.EXPD is set in User Mode (see “BUMP.EXPD” on page 69). The three possible screens are described below. If a bump test is not due, the instrument shows how many days are left until a bump test is due.
BUMP.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 perform a bump test. The instrument takes you straight to the BUMP CYL A screen in User Mode’s BUMP item. See “Performing a Bump Test (BUMP)” on page 47 for bump test instructions.
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 continue without performing a bump test, press and release AIR.
: To
BUMP.EXPD set to
CANT USE
Buzzer sounds double pulsing tone None
The GX-3R cannot be used until a
:
successful bump test has been per-
formed. Press and release POWER MODE to perform a bump test. The instrument takes you straight to the BUMP CYL A screen in User Mode’s BUMP item. If you don’t press POWER MODE, the instrument automatically goes to the BUMP CYL A screen after 6 seconds. See “Performing a Bump Test (BUMP)” on page 47 for bump test instructions.
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 success-
ful, the screen above will again appear in the startup sequence.
BUMP.EXPD set to
NONE
• Option A, Perform bump test To perform a bump test, press and release POWER MODE. The instrument takes you straight to the BUMP CYL A screen in User Mode’s BUMP item.
• Option B, Bypass message continue without performing a bump test, wait a few seconds for the instrument to continue with its startup sequence.
: To
:
5 . The Date/Time Screen appears for a few seconds.
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6 . The Battery Voltage Screen appears for a few seconds.
AL - L V
7:49
3.8
bAtt
7:49
CO H2S
ppm ppm
CH4 O2
%LEL %
F.S .
7:49
2000 200.0
CO ppm H2S ppm
100 40.0
CH4 %LEL O2 %
WARNING
7:49
25 5.0
CO ppm H2S ppm
10 19.5
CH4 %LEL O2 %
ALARM
7:49
50 30.0
CO ppm H2S ppm
25 18.0
CH4 %LEL O2 %
ALARM H
7:49
1200 100.0
CO ppm H2S ppm
50 23.5
CH4 %LEL O2 %
STEL
7:49
200 5.0
CO ppm H2S ppm
TWA
7:49
25 1.0
CO ppm H2S ppm
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 pg.101 for a description of how to change this parameter.
7 . The following screens display for 3 seconds each: the Gas Name Screen, the Full Scale
Screen, the Warning Setpoint Screen, the Alarm Setpoint Screen, the Alarm H Setpoint Screen, the STEL Alarm Screen, and TWA Alarm Screen.
NOTE: If the combustible gas is set to something other than CH4 or H2 in Gas Select
Mode, the combustible channel is displayed as “HC” and the gas formula for the combustible gas sensor’s target gas appears during startup.
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8 . If ID DISP is set to ON (factory setting is OFF, see pg.102), the User ID Screen appears
U_ID_001
7:49
USEr Id
S_ID_001
7:49
Stn Id
SENSOR
7:49
FAIL
CH4 %LEL
AUTOZERO
7:49
YES / MODE
7:49
NO / AIR
7:49
for a few seconds, followed by the Station ID Screen.
9 . If the GX-3R experiences a sensor failure during start up, the display shows which
sensor failed and the buzzer sounds a double pulsing tone once per second. In the example below, the combustible gas sensor failed.
Press and release POWER MODE to acknowledge the failure and continue. “- - - -” replaces the failed sensor’s gas reading. Replace the failed sensor as soon as possible.
10 . If AUTOZERO is set to ON (factory setting is OFF, see pg.102), the instrument
prompts you to do an auto zero. An auto zero operation sets the combustible gas, H
S,
2
and CO channels to zero and the OXY channel to 20.9%.
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.
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11 . The combustible gas sensor actually contains 2 separate sensors: a standard catalytic
LIMITED
7:49
GAS LIST
HC
7:49
0 0.0
CO ppm H2S ppm
0 20.9
CH4 %LEL O2 %
sensor and a backup, poison-resistant sensor that is resistant to sensor poisons like silicone. An HC GAS LIST LIMITED alarm indicates that the standard sensor has a reduced output, possibly due to one or more sensor poisons in the environment, and that the poison-resistant sensor is being used to provide gas readings. The poison-resistant sensor has a limited list of detectable gases. The table shown on pg.36 shows which gases can and cannot be detected after receiving an HC GAS LIST LIMITED alarm.
If your application requires detection of a gas still detectable after an HC GAS LIST LIMITED alarm (like methane or isobutane), there is no need to replace the combustible gas sensor.
However, if your application requires detection of a gas not detectable after an HC GAS LIST LIMITED alarm (like methanol or ethanol), you must replace the combustible gas sensor as soon as possible.
The following screen displays, the LEDs flash, and the instrument beeps. Press and release POWER MODE to confirm the limited gas list and continue to
Measuring Mode.
12 . At the end of the 45 second warmup, the GX-3R begins monitoring for gas in Measuring
Mode. The Measuring Mode Screen displays the current gas reading for each target gas.

Performing a Demand Zero

Perform a demand zero before using the GX-3R. This sets the combustible gas, H2S, and CO channels to zero and the OXY channel to 20.9%.
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 GX-3R”. 3 . Press and hold AIR. The LCD prompts you to continue holding AIR and the buzzer
pulses while you hold the button (if KEY TONE is set to ON in User Mode). 4 . Continue to hold AIR until the LCD prompts you to release it. The GX-3R sets the fresh
air reading for all channels. Start up is complete and the unit is now ready for
monitoring.

Turning Off the GX-3R

1 . Press and hold POWER MODE. 2 . TURN 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 TURN OFF disappears from the display. 4 . If you plan to leave the instrument off for an extended period of time, see pg.91.
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Measuring Mode Operation

S 7:49
0 0.0
CO ppm H2S ppm
0 20.9
CH4 LEL O2 %
7:49
0 0.0
CO ppm H2S ppm
0 20.9
CH4 %LEL O2 %
When the GX-3R completes its startup sequence, it is in Measuring Mode. In Measuring Mode the GX-3R continuously monitors the sampled atmosphere and displays the target gas concentrations. The GX-3R is considered to be in Normal Operation if there are no alarm indications.
Heart Symbol
: The heart symbol in the upper left corner of the LCD indicates the operation status and blinks when normal. A microprocessor error causes the heart symbol to stop flashing or to disappear.
Check Mark
: If BUMP.RMDR is set to ON and if a bump test is not due, a check mark
appears in the upper left corner of the LCD. “S”: If the instrument is operating in Stealth Mode, an “S” appears at the top of the LCD. Backlight
: In a low-light environment, press and release either button to turn on the display
backlight. See pg.75 to program backlight duration. Confirmation/Non-Compliance Indicator: If the BEEP menu item in User Mode is set to
anything other than OFF, the GX-3R gives periodic indications to confirm that it’s operating or to indicate a non-compliance (pg.73).

Monitoring an Area

1 . Start up the GX-3R as described above in “Start Up” on page 18. It is now in Measuring
Mode.
2 . Take the GX-3R to the monitoring area. 3 . Wait at least 15 seconds and observe the display for gas readings. If a reading is
observed, allow the reading to stabilize to determine the gas concentrations present.
If you are sampling with an aspirator adapter, see pg.27. 4 . If a gas alarm occurs, take appropriate action. See pg.30. 5 . Do not expose the GX-3R to rain.
6 . The GX-3R’s IP 66/68 ratings do not imply that the GX-3R will detect gas during and
after exposure to those conditions. If exposure occurs, dry the instrument with a cloth
and perform a bump test as described on pg.47. 7 . If the GX-3R gets exposed to flammable liquids:
a. Wipe the instrument off with a cloth dampened with water.
b. Replace the filters as described on pg.83 and pg.85 if they became saturated
c. Perform a bump test as described on pg.47.
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8 . If you suspect that the GX-3R is not operating correctly:
a. Take the GX-3R to a fresh air environment and perform a demand zero as described
on pg.23.
b. Perform a bump test as described on pg.47.

Combustible Gas Detection

There are three issues to keep in mind when monitoring for combustible gas.
Response
The combustible gas sensor responds to any combustible gas. The standard calibrated target gas for the combustible gas channel is methane (CH
calibrated to a different combustible gas, such as hexane or propane, the gas name right above the readings displays as “HC”.
Automatic Conversion
The GX-3R can automatically display converted target gas readings if the instrument’s calibrated target gas is methane or isobutane. See “Combustible Sensor Target Gas Conversion (LIST)” on page 36.
Manual Conversion
You can manually calculate a converted target gas reading using Table 4 below if the instrument’s calibrated target gas is methane. The table below lists the conversion factors for several hydrocarbon gases if the GX-3R is calibrated to methane.
To use this table, multiply the display reading on the combustible gas channel by the factor in the appropriate row to obtain the actual gas concentration. For example, if you are detecting ethylene and the display reads 10% LEL for the combustible gas channel, you actually have 10% LEL x 0.83 = 8.3% LEL ethylene present.
). If the instrument is setup for and
4
Table 4: LEL Hydrocarbon Conversion Factors
Gas
Acetone 2.22 IPA 1.64
Acetylene 1.43 Isobutane 1.10
Benzene 2.50 MEK 2.63
Butadiene 1.52 Methane 1.00
Cyclopentane 1.45 Methanol 1.82
DME 1.16 MIBK 4.00
Ethane 0.94 MMA 3.33
Ethanol 1.96 Nonane 9.09
Ethyl Acetate 2.86 Propane 1.12
Ethylene 0.83 Propylene 0.97
Heptane 3.13 THF 2.33
Hexane 1.89 Toluene 4.55
LEL Conversion Factor
(from CH
Cal.)
4
Gas
LEL Conversion Factor
(from CH
Cal.)
4
Hydrogen 0.95 Xylene 7.69
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Overscale Protection
The GX-3R protects the combustible gas sensor by temporarily turning off the sensor power if levels exceeding 100% LEL are detected. Nevertheless, combustible gas concentrations above 100% LEL can still affect the zero level or calibration of the combustible gas sensor.
CAUTION: Do not expose the combustible gas sensor to high concentrations of
combustible gas such as that from a butane lighter. Exposure to high concentrations of combustible gas may adversely affect the performance of the sensor.
CAUTION: Any rapid increase in the combustible gas reading on the combustible gas
channel followed by a declining or erratic reading may indicate a gas concentration above the LEL which may be hazardous.
Damaging Gases
Some gases such as silicone vapors, chlorinated hydrocarbons, and sulphur compounds can contaminate the sensor’s detection elements. This causes sensor damage and/or a reduced response to combustible gas. Make every effort to avoid these gases.
The H
S scrubber disks protect the combustible sensor from H2S, but you should avoid other
2
sulphur compounds.
HC GAS LIST LIMITED Alarm
An HC GAS LIST LIMITED alarm can occur at startup or after a calibration. The combustible gas sensor actually contains 2 separate sensors: a standard catalytic sensor
and a backup, poison-resistant sensor that is resistant to sensor poisons like silicone. An HC GAS LIST LIMITED alarm indicates that the standard sensor has a reduced output, possibly due to one or more sensor poisons in the environment, and that the poison-resistant sensor is being used to provide gas readings. The poison-resistant sensor has a limited list of detectable gases. The table shown on pg.36 shows which gases can and cannot be detected after receiving an HC GAS LIST LIMITED alarm.
If your application requires detection of a gas still detectable after an HC GAS LIST LIMITED alarm (like methane or isobutane), there is no need to replace the combustible gas sensor.
However, if your application requires detection of a gas not detectable after an HC GAS LIST LIMITED alarm (like methanol or ethanol), you must replace the combustible gas sensor as soon as possible.

Oxygen-Enriched Atmospheres

The GX-3R is not intended for use in oxygen-enriched atmospheres.
WARNING: Do not use the GX-3R in an environment whose oxygen concentration is
above 21% .

H2-Compensated CO Detection

• GX-3R displays CO readings.
•H
reading is not displayed but “H2 RICH” appears once H2 concentration rises above
2
2000 ppm.

Interference Information

Some gases interfere with CO and H2S sensors. For a complete list of these gases, see pg.116.
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Aspirator Adapter Sampling

Probe
Hose
AspiratorBulb
FRONT
GX-3R
AIR
POWER
MOD E
CO/H
2
S LEL O
2
Sample C up
Figure 6: GX-3R Aspirator Adapter
The aspirator adapter accessory is used when it is necessary to draw sample from an area that cannot be entered or that must be checked for safety before entry, such as a tank or confined space.
NOTE: The CSA combustible performance certification for the GX-3R does not include
the aspirator adapter.
1 . Turn on the GX-3R as described on pg.18. 2 . Attach the sample cup to the GX-3R. Use the label and imprinting to make sure that the
sample cup gets installed in the correct orientation relative to the GX-3R. Be sure the
sample cup is pushed on all the way. 3 . Screw the probe onto the threaded end of the hose. 4 . Attached the hose and probe to the aspirator bulb. 5 . Insert the end of the probe into the area to be sampled. 6 . Squeeze and release the aspirator bulb 15 times. 7 . Monitor the readings and note if any alarms occur. The readings will peak shortly after
the last squeeze and may decrease before all the channels can be checked. Use the Peak
screen in Display Mode to see the maximum readings for each channel (see pg.35).
NOTE: The peak readings for each channel are saved until a higher peak is recorded, the
peak readings are reset, or the instrument is turned off. If a gas is present but the level does not exceed the previous peak level, the previous peak will be displayed on the Peak Screen.
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Alarms

This section covers alarm indications in Measuring Mode. It also describes responding to and resetting an alarm condition.
NOTE: False alarms may be caused by radio frequency (RF) or electromagnetic (EMI)
interference. Keep the GX-3R away from RF and EMI sources such as radio transmitters or large motors.

