GX-3R
Operator’s Manual
Part Number: 71-0477
Revision: 0
Released: 4/6/22
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WARNING
Read and understand this instruction manual before operating
instrument. Improper use of the gas monitor could result in bodily
harm or death.
Maintenance of the gas monitor is essential for proper operation and
correct readings.
Bump test the instrument before each day’s use with a known
concentration of 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Infrared Communications Port. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Charging Socket and Battery Pack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Included Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Alligator Clip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Rubber Boot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Wrist Strap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Single-Unit AC Charger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Calibration Cup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Other Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
12 VDC Charger. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Multi-Unit AC Charger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Belt Clip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
SDM-3R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
RP-3R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Aspirator Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
IrDA Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Chapter 3: Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
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Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Turning On the GX-3R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Performing a Demand Zero . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Turning Off the GX-3R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Measuring Mode Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Monitoring an Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Combustible Gas Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Oxygen-Enriched Atmospheres. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
H2-Compensated CO Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Interference Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Aspirator Adapter Sampling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Alarm Indications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Responding to Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Data Logging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Chapter 4: Display Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
Tips for Using Display Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Peak Screen (PEAK). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
STEL Screen (STEL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
TWA Screen (TWA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Combustible Sensor Target Gas Conversion (LIST) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Changing the User ID (USER ID) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Changing the Station ID (STN ID) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Last Successful Calibration Date (CAL DATA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Last Successful Bump Test Date (BUMP DATA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Date, Time, and Temperature Screen (TEMP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Viewing Alarm Settings Screen (ALARM--PT). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Chapter 5: User Mode and Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Entering User Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Tips for Using User Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Performing a Bump Test (BUMP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Performing a Calibration (GAS CAL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Setting Calibration Parameters (CAL SET) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Setting Bump Test Parameters (BUMP SET) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Alarm Settings (ALARM--PT). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Updating the Lunch Break Setting (LUNCH) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Setting the Confirmation Beep and Non-Compliance Indicator (BEEP) . . . . . . . . . . . . . 87
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Updating the Backlight Time (BL TIME). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
Turning the Key Tone On/Off (KEY TONE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
Display Mode Items (DISP SET) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Zero Suppression (ZERO SUP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Zero Follower (ZERO.FLWR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Setting the Date/Time (DATE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Turning the Password On/Off (PASSWORD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Viewing the ROM/SUM (ROM/SUM). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Entering Measuring Mode (START) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Chapter 6: Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .94
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Instrument Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Recharging the Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Replacing the Buzzer Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Replacing the Sensor Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Combustible Gas Sensor Filter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Dual CO/H2S Sensor Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
CO-Only Sensor Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
H2S-Only Sensor Filter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Replacing the Hydrophobic Dust Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Replacing a Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Replacing the Battery Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Chapter 7: Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .108
Chapter 8: General Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .109
Appendix A: Maintenance Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Entering Maintenance Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
Tips for Using Maintenance Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Performing a Calibration (GAS CAL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Performing a Gas Test (GAS TEST). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
Sensor/Battery Replacement Date (SEN DATE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
Performing a Bump Test (BUMP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Setting Alarms to Latching or Self-Resetting (LATCHING) . . . . . . . . . . . . . . . . . . . . . 120
Turning the Demand Zero Function On/Off (DEM ZERO). . . . . . . . . . . . . . . . . . . . . . 120
Turning the Auto Zero Function On/Off (AUTOZERO) . . . . . . . . . . . . . . . . . . . . . . . . 121
Turning the ID Display Function On/Off (ID DISP) . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
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Turning the Zero Suppression On/Off (ZERO SUP) . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Turning the Zero Follower On/Off (ZERO.FLWR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
User Mode Zero Suppression (ZSUP.DISP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
User Mode Zero Follower (ZFLW.DISP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Setting the Date/Time (DATE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
Turning the Password On/Off (PASSWORD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
Viewing the ROM/SUM (ROM/SUM). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
Performing a Default (M.DEFAULT). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Entering Measuring Mode (START) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
Appendix B: Gas Select Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .127
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Entering Gas Select Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Tips for Using Gas Select Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Changing the Gas Combination (GAS COMB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
Saving the Alarm Points (SAVE-AP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
Turning Calibration Max Span On/Off (MAX SPAN) . . . . . . . . . . . . . . . . . . . . . . . . . . 133
Stealth and Vibrator Settings (STEALTH) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
LEL Definition (CHG LEL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
Exiting Gas Select Mode (START). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
Appendix C: Interference Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .137
ESR-A13i-H2S, H2S Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
ESR-A13P-CO, CO Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
ESR-A1CP-COH, H2-Compensated CO Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
ESR-A1DP-COHS, CO Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
ESR-A1DP-COHS, H2S Detection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
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 (H2S) simultaneously. The GX-3R’s compact size and easy-to-use design
make it ideally suited for a wide range of applications, including sewage treatment plants, utility
manholes, tunnels, hazardous waste sites, power stations, petrochemical refineries, mines, paper
mills, drilling rigs, and fire fighting stations. The 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)
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
Detection Range
Lowest
Detectable Limit
(LDL)
Reading
Increment
Warning
Setpoint
Alarm
Setpoint
Alarm H
Setpoint
STEL Setpoint
TWA Setpoint
Combustible Gas, Methane
(CH4) Calibration
Oxygen (O2)
Standard*
0 - 100% LEL 0 - 40% volume 0 - 200.0 ppm 0 - 2000 ppm
n/a n/a 0.5 ppm 3 ppm
1% LEL 0.1% volume 0.1 ppm 1 ppm
10% LEL 19.5% volume,
decreasing
25% LEL 18.0% volume,
decreasing
50% LEL 23.5% volume,
increasing
n/a n/a 5.0 ppm 200 ppm
n/a n/a 1.0 ppm 25 ppm
Hydrogen
Sulfide (H2S)
5.0 ppm 25 ppm
30.0 ppm 50 ppm
100.0 ppm 1200 ppm
Carbon
Monoxide (CO)
• Continuous environment
(-20°C to 50
Indication
Accuracy
* 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.
