RKI Instruments 72-PAB-C, 72-PAA-C, 72-PAX-C, 72+A1:B16-PAC-C User manual

GX-3R Pro
Operator’s Manual
Part Number: 71-0478
Revision: P16
Released: 9/16/21
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Read and understand this instruction manual before operating instrument. Improper use of the gas monitor coul d 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 TEST 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.
GX-3R Pro Operator’s Manual
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Table of Contents

Chapter 1: Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
About the GX-3R Pro . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
About this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Chapter 2: Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Instrument Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
LCD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Control Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Alarm LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Buzzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Vibrator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Infrared Communications Port. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Charging Socket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Included Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Alligator Clip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Rubber Boot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Wrist Strap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Single-Unit AC Charger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Calibration Cup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Other Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
12 VDC Charger. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Multi-Unit AC Charger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Belt Clip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
SDM-3R. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
RP-3R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Aspirator Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
IrDA Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Chapter 3: Measuring Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Turning On the GX-3R Pro . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Performing a Demand Zero . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Turning Off the GX-3R Pro . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Measuring Mode Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Monitoring an Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Combustible Gas Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Oxygen-Enriched Atmospheres. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
H2-Compensated CO Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
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Interference Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
CO2 Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Aspirator Adapter Sampling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Alarm Indications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Responding to Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Data Logging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
Chapter 4: Display Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Tips for Using Display Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Peak Screen (PEAK). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
STEL Screen (STEL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
TWA Screen (TWA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Combustible Sensor Target Gas Conversion (HC GAS LIST). . . . . . . . . . . . . . . . . . . . . 40
User ID Screen (USER ID). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Station ID Screen (STATION ID). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Last Successful Calibration Date (CAL DATA). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Last Successful Bump Test Date (BUMP DATA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Date, Time, and Temperature Screen (DATE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Alarm Points Screen (ALARM POINTS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Screen Inversion On/Off (INVERT SELECT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
LCD Color Scheme (LCD BACKGROUND) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Turning Bluetooth On/Off (BLUETOOTH). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Adjusting the Buzzer Volume (BUZZER VOLUME) . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Changing Instrument Language Back to English (LANGUAGE) . . . . . . . . . . . . . . . . . . 49
Chapter 5: User Mode and Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Entering User Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Tips for Using User Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Performing a Bump Test (BUMP TEST) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Performing a Calibration (GAS CAL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Setting Calibration Parameters (CAL SETTING) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Setting Bump Test Parameters (BUMP SETTING) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Adjusting Man Down and Panic Settings (MAN DOWN). . . . . . . . . . . . . . . . . . . . . . . . 82
Alarm Settings (ALARM SETTING). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Updating the Lunch Break Setting (LUNCH BREAK) . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Setting the Confirmation Beep and Non-Compliance Indicator (CONFIRMATION) . . . 89
Auto Backlight in Low Light (AUTO BACKLIGHT). . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Updating the Backlight Time (BACKLIGHT TIME). . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Turning the Key Tone On/Off (KEY TONE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Display Mode Items (D MODE SETTING). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Reading Units for IR Sensor (IR UNIT SELECT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
CO2 Fresh Air Adjustment On/Off (CO2 AIR SETTING) . . . . . . . . . . . . . . . . . . . . . . . 94
Setting the Date/Time (DATE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Setting the Date Format (DATE FORMAT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Changing the Instrument Language (LANGUAGE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Turning the Password On/Off (USER PASSWORD). . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