Alarm Indications

The GX-3R buzzer sounds an alarm, the LEDs flash, and the vibrator pulses when any sort of alarm condition or failure occurs. If the GX-3R is operating in Stealth Mode, the buzzer does not sound and the vibrator’s operation depend on the VIB setting in Gas Select Mode’s
STEALTH menu item. See pg.113 for more information.
NOTE: If an alarm condition occurs while you are in Display Mode, the GX-3R
automatically returns to the Measuring Mode screen.
The table below summarizes the types of alarms produced by the GX-3R and their indications.
Table 5: Alarm Types and Indications
Alarm Type Visual Indications Other Indications
War nin g
Concentration of gas rises above the Warning setting or falls below the Warning setting for O
Alarm
Concentration of gas rises above the Alarm setting or falls below the Alarm setting for O
Alarm H
Concentration of gas rises above the Alarm H setting.
.
2
.
2
• Affected channel’s gas reading, gas name, and units flash
• WARNING appears at the bottom of the LCD
• Alarm LEDs flash in circle sequence once per second
• Backlight turns on
• Affected channel’s gas reading, gas name, and units flash
• ALARM appears at the bottom of the LCD
• Alarm LEDs flash in circle sequence twice per second
• Backlight turns on
• Affected channel’s gas reading, gas name, and units flash
• ALARM H appears at the bottom of the LCD
• Alarm LEDs flash in circle sequence twice per second
• Backlight turns on
• High-low tone sounding once per second
• Vibrator pulses once per second
• High-low tone sounding twice per second
• Vibrator pulses twice per second
• High-low tone sounding twice per second
• Vibrator pulses twice per second
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Table 5: Alarm Types and Indications
Alarm Type Visual Indications Other Indications
TWA or STEL
Concentration of CO or H
above the TWA or STEL alarm set-
ting.
H2 RICH (for GX-3Rs with H
compensated CO sensor)
Concentration of hydrogen rises
above 2000 ppm (parts per mil-
lion).
Over Range • Affected channel’s gas reading is
S rises
2
• Affected channel’s gas reading, gas name, and units flash
• TWA or STEL appears at the bottom of the LCD
• Alarm LEDs flash in circle sequence once per second
• Backlight turns on
• H2 and rich alternate in the lower
-
2
right corner
• OVER appears at the bottom of the LCD
• Alarm LEDs flash twice per second
• Backlight turns on
replaced with a flashing
• Gas name and units flash
• OVER appears at the bottom of the LCD
• Alarm LEDs flash in circle sequence twice per second
• Backlight turns on
• High-low tone sounding once per second
• Vibrator pulses once per second
• High-low tone sounding twice per second
• Vibrator pulses twice per second
• High-low tone sounding twice per second
• Vibrator pulses twice per second
Minus Over Range • 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 in circle sequence twice per second
• Backlight turns on
Low Battery Warning • The last bar in the battery icon starts
flashing
Dead Battery Alarm • Gas readings disappear. FAIL
appears in the middle of the screen and BATTERY appears at the bottom of the screen.
• Alarm LEDs flash once per second
Sensor Failure • SENSOR appears at the bottom of
the screen and the failed sensor(s) are indicated with FAI L under the gas name.
• Alarm LEDs flash once per second
• High-low tone sounding twice per second
• Vibrator pulses twice per second
None
Double pulsing tone once per second
Double pulsing tone once per second
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Table 5: Alarm Types and Indications
Alarm Type Visual Indications Other Indications
HC GAS LIST LIMITED • HC GAS LIST LIMITED appears
on the screen.
• Alarm LEDs flash once per second
Clock Failure • FAIL appears in the middle of the
screen and CLOCK appears at the bottom of the screen.
• Alarm LEDs flash once per second
System Failure • FAIL SYSTEM appears at the
bottom of the screen and an error code displays in the middle
• Alarm LEDs flash once per second
Double pulsing tone once per second
Double pulsing tone once per second
Double pulsing tone once per second

Responding to Alarms

This section describes response to gas, over range, battery, sensor failure, HC GAS LIST LIMITED, clock failure, and system failure alarms.
Responding to Gas Alarms
1 . Determine which gas alarm has been activated. 2 . Follow your established procedure for an increasing gas condition or a decreasing
oxygen condition.
3 . Reset the alarm as necessary or allowed.
a. If LATCHING is set to ON (factory setting) in Maintenance Mode, the gas reading
must fall below (or rise above for an oxygen low alarm) an alarm setting before you can reset the alarm condition using POWER MODE or AIR.
b. If LATCHING is set to OFF in Maintenance Mode, the alarm condition will
automatically reset when gas reading falls below (or rises above for an oxygen low alarm) an alarm setpoint.
Responding to an H2 RICH Alarm (H
-Compensated CO Sensor Only)
2
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 combustible gas, toxic
gas, or oxygen concentration. Confirm the gas concentration with a different GX-3R or with another gas detecting device.
CAUTION: High off-scale readings may indicate an explosive concentration.
PRUDENCE: Des lectures élevées hors échelle peuvent indiquer une concentration
explosive.
1 . Determine which channel is in alarm.
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2 . Follow your established procedure for an extreme gas condition. 3 . If LATCHING is set to ON (factory setting) in Maintenance Mode, reset the alarm
using POWER MODE or AIR once the alarm condition clears. 4 . Calibrate the GX-3R as described on pg.43. 5 . If the over range condition continues or if you are not able to successfully calibrate the
unit, you may need to replace the sensor that has triggered the over range alarm. 6 . If the over range condition continues after you have replaced the sensor, contact RKI
Instruments, Inc. for further instructions.
Responding to Battery Alarms
WARNING: The GX-3R is not operational as a gas monitoring device during a dead
battery alarm. Take the Model GX-3R to a non-hazardous area and replace or recharge the batteries as described in “Recharging the Batteries” on page 81.
The GX-3R is fully functional during a low battery warning. However, only 1-2 hours of operating time remain. The amount of operating time left depends on LCD backlight use and the alarm frequency. Recharge the battery as soon as possible as described in “Recharging the Batteries” on page 81.
NOTE: Alarms and the LCD back light consume battery power and reduce the amount of
operating time remaining.
Responding to Sensor Failure Alarms
1 . Determine which sensor triggered the sensor failure alarm. 2 . Calibrate the failed sensor, as described on pg.43. 3 . If the sensor failure continues or if the sensor could not be calibrated, replace the sensor
as described on pg.86. 4 . If the sensor failure condition continues after you have replaced the sensor, contact RKI
Instruments, Inc. for further instructions.
Responding to an HC GAS LIST LIMITED Alarm
An HC GAS LIST LIMITED alarm can occur at startup or after a calibration. 1 . Press and release POWER MODE to acknowledge the alarm. The combustible gas sensor actually contains 2 separate sensors: a standard catalytic sensor
and a backup, poison-resistant sensor that is resistant to sensor poisons like silicone. An HC GAS LIST LIMITED alarm indicates that the standard sensor has a reduced output, possibly due to one or more sensor poisons in the environment, and that the poison-resistant sensor is being used to provide gas readings. The poison-resistant sensor has a limited list of detectable gases. The table shown on pg.36 shows which gases can and cannot be detected after receiving an HC GAS LIST LIMITED alarm.
If your application requires detection of a gas still detectable after an HC GAS LIST LIMITED alarm (like methane or isobutane), there is no need to replace the combustible gas sensor.
However, if your application requires detection of a gas not detectable after an HC GAS LIST LIMITED alarm (like methanol or ethanol), you must replace the combustible gas sensor as soon as possible.
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Responding to Clock Failure Alarms
CLOCK
7:49
FAIL
SYSTEM
7:49
031
FAIL
A clock failure alarm occurs if the unit’s internal clock malfunctions. A clock failure alarm might also occur if the battery becomes too drained during storage. See pg.91 for storage information.
1 . Press and release POWER MODE to continue into Measuring Mode.
CAUTION: If you operate the instrument after a clock failure, data will still be logged but
the date/time will be incorrect. Set the date/time as described on pg.77 as soon as possible to ensure logged data uses the correct date/time.
2 . Attempt to set the date using the DATE menu item in User Mode. See pg.77. 3 . If the date cannot be set correctly, contact RKI Instruments, Inc. as soon as possible.
Responding to System Failure Alarms
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 6: Error Code Explanation
Error Code Explanation
000 ROM failure
010 RAM failure
021 FRAM failure
031 FLASH memory failure
080 Acceleration sensor failure
081 PCB failure
082 Temperature sensor failure
3 . If the error code is anything but 031 as shown above, the instrument cannot be used.
Contact RKI Instruments, Inc. as soon as possible.
If the error code is 031, you may press and release POWER MODE to continue into
Measuring Mode if the instrument must be used temporarily.
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CAUTION: There will be no datalogging function if you operate the instrument after a 031

Data Logging

The GX-3R 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.
To utilize the GX-3R’s downloading capability, you will need the GX-3R Data Logger Management Program and a computer with an infrared port or a USB port that runs one of the following operating systems: Windows 7, Windows 8, or Windows 10. If your computer has an infrared port, then no additional accessories are needed to download data from the GX-3R. If your computer does not have an infrared port but does have a USB port, a USB/IrDA adapter cable can be used to download data from the GX-3R. The GX-3R Data Logger Management Program is available at . The USB/IrDA adapter cable is available from RKI Instruments, Inc.
The data logging capacity depends on how often the GX-3R stores data, how many channels are active, and how often the GX-3R 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 has three sensors, is only turned on once, and there are no alarm occurrences. The data logging interval time must be set using the GX-3R Data Logger Management Program.
system failure. Contact RKI Instruments, Inc. as soon as possible.
Table 7: Data Logging Capacity
Interval Time Data Logging Time
10 seconds 10 hours
20 seconds 20 hours
30 seconds 30 hours
1 minute 60 hours
3 minutes 180 hours
5 minutes (factory setting) 300 hours
10 minutes 600 hours
For a complete description of the Data Logger Management Program and procedures for downloading data to a computer, see the GX-3R Data Logger Management Program Operator’s Manual.
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Chapter 4: Display Mode

This section describes Display Mode which is accessible from Measuring Mode. See Table 8 below for a list of Display Mode’s menu items, a short description of each item, and the page number for further description.
Table 8: Display Mode Menu Items
Display Mode Menu
Item
Description
PEAK (pg.35) Displays each sensor’s Peak reading.
STEL (pg.36) Displays the STEL readings (CO and H
TWA (pg.36) Displays the TWA readings (CO and H
LIST (pg.36)
A
Change the target gas for the catalytic sensor.
•CH4 (methane)
• i-C4H10 (isobutane)
• H2 (hydrogen)
• CH3OH (methanol)
• C2H2 (acetylene)
• C2H4 (ethylene)
• C2H6 (ethane)
• C2H5OH (ethanol)
• C3H6 (propylene)
• C3H6O (acetone)
• C3H8 (propane)
• C4H6 (butyne)
• C5H10 (cyclopentane)
S only).
2
S only).
2
• C6H6 (benzene)
• n-C6H14 (hexane)
• C7H8 (toluene)
• n-C7H16 (heptane)
• C8H10 (xylene)
• n-C9H20 (nonane)
• EtAc (ethyl acetate)
• IPA (isopropyl alcohol)
• MEK (methyl ethyl ketone)
• MMA (methyl methacrylate)
• DME (dimethyl ether)
• MIBK (methyl isobutyl ketone)
• THF (tetrahydrofuran)
USER ID (pg.38)
STN ID (pg.39)
CAL DATA (pg.40)
B
B
C
BUMP DATA (pg.41)
View and/or change the User ID.
View and/or change the Station ID.
Displays each sensor’s last calibration date.
D
Displays each sensor’s last bump test date.
TEMP (pg.41) Displays the current date, time, and temperature.
ALARM--PT (pg.42) View alarm points
A
Only appears if DISP SET is set to ON in User Mode (factory setting) and if CH4 or i-C4H10 is selected for the
combustible gas in Gas Select Mode.
B
Only appears if DISP SET is set to ON in User Mode (factory setting) and if ID DISP is set to ON in Mainte-
nance Mode (factory setting is OFF).
C
Only appears if CAL RMDR is set to ON in User Mode (factory setting).
D
Only appears if BUMP.RMDR is set to ON in User Mode (factory setting is OFF).
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Tips for Using Display Mode

PEAK
7:49
135 37.5
CO ppm H2S ppm
24 17.3
CH4 %LEL O2 %
HOLD AIR
7:49
CLEAr
RELEASE
7:49
CLEAr
• To enter Display Mode and scroll from one menu 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 direction of
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 the main menu, press and
release POWER MODE.
NOTE: Each screen displays for 20 seconds. If you do not press a button within 20 seconds,
the GX-3R automatically returns to Measuring Mode.