Sampling
reading or ± 2% LEL
(whichever is greater)
• Temporary environment
(-40°C to -21°C and 51°C to
60°C): ± 10% LEL
Diffusion
°
C): ± 5% of
Table 2: GX-3R Specifications
•0 - 25.0%:
± 0.5% O
• 25.1 - 40.0%:
± 3.0% O
2
2
• 0 - 100 ppm:
± 5% of reading
or ± 2 ppm H
(whichever is
greater)
• 101 - 200 ppm:
± 20% of reading
2
S
• 0 - 500 ppm:
± 5% of reading
or ± 5 ppm CO
(whichever is
greater)
• 501 - 2000 ppm:
± 20% of reading
Method
Response Time
Display
T90 within 30 seconds
Graphics LCD Display
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Environmental
Conditions
Table 2: GX-3R Specifications
• 3000 meter maximum altitude
• Operating pressure: 70 - 120 kPa (70 - 110 kPa for explosion proof)
• Pollution degree 2
• IP 66/68
Operating
Temperature
& Humidity
Safety/
Regulatory
Power Supply
Continuous
Operating
Hours
@ 25 °C
Continuous environment: -20°C to 50°C/Below 90% RH
Temporary environment (up to 15 minutes): -40°C to 60
• ATEX: Certificate Number: DEKRA 17ATEX0103 X
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)
• IECEx: Certificate Number: IECEx DEK 17.0050X
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)
• CSA classified, “C/US”, as Intrinsically Safe. Class I Division 1 Groups A, B, C, D T4.
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)
C US
186718
Lithium ion battery pack (3.7 VDC, 200 mA)
With combustible gas sensor: 25 hours in Measuring Mode (non-alarm operation)
Without combustible gas sensor
: 60 hours in Measuring Mode (non-alarm operation)
°
C/Below 95% RH
Battery
Charger
Input: 100 - 240 VAC, 47 - 63 Hz, 2.4 A
Output: 5.99 VDC, 2A max
Ratings
Case
Included
Accessories
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High-impact Plastic, RF Shielded, Dust and Weather Proof (IP66/68)
• Alligator clip
• Rubber boot
• Wrist strap
• Calibration cup
• Single-unit charger
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Other
Accessories
Table 2: GX-3R Specifications
• 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)
Dimensions
and Weight
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.)
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
LCDLEDs
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.
WARNING: A thin protective film covers the display to prevent scratches during shipping.
Remove this film before use. Leaving the film installed voids the intrinsically safe
certification.
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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 133.
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Sensors
The GX-3R uses three sensors to monitor combustible gas, oxygen (O2), carbon monoxide (CO),
and hydrogen sulfide (H2S) simultaneously. The sensors are located inside the GX-3R 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 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.
O2/CO/H2S Sensors
The O2, CO, and H2S sensors are electrochemical cells that consist of two precious metal
electrodes in a dilute acid electrolyte. A gas permeable membrane covers the sensor face and
allows gas to diffuse into the electrolyte. The gas reacts in the sensor and produces a current
proportional to the concentration of the target gas. The 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 H2S sensors available:
• CO only (ESR-A13P-CO): A single electrochemical cell that detects CO. Instruments
with this sensor cannot detect H2S.
•H2-compensated CO (ESR-A1CP-CO-H): A single electrochemical cell that detects CO.
This sensor does not respond to or responds minimally to hydrogen (displays H2 RICH
once H2 concentration reaches 2000 ppm). Instruments with this sensor cannot detect H2S.
•H2S only (ESR-A13i-H2S): A single electrochemical cell that detects H2S. Instruments
with this sensor cannot detect CO.
•CO/H2S (ESR-A1DR-COHS): A combination electrochemical cell that detects both CO
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.
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Filters
Combustible Gas Sensor H2S Removal Filter Disk (Dark Red)
An H2S removal filter disk is placed into a recess in the filter gasket over the combustible gas
sensor. The filter disk prolongs the life of the combustible gas sensor by preventing H2S in the
ambient air from reaching the sensor. The H2S filter disk is dark red in color and although it may
darken over time, its color is not indicative of remaining filter life.
The H2S filter disk needs replacing once it’s been exposed to 33 ppm hours of H2S. This means
the filter needs replacing after 80 minutes of exposure to 25 ppm H2S which equates to 40 2minute 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/H2S Sensor Dual Filter (Black and White)
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 H2S sensor.
Replace the filter if you notice:
• Unexplained CO readings.
• For users with a 1 ppm H2S alarm setpoint: A drift on the H2S zero reading, unexplained
H2S readings, the filter appears dirty, or every 6 months (whichever is sooner).
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 H2S, change the charcoal
filter.
H2S Sensor Humidity Filter (White)
A white humidity filter covers the H2S sensor. The filter absorbs humidity in the sampling
environment to prevent unstable readings around 0 ppm H2S. For users with a 1 ppm H2S 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 H2S setpoint, the
filter does not necessarily need to be replaced.
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.
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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 96.
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 2foot 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.
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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.
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.
WARNING: A thin protective film covers the display to prevent scratches during shipping.
Remove this film before use. Leaving the film installed voids the intrinsically safe
certification.