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Viewing the ROM/SUM (ROM/SUM). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Viewing the Radio Standards (RADIO STANDARD). . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Returning to Measuring Mode (START MEASURE) . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Chapter 6: Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Instrument Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Replacing the Batteries (Alkaline Version). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Recharging the Batteries (Li-ion Version) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Replacing the Buzzer Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Replacing the Sensor Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Replacing the Hydrophobic Dust Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Replacing a Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Replacing the Battery Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Chapter 7: Storage and Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Chapter 8: General Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Appendix A: RK Link Phone App . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Installing the App . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Important Setup Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Pairing a GX-3R Pro. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Searching for a Paired GX-3R Pro . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Disconnecting a Paired GX-3R Pro . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Adjusting App Notification Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Defining Owner Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
Setting Up Email/Text Alerts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
Changing GX-3R Pro Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
Alarm Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
Calibration and Bump Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Backlight Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
Logger Data Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
Viewing Serial Number, IDs, and Bump/Cal Information . . . . . . . . . . . . . . . . . . . . . . . 142
Viewing App Version Info . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
Appendix B: Maintenance Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
Entering Maintenance Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
Tips for Using Maintenance Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
Performing a Calibration (GAS CAL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
Performing a Gas Test (GAS TEST). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
Sensor/Battery Replacement Date (SENSOR DATE) . . . . . . . . . . . . . . . . . . . . . . . . . . 152
Performing a Bump Test (BUMP TEST) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
Setting Alarms to Latching or Self-Resetting (LATCHING) . . . . . . . . . . . . . . . . . . . . . 154
Turning Demand Zero On/Off (DEMAND ZERO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154
Turning Auto Zero On/Off (AUTO ZERO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
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Turning ID Display Function On/Off (ID DISPLAY) . . . . . . . . . . . . . . . . . . . . . . . . . . 155
Turning Zero Suppression On/Off (ZERO SUPPRESS) . . . . . . . . . . . . . . . . . . . . . . . . 156
Turning Zero Follower On/Off (ZERO FOLLOWER) . . . . . . . . . . . . . . . . . . . . . . . . . 156
User Mode Zero Suppression (DISP ZERO SUP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156
User Mode Zero Follower (DISP ZERO FLWR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156
Setting the Date/Time (DATE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
Setting the Date Format (DATE FORMAT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
Setting the Instrument Language (LANGUAGE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
Turning the Password On/Off (MAINT PASSWORD) . . . . . . . . . . . . . . . . . . . . . . . . . 158
Viewing the ROM/SUM (ROM/SUM). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
Adjusting the LCD’s Contrast (LCD CONTRAST). . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
Performing a Default (M.DEFAULT). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
Exiting Maintenance Mode (START MEASURE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161
Appendix C: Gas Select Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
Entering Gas Select Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
Tips for Using Gas Select Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
Changing the Gas Combination (GAS COMBO). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
Saving the Alarm Points (SAVE ALARM-P) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166
Turning the Calibration Max Span On/Off (DISP MAX SPAN) . . . . . . . . . . . . . . . . . . 166
Stealth and Vibrator Settings (STEALTH) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167
LEL Definition (CHANGE LEL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168
Exiting Gas Select Mode (START MEASURE). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169
Appendix D: Interference Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
ESR-A13D-HCN, HCN Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
ESR-A13D-NO2, NO2 Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
ESR-A13D-PH3, PH3 Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
ESR-A13D-SO2, SO2 Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
ESR-A13i-H2S, H2S Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176
ESR-A13P-CO, CO Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178
ESR-A1CP-COH, H
ESR-A1DP-COHS, CO Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182
ESR-A1DP-COHS, H2S Detection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184
ESR-B134-NH3, NH3 Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186
WARNING: Understand manual before operating. Substitution of components may
-Compensated CO Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180
2
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 Pro gas monitor. This chapter also describes the GX-3R Pro Operator’s Manual (this document). Table 1 at the end of this chapter lists the specifications for the GX-3R Pro.