Peak Screen (PEAK)

The peak screen displays the highest (lowest for oxygen) concentrations detected since the GX-3R was turned on. Peak readings are stored in the GX-3R’s memory until a higher level is detected (lower for oxygen), the peak reading is cleared, or the GX-3R is turned off.
The lunch break feature enables the GX-3R to save peak readings when it is turned off so it can continue with the same peaks when it is turned on again. See pg.72 for instructions to turn the lunch break feature on (default is off).
To clear the peak readings, do the following: 1 . After entering Display Mode, press and release POWER MODE until PEAK appears.
2 . Press and hold AIR until the screen prompts you to release it.
3 . The peak readings are reset and the unit returns to the Peak Screen.
If you do not want to clear the peak readings, release AIR before the above screen
sequence occurs. The unit returns to the Peak Screen.
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STEL Screen (STEL)

STEL
7:49
10 2.0
CO ppm H2S ppm
TWA
7:49
5 0.5
CO ppm H2S ppm
The STEL Screen displays the short term exposure limit (STEL) readings for H2S and CO only. The STEL reading is the average reading over the last 15 minutes.

TWA Screen (TWA)

The TWA Screen displays the time weighted average (TWA) readings for H2S and CO only.
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 0 value. If LUNCH is set to OFF (factory setting), the TWA is cleared when the GX-3R is turned off.
If LUNCH is set to ON, the GX-3R remembers TWA readings when it is turned off so it can continue them when it is turned on again. See pg.72 for instructions to turn the lunch break feature on (default is off).

Combustible Sensor Target Gas Conversion (LIST)

This screen only appears if DISP SET in User Mode is set to ON (factory setting) and if the instrument’s calibrated target gas is CH4 or iC4H10 (select target gas in Gas Select Mode’s GAS COMB item, calibrate with target gas in User Mode’s GAS CAL item).
The LIST screen allows you to select a converted calibration. It does not change the calibrated target gas. You must go to Gas Select Mode’s GAS COMB item to change the calibrated
Selecting a converted target gas in LIST (based on a CH4 or iC4H10 calibration) does not provide the same reading accuracy as selecting a calibrated target gas in Gas Select Mode’s GAS COMB item and calibrating with that target gas in User Mode.
Selecting a converted target gas in LIST does not mean that the combustible gas sensor will respond only to that gas. The combustible gas sensor responds to a number of gases regardless of the target gas selection.
However, if H2 is selected as the target gas in LIST, the sensor will not respond to the gases listed with an “x” in the “Available Target Gas Conversions During HC GAS LIST LIMITED Status” column of the table below.
If you select a new converted target gas, the change is saved if you turn the instrument off and on.
target gas.
target gas based on a CH4 or iC4H10
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Available Converted Target Gases
LIST
7:49
HC GAS
Based on Calibrated Target Gas
Gas
CH4 (methane) - x O
i-C4H10 (isobutane) O - O
H2 (hydrogen) O O O
CH3OH (methanol) O O x
C2H2 (acetylene) O O O
C2H4 (ethylene) O O O
C2H6 (ethane) O x O
C2H5OH (ethanol) O O x
C3H6 (propylene) O O O
C3H6O (acetone) O O x
C3H8 (propane) O x O
C4H6 (butyne) O O O
C5H10 (cyclopentane) O O O
C6H6 (benzene) O O x
n-C6H14 (hexane) O O O
C7H8 (toluene) O O x
n-C7H16 (heptane) O O O
C8H10 (xylene) O O x
n-C9H20 (nonane) O O x
EtAc (ethyl acetate) O O x
IPA (isopropyl alcohol) O O x
MEK (methyl ethyl ketone) O O x
MMA (methyl methacrylate) O O x
DME (dimethyl ether) O O x
MIBK (methyl isobutyl ketone) O O x
THF (tetrahydrofuran) O O x
x = not available O = available
(Selected in Gas Select Mode)
CH4 (methane)
i-C4H10
(isobutane)
Available Converted
Target Gases During
HC GAS LIST
LIMITED Status
1 . After entering Display Mode, press and release POWER MODE until LIST appears.
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2 . Press and release AIR to enter the screen. The current gas flashes at the bottom of the
CH4
7:49
SELECT
HC GAS
U_ID_002
7:49
USEr Id
CHG / AIR
7:49
USEr Id
NO / MODE
7:49
USEr Id
U_ID_002
7:49
USEr Id
screen.
3 . Use AIR to scroll through the list of gases. 4 . When the desired gas is displayed, press and release POWER MODE. The changes are
saved and the instrument returns to the LIST screen. 5 . The gas formula displays at the bottom of the Measuring Mode screen. The gas selection
remains selected if you turn the instrument off and on again.

Changing the User ID (USER 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 user ID from the 128 user IDs that are stored in the GX-3R’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 GX-3R user during a data logging session. User IDs can only be selected
use the GX-3R Datalogging Program. 1 . After entering Display Mode, press and release POWER MODE until the USER ID
screen sequence appears.
in this menu item. In order to edit the 128 user IDs, you must
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
38 • Chapter 4: Display Mode GX-3R Operator’s Manual
in Display Mode.
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Changing the Station ID (STN ID)

S_ID_002
7:49
Stn Id
CHG / AIR
7:49
Stn Id
NO / MODE
7:49
Stn Id
S_ID_002
7:49
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 GX-3R’s memory. Before a station ID is selected on a brand new instrument, the station ID is “----------”. The factory-installed station IDs have a “S_ID_XXX” format.
The station ID provides a way to identify the GX-3R location 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 GX-3R Datalogging 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.
GX-3R Operator’s Manual Chapter 4: Display Mode • 39
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Last Successful Calibration Date (CAL DATA)

CAL DATA
7:49
dISP
CAL DATA
7:49
CH4
18- 12. 20
CAL DATA
7:49
O2
18- 12. 20
CAL DATA
7:49
H2S
18- 12. 20
CAL DATA
7:49
CO
18- 12. 20
AIR
AIR
AIR
AIR
The CAL DATA screen shows the date of each installed sensor’s last successful calibration. This screen only appears if CAL.RMDR is set to ON in User Mode.
1 . After entering Display Mode, press and release POWER MODE until CAL DATA
appears.
2 . Press AIR to enter the CAL DATA screen and to scroll through the installed sensors.
3 . When you are done viewing the last calibration date for the sensors, press and release
POWER MODE to return to the CAL DATA screen in Display Mode.
40 • Chapter 4: Display Mode GX-3R Operator’s Manual
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Last Successful Bump Test Date (BUMP DATA)

BUMP DATA
7:49
dISP
BUMP DATA
7:49
CH4
18- 12. 20
BUMP DATA
7:49
O2
18- 12. 20
BUMP DATA
7:49
H2S
18- 12. 20
BUMP DATA
7:49
CO
18- 12. 20
AIR AIR
AIR
AIR
22°C
7:49
7:49
18- 12. 26
The BUMP DATA screen shows the date of each installed sensor’s last successful bump test. This screen only appears if BUMP.RMDR is set to ON.
1 . After entering Display Mode, press and release POWER MODE until BUMP DATA
appears.
2 . Press AIR to enter the BUMP DATA screen and to scroll through the installed sensors.
3 . When you are done viewing the last bump test date for the sensors, press and release
POWER MODE to return to the BUMP DATA screen in Display Mode.

Date, Time, Temperature Screen (TEMP)

The TEMP screen shows the instrument’s date and time and the surrounding area’s temperature.
GX-3R Operator’s Manual Chapter 4: Display Mode • 41
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Alarm Points Screen (ALARM--PT)

ALARM--PT
7:49
dISP
F. S.
7:49
2000 200.0
CO ppm H2S ppm
100 40.0
CH4 %LEL O2 %
WARNING
7:49
25 5.0
CO ppm H2S ppm
10 19.5
CH4 %LEL O2 %
ALARM
7:49
50 30.0
CO ppm H2S ppm
25 18.0
CH4 %LEL O2 %
ALARM H
7:49
1200 100.0
CO ppm H2S ppm
50 23.5
CH4 %LEL O2 %
STEL
7:49
200 5.0
CO ppm H2S ppm
TWA
7:49
25 1.0
CO ppm H2S ppm
AIR
AIR
AIR
AIR
AIR
AIR
The Alarm Points Screen shows the gas alarm settings for all active channels. 1 . After entering Display Mode, press and release POWER MODE until ALARM--PT
appears.
2 . Press and release AIR. The Full Scale Settings screen appears and shows full scale
settings for each channel. 3 . Use AIR to scroll through the Warning, Alarm, Alarm H, STEL, and TWA settings.
4 . While viewing the alarm settings for a particular alarm point, press and release AIR and
5 . Press and release POWER MODE to return to the Alarm Points Screen.
POWER MODE at the same time to simulate the alarm conditions. The buzzer will
sound, the LEDs will flash, and the instrument will vibrate just as it would if the
displayed condition was actually happening.
42 • Chapter 4: Display Mode GX-3R Operator’s Manual
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Page 43

Chapter 5: User Mode and Calibration

Overview

This section describes the GX-3R in User Mode. See Table 9 below for a list of the items found in User Mode, the page that the menu item’s instructions can be found on, and a short description of the menu item.
Table 9: User Mode Menu Items
User Mode Menu Item
BUMP (pg.47) Perform a bump test.
BUMP CYL X
START Begin the warmup sequence and enter Measuring Mode.
ESCAPE Return to the BUMP menu item.
GAS CAL (pg.54) Perform a fresh air adjustment, perform a span adjustment, change the calibration gas con-
centration, set the cylinder group.
AIR CAL (pg.54)
AUTO CAL (pg.55)
Perform a bump test on the gases selected for Cylinder X (A-E cylinders available)
Perform a fresh air adjustment.
AUTO CAL CYL X
START Begin the warmup sequence and enter Measuring Mode.
CAL-P Set the calibration gas concentration for each gas.
CYL SEL Assign a cylinder (A-E) to each gas (all 4 gases set to Cyl-
Description
Perform an automatic span adjustment on the gases selected for Cylinder X (A-E cylinders available).
inder A is the default). For single cal operation, you would assign each gas its own cylinder.
ESCAPE Return to the AUTO CAL menu item.
ESCAPE Return to the GAS CAL menu item.
CAL SET (pg.64) Change calibration parameters.
CAL RMDR (pg.64)
CAL INT (pg.65)
ON
(factory setting): The instrument notifies the user upon startup when a calibration is due. Notification type depends on CAL EXPD setting below.
OFF
: No notification upon startup when a calibration is due.
How often the instrument needs to be calibrated. Options: 1 - 1000 days (factory setting is 90 days)
GX-3R Operator’s Manual Chapter 5: User Mode and Calibration • 43
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Table 9: User Mode Menu Items
User Mode Menu Item
CAL SET (cont’d) CAL EXPD
(pg.65)
ESCAPE Return to the CAL SET menu item in User Mode.
BUMP SET (pg.66)
Change bump test parameters.
SETTINGS (pg.66)
Description
Defines what action must be taken if a calibration is due upon startup.
CONFIRM
calibration is due and continue to Measuring Mode.
CANT USE
is performed.
NONE
continues.
GAS TIME How long gas is applied during a bump test.
CHECK Percentage of calibration gas concentration that the bump
CAL TIME How long gas is applied during a calibration. GAS TIME
AUTO CAL ON
(factory setting): Press and release AIR to acknowledge that
: Cannot enter Measuring Mode until a successful calibration
: A screen indicates that calibration is due but warmup sequence
Choices: 30 (factory setting), 45, 60, 90 seconds
test reading must be within in order to pass bump. Options: 10%, 20%, 30%, 40%, 50% (factory setting)
is deducted from this time. Options: 90 (factory setting) or 120 seconds
(factory setting): If a bump test fails, a calibration
automatically starts.
OFF
: If a bump test fails, a calibration does not automati-
cally start.
BUMP.RMDR (pg.68)
BUMP INT (pg.69)
BUMP.EXPD (pg.69)
ESCAPE Return to the BUMP SET menu item in User Mode.
ALARM-PT (pg.70)
LUNCH (pg.72) ON
Set alarm points for all channels (WARNING, ALARM, ALARM H, STEL, TWA) or reset all alarms to their default settings.
ings at startup.
OFF
ings every time it’s turned on.
ESCAPE Return to the SETTINGS menu item in BUMP SET.
ON
: The instrument notifies the user upon startup when a bump test is
due. Notification type depends on BUMP.EXPD setting below.
OFF
(factory setting): No notification upon startup when a bump test is
due.
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
bump test is due and continue to Measuring Mode.
CANT USE
is performed.
NONE
continues.
: Lunch break feature is on. Instrument asks if you want to resume TWA and PEAK read-
(factory setting): Lunch break feature is off. Instrument resets TWA and PEAK read-
(factory setting): Press and release AIR to acknowledge that
: Cannot enter Measuring Mode until a successful bump test
: A screen indicates that bump test is due but warmup sequence
44 • Chapter 5: User Mode and Calibration GX-3R Operator’s Manual
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Table 9: User Mode Menu Items
User Mode Menu Item
BEEP (pg.73) Set confirmation beep parameters.
BEEP SEL (pg.73)
BEEP INT (pg.74)
ESCAPE Return to the BEEP menu item in User Mode.
LED
: LEDs flash and instrument vibrates based on interval defined in
BEEP INT to confirm instrument is still operating. BUZZER defined in BEEP INT to confirm instrument is still operating. LED+BUZZ on interval defined in BEEP INT to confirm instrument is still operating. BUMP/CAL
bump test or calibration is due.
ALM ALRT
instrument goes into a gas alarm.
B/C/ALM
a) bump test is due, b) calibration is due, or c) instrument goes into a gas alarm.
OFF
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 fac-
tory setting is 5 minutes.
: Buzzer sounds and instrument vibrates based on interval
: LEDs flash, buzzer sounds, and instrument vibrates based
: LEDs flash based on interval defined in BEEP INT if
: LEDs flash based on interval defined in BEEP INT if
: LEDs flash based on interval defined in BEEP INT if
(factory setting): No alerts to confirm instrument is still operating or
Description
BL TIME (pg.75) How long the back light stays on after the last button press.
Options: 0 - 255 seconds or OFF. The factory setting is 30 seconds.
KEY TONE (pg.75)
DISP SET (pg.76) OFF
ZERO SUP (pg.76)*
ZERO.FLWR (pg.76)**
DATE (pg.77) Set the instrument’s date and time.
PA SS W OR D (pg.77)
ROM/SUM (pg.78)
ON
(factory setting): Buzzer sounds when button is pressed.
OFF
: Buzzer does not sound when button is pressed.
: LIST, USER ID, and STN ID screens do not appear in Display Mode.
ON
(factory setting): LIST item appears in Display Mode. USER ID and STN ID screens
appear if ID DISP in Maintenance Mode is also set to ON.
(factory setting): Not intended for field adjustment. The suppression values are:
ON
Combustible Gas: 2% LEL O
: 0.5% volume
2
H
S: 0.3 ppm
2
CO: 2 ppm
ON
(factory setting): Not intended for field adjustment. Oxygen channel does not support
zero follower functionality.
ON
: User Mode is password-protected. Factory-set password is 0405.
OFF
(factory setting): User Mode is not password-protected.
View the firmware information for the GX-3R’s sensor board and main board.
START (pg.79) Press and release POWER MODE to begin the warmup sequence and enter Measuring
Mode.
GX-3R Operator’s Manual Chapter 5: User Mode and Calibration • 45
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Table 9: User Mode Menu Items
PASSWORD
set to
OFF PASSWORD
set to
ON
PASSWORD
M 7:49
0 0 0 0
BUMP
M 7:49
BUMP
M 7:49
M
User Mode Menu Item
* Only appears if ZSUP.DISP is set to ON in Maintenance Mode. ** Only appears if ZFLW.DISP is set to ON in Maintenance Mode.