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 86), 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 appears
CAL--LMT
7:49
CAL
CAL--LMT
7:49
FAIL
NEXT CAL
7:49
0 d
next depends on how CAL EXPD is set in User Mode (see “CAL EXPD” on page 77). 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
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. If
Password Protection is set to
On using the SDM-3R PC
program, you must enter a
password. See page 63 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
To continue without
performing a calibration,
press and release AIR.
:
CAL EXPD set to
CANT USE
Buzzer sounds double pulsing
tone
• The GX-3R cannot be used
until a successful calibration
is performed. 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. If
Password Protection is set
to On using the SDM-3R PC
program, you must enter a
password. If you don’t press
POWER MODE, the
instrument automatically
goes to the AUTO CAL CYL
A screen after 6 seconds. If
Password Protection is set
to On using the SDM-3R PC
program, you must enter a
password. See page 63 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.
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. If
Password Protection is set
to On using the SDM-3R PC
program, you must enter a
password.
• Option B, Bypass message
To continue without
performing a calibration,
wait a few seconds for the
instrument to continue with
its startup sequence.
:
GX-3R Operator’s Manual Chapter 3: Operation • 20
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4. If BUMP.RMDR is set to ON (factory setting is OFF) and a bump test is due, the screen that
BUMP--LMT
7:49
CAL
BUMP--LMT
7:49
FAIL
NEXT BP
7:49
0 d
appears next depends on how BUMP.EXPD is set in User Mode (see “BUMP.EXPD” on
page 82). 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. If
Password Protection is set
to On using the SDM-3R PC
program, you must enter a
password. See page 56 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
To continue without
performing a bump test,
press and release AIR.
BUMP.EXPD set to
CANT USE
Buzzer sounds double pulsing
tone
The GX-3R cannot be used
until a successful bump test has
been performed. Press and
release POWER MODE to perform a bump test. The instru-
ment takes you straight to the
BUMP CYL A screen in User
Mode’s BUMP item. If
Password Protection is set to
On using the SDM-3R PC pro-
gram, you must enter a pass-
word. If you don’t press
POWER MODE, the instru-
ment automatically goes to the
BUMP CYL A screen after 6
seconds. If Password Protec-
tion is set to On using the
SDM-3R PC program, you
must enter a password. See
page 56 for bump test instruc-
tions.
:
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.
BUMP.EXPD set to
NONE
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. If
Password Protection is set
to On using the SDM-3R PC
program, you must enter a
password.
• Option B, Bypass message
To continue without
performing a bump test, wait
a few seconds for the
instrument to continue with
its startup sequence.
:
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5. The Date/Time Screen appears for a few seconds.
7:49
7:49
18 - 12.22
AL - L V
7:49
3.8
bAtt
6. The Battery Voltage Screen appears for a few seconds.
An “AL-L” at the bottom of the screen indicates that the alarms are set to latching. An
“AL-A” at the bottom of the screen indicates that the alarms are set to auto reset. See page
120 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.
GX-3R Operator’s Manual Chapter 3: Operation • 22
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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
U_ID_001
7:49
USEr Id
S_ID_001
7:49
Stn Id
8. If ID DISP is set to ON (factory setting is OFF, see page 121), the User ID Screen appears for a few seconds, followed by the Station ID Screen.
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9. If the GX-3R experiences a sensor failure during start up, the display shows which sensor
SENSOR
7:49
FAIL
CH4 %LEL
AUTOZERO
7:49
YES / MODE
7:49
NO / AIR
7:49
PASSWORD
7:49
0 0 0 0
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 page 121), the instrument prompts
you to do an auto zero. An auto zero operation sets the combustible gas, H
S, and CO
2
channels to zero and the OXY channel to 20.9%.
GX-3R Operator’s Manual Chapter 3: Operation • 24
WARNING: Make sure that the instrument is in a known fresh air environment (an
environment free of combustible or toxic gases and of normal oxygen content,
20.9%) before performing an auto zero operation. If you perform an auto zero
operation in an area with gases present, the adjustment will not be accurate.
You must press and release the POWER MODE button to perform an auto zero function. If
you do not press any key, after 15 seconds, the instrument enters Measuring Mode without
performing an auto zero.
If Password Protection is turned On (factory setting is Off) using the SDM-3R PC
program, a user-set password is required to perform an auto zero. When the password
screen appears, adjust each digit with the AIR button and press and release the POWER
MODE button to move on to the next digit. Once the password is entered, the instrument
performs the auto zero.
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11. The combustible gas sensor actually contains 2 separate sensors: a standard catalytic sensor
LIMITED
7:49
GAS LIST
HC
7:49
0 0.0
CO ppm H2S ppm
0 20.9
CH4 %LEL O2 %
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 page 43 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.
25 • Chapter 3: Operation GX-3R Operator’s Manual
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5. If Password Protection is turned On (factory setting is Off) using the SDM-3R PC program,
PASSWORD
7:49
0 0 0 0
PASSWORD
7:49
0 0 0 0
a user-set password is required to perform a demand zero. When the password screen appears,
adjust each digit with the AIR button and press and release the POWER MODE button to
move on to the next digit. Once the password is entered, the instrument performs the demand
zero.
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 Password Protection is turned On (factory setting is Off) using the SDM-3R PC program,
a user-set password is required to turn off the GX-3R. When the password screen appears,
adjust each digit with the AIR button and press and release the POWER MODE button to
move on to the next digit. Once the password is entered, the instrument shuts off.
5. If you plan to leave the instrument off for an extended period of time, see page 108.
GX-3R Operator’s Manual Chapter 3: Operation • 26
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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 page 89 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 (page 87).
Monitoring an Area
1. Start up the GX-3R as described above in “Start Up” on page 19. 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 page 31.
4. If a gas alarm occurs, take appropriate action. See page 35.
5. Do not expose the GX-3R to rain.
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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 page 56.