About the GX-3R Pro

Using an advanced detection system consisting of up to four gas sensors, the GX-3R Pro personal five-gas monitor detects the presence of combustible gas, oxygen (O2), carbon
monoxide (CO), hydrogen sulfide (H2S), and CO2 or a super toxic gas simultaneously. The GX-3R Pro’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 Pro offers a full range of features, including:
Simultaneous monitoring of one to five 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 4 on page 9)
WARNING: The Model GX-3R Pro 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 Pro, 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 Pro as described in this manual.
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Specifications

Table 1: Standard Sensor Specifications
Combustible Gas,
Methane (CH
Calibration Standard*
Detection Range 0 - 100% LEL 0 - 25.0% volume 0 - 100.0 ppm 0 - 500 ppm
Service Range n/a 25.1 - 40.0% volume 100.1 - 200.0 ppm 501 - 2,000 ppm
Reading
Increment
War nin g
Setpoint
Alarm
Setpoint
Alarm H
Setpoint
STEL Setpoint n/a n/a 5.0 ppm 200 ppm
TWA Setpoint n/a n/a 1.0 ppm 25 ppm
* The GX-3R Pro 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.
1% LEL 0.1% volume 0.1 ppm 1 ppm
10% LEL 19.5% volume,
25% LEL 18.0% volume,
50% LEL 23.5% volume,
)
4
Oxygen (O
decreasing
decreasing
increasing
)Hydrogen
2
Sulfide (H
5.0 ppm 25 ppm
30.0 ppm 50 ppm
100.0 ppm 1200 ppm
S)
2
Carbon
Monoxide (CO)
Table 2: IR Sensor Specifications
Carbon Dioxide (CO2)
Detection Range 0 - 5.00% volume 0 - 10,000 ppm
Service Range 5.01 - 10.00% volume n/a
Reading
Increment
War nin g
Setpoint
Alarm
Setpoint
Alarm H
Setpoint
STEL Setpoint 3.00% volume n/a
TWA Setpoint 0.50% volume 5,000 ppm
0.01% volume 20 ppm
0.50% volume 5,000 ppm
3.00% volume 5,000 ppm
3.00% volume 5,000 ppm
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Table 3: EC Sensor Specifications
Ammonia
(NH
)
3
Detection Range
and Service Range
Reading
Increment
Warni ng
Setpoint
Alarm
Setpoint
Alarm H
Setpoint
STEL Setpoint 35 ppm 10.0 ppm 1.00 ppm 1.00 ppm 5.00 ppm
TWA Setpoint 25 ppm 4.7 ppm 0.50 ppm 0.30 ppm 2.00 ppm
0 - 400.0 ppm
(parts per million)
0.5 ppm 0.1 ppm 0.05 ppm 0.01 ppm 0.05 ppm
25 ppm 5.0 ppm 2.00 ppm 0.30 ppm 2.00 ppm
35 ppm 10.0 ppm 4.00 ppm 0.60 ppm 5.00 ppm
300 ppm 30.0 ppm 20.0.0 ppm 0.60 ppm 100.00 ppm
Hydrogen
Cyanide (HCN)
0 - 30.0 ppm
(parts per million)
Nitrogen
Dioxide (NO2)
0 - 20.00 ppm
(parts per million)
Phosphine
(PH3)
0 - 20.00 ppm
(parts per million)
Sulfur Dioxide
(SO2)
0 - 100.00 ppm
(parts per million)
Table 4: GX-3R Pro Specifications
Sampling
Method
Diffusion
Response Time T90 within 30 seconds
Display Graphics LCD Display
Max. Distance
for Bluetooth
Connection
Environmental
Conditions
Operating
Temperature &
Humidity
30 feet, unobstructed
• 3000 meter maximum altitude
• Operating pressure: 70 - 120 kPa (70 - 110 kPa for explosion proof)
• Pollution degree 2
•IP 66/68
Continuous environment: -20°C to 50 Temporary environment (up to 15 minutes): -40°C to 60
°
C/Below 90% RH
°
C/Below 95% RH
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Indication
Accuracy for
Detection
Range
Combustible Gas, Catalytic Type Sensor
• Continuous environment (-20°C to 50
°
C): ± 5% of reading or ± 2% LEL (whichever is greater)
• Temporary environment (-40°C to -21°C and 51°C to 60°C): ± 10% LEL
Oxygen
± 0.5% O
2
Hydrogen Sulfide
± 5% of reading or ± 2 ppm H
S (whichever is greater)
2
Carbon Monoxide
± 5% of reading or ± 5 ppm CO (whichever is greater)
Carbon Dioxide (IR)
± 5% of reading or ± 2% of full scale (whichever is greater)
HCN, NH
, NO2, PH3, SO2 (EC)
3
± 10% of reading or ± 5% of full scale (whichever is greater)
Indication
Accuracy for
Service
Range
Oxygen
± 3.0% O
2
Hydrogen Sulfide, Carbon Monoxide, and Carbon Dioxide
± 20% of reading
Safety/
Regulatory
• 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) Alkaline version not verified with CAN/CSA 60079-29-1 & ANSI/ISA 60079-29-1
C US
186718
Power Supply • Lithium ion battery pack (3.7 VDC, 200 mA)
OR
• Alkaline battery pack with 2 AAA batteries (3.0 VDC, 250 mA)
Continuous
Operating
Hours
@ 25 °C in
Measuring
Mode
(Non-Alarm
Operation)
Lithium Ion
Battery Pack
Alkaline Battery
Pack
• Standard 4 gas + super-toxic EC: 25 hours
• Super-toxic EC only: 50 hours
• Standard 4 gas + IR: 16 hours
• IR only: 24 hours
• Standard 4 gas + super-toxic EC: 16 hours
• Super-toxic EC only: 32 hours
• Standard 4 gas + IR: 7 hours
• IR only: 12 hours
Battery
Charger Ratings
Input: 100 - 240 VAC, 47 - 63 Hz, 2.4 A Output: 5.99 VDC, 2A max
Case High-impact Plastic, RF Shielded, Dust and Weather Proof (IP66/68)
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Included
Accessories
• Alligator clip
• Rubber boot
• Wrist strap
• Calibration cup
• Single-unit charger (included with Li-ion versions only)
Other
Accessories
Dimensions and
Weigh t
• 12 VDC charger
• 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)
Lithium Ion Battery Pack Version Approximately 65(H) x 73(W) x 26(D) mm (2.6”H x 2.9”W x 1.0”D) Approximately 120 g (4.2 oz.) Alkaline Battery Pack Version Approximately 65(H) x 73(W) x 34(D) mm (2.6”H x 2.9”W x 1.3”D) Approximately 140 g (4.9 oz.)