Entering User Mode

WARNING: The GX-3R is not in operation as a gas detector while in User Mode.
1 . Take the GX-3R 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.
3 . The screen that appears will depend on the setting of User Mode’s PASSWORD item.
If PASSWO RD is set to OFF (factory setting), continue with Step 6. If PASSWO RD is set to ON, continue with Step 4.
Description
4 . If PASS W ORD has been set to ON in User Mode, a password screen appears. The first
digit is flashing.
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 menu item appears.
7 . at the top of the screen indicates that the GX-3R is in User Mode. 8 . Use AIR to move through the User Mode menu items.
46 • Chapter 5: User Mode and Calibration GX-3R Operator’s Manual
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Tips for Using User Mode

• To scroll from one menu 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 (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 menu 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 each target gas. The instrument does not need to be calibrated unless it does not pass the bump test.
To bump test the GX-3R, you will need:
• Known calibrating samples of the gases being detected.
Table 10: Calibration Concentration Limits
Channel
Combustible Gas 5% LEL 75% LEL
Oxygen 0.0% 18.0%
Hydrogen Sulfide 1.0 ppm 200.0 ppm
Carbon Monoxide 15 ppm 2,000 ppm
Min. Cal. Gas
Concentration
Max. Cal. Gas Concentration
• 0.25 LPM fixed flow regulator
• Non-absorbent tubing
• Calibration cup
1 . Confirm that the GX-3R’s calibration gas values match the concentrations listed on the
calibration gas cylinder(s) as described on pg.60.
2 . Confirm that your cylinder selections are appropriate as described on pg.62.
GX-3R Operator’s Manual Chapter 5: User Mode and Calibration • 47
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3 . Install the calibration cup onto the GX-3R. Use the label and imprinting to make sure
GX-3R
AIR
POWER
MODE
CO/H2SLELO
2
FRONT
Inlet
Figure 7: Calibration Cup Installation
BUMP
M 7:49
CYL A
M 7:49
50 25.0
CO ppm H2S ppm
50 12.0
CH4 %LEL O2 %
BUMP
M 7:49
50 25.0
CO ppm H2S ppm
50 12.0
CH4 %LEL O2 %
that the calibration cup gets installed in the correct orientation relative to the GX-3R. Be sure the calibration cup is pushed on all the way.
4 . Use the tubing to connect the regulator to the inlet of the calibration cup. 5 . While in User Mode, press AIR to scroll to BUMP.
6 . Press and release POWER MODE. The display shows the gases assigned to Cylinder A
and their assigned calibration values (see pg.60 if the calibration values do not match the calibration gas cylinder’s concentrations). 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(es) you want to bump test.
As shipped from the factory, combustible gas, O A. If a H
-compensated CO sensor is installed, H2 is assigned to Cylinder D but there is
2
, H2S, and CO are assigned to Cylinder
2
no reason to bump test the H2 response.
8 . Make sure the GX-3R has been turned on for at least 45 seconds before continuing.
48 • Chapter 5: User Mode and Calibration GX-3R Operator’s Manual
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9 . For toxic gas cylinders (like cylinders containing H2S), it is important to vent the
APPLY
M 29
0 0.0
CO ppm H2S ppm
0 20.9
CH4 %LEL O2 %
BUMP
M 29
0 0.0
CO ppm H2S ppm
0 20.9
CH4 %LEL O2 %
regulator while installing it onto the cylinder. Venting the regulator during installation helps prevent air from getting into the cylinder and degrading the gas. Open the regulator
by turning the knob counterclockwise and install it onto the cylinder. 10 . Press and release POWER MODE. 11 . The gas readings flash, the bottom of the screen alternates between “APPLY” and
“BUMP”, and the top of the screen counts down from the time set in BUMP
SET\SETTINGS\GAS TIME.
NOTE: To back out of the gas application screen without performing the bump test, press
and release AIR and POWER MODE together.
GX-3R Operator’s Manual Chapter 5: User Mode and Calibration • 49
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12 . At the end of the countdown, the instrument analyzes the results. Follow the flow chart
Figure 8: Bump Test Flow Chart
Bump test passed?
Y N
AUTO CAL On?
Multiple Cylinders
Calibration passed?
Y N Y N
Assigned?
(default is on)
Multiple Cylinders Assigned?
Y N
Y N
set to on? (default is on)
A D
F
B C E
G H
Y N Y N
Auto start after successful
bump
set to on? (default is on)
*NOTE: Auto start after successful bump/cal parameters set using Datalogging or SDM-3R PC Programs.
Auto start after successful
cal
to determine the bump test outcome.
50 • Chapter 5: User Mode and Calibration GX-3R Operator’s Manual
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Option A from Flow Chart Option B from Flow Chart Option C from Flow Chart
BUMP/CAL
M 7:49
P
CO ppm
P P
CH4 %LEL O2 %
AIR
BUMP/
M 7:49
47
CO ppm
47 11.9
CH4 %LEL O2 %
BUMP/CAL
M 7:49
P P
CO ppm H2S ppm
P P
CH4 %LEL O2 %
AIR
BUMP/
M 7:49
47 22.0
CO ppm H2S ppm
47 11.9
CH4 %LEL O2 %
BUMP/CAL
M 7:49
P P
CO ppm H2S ppm
P P
CH4 %LEL O2 %
AIR
BUMP/
M 7:49
47 22.0
CO ppm H2S ppm
47 11.9
CH4 %LEL O2 %
• Bump test passed
• Multiple cylinders assigned
1. The instrument indicates that all channels passed the bump test. Use AIR to scroll between the bump test results and the bump test gas readings.
2. Close the regulator.
3. Press and release POWER MODE to move to the BUMP CYL X screen for the next cylinder.
4. Unscrew the regulator from the first cylinder and screw it into the next cylinder.
5. Repeat Step 9 through Step 12.
6. After the last cylinder is bump tested, press and release POWER MODE to go to the START item in the BUMP menu.
7. Remove the calibration cup.
8. Press and release POWER MODE to enter Measuring Mode.
• Bump test passed
• One cylinder assigned
• Auto Start After Successful Bump set to ON (factory setting)
1. The instrument indicates that all
channels passed the bump test. Use AIR to scroll between the bump test results and the bump test gas readings.
2. Close the regulator.
3. Unscrew the regulator.
4. Remove the calibration cup.
5. Press and release POWER MODE to
enter Measuring Mode.
• Bump test passed
• One cylinder assigned
• Auto Start After Successful Bump set to OFF (factory setting is ON)
1. The instrument indicates that all
channels passed the bump test. Use AIR to scroll between the bump test results and the bump test gas readings.
2. Close the regulator.
3. Unscrew the regulator.
4. Remove the calibration cup.
5. Press and release POWER MODE to
return to the START item in the BUMP menu.
6. Press and release POWER MODE to
enter Measuring Mode.
GX-3R Operator’s Manual Chapter 5: User Mode and Calibration • 51
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Option D from Flow Chart Option E from Flow Chart Option F from Flow Chart
BUMP/CAL
M 7:49
P F
CO ppm H2S ppm
P P
CH4 %LEL O2 %
AIR
BUMP/
M 7:49
47 2.0
CO ppm H2S ppm
47 11.9
CH4 %LEL O2 %
AUTO CAL
M 59
2.0
H2S ppm
30
CH4 %LEL
BUMP/CAL
M 7:49
P F F
CO ppm H2S ppm
F P P
CH4 %LEL O2 %
BUMP/
M 7:49
47 2.0
CO ppm H2S ppm
30 11.9
CH4 %LEL O2 %
/CAL
M 7:49
2.5
H2S ppm
42
CH4 %LEL
AIR
AIR
AUTO CAL
M 59
30
CH4 %LEL
BUMP/CAL
M 7:49
P
CO ppm
F P P
CH4 %LEL O2 %
BUMP/
M 7:49
47
CO ppm
30 11.9
CH4 %LEL O2 %
/CAL
M 7:49
42
CH4 %LEL
AIR
AIR
•Bump test failed
• A-CAL set to OFF (factory setting is ON)
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 results and the readings.
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 item in the BUMP menu.
6. Use AIR to scroll to START and press
and release POWER MODE to enter Measuring Mode.
7. Calibrate the GX-3R as soon as
possible.
• 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\SETTINGS item in User Mode.
3. The instrument shows which channels passed or failed the bump test/ calibration. The LEDs flash and the buzzer sounds. Use AIR to scroll
between the results and the readings.
• Bump test failed
• A-CAL set to ON (factory setting)
• Calibration passed
• Multiple cylinders assigned
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\SETTINGS item in User Mode.
3. The instrument shows which channels passed or failed the bump test/ calibration. Use AIR to scroll between
the results and the readings.
52 • Chapter 5: User Mode and Calibration GX-3R Operator’s Manual
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 item 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. Press and release POWER MODE to move to the BUMP CYL X screen for the next cylinder.
6. Unscrew the regulator from the first cylinder and screw it into the next cylinder.
7. Repeat Step 9 through Step 12.
8. After the last cylinder is bump tested, press and release POWER MODE to go to the START item in the BUMP menu.
9. Remove the calibration cup.
10. Press and release POWER MODE to enter Measuring Mode.
Page 53
Option G from Flow Chart Option H from Flow Chart
AUTO CAL
M 59
2.0
H2S ppm
30
CH4 %LEL
BUMP/CAL
M 7:49
P F P
CO ppm H2S ppm
F P P
CH4 %LEL O2 %
BUMP/
M 7:49
47 12.0
CO ppm H2S ppm
30 11.9
CH4 %LEL O2 %
/CAL
M 7:49
20.5
H2S ppm
42
CH4 %LEL
AIR
AIR
AUTO CAL
M 59
2.0
H2S ppm
30
CH4 %LEL
BUMP/CAL
M 7:49
P F P
CO ppm H2S ppm
F P P
CH4 %LEL O2 %
BUMP/
M 7:49
47 12.0
CO ppm H2S ppm
30 11.9
CH4 %LEL O2 %
/CAL
M 7:49
20.5
H2S ppm
42
CH4 %LEL
AIR
AIR
•Bump test failed
• A-CAL set to ON (factory setting)
• Calibration passed
• One cylinder assigned
• Auto Start After Successful Cal set to ON (factory setting)
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\SETTINGS item in User Mode.
3. The instrument shows which channels
passed or failed 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 passed
• One cylinder assigned
• Auto Start After Successful Cal set to OFF (factory setting is ON)
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\SETTINGS item in User Mode.
3. The instrument shows which channels
passed or failed the bump test/ calibration. Use AIR to scroll between
the results and the readings.
GX-3R Operator’s Manual Chapter 5: User Mode and Calibration • 53
4. Close the regulator.
5. Unscrew the regulator.
6. Remove the calibration cup.
7. 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 START item in the BUMP menu.
8. Press and release POWER MODE to enter Measuring Mode.
Page 54

Performing a Calibration (GAS CAL)

GAS CAL
M 7:49

AIR CAL

M 7:49
AIR CAL
M 7:49
0 0.0
CO ppm H2S ppm
0 20.9
CH4 %LEL O2 %
HOLD AIR
M 7:49
Air CAL
RELEASE
M 7:49
Adj

Calibration Notes

• To fully calibrate the sensors, you must do a fresh air adjustment (AIR CAL) and a span adjustment (AUTO CAL).
• Bump test the instrument before each day’s use with a known concentration of each 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 H sensor is replaced.
AIR CAL
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.
-compensated CO sensor only needs to be set when the
2
3 . Press and release POWER MODE. The AIR CAL menu item appears.
4 . Press and release POWER MODE to enter the AIR CAL menu.
5 . Make sure the GX-3R has been turned on for at least 45 seconds before continuing. 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 GAS CAL menu.
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8 . If the fresh air adjustment fails, “FAIL AIR” displays. Press and release POWER MODE
GX-3R
AIR
POWER
MODE
CO/H2SLELO2
FRONT
Inlet
Figure 9: Calibration Cup Installation
to acknowledge the failure. See “Troubleshooting” on page 80.