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 page 98 and page 100 if they become saturated.
c. Perform a bump test as described on page 56.
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
page 25.
b. Perform a bump test as described on page 56.
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 (CH4). If the instrument is setup for and 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 43.
Manual Conversion
You can manually calculate a converted target gas reading using Table 4 if the instrument’s
calibrated target gas is methane. The table 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.
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
LEL Conversion
Factor (from CH4 Cal.)
Gas
LEL Conversion
Factor (from CH4 Cal.)
Butadiene 1.52 Methane 1.00
GX-3R Operator’s Manual Chapter 3: Operation • 28
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Table 4: LEL Hydrocarbon Conversion Factors
Gas
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
Hydrogen 0.95 Xylene 7.69
LEL Conversion
Factor (from CH4 Cal.)
Gas
LEL Conversion
Factor (from CH4 Cal.)
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 H2S scrubber disks protect the combustible sensor from H2S, but you should avoid other
sulphur compounds.
29 • Chapter 3: Operation GX-3R Operator’s Manual
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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 page 43 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.
•H2 reading is not displayed but “H2 RICH” appears once H2 concentration rises above
2000 ppm.
Interference Information
Some gases interfere with CO and H2S sensors. For a complete list of these gases, see page 137.
GX-3R Operator’s Manual Chapter 3: Operation • 30
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Aspirator Adapter Sampling
Probe
Hose
Aspirator Bulb
FRONT
GX-3R
AIR
POWER
MOD E
CO/H
2
S LEL O
2
Sample Cup
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 page 19.
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.
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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 page 41).
NOTE: The peak readings for each channel are saved until a higher peak is recorded,
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)
Alarm Indications
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.
interference. Keep the GX-3R away from RF and EMI sources such as radio
transmitters or large motors.
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 page 133 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
Warning
Concentration of gas rises
above the Warning setting or
falls below the Warning setting
for O
.
2
• Affected channel’s gas reading,
gas name, and units flash
• WA R NI NG appears at the bottom
of the LCD
• Alarm LEDs flash in circle
sequence once per second
• Backlight turns on
• High-low tone sounding
once per second
• Vibrator pulses once per
second
GX-3R Operator’s Manual Chapter 3: Operation • 32
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Table 5: Alarm Types and Indications
Alarm Type Visual Indications Other Indications
Alarm
Concentration of gas rises
above the Alarm setting or falls
below the Alarm setting for O
2
Alarm H
Concentration of gas rises
above the Alarm H setting.
TWA or STEL
Concentration of CO or H2S
rises above the TWA or STEL
alarm setting.
• 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
• 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
• High-low tone sounding
twice per second
• Vibrator pulses twice
per second
• High-low tone sounding
twice per second
• Vibrator pulses twice
per second
• High-low tone sounding
once per second
• Vibrator pulses once per
second
H2 RICH (for GX-3Rs with H2compensated CO sensor)
Concentration of hydrogen rises
above 2000 ppm (parts per mil-
lion).
Over Range
• Backlight turns on
• H2 and rich alternate in the lower
right corner
• OVER appears at the bottom of
the LCD
• Alarm LEDs flash twice per
second
• Backlight turns on
• Affected channel’s gas reading is
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
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
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
Dead Battery Alarm • Gas readings disappear. FAI L
Sensor Failure
• The last bar in the battery icon
starts flashing
appears in the middle of the screen
and BATTERY appears at the
bottom of the screen.
• Alarm LEDs flash once per
second
• SENSOR appears at the bottom of
the screen and the failed sensor(s)
are indicated with FAIL under the
gas name.
• 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
HC GAS LIST LIMITED
Clock Failure
System Failure
• Alarm LEDs flash once per
second
• HC GAS LIST LIMITED
appears on the screen.
• Alarm LEDs flash once per
second
• FAIL appears in the middle of the
screen and CLOCK appears at the
bottom of the screen.
• Alarm LEDs flash once per
second
• 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
GX-3R Operator’s Manual Chapter 3: Operation • 34
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Responding to Alarms
PASSWORD
7:49
0 0 0 0
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.
If Password Protection is turned On (factory setting is Off) using the SDM-3R PC
program, you must press POWER MODE and AIR at the same time and then enter a userset password to reset an alarm condition. When the password screen appears, adjust each
digit with the AIR button and press and release the POWER MODE button to move on to
the next digit. Once the password is entered, the alarm condition resets.
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 (H2-Compensated CO Sensor Only)
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.
PASSWORD
7:49
0 0 0 0
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.
If Password Protection is turned On (factory setting is Off) using the SDM-3R PC
program, you must press POWER MODE and AIR at the same time and then enter a userset password to reset an alarm condition. When the password screen appears, adjust each
digit with the AIR button and press and release the POWER MODE button to move on to
the next digit. Once the password is entered, the alarm condition resets.
4. Calibrate the GX-3R as described on page 51.
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 96.
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 96.
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 page 51.
3. If the sensor failure continues or if the sensor could not be calibrated, replace the sensor as described on page 102.
GX-3R Operator’s Manual Chapter 3: Operation • 36
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4. If the sensor failure condition continues after you have replaced the sensor, contact RKI
CLOCK
7:49
FAIL
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 page 43 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.
Responding to Clock Failure Alarms
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 page 108 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 page 91 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 page 91.
3. If the date cannot be set correctly, contact RKI Instruments, Inc. as soon as possible.
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Responding to System Failure Alarms
SYSTEM
7:49
031
FAIL
1. If a system failure occurs, the system failure screen displays an error code as shown below:
2. The error code meanings are shown in the table below:
Table 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.