About this Manual

The GX-3R Pro 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 Pro
POWER
MODE
AIR
BackFront
LCD
Alarm
LEDs
Buzzer
Opening
Charging Socket
Sensor
Retainer
Bottom Cover
Threaded
Inserts
CO/H2S LEL O2TOXIC
Figure 1: Component Location

Overview

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

Instrument Description

Case

The GX-3R Pro’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
A digital LCD (liquid crystal display) is visible through a clear plastic window in the top case. The LCD simultaneously shows the gas reading for all installed sensors. The LCD also shows information for each of the GX-3R Pro’s operating modes.
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Control Buttons

Two control buttons, AIR and POWER MODE are located below the LCD.
Table 5: GX-3R Pro 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 Pro’s fresh air reading)
• changes the value of a parameter available for adjustment
• scrolls through parameter options
POWER MODE • turns the GX-3R Pro on and off
• turns on LCD backlight
• enters and scrolls through Display Mode
• enters instructions into the GX-3R Pro’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

Five sets of red alarm LEDs (light emitting diodes) 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 Pro’s many display and adjustment options.

Vibrator

A vibrating motor inside the GX-3R Pro case vibrates for gas alarms, unit malfunctions, and as an indicator during normal use of the various modes of the GX-3R Pro.
NOTE: If STEALTH is set to ON, the vibrator only functions when VIBRATION in the
STEALTH Gas Select Mode item is set to ON. See “Stealth and Vibrator Settings
(STEALTH)” on page 167.

Sensors

The GX-3R Pro uses four sensors to monitor up to 5 gases simultaneously. The sensor retainer and bottom cover hold the sensors in place. 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 Pro’s circuitry amplifies the current, converts the current to a gas concentration, and displays the
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concentration on the LCD. The standard calibration for the combustible gas sensor is to methane but the sensor will still
detect and respond to a variety of combustible gases.
O2/CO/H2S/Super Toxic Sensors
The O2, CO, H2S, and super toxic 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 Pro’s circuitry amplifies the current, converts the current to a gas concentration, and displays the concentration on the LCD.
There are 4 different types of CO and H
S sensors available:
2
CO only (ESR-A13P-CO): A single electrochemical cell that detects CO.
•H
compensated CO (ESR-A1CP-CO-H): A single electrochemical cell that detects CO.
2
This sensor does not respond to or responds minimally to hydrogen (displays H2 RICH once H2 concentration reaches 2000 ppm).
•H
•CO/H
S only (ESR-A13i-H2S): A single electrochemical cell that detects H2S.
2
S (ESR-A1DR-COHS): A combination electrochemical cell that detects both CO
2
and H
S.
2
IR Sensors
The infrared sensors detect CO
in the ppm and %volume ranges. Gas enters the sensor
2
through an opening on its face. Infrared light shines through the gas and into an infrared detector. The intensity of the infrared light changes with the gas concentration and this change is converted to an electrical signal. The GX-3R Pro’s circuitry converts the signal into a gas concentration and displays the gas concentration on the LCD.
Dummy Sensors
A dummy sensor is installed in any units that have less than 4 sensors. Dummy sensors are factory installed. The flat side of the dummy sensor faces away from the GX-3R Pro and the hollow side faces toward the GX-3R Pro.