Performing a Span Adjustment in AUTO CAL

Preparing for a Span Adjustment
To adjust the span on the GX-3R, you will need:
• Known concentrations of the gases being detected.
Table 11: Calibration Concentration Limits
Channel
Combustible Gas 5% LEL 75% LEL
Oxygen 0.0% 18.0%
Hydrogen Sulfide 1.0 ppm 200.0 ppm
Carbon Monoxide 15 ppm 2,000 ppm
Hydrogen (for H CO sensor); only needs to be
done when sensor is replaced
-compensated
2
Min. Cal.
Concentration
25 ppm 2,000 ppm
Max. Cal.
Concentration
• 0.25 LPM fixed flow regulator
• Non-absorbent tubing
• Calibration cup
1 . Confirm that the GX-3R’s calibration gas values match the concentrations listed on the
calibration gas cylinder(s) as described on pg.60. 2 . Confirm that your cylinder selections are appropriate as described on pg.62. 3 . Install the calibration cup onto the GX-3R. Use the label and imprinting to make sure
that the calibration cup gets installed in the correct orientation relative to the GX-3R. Be
sure the calibration cup is pushed on all the way.
4 . Use the tubing to connect the regulator to the inlet of the calibration cup.
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Performing a Span Adjustment
GAS CAL
M 7:49
AUTO CAL
M 7:49
CYL A
M 7:49
50 25.0
CO ppm H2S ppm
50 12.0
CH4 %LEL O2 %
AUTO CAL
M 7:49
50 25.0
CO ppm H2S ppm
50 12.0
CH4 %LEL O2 %
APPLY
M 7:49
0 0.0
CO ppm H2S ppm
0 20.9
CH4 %LEL O2 %
AUTO CAL
M 7:49
0 0.0
CO ppm H2S ppm
0 20.9
CH4 %LEL O2 %
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 AUTO CAL menu item.
4 . Press and release POWER MODE. The display shows the gases assigned to Cylinder A
and their assigned calibration values (see pg.60 if the calibration values do not match the
calibration gas cylinder’s concentrations). The bottom of the screen alternates between
“CYL A” and “AUTO CAL”.
5 . If necessary, use AIR to scroll to the Auto Cal screen for the gas(es) you want to
calibrate. As shipped from the factory, combustible gas, O2, H2S, and CO are assigned to
Cylinder A. If a H
-compensated CO sensor is installed, H2 is assigned to Cylinder D.
2
6 . Make sure the GX-3R has been turned on for at least 45 seconds before continuing. 7 . Press and release POWER MODE. 8 . The gas readings flash and the bottom of the screen alternates between “APPLY” and
“AUTO CAL”.
NOTE: 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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9 . For toxic gas cylinders (like cylinders containing H2S), it is important to vent the
Figure 10: Calibration Flow Chart
Y N
Multiple Cylinders
Y N
Assigned?
A
B C
Y N
Auto start after successful
cal
set to on? (default is on)
D
*NOTE: Auto start after successful cal parameter set using Datalogging or SDM-3R PC Programs.
Calibration passed?
regulator while installing it onto the cylinder. Venting the regulator during installation
helps prevent air from getting into the cylinder and degrading the gas. Open the regulator
by turning the knob counterclockwise and install it onto the cylinder. 10 . Allow the gas to flow for 1 minute. 11 . Press and release POWER MODE. 12 . Follow the flow chart to determine the calibration outcome.
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Option A from Flow Chart Option B from Flow Chart
AUTO CAL
M 7:49
PASS
AUTO CAL
M 7:49
50
CO ppm
51 11.9
CH4 %LEL O2 %
MAX SPAN
M 7:49
70
CO ppm
100 25.0
CH4 %LEL O2 %
LIMITED
M 7:49
GAS LIST
HC
AUTO CAL
M 7:49
PASS
AUTO CAL
M 7:49
50 25.2
CO ppm H2S ppm
51 11.9
CH4 %LEL O2 %
MAX SPAN
M 7:49
70 48.5
CO ppm H2S ppm
100 25.0
CH4 %LEL O2 %
LIMITED
M 7:49
GAS LIST
HC
• Calibration passed
• Multiple cylinders assigned
1. The instrument indicates that all channels passed the calibration.
2. The instrument shows the current gas readings.
3. If MAX SPAN is set to ON (default is OFF, see pg.112), the response reading’s maximum adjustment is displayed. A maximum span of 100% LEL on the combustible channel indicates that the reading could have been adjusted up to 100% LEL. 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. The maximum adjustment indicated for the oxygen channel is 25.0% volume.
• Calibration passed
• One cylinder assigned
• Auto Start After Successful Cal set to ON (factory setting)
1. The instrument indicates that all channels passed the calibration.
2. The instrument shows the current gas readings.
3. If MAX SPAN is set to ON (default is OFF, see pg.112), the response reading’s maximum adjustment is displayed. A maximum span of 100% LEL on the combustible channel indicates that the reading could have been adjusted up to 100% LEL. 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. The maximum adjustment indicated for the oxygen channel is 25.0% volume.
4. If the combustible gas sensor is nearing the end of its useful life, the reading conversions that can be made in Display Mode’s LIST item become limited. Press and release POWER MODE. See pg.36 for the limited conversion list. Replace the combustible sensor as soon as possible.
5. Close the regulator.
6. The instrument continues to the AUTO CAL CYL X screen.
7. Unscrew the regulator from the first cylinder and screw it into the next cylinder.
8. Press and release POWER MODE to start the next cylinder’s
4. If the combustible gas sensor is nearing the end of its useful life, the reading conversions that can be made in Display Mode’s LIST item become limited. Press and release POWER MODE. See pg.36 for the limited conversion list. Replace the combustible sensor as soon as possible.
5. Close the regulator.
6. Unscrew the regulator.
7. Remove the calibration cup.
8. The instrument automatically begins its warmup sequence and enters Measuring Mode.
calibration.
9. Repeat Step 9 through Step 12.
10. After the last cylinder is calibrated, the instrument continues to the START item in the AUTO CAL menu.
11. Remove the calibration cup.
12. Press and release POWER MODE to enter Measuring Mode.
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Option C from Flow Chart Option D from Flow Chart
AUTO CAL
M 7:49
PASS
AUTO CAL
M 7:49
50 25.2
CO ppm H2S ppm
51 11.9
CH4 %LEL O2 %
MAX SPAN
M 7:49
70 48.5
CO ppm H2S ppm
100 25.0
CH4 %LEL O2 %
LIMITED
M 7:49
GAS LIST
HC
AUTO CAL
M 7:49
50 25.2
CO ppm H2S ppm
FAIL 11.9
CH4 %LEL O2 %
• Calibration passed
• One cylinder assigned
• Auto Start After Successful Cal set to OFF (factory setting is
ON)
1. The instrument indicates that all channels passed the calibration.
2. The instrument shows the current gas readings.
3. If MAX SPAN is set to ON (default is OFF, see pg.112), the response reading’s maximum adjustment is displayed. A maximum span of 100% LEL on the combustible channel indicates that the reading could have been adjusted up to 100% LEL. If the maximum span value is close to the calibration gas value, the sensor should be replaced soon.
• Calibration failed
1. The instrument indicates which channels failed the calibration.
2. Close the regulator.
3. Unscrew the regulator.
4. Remove the calibration cup.
5. Press and release POWER MODE to return to the AUTO CAL CYL X screen in the AUTO CAL menu.
6. See “Troubleshooting” on page 80.
The maximum adjustment is either twice the calibration value or full scale, whichever is lower. The maximum adjustment indicated for the oxygen channel is 25.0% volume.
4. If the combustible gas sensor is nearing the end of its useful life, the reading conversions that can be made in Display Mode’s LIST item become limited. Press and release POWER MODE. See pg.36 for the limited conversion list. Replace the combustible sensor as soon as possible.
5. Close the regulator.
6. Unscrew the regulator.
7. Remove the calibration cup.
8. The instrument continues to the START item in the AUTO CAL menu.
9. Press and release POWER MODE to enter Measuring Mode.
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Setting the Calibration Values in CAL--P

GAS CAL
M 7:49
AUTO CAL
M 7:49
CAL--P
M 7:49
CAL--P
M 7:49
- - -
CH4 %LEL
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 AUTO CAL menu item.
4 . Press and release POWER MODE. The Auto Cal screen for gases assigned to Cylinder
A appears.
5 . Use AIR to scroll to CAL--P.
6 . Press and release POWER MODE. The combustible gas channel appears.
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7 . Use AIR to scroll to the channel whose calibration gas value you want to change.
CAL--P
M 7:49
- - -
CH4 %LEL
CAL--P
M 7:49
- - -
O2 %
CAL--P
M 7:49
- - -
H2S ppm
CAL--P
M 7:49
- - -
CO ppm
ESCAPE
M 7:49
AIR
AIR
AIR
AIR
AIR
CAL--P
M 7:49
50
CH4 %LEL
8 . Press and release POWER MODE. The calibration value begins to flash. In the example
below, the combustible gas channel is selected.
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 for that channel. Limits on the calibration gas value are shown in the table below.
Table 12: Calibration Concentration Limits
Channel
Combustible Gas 5% LEL 75% LEL
Oxygen 0.0% 18.0%
Hydrogen Sulfide 1.0 ppm 200.0 ppm
Carbon Monoxide 15 ppm 2,000 ppm
Min. Cal.
Concentration
Max. Cal.
Concentration
Hydrogen (for H CO sensor); only needs to be
done when sensor is replaced
-compensated
2
25 ppm 2,000 ppm
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10 . Press and release POWER MODE to save the change. The calibration gas value stops
GAS CAL
M 7:49
AUTO CAL
M 7:49
CYL SEL
M 7:49
flashing and the unit returns to the channel selection screen. 11 . Repeat Step 7 through Step 10 for any other channels that need to be changed. 12 . Use AIR to scroll to ESCAPE. 13 . Press and release POWER MODE. The instrument returns to the CAL--P 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 AUTO CAL menu
item in the GAS CAL Menu. 16 . See “Exiting the GAS CAL Menu” on page 64 to return to User Mode.

Making Cylinder Selections in CYL SEL

The CYL SEL menu item allows you to group channels together for calibration. As shipped from the factory, the standard 4 channels (combustible gas, O2, H2S, and CO) are assigned to
Cylinder A. As shipped from the factory, the H is assigned to Cylinder D. There are 5 cylinder assignments available: A, B, C, D, and E. To
calibrate each channel separately, assign each channel to a different cylinder (ie. Cylinder A: combustible gas, Cylinder B: O
, Cylinder C: H2S, Cylinder D: CO).
2
1 . While in User Mode, press AIR to scroll to GAS CAL.
response for the H2-compensated CO sensor
2
2 . Press and release POWER MODE. The AIR CAL menu item appears. 3 . Use AIR to scroll to the AUTO CAL menu item.
4 . Press and release POWER MODE. The Auto Cal screen for gases assigned to Cylinder
A displays. 5 . Use AIR to scroll to CYL SEL.
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6 . Press and release POWER MODE. The combustible gas channel displays.
CYL SEL
M 7:49
- - -
CH4 %LEL
CYL SEL
M 7:49
- - -
CH4 %LEL
CYL SEL
M 7:49
- - -
O2 %
CYL SEL
M 7:49
- - -
H2S ppm
CYL SEL
M 7:49
- - -
CO ppm
ESCAPE
M 7:49
AIR
AIR
AIR
AIR
CYL SEL
M 7:49
A
CH4 %LEL
7 . Use AIR to scroll to the channel whose cylinder assignment you want to change.
8 . Press and release POWER MODE. The current setting flashes. In the example below, the
combustible gas channel 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 channel selection screen. 11 . Repeat Step 7 through Step 10 for any other channels that need to be changed. 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.
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14 . Press AIR to scroll to ESCAPE.
CAL SET
M 7:49

CAL RMDR

M 7:49
CAL RMDR
M 7:49
15 . Press and release POWER MODE. The instrument returns to the AUTO CAL menu
item in the GAS CAL menu. 16 . See “Exiting the GAS CAL Menu” on page 64 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. The instrument returns to the GAS CAL menu item
in User Mode. 3 . See “Entering Measuring Mode (START)” on page 79 to enter Measuring Mode.