CAUTION: There will be no datalogging function if you operate the instrument after a 031
system failure. Contact RKI Instruments, Inc. as soon as possible.
GX-3R Operator’s Manual Chapter 3: Operation • 38
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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 /gx3r. 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.
Table 7: Data Logging Capacity
Interval Time
10 seconds 10 hours
20 seconds 20 hours
30 seconds 30 hours
1 minute 60 hours
3 minutes 180 hours
5 minutes (factory set-
ting)
10 minutes 600 hours
Data Logging
Time
300 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
PEAK (page 41) Displays each sensor’s Peak reading.
STEL (page 42) Displays the STEL readings (CO and H
TWA (page 42) Displays the TWA readings (CO and H
LIST (page 43)
USER ID (page 45)
STN ID (page 46)
CAL DATA (page 47)
A
B
B
Description
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)
View and/or change the User ID.
View and/or change the Station ID.
C
Displays each sensor’s last calibration date.
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)
BUMP DATA (page
D
48)
TEMP (page 49) Displays the current date, time, and temperature.
ALARM--PT (page 49) 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).
GX-3R Operator’s Manual Chapter 4: Display Mode • 40
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Displays each sensor’s last bump test date.
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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 %
• 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 GX3R 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 page 86 for instructions to turn the
lunch break feature on (default is off).
To clear the peak readings, do the following:
NOTE: If Password Protection is set to On using the SDM-3R PC program, the peak reading
cannot be cleared.
1. After entering Display Mode, press and release POWER MODE until PEAK appears.
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2. Press and hold AIR until the screen prompts you to release it.
HOLD AIR
7:49
CLEAr
RELEASE
7:49
CLEAr
STEL
7:49
10 2.0
CO ppm H2S ppm
TWA
7:49
5 0.5
CO ppm H2S ppm
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.
STEL Screen (STEL)
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 page 86 for instructions to turn the lunch break
feature on (default is off).
GX-3R Operator’s Manual Chapter 4: Display Mode • 42
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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 target gas based on a CH4 or iC4H10
calibration. It does not change the calibrated target gas. You must go to Gas Select Mode’s GAS
COMB item to change the calibrated target gas.
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.
Available Converted
Gas
Target Gases Based on
Calibrated Target Gas
(Selected in Gas Select
Mode)
CH4
(methane)
i-C4H10
(isobutane)
Available
Converted Target
Gases During HC
GAS LIST
LIMITED Status
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
43 • Chapter 4: Display Mode GX-3R Operator’s Manual
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Available Converted
LIST
7:49
HC GAS
Target Gases Based on
Calibrated Target Gas
Gas
(Selected in Gas Select
Mode)
CH4
(methane)
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
i-C4H10
(isobutane)
Available
Converted Target
Gases During HC
GAS LIST
LIMITED Status
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
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 screen.
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
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 factoryinstalled 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 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 USER ID screen sequence appears.
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2. To change the User ID, press and release AIR. The current User ID flashes.
U_ID_002
7:49
USEr 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
3. Use AIR to scroll to the desired User ID.
4. Press and release POWER MODE to save the User ID and return to the USER ID screen in Display Mode.
Changing the Station ID (STN ID)
This screen only appears if DISP.SET in User Mode is set to ON (factory setting) and if ID DISP
in Maintenance Mode is set to ON (factory setting is OFF).
Use this screen to select a station ID from the 128 station IDs that are stored in the
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.
Station IDs can only be selected in this menu item. In order to edit the 128 station 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.
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3. Use AIR to scroll to the desired station ID.
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
4. Press and release POWER MODE to save the station ID and return to the STN ID screen in Display Mode.
Last Successful Calibration Date (CAL DATA)
The CAL DATA screen shows the date of 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.
47 • 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
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.
GX-3R Operator’s Manual Chapter 4: Display Mode • 48
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Date, Time, Temperature Screen (TEMP)
22°C
7:49
7:49
18- 12. 26
ALARM--PT
7:49
dISP
The TEMP screen shows the instrument’s date and time and the surrounding area’s temperature.
Alarm Points Screen (ALARM--PT)
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.
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3. Use AIR to scroll through the Warning, Alarm, Alarm H, STEL, and TWA settings.
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
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.
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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 (page 56) Perform a bump test.
GAS CAL (page 63) Perform a fresh air adjustment, perform a span adjustment, change the calibration gas
Description
BUMP
CYL X
START Begin the warmup sequence and enter Measuring Mode.
ESCAPE Return to the BUMP menu item.
concentration, set the cylinder group.
AIR CAL
(page 63)
AUTO CAL
(page 64)
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
CAL-P Set the calibration gas concentration for each gas.
Perform an automatic span adjustment on the gases
selected for Cylinder X (A-E cylinders available).
Mode.
CYL SEL Assign a cylinder (A-E) to each gas (all 4 gases set
to Cylinder A is the default). For single cal opera-
tion, you would assign each gas its own cylinder.
ESCAPE Return to the AUTO CAL menu item.
ESCAPE Return to the GAS CAL menu item.
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Table 9: User Mode Menu Items
User Mode
Menu Item
CAL SET (page 75) Change calibration parameters.
Description
CAL RMDR
(page 76)
CAL INT
(page 76)
CAL EXPD
(page 77)
ESCAPE Return to the CAL SET menu item in User Mode.
(factory setting): The instrument notifies the user upon startup
ON
when a calibration is due. Notification type depends on CAL
EXPD setting below.
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)
Defines what action must be taken if a calibration is due upon
startup.
CONFIRM
edge that calibration is due and continue to Measuring Mode.
CANT USE
bration is performed.
NONE
sequence continues.