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 H 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 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.
S in the
2
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 H
S
2
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,
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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 and PH3 Sensors’ Humidity Filter (White)
A white humidity filter is placed into a recess in the filter gasket over the H (if an H
S or PH3 sensor is installed). The filter absorbs humidity in the sampling
2
S or PH3 sensor
2
environment to prevent unstable readings around 0 ppm. “H2S” and “PH3” are printed on the side of the filter.
•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 alarm setpoint, the filter does not necessarily ever need to be replaced.
•PH3: The filter should be replaced every 6 months.
NO2 and SO2 Sensors’ H2S Removal Filter Disk (Tan)
An H2S removal filter disk is placed into a recess in the filter gasket over the NO2 or SO2 sensor (if an NO2 or SO2 sensor is installed). The filter disk prolongs the life of the sensors by preventing H2S in the ambient air from reaching the sensor. The filter should be replaced every 6 months.
HCN Sensor’s H2S Removal Filter Disk (Dark Gray)
An H2S removal filter disk is placed into a recess in the filter gasket over the HCN sensor (if an HCN sensor is installed). The filter disk prolongs the life of the sensors by preventing H2S in the ambient air from reaching the sensor. The filter should be replaced every 6 months.
NH3 Sensor’s Humidity Filter (White)
A white humidity filter is placed into a recess in the filter gasket over the NH3 sensor (if an NH3 sensor is installed). The filter absorbs humidity in the sampling environment to prevent unstable readings around 0 ppm. The filter should be replaced every 6 months. “NH3” is
printed on the side of the filter.
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-3R Pros have a hydrophobic dust filter that is not attached to the filter
gasket. When replacing the hydrophobic dust filter on one of these GX-3R Pros, remove the filter and
the gasket and replace it with a filter gasket/hydrophobic dust
filter assembly.

Infrared Communications Port

An infrared (IR) communications port is located on the top of the case, near the top LEDs. Logged data transmits through the port in standard IrDA protocol. A computer’s infrared port or an IrDA/USB cable connected to a USB port can be used to download data to the GX-3R Data Logger Management Program. See the GX-3R Data Logger Management Program operator’s manual for data logging and downloading instructions.
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Battery Pack

Figure 2: Alligator Clip
Alligator
Clip
The GX-3R Pro is either powered by a rechargeable lithium-ion (Li-ion) battery pack or an alkaline battery pack with 2 AAA batteries (Duracell MN2400 or PC2400). Instruments with a Li-ion battery pack have a charging socket on the back of the instrument. Instruments with an alkaline battery pack have a cover that allows for battery replacement.
The battery icon in the upper right of the LCD shows remaining battery life. A low battery warning activates when the GX-3R Pro detects a low battery voltage. The GX-3R Pro sounds a dead battery alarm when battery voltage is too low for Measuring Mode.
NOTE: Use of batteries or battery chargers not specified by RKI Instruments, Inc. will
compromise the CSA classification and may void the warranty. See pg.100 and pg.102 for more information.
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.

Included Accessories

Alligator Clip

An alligator clip is installed on the back of the GX-3R Pro. The alligator clip can be used to attach the GX-3R Pro to clothing or a belt. Teeth in the alligator clip’s jaws prevent the unit from slipping off. The alligator clip can be rotated to change the instrument’s orientation.

Rubber Boot

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

Wrist Strap

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

Figure 3: Charging Cable
AC Adapter
Charging Plug
Figure 4: Calibration Cup
FRONT
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 Pro on the other end.

Calibration Cup

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 Pro 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 a plug that connects to the GX-3R’s power jack on the other end.

Multi-Unit Charger

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

Figure 5: Belt Clip
Belt Clip
A belt clip makes it easy to hook the GX-3R Pro to a utility belt.

SDM-3R

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

RP-3R

The RP-3R is a pump that draws sample to the GX-3R Pro. 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 Pro.

IrDA Cable

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

7:49
5 SEC NO :AIR LUNCH BREAK
7:49
5 SEC YES :MODE LUNCH BREAK

Overview

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

Start Up

This section explains how to start up the GX-3R Pro, get it ready for operation, and turn it off.
NOTE: The screens illustrated in this section are for a 4-gas + 0 - 10.00% volume CO2 unit.
The screens displayed by your GX-3R Pro may be slightly different.