Setting Calibration Parameters (CAL SET)

The CAL SET menu item 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 menu item appears.
CAL RMDR
ON (factory setting): The GX-3R gives an indication at start up if it is due for calibration. The type of indication depends on the CAL EXPD setting (see pg.65).
: The GX-3R does not give an indication at start up if it is due for calibration.
OFF
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
menu item. 5 . See “Exiting the CAL SET Menu” on page 65 to return to User Mode.
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CAL INT

CAL INT
M 7:49

CAL EXPD

M 7:49
This setting defines the amount of time between calibrations. The time 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 menu
item. 5 . See “Exiting the CAL SET Menu” on page 65 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.
CONFIRM (factory setting): The GX-3R 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 perform a calibration.
CANT USE
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 GX-3R gives an indication at startup if calibration is past due. If desired, press POWER MODE to perform a calibration but it is not necessary to acknowledge the calibration due indication. The warm-up sequence will continue on its own.
1 . After entering the CAL SET menu, press AIR to scroll to CAL EXPD.
: The GX-3R gives an indication at start up if calibration is past due. Press and
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 EXPD
menu item. 5 . See “Exiting the CAL SET Menu” on page 65 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. The instrument returns to the CAL SET menu item
in User Mode. 3 . See “Entering Measuring Mode (START)” on page 79 to enter Measuring Mode.
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Setting Bump Test Parameters (BUMP SET)

BUMP SET
M 7:49

SETTINGS

M 7:49
SETTINGS
M 7:49
GAS TIME
M 7:49
The BUMP SET menu item has 5 items: SETTINGS, BUMP.RMDR, BUMP INT, BUMP.EXPD, and ESCAPE.
1 . While in User Mode, press AIR to scroll to BUMP SET.
2 . Press and release POWER MODE. The SETTINGS menu item appears.
SETTINGS
The SETTINGS menu item has 5 items: GAS TIME, CHECK, CAL TIME, AUTO CAL, and ESCAPE.
1 . After entering the BUMP SET menu, press AIR to scroll to SETTINGS.
2 . Press and release POWER MODE. The GAS TIME menu item appears.
GAS TIME
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 BUMP SET\SETTINGS 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 menu
item. 5 . See “Exiting the SETTINGS Menu” on page 68 to return to the BUMP SET menu.
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6 . See “Exiting the BUMP SET Menu” on page 69 to return to User Mode.
CHECK
M 7:49
CAL TIME
M 7:49
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 actual gas concentration and still be considered a passed bump test. If the bump test reading differs more, the bump test will fail. The available values are 10%, 20%, 30%, 40%, and 50% (factory setting).
1 . After entering the BUMP SET\SETTINGS 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 menu
item. 5 . See “Exiting the SETTINGS Menu” on page 68 to return to the BUMP SET menu. 6 . See “Exiting the BUMP SET Menu” on page 69 to return to User Mode.
CAL TIME
The CAL TIME is the total time the instrument is exposed to calibration gas when a bump test fails if AUTO CAL is set to ON. 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 GX-3R will only be exposed to gas for an additional 60 seconds. The available values are 90 seconds (factory setting), and 120 seconds.
1 . After entering the BUMP SET\SETTINGS 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
menu item. 5 . See “Exiting the SETTINGS Menu” on page 68 to return to the BUMP SET menu. 6 . See “Exiting the BUMP SET Menu” on page 69 to return to User Mode.
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AUTO CAL
AUTO CAL
M 7:49

BUMP.RMDR

M 7:49
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 BUMP SET\SETTINGS menu, press AIR to scroll to AUTO 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 AUTO CAL
menu item. 5 . See “Exiting the SETTINGS Menu” on page 68 to return to the BUMP SET menu. 6 . See “Exiting the BUMP SET Menu” on page 69 to return to User Mode.
Exiting the SETTINGS Menu
1 . While in the BUMP SET\SETTINGS menu, press AIR to scroll to ESCAPE. 2 . Press and release POWER MODE. The instrument returns to the SETTINGS menu item
of the BUMP SET menu.
BUMP.RMDR
ON: The GX-3R gives an indication at start up if it is due for bump testing. The type of indication depends on the BUMP.EXPD setting (see pg.69).
OFF (factory setting): The GX-3R 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 BUMP.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 BUMP.RMDR
menu item. 5 . See “Exiting the BUMP SET Menu” on page 69 to return to User Mode.
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BUMP INT

BUMP INT
M 7:49

BUMP.EXPD

M 7:49
This setting defines the amount of time between bump tests. The time 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 BUMP 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 BUMP INT menu
item. 5 . See “Exiting the BUMP SET Menu” on page 69 to return to User Mode.
BUMP.EXPD
This item defines what indication is given during start up when a bump test is due and
BUMP.RMDR is set to ON. CONFIRM
due. Press and release AIR to continue without bump testing or press and release POWER MODE to perform a bump test.
CANT USE
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
POWER MODE to perform a bump test but it is not necessary to acknowledge the bump test due indication. The warm-up sequence will continue on its own.
1 . After entering the BUMP SET menu, press AIR to scroll to BUMP.EXPD.
(factory setting): The GX-3R gives an indication at start up if a bump test is past
: The GX-3R gives an indication at start up if a bump test is past due. Press and
: The GX-3R gives an indication at startup if a bump test is past due. If desired, press
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 BUMP.EXPD
menu item. 5 . See “Exiting the BUMP SET Menu” on page 69 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. The instrument returns to the BUMP SET menu item
in User Mode. 3 . See “Entering Measuring Mode (START)” on page 79 to enter Measuring Mode.
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Alarm Settings (ALARM--PT)

ALARM--PT
M 7:49
ALARM--PT
M 7:49
- - -
CH4 %LEL
ALARM--PT
M 7:49
- - -
CH4 %LEL
ALARM--PT
M 7:49
- - -
O2 %
ALARM--PT
M 7:49
- - -
H2S ppm
ALARM--PT
M 7:49
- - -
CO ppm
DEF--ALMP
M 7:49
ESCAPE
M 7:49
AIR
AIR AIR
AIR
AIR
AIR
The ALARM--PT menu item has 3 items: ALARM--PT, DEF--ALMP, and ESCAPE. 1 . While in User Mode, press AIR to scroll to ALARM--PT.
2 . Press and release POWER MODE. The first channel displays.

Setting the Alarm Points

1 . After entering the Alarm Points menu item, press AIR to scroll through to the instrument
channel whose alarm points you want to change.
2 . Press and release POWER MODE.
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3 . The Warning setpoint for the channel flashes. In the example below, the CO channel is
WARNING
7:49
25
CO ppm
ALARM
7:49
50
CO ppm
ALARM H
7:49
1200
CO ppm
STEL
7:49
200
CO ppm
TWA
7:49
25
CO ppm
For all settings:
1) AIR to adjust
2) POWER MODE to save and
continue
selected.
4 . Use AIR to adjust the Warning setpoint. Alarm setpoint limitations are shown below.
5 . Press and release POWER MODE to save the setting. 6 . Repeat Step 4 and Step 5 for the Alarm, Alarm H, STEL (CO and H
(CO and H2S only) settings.
7 . The instrument returns to the channel selection screen. 8 . Repeat Step 1 - Step 7 to change the alarm points for other channels. 9 . See “ESCAPE” on page 72 to return to User Mode.
Channel Alarm Point Limitations
Combustible Gas
O
2
H
S
2
CO
5% LEL WARNING ALARM ALARM H 60% LEL
•0.0% ALARM WARNING 21.8%
•20.0% ALARM H 40.0%
1.0 ppm WARNING ALARM ALARM H 200.0 ppm
15 ppm WARNING ALARM ALARM H 2000 ppm
S only) and TWA
2
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Defaulting the Alarm Points

DEF--ALMP
M 7:49
LUNCH
M 7:49
Defaulting the alarm points defaults them back to factory settings as outlined in Table on page 8 or to the settings saved in the SAVE-AP menu item in Gas Select Mode if you have performed a SAVE-AP operation.
1 . After entering the Alarm Points menu item, press AIR to scroll to DEF-ALMP.
2 . Press POWER MODE to enter the DEF-ALMP menu item. 3 . Press POWER MODE to perform an alarm default. Press AIR to return to the DEF-
ALMP menu item. 4 . The instrument asks if you’re sure you want to default the alarm points. Press POWER
MODE to default the alarm points. Press AIR to return to the DEF-ALMP menu item. 5 . See “ESCAPE” on page 72 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. The instrument returns to the ALARM--PT menu
item. 3 . See “Entering Measuring Mode (START)” on page 79 to enter Measuring Mode.

Updating the Lunch Break Setting (LUNCH)

OFF (factory setting): The GX-3R 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 GX-3R 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 menu
item. 5 . See “Entering Measuring Mode (START)” on page 79 to enter Measuring Mode.
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Setting the Confirmation Beep and
BEEP
M 7:49

BEEP SEL

M 7:49
Non-Compliance Indicator (BEEP)
The BEEP menu item 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 menu 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 GX-3R does not provide a confirmation alert or non-compliance
indicator.
LED
: The GX-3R’s LEDs double flash as often as defined by the BEEP INT parameter to
verify that the instrument is operating. BUZZER: The GX-3R’s buzzer double beeps as often as defined by the BEEP INT
parameter to verify that the instrument is operating. LED+BUZZ: The GX-3R’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. BUMP/CAL: If a bump test or a calibration is due and if BUMP.EXPD or CAL EXPD is set
to CONFIRM or NONE, the GX-3R’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.
ALM ALRT
defined by the BEEP INT parameter to indicate a non-compliance. Once a successful bump test or calibration is done, the LEDs stop flashing.
NOTE: Depending on the Need to get Bump Log setting (only accessed via SDM-3R
B/C/ALM: The LEDs double flash to indicate a non-compliance if any of the following
happens.
a. BUMP.EXPD is set to CONFIRM or NONE and a bump test is due (cleared by
: If the instrument goes into any gas alarm, the LEDs double flash as often as
program), a data download may also be needed to clear the non-compliance.
successful bump test).
b. CAL EXPD is set to CONFIRM or NONE and a calibration is due (cleared by
successful calibration).
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c. The instrument goes into any gas alarm (cleared by successful bump test or
BEEP SEL
M 7:49

BEEP INT

M 7:49
calibration).
NOTE: Depending on the Need to get Bump Log setting (only accessed via SDM-3R
program), a data download may also be needed to clear the gas alarm non­compliance.
1 . While in the BEEP menu, press AIR to scroll to BEEP SEL.
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 menu
item. 5 . See “ESCAPE” on page 74 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. 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 menu
item. 5 . See “ESCAPE” on page 74 to return to User Mode.

ESCAPE

1 . While in the BEEP menu, press AIR to scroll to ESCAPE. 2 . Press and release POWER MODE. The instrument return to the BEEP menu item. 3 . See “Entering Measuring Mode (START)” on page 79 to enter Measuring Mode.
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Updating the Backlight Time (BL TIME)

BL TIME
M 7:49
KEY TONE
M 7:49
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 menu
item. 5 . See “Entering Measuring Mode (START)” on page 79 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
menu item. 5 . See “Entering Measuring Mode (START)” on page 79 to enter Measuring Mode.
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Display Mode Items (DISP SET)

DISP SET
M 7:49
OFF: LIST, USER ID, and STN ID items do not appear in Display Mode. ON
(factory setting): LIST item appears in Display Mode. USER ID and STATION 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 menu
item.
5 . See “Entering Measuring Mode (START)” on page 79 to enter Measuring Mode.

Zero Suppression (ZERO SUP)

This menu item only appears if ZSUP.DISP is set to ON in Maintenance Mode (factory setting is OFF).
The ZERO SUP setting is not intended for field adjustment. The default setting for each sensor is ON.
Sensor
Combustible Gas 2% LEL
O
H
2
CO 2 ppm

Zero Follower (ZERO.FLWR)

This menu item only appears if ZFLW.DISP is set to ON in Maintenance Mode (factory setting is OFF).
The ZERO.FLWR setting is not intended for field adjustment. The default setting is ON. The oxygen channel does not support zero follower functionality.
Zero Suppression
Va lu e
2
S 0.3 ppm
0.5% volume
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Setting the Date/Time (DATE)

DATE
M 7:49
M 7:49
7:49
18 - 12.20
PASSWORD
M 7:49
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 menu item.
6 . See “Entering Measuring Mode (START)” on page 79 to enter Measuring Mode.

Turning the Password On/Off (PASSWORD)

ON: The GX-3R prompts you for a password when you enter User Mode. The factory-set password is 0405 but it can be changed as desired.
OFF (factory setting): No password is required to enter User Mode. 1 . While in User Mode, press AIR to scroll to PASSW OR D.
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 PASSWOR D item in User Mode.
If you selected ON, continue with Step 5.
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5 . Press and release POWER MODE. The Set Password Screen appears. The current
PASSWORD
M 7:49
0 4 0 5
ROM / SUM
M 7:49
MAIN ROM
M 7:49
2E86
35709
SENS. ROM
M 7:49
C1E3
35707
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 you return to the PASS WO RD item in User Mode.
9 . See “Entering Measuring Mode (START)” on page 79 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 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 menu item in User Mode. 4 . See “Entering Measuring Mode (START)” on page 79 to enter Measuring Mode.
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Entering Measuring Mode (START)

START
M 7:49
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 GX-3R. It also includes procedures for instrument cleaning, recharging the batteries, and replacing various consumable parts.
WARNING: RKI Instruments, Inc. recommends that service, calibration, and repair of
RKI Instruments be performed by personnel properly trained for this work. Replacing sensors and other parts with original equipment does not affect the intrinsic safety of the instrument.