: A screen indicates that calibration is due but warmup
(factory setting): Press and release AIR to acknowl-
: Cannot enter Measuring Mode until a successful cali-
BUMP SET (page 78) Change bump test parameters.
SETTINGS
(page 78)
GAS TIME How long gas is applied during a bump test.
CHECK Percentage of calibration gas concentration that the
CAL TIME How long gas is applied during a calibration. GAS
AUTO
CAL
ESCAPE Return to the SETTINGS menu item in BUMP
Choices: 30 (factory setting), 45, 60, 90 seconds
bump test reading must be within in order to pass
bump.
Options: 10%, 20%, 30%, 40%, 50% (factory set-
ting)
TIME is deducted from this time.
Options: 90 (factory setting) or 120 seconds
ON
(factory setting): If a bump test fails, a calibra-
tion automatically starts.
OFF
: If a bump test fails, a calibration does not
automatically start.
SET.
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Table 9: User Mode Menu Items
User Mode
Menu Item
BUMP SET (page 78)
(cont’d)
ALARM-PT (page 83) Set alarm points for all channels (WARNING, ALARM, ALARM H, STEL, TWA) or
Description
BUMP.RMDR
(page 81)
BUMP INT
(page 81)
BUMP.EXPD
(page 82)
ESCAPE Return to the BUMP SET menu item in User Mode.
reset all alarms to their default settings.
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
edge that bump test is due and continue to Measuring Mode.
CANT USE
bump test is performed.
NONE
sequence continues.
(factory setting): Press and release AIR to acknowl-
: Cannot enter Measuring Mode until a successful
: A screen indicates that bump test is due but warmup
LUNCH (page 86) ON
BEEP (page 87) Set confirmation beep parameters.
: Lunch break feature is on. Instrument asks if you want to resume TWA and
PEAK readings at startup.
OFF
(factory setting): Lunch break feature is off. Instrument resets TWA and PEAK
readings every time it’s turned on.
BEEP SEL
(page 87)
: LEDs flash and instrument vibrates based on interval defined
LED
in BEEP INT to confirm instrument is still operating.
BUZZER
val defined in BEEP INT to confirm instrument is still operating.
LED+BUZZ
based on interval defined in BEEP INT to confirm instrument is
still operating.
BUMP/CAL
if bump test or calibration is due.
ALM ALRT
if 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
ating or that a bump test or calibration is due.
: Buzzer sounds and instrument vibrates based on inter-
: LEDs flash, buzzer sounds, and instrument vibrates
: LEDs flash based on interval defined in BEEP INT
: LEDs flash based on interval defined in BEEP INT
: LEDs flash based on interval defined in BEEP INT if
(factory setting): No alerts to confirm instrument is still oper-
53 • 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 (page 87)
(cont’d)
Description
BEEP INT
(page 88)
Confirmation alert interval. Confirmation type defined in BEEP
SEL.
Options: 0.5 minute and 1 to 99 minutes in 1 minute increments.
The factory setting is 5 minutes.
ESCAPE Return to the BEEP menu item in User Mode.
BL TIME (page 89) 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 (page 89) ON
DISP SET (page 90) OFF
(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.
ZERO SUP (page 90)* ON
(factory setting): Not intended for field adjustment. The suppression values are:
Combustible Gas: 2% LEL
O
: 0.5% volume
2
H
S: 0.3 ppm
2
CO: 2 ppm
ZERO.FLWR (page 91)** ON
(factory setting): Not intended for field adjustment. Oxygen channel does not
support zero follower functionality.
DATE (page 91) Set the instrument’s date and time.
PASSWORD (page 92) ON
: User Mode is password-protected. Factory-set password is 0405.
OFF
(factory setting): User Mode is not password-protected.
ROM/SUM (page 93) View the firmware information for the GX-3R’s sensor board and main board.
START (page 93) Press and release POWER MODE to begin the warmup sequence and enter Measur-
ing Mode.
* Only appears if ZSUP.DISP is set to ON in Maintenance Mode.
** Only appears if ZFLW.DISP is set to ON in Maintenance Mode.
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Entering User Mode
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
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 PAS SW ORD item.
If PASSWORD is set to OFF (factory setting), continue with Step 6.
If PASSWORD is set to ON, continue with Step 4.
4. If PASSWORD 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.
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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
• 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 page 70.
Min. Cal. Gas
Concentration
Max. Cal. Gas
Concentration
2. Confirm that your cylinder selections are appropriate as described on page 73.
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3. Install the calibration cup onto the GX-3R. Use the label and imprinting to make sure that the
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 %
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 page 70 if the calibration values do not match the
calibration gas cylinder’s concentrations). The bottom of the screen alternates between “CYL
A” and “BUMP”.
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7. If necessary, use AIR to scroll to the Bump screen for the gas(es) you want to bump test. As
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 %
shipped from the factory, combustible gas, O2, H2S, and CO are assigned to Cylinder A. If a
H2-compensated CO sensor is installed, H2 is assigned to Cylinder D but there is 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.
9. For toxic gas cylinders (like cylinders containing H2S), it is important to vent the 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.
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12. At the end of the countdown, the instrument analyzes the results. Follow the flow chart to
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
determine the bump test outcome.
59 • 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.
• 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.
• 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. 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.
2. Close the regulator.
3. Unscrew the regulator.
4. Remove the calibration cup.
5. Press and release POWER MODE to enter Measuring Mode.
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.
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GX-3R Operator’s Manual Chapter 5: User Mode and Calibration • 60
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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.
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61 • 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.
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.
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GX-3R Operator’s Manual Chapter 5: User Mode and Calibration • 62
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.
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 %
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 H2-compensated CO sensor needs to be set both monthly
and when the 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.
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.
63 • Chapter 5: User Mode and Calibration GX-3R Operator’s Manual
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6. Press and hold AIR until the screen prompts you to release it.
HOLD AIR
M 7:49
Air CAL
RELEASE
M 7:49
Adj
7. If the fresh air adjustment passes, the instrument returns to the GAS CAL menu.
8. If the fresh air adjustment fails, “FAIL AIR” displays. Press and release POWER MODE to acknowledge the failure. See “Troubleshooting” on page 94.
Performing a Span Adjustment in AUTO CAL
Preparing for a Span Adjustment
To adjust the span on the GX-3R, you will need the following:
• 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
sensor); sensor needs monthly calibration
-compensated CO
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 page 70.
2. Confirm that your cylinder selections are appropriate as described on page 73.
GX-3R Operator’s Manual Chapter 5: User Mode and Calibration • 64
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3. Install the calibration cup onto the GX-3R. Use the label and imprinting to make sure that the
GX-3R
AIR
POWER
MODE
CO/H2SLELO
2
FRONT
Inlet
Figure 9: Calibration Cup Installation
GAS CAL
M 7:49
AUTO CAL
M 7:49
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.
Performing a Span Adjustment
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.
65 • Chapter 5: User Mode and Calibration GX-3R Operator’s Manual
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4. Press and release POWER MODE. The display shows the gases assigned to Cylinder A and
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 %
their assigned calibration values (see page 70 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
H2-compensated CO sensor is installed, H2 is assigned to Cylinder D.
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.
9. For toxic gas cylinders (like cylinders containing H2S), it is important to vent the 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.
GX-3R Operator’s Manual Chapter 5: User Mode and Calibration • 66
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12. Follow the flow chart to determine the calibration outcome.
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?
67 • 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
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 page 133),
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 page 133),
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 page 43 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 page 43 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 page 133),
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 94.
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 page 43 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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69 • Chapter 5: User Mode and Calibration GX-3R Operator’s Manual
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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.
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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
Hydrogen (for H
sensor); sensor needs monthly calibration
-compensated CO
2
Min. Cal.
Concentration
25 ppm 2,000 ppm
Max. Cal.
Concentration
10. Press and release POWER MODE to save the change. The calibration gas value 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 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 75 to return to User Mode.
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Making Cylinder Selections in CYL SEL
GAS CAL
M 7:49
AUTO CAL
M 7:49
CYL SEL
M 7:49
CYL SEL
M 7:49
- - -
CH4 %LEL
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 H2 response for the H2-compensated CO sensor 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: O2, Cylinder C: H2S, Cylinder D: CO).
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 displays.
5. Use AIR to scroll to CYL SEL.
6. Press and release POWER MODE. The combustible gas channel displays.
73 • Chapter 5: User Mode and Calibration GX-3R Operator’s Manual
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7. Use AIR to scroll to the channel whose cylinder assignment you want to change.
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
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.
GX-3R Operator’s Manual Chapter 5: User Mode and Calibration • 74
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14. Press AIR to scroll to ESCAPE.
CAL SET
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 75 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 93 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.
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CAL RMDR
CAL RMDR
M 7:49
CAL INT
M 7:49
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 page 77).
OFF: The GX-3R does not give an indication at start up if it is due for calibration.
1. After entering the CAL SET menu, press AIR to scroll to CAL RMDR.
2. Press and release POWER MODE. The current setting flashes.
3. Use AIR to display the desired setting.
4. Press and release POWER MODE to save the setting and return to the CAL RMDR menu item.
5. See “Exiting the CAL SET Menu” on page 77 to return to User Mode.
CAL INT
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 77 to return to User Mode.
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CAL EXPD
CAL EXPD
M 7:49
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: The GX-3R gives an indication at start up if calibration is past due. Press and
release POWER MODE to enter User Mode and perform a calibration. Pressing AIR has no
effect. A successful calibration must be performed in order to use the instrument.
NONE: The 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.
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 77 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 93 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.
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2. Press and release POWER MODE. The current setting flashes.
CHECK
M 7:49
CAL TIME
M 7:49
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 80 to return to the BUMP SET menu.
6. See “Exiting the BUMP SET Menu” on page 82 to return to User Mode.
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 80 to return to the BUMP SET menu.
6. See “Exiting the BUMP SET Menu” on page 82 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.
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3. Use AIR to display the desired setting.
AUTO CAL
M 7:49
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 80 to return to the BUMP SET menu.
6. See “Exiting the BUMP SET Menu” on page 82 to return to User Mode.
AUTO CAL
ON (factory setting): If a bump test fails, the unit automatically begins a calibration.
OFF: If a bump test fails, the unit does not automatically begin a calibration.
1. After entering the 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 80 to return to the BUMP SET menu.
6. See “Exiting the BUMP SET Menu” on page 82 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.
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BUMP.RMDR
BUMP.RMDR
M 7:49
BUMP INT
M 7:49
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 page 82).
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 82 to return to User Mode.
BUMP INT
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 82 to return to User Mode.
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BUMP.EXPD
BUMP.EXPD
M 7:49
This item defines what indication is given during start up when a bump test is due and
BUMP.RMDR is set to ON.
CONFIRM (factory setting): The GX-3R gives an indication at start up if a bump test is past due.
Press and release AIR to continue without bump testing or press and release POWER MODE to
perform a bump test.
CANT USE: The GX-3R gives an indication at start up if a bump test is past due. Press and
release POWER MODE to enter User Mode and perform a bump test. Pressing AIR has no effect.
A successful bump test must be performed in order to use the instrument.
NONE: The GX-3R gives an indication at startup if a bump test is past due. If desired, press
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.
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 82 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 93 to enter Measuring Mode.