Troubleshooting

The troubleshooting table describes error messages, symptoms, probable causes, and recommended action for problems you may encounter with the GX-3R.
Table 13: Troubleshooting the GX-3R
Symptoms Probable Causes Recommended Action
• The LCD is blank. • The unit may have been turned off.
• The batteries may need to be recharged.
• The LCD shows abnormally high or low readings but other gas detection instruments do not.
• The filters may need to be replaced.
• The GX-3R may need to be recalibrated.
• The sensor for the affected channel(s) may need replacement.
1. To turn on the unit, press and briefly hold POWER MODE.
2. If the unit does not turn on, recharge the batteries.
3. If the difficulties continue, contact RKI Instruments, Inc. for further instruction.
1. Replace the filters.
2. Recalibrate the unit.
3. If the difficulties continue, replace the sensor for the affected channel(s) and calibrate the affected channel(s).
4. If the difficulties continue, contact RKI Instruments, Inc. for further instruction.
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Table 13: Troubleshooting the GX-3R
Symptoms Probable Causes Recommended Action
• Calibration fails. • The calibration values may not match the cylinder gas concentrations.
• The charcoal filter or charcoal half of the dual filter is saturated causing an elevated CO reading.
• The sample gas is not reaching the sensors because of a bad connection.
• The calibration cylinder may be out of gas or is outdated.
• The sensor for the affected channel(s) may need replacement.
• Heart symbol at the top of the screen becomes steadily on or disappears
• Charge LED alternates between green and orange
• A microprocessor error has occurred.
• Charging environment is outside the allowed 0 - 40°C charging temperature range.
1. Make sure the GX-3R has been properly set up for calibration.
2. Change the charcoal filter or the dual filter.
3. Check all calibration tubing for leaks or for any bad connections.
4. Verify that the calibration cylinder contains an adequate supply of fresh test sample.
5. If the fail condition continues, replace the sensor(s).
6. If the difficulties continue, contact RKI Instruments, Inc. for further instruction.
• Contact RKI Instruments, Inc. for further
instruction.
• Move the charger to a location that is
within the allowed 0 - 40°C charging temperature range.

Instrument Cleaning

Clean the GX-3R with a cloth dampened with water if it becomes excessively dirty. Do not use alcohol or other cleaning solvents.

Recharging the Batteries

WARNING: To prevent ignition of a hazardous atmosphere, batteries must only be
charged in an area known to be nonhazardous. Charge only with RKI charger p/n 49-0133 or 49-0134. Use of other chargers will void the warranty.
AVERTISSEMENT:Pour éviter l’inflammation d’une atmosphère dangereuse, les batteries
doivent uniquement être modifiés ou facturés dans une zone connue comme non dangereuse. Chargez uniquement avec le chargeur RKI réf. 49-0133 ou 49-0134. L'utilisation d'autres chargeurs annulera la garantie.
Recharge the batteries when the battery icon indicates that the unit is in low battery warning. When in low battery warning, the lowest battery level indication bar disappears and the battery icon flashes.
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1 . Make sure the GX-3R is off.
Figure 11: Connecting the Charging Cable
OR
Figure 12: Removing the Charging Cable
OR
2 . Plug the AC adapter into an electrical outlet. 3 . Plug the charging jack straight into the GX-3R’s charging socket from the top. When
properly connected, a green LED turns on at the top of the GX-3R.
4 . The LED at the top of the GX-3R turns orange while charging. When a full charge has
been reached, approximately 3 hours, the LED turns green.
5 . Pull the charging jack straight out of the GX-3R’s charging socket.
6 . Turn on the GX-3R and confirm that it starts up.
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Replacing the Buzzer Cover

Figure 13: Buzzer Cover Replacement
The buzzer cover may need to be replaced if it becomes saturated or clogged with particles. 1 . Remove the rubber boot from the GX-3R. 2 . Peel off the old buzzer cover located between the AIR and POWER MODE buttons. 3 . If necessary, clean any remaining residue from the case. 4 . Peel the backing off of the new buzzer cover. 5 . Install the new buzzer cover between the AIR and POWER MODE buttons as shown
below.
6 . Reinstall the rubber boot.

Replacing the Sensor Filters

CAUTION: The buzzer cover, sensors, and filters are the only user-serviceable parts in the
GX-3R. Do not replace or modify any other part.
Combustible Gas Sensor Filter darken over time, its color is not indicative of remaining filter life. The H2S filter disk can absorb H
S for 33 ppm hours and should be replaced after that much exposure. With this
2
many ppm hours of absorption, the H2S filter disk should be replaced after 80 minutes of exposure to 25 ppm H
S. This equates to replacing the H2S filter disk after 40 2-minute
2
calibrations with a cylinder containing 25 ppm H environment, the H2S filter disk will have to be replaced more frequently.
Dual CO/H
S Sensor Filter: The dual CO/H2S sensor has a half black/half white filter
2
installed over it. The filter should be replaced if you notice either 1) unexplained CO readings or 2) For users with a 1 ppm H
unexplained H2S readings, the filter appears dirty, or every 6 months (whichever is sooner).
CO-Only Sensor Filter: A black charcoal filter is installed over CO-only sensors. The filter should be replaced if you notice unexplained CO readings.
: The H2S filter disk is dark red in color and although it may
S alarm setpoint: a drift on the H2S channel’s zero reading,
2
S. If H2S exists in the monitoring
2
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H2S-Only Sensor Filter: A white humidity filter is installed over H2S-only sensors. The filter absorbs humidity in the sampling environment to prevent unstable readings around 0 ppm
H
S. For users with a 1 ppm H2S alarm setpoint, the filter should be replaced if you notice: a
2
drift on the H every 6 months (whichever is sooner). For users with a 2 ppm or higher H
S channel’s zero reading, unexplained H2S readings, the filter appears dirty, or
2
S alarm setpoint,
2
the filter does not necessarily ever need to be replaced. 1 . Verify that the GX-3R is off. 2 . Turn the GX-3R upside down. 3 . Use a small Phillips screwdriver to unscrew the two screws holding the bottom cover to
the rest of the GX-3R’s case. Only unscrew them until the heads are flush with the edge of the bottom cover.
4 . Using a small flat blade screwdriver, gently pry each side of the bottom cover away from
the rest of the GX-3R’s case. 5 . Remove the bottom cover from the rest of the GX-3R’s case. 6 . Remove the filter gasket/sensor retainer assembly. 7 . Remove the filter gasket/ hydrophobic dust filter assembly. 8 . Gently pry out the filter you want to replace. 9 . Install the new filters.
a. Dark red H
S scrubber disk for combustible gas sensor: The brown side of the filter
2
case should face toward the GX-3R.
b. Black and white combo filter for CO/H
S dual sensor: The red side of the filter case
2
should face toward the GX-3R. The black filter material should face the edge of the GX-3R while the white filter material should face the H
S scrubber disk.
2
c. Black filter for CO-only sensor: The red side of the filter case should face toward the
GX-3R.
d. White filter for H
S-only sensor: The white side of the filter case should face toward
2
the GX-3R.
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10 . Reinstall the filter gasket/hydrophobic dust filter assembly onto the sensor retainer. The
Figure 14: Replacing the Sensor Filters
White Filter Material
Toxic Sensor Filters
White
Filter
Material
For CO-only
sensor
For dual
CO/H2S sensor
For H2S-only
sensor
Black Filter Material
NOTE: All filtersinstalledblack-side-up.
Black Filter Material
Side View
Sensor Retainer
Toxic Sensor F il ter, See Table
Filter Gasket/Hydrophobic Dust Filter Assembly, gasket tabs on oppositeside of thisview
Bottom Cover
AIR
POWER
MODE
CO/H2S LEL O
2
GX-3R
LEL
Sensor
Filter
Top View
gasket tabs face down. 11 . Reattach the bottom cover to the GX-3R. Push it onto the GX-3R until it snaps into
place. 12 . Reinstall the two screws that were loosened in Step 3. 13 . Perform a bump test as described on pg.47 to confirm good operation.

Replacing the Hydrophobic Dust Filter

Some GX-3Rs have a hydrophobic dust filter that is not attached to the filter gasket. When replacing the hydrophobic dust filter on one of these GX-3Rs, remove the filter and and replace it with a filter gasket/hydrophobic dust filter assembly.
1 . Verify that the GX-3R is off.
the gasket
2 . Turn the GX-3R upside down. 3 . Use a small Phillips screwdriver to unscrew the two screws holding the bottom cover to
the rest of the GX-3R’s case. Only unscrew them until the heads are flush with the edge
of the bottom cover. 4 . Using a small flat blade screwdriver, gently pry each side of the bottom cover away from
the rest of the GX-3R’s case. 5 . Remove the bottom cover from the rest of the GX-3R’s case. The filter gasket/sensor
retainer assembly may come out. 6 . Remove the filter gasket/hydrophobic dust filter assembly.
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7 . Install the new filter gasket/hydrophobic dust filter assembly with the gasket tabs facing
Figure 15: Replacing the Hydrophobic Dust Filter
Filter Gasket/Hydrophobic Dust Filter Assembly, gasket tabs on oppositeside of this view
Sensor Retainer
Bottom Cover
CO/H2S LEL O
2
POWER
MODE
GX-3R
AIR
Side View Top Vie w
down.
8 . Reattach the bottom cover to the GX-3R. Push it onto the GX-3R until it snaps into
place. 9 . Reinstall the two screws that were loosened in Step 3.

Replacing a Sensor

CAUTION: The CO and H2S sensors contain an electrolyte solution. If contact with the
electrolyte occurs, wash the area immediately.
CAUTION: The buzzer cover, sensors, and filters are the only user-serviceable parts in the
GX-3R. Do not replace or modify any other part.
1 . Verify that the GX-3R is off. 2 . Turn the GX-3R upside down. 3 . Use a small Phillips screwdriver to unscrew the two screws holding the bottom cover to
the rest of the GX-3R’s case. Only unscrew them until the heads are flush with the edge
of the bottom cover. 4 . Using a small flat blade screwdriver, gently pry each side of the bottom cover away from
the rest of the GX-3R’s case. 5 . Remove the filter gasket/sensor retainer assembly from the GX-3R. The sensors will be
exposed. 6 . Locate the sensor you want to replace and remove it from its socket.
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7 . Carefully insert the replacement sensor in the correct socket. Be sure that the new sensor
Figure 16: Replacing a Sensor
White Filter Material
H
2
S
C
O
White
Filter
Material
Blac k Filter Material
Sensor Retainer
LEL
Sensor
Filter
O
2
AIR
GX-3R
POWER
MODE
CO/H2S LEL O
2
Bottom Cover
NOTE: Allfilte rs install ed black -s ide-up.
Blac k Filter Material
To xic Sensor
Co mbustible Gas Sensor
Toxic Sensor Filters
For d ual
CO/ H2S sensor
For H 2S-only
sensor
For C O-only
sensor
Toxic S ensor Filter, See Table
Filter Gasket/Hydrophobic Dust Filter Assembly, gasket tabs on oppos ite si de of this view
Side View
Top View
Oxygen Sensor
is installed in the same position as the old sensor and that it is aligned correctly. The
toxic and oxygen sensors have slots to orient the sensor. The combustible gas sensor has
tabs to orient the sensor. Do not force a sensor into its slot.
8 . If your instrument has a factory installed dummy sensor, ensure that it is still installed
correctly. Make sure that the flat side is facing away from the GX-3R. 9 . Reinstall the filter gasket/sensor retainer assembly. The black and white filter goes over
the CO/H
S sensor with the black half of the filter facing the edge of the GX-3R. Be sure
2
the filter gasket/sensor retainer is oriented correctly. 10 . If the filter gasket/hydrophobic dust filter assembly came out, reinstall it with the gasket
tabs facing down. 11 . Reattach the bottom cover to the GX-3R. Push it onto the GX-3R until it snaps into
place. 12 . Reinstall the two screws that were loosened in Step 3. 13 . Calibrate the new sensors as described on pg.54. If a new H
was installed, you need to calibrate with CO and
set the H2 response.
-compensated CO sensor
2
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Replacing the Battery Board

Figure 17: Removing Case Screws
Figure 18: Removing Battery Board Screws
Replace the battery board when the GX-3R doesn’t hold a charge anymore. 1 . Verify that the GX-3R is off. 2 . Remove the rubber boot, if installed. 3 . Place the GX-3R LCD-side-down. 4 . Unscrew the 4 screws that hold the two case halves together. The alligator or belt clip
does not need to be removed.
5 . Separate the two case halves. You may need to pry them apart. 6 . The rear half of the case has the battery board. 7 . Unscrew the 3 screws that hold the battery board.
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8 . Gently remove the battery board. A black rectangular gasket may come out with the
Black Gasket
Battery Board
Rear Case
Figure 19: Removing the Battery Board
Figure 20: Reinstalling the Battery Board
Battery BoardRear Case
Top View
Side View
Black Gasket
battery board.
9 . Place the black rectangular gasket flat in the rear case. 10 . Place the new battery board battery-side-down in the rear case. The case has protrusions
that fit in holes on the battery board.
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11 . Secure the battery board using the screws removed in Step 7.
Figure 21: Reinstalling Battery Board Screws
Gasket, flat-side-up
Figure 22: Reinstalling Battery Board Screws
Figure 23: Removing Case Screws
12 . Be sure the gasket along the edge of the rear case is seated correctly. The flat side of the
gasket faces away from the case.
13 . Reinstall the rear case to the front case using the screws removed in Step 4.
14 . Reinstall the rubber boot, if being used. 15 . Turn on the GX-3R. 16 . If the instruments goes into a clock failure, set the date/time as described on pg.77.
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Chapter 7: Storage and Disposal

Storage

• Store away from direct sunlight
• Store in a location with normal temperature and humidity
• Store in a location free of gases, solvents, and vapors
• Store away from dust and dirt
• Discharge the battery to 1 bar in the battery icon to help prolong battery life and prevent
battery deterioration
• The GX-3R draws a small amount of power even while it is shut off. A GX-3R with a full
battery can be stored for 3 years without losing power. A GX-3R with a battery in low battery alarm can be stored for about 3 months without losing power. If a GX-3R completely loses power during storage, the date/time must be reset as described on pg.77.