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Alarm Settings (ALARM--PT)
ALARM--PT
M 7:49
ALARM--PT
M 7:49
- - -
CH4 %LEL
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.
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Setting the Alarm Points
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
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.
Channel Alarm Point Limitations
Combustible Gas 5% LEL WARNING ALARM ALARM H 60% LEL
O
2
H
S 1.0 ppm WARNING ALARM ALARM H 200.0
2
CO 15 ppm WARNING ALARM ALARM H 2000 ppm
•0.0% ALARM WARNING 21.8%
• 20.0% ALARM H 40.0%
ppm
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 H2S only) and TWA (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 86 to return to User Mode.
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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 86 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 93 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.
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2. Press and release POWER MODE. The current setting flashes.
BEEP
M 7:49
BEEP SEL
M 7:49
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 93 to enter Measuring Mode.
Setting the Confirmation Beep and 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.
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ALM ALRT: If the instrument goes into any gas alarm, the LEDs double flash as often as defined
BEEP SEL
M 7:49
BEEP INT
M 7:49
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
program), a data download may also be needed to clear the non-compliance.
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
successful bump test).
b. CAL EXPD is set to CONFIRM or NONE and a calibration is due (cleared by
successful calibration).
c. The instrument goes into any gas alarm (cleared by successful bump test or 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 non-compliance.
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 89 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.
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2. Press and release POWER MODE. The current setting flashes.
BL TIME
M 7:49
KEY TONE
M 7:49
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 89 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 93 to enter Measuring Mode.
Updating the Backlight Time (BL TIME)
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 93 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.
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2. Press and release POWER MODE. The current setting flashes.
DISP SET
M 7:49
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 93 to enter Measuring Mode.
Display Mode Items (DISP SET)
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 93 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
2
Zero Suppression
Val ue
0.5% volume
S 0.3 ppm
H
2
CO 2 ppm
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Zero Follower (ZERO.FLWR)
DATE
M 7:49
M 7:49
7:49
18 - 12.20
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.
Setting the Date/Time (DATE)
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 93 to enter Measuring Mode.
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Turning the Password On/Off (PASSWORD)
PASSWORD
M 7:49
PASSWORD
M 7:49
0 4 0 5
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 PASSWORD.
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 PASSW OR D item in User Mode.
If you selected ON, continue with Step 5.
5. Press and release POWER MODE. The Set Password Screen appears. The current password appears and the first digit flashes.
6. Use AIR to display a number from 0 to 9.
7. Press and release POWER MODE to enter the selection and advance to the next number. To go back a number, press and hold AIR and POWER MODE for a few seconds.
8. Repeat Step 6 and Step 7 to select the remaining numbers. When you press and release POWER MODE to enter the last number, the password is saved and you return to the PASSW OR D item in User Mode.
9. See “Entering Measuring Mode (START)” on page 93 to enter Measuring Mode.
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Viewing the ROM/SUM (ROM/SUM)
ROM / SUM
M 7:49
MAIN ROM
M 7:49
2E86
35709
SENS. ROM
M 7:49
C1E3
35707
START
M 7:49
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 93 to enter Measuring Mode.
Entering Measuring Mode (START)
1. While in User Mode, press AIR to scroll to START.
2. Press and release POWER MODE. The instrument begins its warmup sequence.
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Chapter 6: Maintenance
Overview
This chapter describes troubleshooting procedures for the 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.
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Recharging the Batteries
Figure 11: Connecting the Charging Cable
OR
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.
1. Make sure the GX-3R is off.
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.
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4. The LED at the top of the GX-3R turns orange while charging. When a full charge has been
Figure 12: Removing the Charging Cable
OR
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.
Replacing the Buzzer Cover
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.
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5. Install the new buzzer cover between the AIR and POWER MODE buttons as shown below.
Figure 13: Buzzer Cover Replacement
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
The H2S filter disk is dark red in color and although it may darken over time, its color is not
indicative of remaining filter life. The H2S filter disk can absorb H2S for 33 ppm hours and
should be replaced after that much exposure. With this many ppm hours of absorption, the H2S
filter disk should be replaced after 80 minutes of exposure to 25 ppm H2S. This equates to
replacing the H2S filter disk after 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.
Dual CO/H2S Sensor Filter
The dual CO/H2S sensor has a half black/half white filter installed over it. The filter should be
replaced if you notice either 1) unexplained CO readings or 2) For users with a 1 ppm H2S alarm
setpoint: a drift on the H2S channel’s zero reading, 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.
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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 H2S. For users with a 1 ppm
H2S alarm setpoint, the filter should be replaced if you notice: a drift on the H2S channel’s zero
reading, unexplained H2S readings, the filter appears dirty, or every 6 months (whichever is
sooner). For users with a 2 ppm or higher H2S alarm setpoint, the filter does not necessarily ever
need to be replaced.
Replacement Procedure
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 H2S scrubber disk for combustible gas sensor: The brown side of the filter case
should face toward the GX-3R.
b. Black and white combo filter for CO/H2S dual sensor: The red side of the filter case
should face toward the GX-3R. The black filter material should face the edge of the GX3R while the white filter material should face the H2S scrubber disk.
c. Black filter for CO-only sensor: The red side of the filter case should face toward the GX-
3R.
d. White filter for H2S-only sensor: The white side of the filter case should face toward 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: Allfiltersinstalledblack-side-up.
Black
Filter
Material
Side View
Sensor
Retainer
Toxic Sensor Filter, See Table
Filter Gasket/Hydrophobic Dust
Filter Assembly,
gasket tabs on opposite side 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 page 56 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 the gasket and
replace it with a filter gasket/hydrophobic dust filter assembly.
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.
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