Disposal

• Remove the batteries
• Dispose in accordance with local regulations
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Chapter 8: General Parts List

Table 14 lists part numbers for the GX-3R’s replacement parts and accessories.
Table 14: General Parts List
Part Number Description
06-1248RK-03 Calibration kit tubing, 3 foot length
10-1086 Screw with flat and lock washers, for alligator clip
10-1087 Screw, for bottom cover and for battery pack
13-0112RK Wrist strap
13-0124 Alligator clip with 3 installation screws
13-0125 Belt clip with 3 installation screws
20-0332 Rubber boot, black
20-0333 Leather case
20-0334 Heat-resistant case
21-1950 Screen protector
21-1962 Bottom cover
21-1963 Sensor retainer
33-0183 Filter gasket/hydrophobic dust filter assembly, 1 set (to replace hydrophobic dust filters
that are separate from the filter gasket and ter assemblies)
33-0183-10 Filter gasket/hydrophobic dust filter assembly, 10 sets (to replace hydrophobic dust fil-
ters that are separate from the filter gasket and filter assemblies)
33-0553 Buzzer cover
33-7130 Charcoal filter/humidity filter disk (black and white), for dual CO/H
33-7131 H
33-7132 Charcoal filter disk (black), for CO and H
33-7133 Humidity filter (white), for H
47-1019 Charging cable for multi-unit charger, 2 feet
47-5084RK USB/IrDA adapter module, no USB cable (for all premier portables)
47-5084RK-01 USB/IrDA adapter module, with USB cable (for all premier portables)
S scrubber disk (dark red), for combustible gas sensor, 5 pack
2
S sensor, 5 pack
2
to replace filter gasket/hydrophobic dust fil-
to replace filter gasket/hydrophobic dust
S sensor, 5 pack
2
-compensated CO sensors, 5 pack
2
47-5085RK USB A to USB mini cable, 6 feet, for 47-5084RK
47-5102 5 47-1019 charging cables with connector bar, no AC adapter
49-0133 Single-unit AC adapter, with 4 foot cable
49-0134 Multi-unit AC adapter, with 2 foot cables
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Table 14: General Parts List (cont.)
Part Number Description
49-2021 Single-unit DC adapter, with 4 foot cable
57-2098 Replacement Li-ion battery with board
65-7004 Dummy sensor
71-0477 Operator’s Manual, GX-3R (this document)
71-0491 Operator’s Manual, GX-3R Datalogging Program
81-0000RK-51 Calibration cylinder, 200 ppm H
81-0090RK-01 Calibration cylinder, 3-gas (CH
81-0090RK-03 Calibration cylinder, 3-gas (CH
81-0154RK-02 Calibration cylinder, 4-gas (CH
81-0154RK-04 Calibration cylinder, 4-gas (CH
in air, 34 liter steel
2
/CO), 34 liter steel
4/O2
/CO), 103 liter
4/O2
/ H2S/CO), 58 liter
4/O2
/ H2S/CO), 34 liter aluminum
4/O2
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)
81-1161 Aspirator assembly: Sample cup, aspirator bulb, 10 foot hose, and probe
81-1192 Calibration cup/sample cup for aspirator assembly
81-GX3RCO Calibration kit: 103 liter 3-gas (CH
/CO) cylinder, 0.25 LPM regulator, calibration
4/O2
tubing, and case
81-GX3RCO-LV Calibration kit: 34 liter steel 3-gas (CH
/ CO) cylinder, 0.25 LPM regulator,
4/O2
calibration tubing, and case
81-GX3RHSCO Calibration kit: 58 liter 4-gas (CH
/ H2S/CO) cylinder, 0.25 LPM regulator,
4/O2
calibration tubing, and case
81-GX3RHSCO-LV Calibration kit: 34 liter aluminum 4-gas (CH
/ H2S/CO) cylinder, 0.25 LPM
4/O2
regulator, calibration tubing, and case
81-GX3RHSCO-116 Calibration kit: 116 liter aluminum 4-gas (CH
/ H2S/CO), 0.25 LPM regulator,
4/O2
calibration tubing, and case
ESR-A13i-H2S Hydrogen sulfide (H
S) sensor
2
ESR-A13P-CO Carbon monoxide (CO) sensor
ESR-A1CP-CO-H Hydrogen-compensated carbon monoxide (CO) sensor
ESR-A1DP-COHS Dual carbon monoxide (CO) and hydrogen sulfide (H
S) sensor
2
ESR-X13P-OXY Oxygen sensor
NCR-6309 Combustible gas sensor, catalytic
GX-3R Operator’s Manual Chapter 8: General Parts List • 93
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Appendix A: Maintenance Mode

Overview

This appendix describes the GX-3R in Maintenance Mode. The GX-3R 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 15 below.
Table 15: Maintenance Mode Menu Items
Maintenance
Mode
Menu Item
GAS CAL (pg.97) Perform an air adjust, perform a span adjustment, change the calibration values, set the
cylinder group.
AIR CAL Perform a fresh air adjustment.
AUTO CAL Perform a span adjustment, set the calibration gas concentration, and set
the cylinder for each gas.
Description
AUTO CAL CYL X
START Begin the warmup sequence and enter Measuring Mode.
CAL-P Set the calibration concentration for each gas.
CYL SEL Assign a cylinder (A-E) to each gas (all 4 gases set to
ESCAPE Return to the AUTO CAL menu item.
ESCAPE Return to the GAS CAL menu item.
GAS TEST (pg.97)
SEN DATE (pg.99)
BUMP (pg.100) Perform a bump test.
Apply gas to test sensor response and observe alarm indications without an alarm event being recorded.
View the replacement date for each sensor and the battery and/or set the replacement date for each sensor or the battery to the current date.
BUMP CYL X
START Begin the warmup sequence and enter Measuring Mode.
Perform a bump test on the gases selected for Cylinder X (A-E cylinders available)
Perform an automatic span adjustment on the gases selected for Cylinder X (A-E cylinders available).
Cylinder A is the default). For single cal operation, you would assign each gas its own cylinder.
ESCAPE Return to the BUMP menu item.
LATCHING (pg.101)
ON
(factory setting): The GX-3R remains in alarm until the alarm condition passes and
POWER MODE is pressed.
OFF
: The GX-3R automatically resets an alarm when the alarm condition passes.
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Maintenance
Mode
Menu Item
Table 15: Maintenance Mode Menu Items
Description
DEM ZERO (pg.101)
AUTOZERO (pg.102)
ID DISP (pg.102) ON
ZERO SUP (pg.103)
ZERO.FLWR (pg.103)
ZSUP.DISP (pg.103)
ON (factory setting): You can manually perform a fresh air adjust in Measuring Mode by pressing AIR.
OFF
AIR.
ON
startup sequence.
OFF
ment at the end of the startup sequence.
Display Mode if DISP.SET in User Mode is also set to ON.
OFF
IDs cannot be changed in Display Mode.
ON
Combustible Gas: 2% LEL O
H
CO: 2 ppm
ON
zero follower functionality.
ON OFF
(Zero suppression menu item is always available in Maintenance Mode)
: You cannot manually perform a fresh air adjust in Measuring Mode by pressing
: The GX-3R asks if you want to perform a fresh air adjustment at the end of the
(factory setting): The GX-3R does not ask if you want to perform a fresh air adjust-
: User ID and Station ID screens appear in startup sequence. IDs can be changed in
(factory setting): User ID and Station ID screens do not appear in startup sequence.
(factory setting): Not intended for field adjustment. The suppression values are:
: 0.5% volume
2
S: 0.3 ppm
2
(factory setting): Not intended for field adjustment. Oxygen channel does not support
(factory setting): Zero suppression menu item appears in User Mode.
: Zero suppression menu item does not appear in User Mode.
ZFLW.DISP (pg.103)
DATE (pg.103) Set the current date and time.
PA SS W OR D (pg.104)
ROM/SUM (pg.105)
M.DEFAULT (pg.105)
START (pg.106) Press and release POWER MODE to begin the warmup sequence and enter Measuring
ON
: Zero follower menu item appears in User Mode.
OFF
(factory setting): Zero follower menu item does not appear in User Mode.
(Zero follower menu item is always available in Maintenance Mode)
(factory setting): Maintenance Mode is password-protected. Factory-set password is
ON
8102. OFF
: Maintenance Mode is not password-protected.
View the firmware information for the GX-3R’s sensor board, main board, and gas list.
Set all parameters back to their RKI factory settings.
Mode.
GX-3R Operator’s Manual Appendix A: Maintenance Mode • 95
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Entering Maintenance Mode

PASSWORD
set to
OFF PASSWORD
set to
ON
PASSWORD
M 7:49
0 0 0 0
BUMP
M 7:49
GAS CAL
M 7:49
M
WARNING: The GX-3R is not in operation as a gas detector while in Maintenance
Mode.
1 . Take the GX-3R 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 PASSWORD
item.
If PASSWO RD is set to OFF, continue with Step 8.
If PASSWO RD is set to ON (factory setting), continue with Step 5.
5 . If PASS WO RD is set to ON in Maintenance Mode, a password screen appears. The first
digit flashes. The factory-set password is 8102 but it can be changed as desired. 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 menu item displays.
9 . at the top of the screen indicates that the GX-3R is in Maintenance Mode. 10 . Use AIR to move through the Maintenance Mode menu items.
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Tips for Using Maintenance Mode

• To scroll from one menu 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
(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 menu item without saving a change, press and hold AIR and POWER
MODE for a few seconds.

Performing a Calibration (GAS CAL)

See “Performing a Calibration (GAS CAL)” on page 54 for a description of the GAS CAL menu item.

Performing a Gas Test (GAS TEST)

The GAS TEST menu 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 will sound in the event of a real gas alarm condition while in Measuring Mode.
Preparing for a Gas Test
To perform a gas test on the GX-3R, you will need:
• A calibration cylinder. The concentrations should be above the alarm condition you want to check. Standard alarm points are listed on pg.8.
• 0.25 LPM fixed flow regulator
• Non-absorbent tubing
• Calibration cup
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1 . Install the calibration cup onto the GX-3R. Use the label and imprinting to make sure
GX-3R
AIR
POWER
MODE
CO/H2SLELO
2
FRONT
Inlet
Figure 24: Calibration Cup Installation
GAS TEST
M 7:49
GAS TEST
M 7:49
0 0.0
CO ppm H2S ppm
0 20.9
CH4 %LEL O2 %
BUZZ OFF
M 7:49
0 0.0
CO ppm H2S ppm
0 20.9
CH4 %LEL O2 %
that the calibration cup gets installed in the correct orientation relative to the GX-3R. Be sure the calibration cup is pushed on all the way.
2 . 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 readings display. The bottom of the
LCD alternates between “GAS TEST” and “BUZZ OFF”.
S), it is important to vent the
2
for the buzzer. There is no buzzer
3 . For toxic gas cylinders (like cylinders containing H
regulator while installing it onto the cylinder. Venting the regulator during installation helps prevent air from getting into the cylinder and degrading the gas. Open the regulator by turning the knob counterclockwise and install it onto the cylinder.
4 . The instrument initiates alarm indications except
indication in the GAS TEST menu even though the buzzer will sound in the event of a real gas alarm condition.
5 . Turn the regulator knob clockwise to close the regulator.
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6 . Unscrew the regulator from the calibration cylinder.
SEN DATE
M 7:49
CH4
M 7:49
19- 2.11
7 . Remove the calibration cup from the GX-3R. 8 . Store the calibration kit in a safe and convenient place. 9 . Press and release POWER MODE to return to the GAS TEST menu item in
Maintenance Mode.
10 . See “Entering Measuring Mode (START)” on page 106 to enter Measuring Mode.

Sensor/Battery Replacement Date (SEN DATE)

The SEN DATE menu item allows you to keep track of when the sensors and the battery were replaced.
1 . While in Maintenance Mode, press AIR to scroll to SEN DATE.
2 . Press and release POWER MODE. The combustible gas sensor’s replacement date
displays.
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3 . Use AIR to scroll to the item whose replacement date you want to view or change.
CH4
M 7:49
19- 2.11
O2
M 7:49
19- 2.11
ESCAPE
M 7:49
AIR
AIR
AIR
AIR
AIR
AIR
H2S
M 7:49
19- 2.11
CO
M 7:49
19- 2.11
BATTERY
M 7:49
19- 2.11
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
5 . Use the AIR button to scroll to the ESCAPE menu item.
date.
6 . Press and release POWER MODE to return to the SEN DATE menu item in
Maintenance Mode.
7 . See “Entering Measuring Mode (START)” on page 106 to enter Measuring Mode.

Performing a Bump Test (BUMP)

See “Performing a Bump Test (BUMP)” on page 47 for a description of the BUMP menu item.
100 • Appendix A: Maintenance Mode GX-3R Operator’s Manual
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