Turning On the GX-3R Pro

To illustrate certain functions, the following description of the GX-3R Pro start up sequence assumes that the following menu items are turned on: LUNCH BREAK, CAL REMINDER, and BUMP REMINDER in User Mode, and ID DISPLAY and AUTO ZERO 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 BREAK is set to ON (factory setting is OFF, see pg.88), the Lunch Break
Screen appears. The unit counts down from 5 seconds.
a. Continue Accumulating
(TWA) readings from the last time the GX-3R Pro 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 Pro is turned on.
b. Reset Accumulation
(TWA) readings, press and release AIR before the countdown reaches 0.
GX-3R Pro Operator’s Manual Chapter 3: Operation • 19
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: To continue accumulating peak and time-weighted average
: To reset the accumulation of peak and time-weighted average
3 . If CAL REMINDER is set to ON (factory setting) and a calibration is due, the screen
7:49
CONFIRM TO USE USER MODE:MODE NO :AIR CAL DATE PAST
7:49
CANNOT USE USER MODE:MODE
CAL DATE PAST
7:49
NO EFFECT USER MODE:MODE
CAL DATE PAST
that appears next depends on how CAL EXPIRED is set in User Mode (see pg.76). The three possible screens are described below. If a calibration is not due, the instrument displays the number of days left until a calibration is due.
CAL EXPIRED set to
CONFIRM TO USE (factory setting)
LCD
Sound Buzzer sounds double pulsing tone Buzzer sounds double pulsing tone None
Action • Option A, Perform calibration
and release POWER MODE to perform a calibration. The instrument takes you straight to the AUTO CAL CYLINDER A screen in User Mode’s GAS CAL\AUTO CAL item. See pg.62 for calibration instructions.
If the calibration is successful, the screen above will not appear again until the unit is due for calibration. If the calibration is not successful, the screen above will again appear in the startup sequence.
• Option B, Bypass message continue without performing a calibration, press and release AIR.
: To
: Press
The GX-3R Pro 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 CYLINDER A screen in User Mode’s GAS CAL\AUTO CAL item. If you
don’t press POWER MODE, the instru-
ment automatically goes to the AUTO
CAL CYLINDER A screen after 6 sec­onds. See pg.62 for calibration instruc-
tions.
If the calibration is successful, the screen above will not appear again until
the unit is due for calibration. If the cali-
bration is not successful, the screen above will again appear in the startup sequence.
CAL EXPIRED set to
CANNOT USE
• Option A, Perform calibration perform a calibration, press and release POWER MODE. The instrument takes you straight to the AUTO CAL CYLINDER A screen in User Mode’s GAS CAL\AUTO CAL item.
• Option B, Bypass message continue without performing a calibration, wait a few seconds for the instrument to continue with its startup sequence.
CAL EXPIRED set to
NO EFFECT
: To
: To
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4 . If BUMP REMINDER is set to ON (factory setting is OFF) and a bump test is due, the
7:49
CONFIRM TO USE USER MODE:MODE NO :AIR BUMP DATE PAST
7:49
CANNOT USE USER MODE:MODE
BUMP DATE PAST
7:49
NO EFFECT USER MODE:MODE
BUMP DATE PAST
7:49
MM/DD/YYYY 1/14/2019 7:49 DATE
screen that appears next depends on how BUMP EXPIRED is set in User Mode (see pg.81). The three possible screens are described below. If a bump test is not due, the instrument displays the number of days left until a bump test is due.
BUMP EXPIRED set to
CONFIRM TO USE (factory setting)
LCD
Sound Buzzer sounds double pulsing tone Buzzer sounds double pulsing tone None
Action • Option A, Perform bump test
and release POWER MODE to perform a bump test. The instrument takes you straight to the BUMP TEST CYLINDER A screen in the BUMP TEST User Mode item. See pg.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 continue without performing a bump test, press and release AIR.
: To
: Press
The GX-3R Pro cannot be used until a successful bump test is performed. Press and release POWER MODE to perform a bump test. The instrument takes you straight to the BUMP TEST CYLINDER A screen in the BUMP TEST User Mode item. If you don’t press POWER MODE, the instrument automatically goes to the BUMP TEST CYLINDER A screen after 6 seconds. See pg.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.
BUMP EXPIRED set to
CANNOT USE
• Option A, Perform bump test perform a bump test, press and release POWER MODE. The instrument takes you straight to the BUMP TEST CYLINDER A screen in the BUMP TEST User Mode item.
• Option B, Bypass message continue without performing a bump test, wait a few seconds for the instrument to continue with its startup sequence.
BUMP EXPIRED set to
NO EFFECT
: To
: To
5 . The Date/Time Screen appears for a few seconds.
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6 . The Battery Voltage Screen appears for a few seconds. The battery voltage is on the top
7:49
3.7V LATCHING Li-ion
FULL SCALE
7:49
40.0 10.00
O2 % CO2 vol%
100 2000 200.0
CH4 %LEL CO ppm H2S ppm
WARNING
7:49
19.5 0.50
O2 % CO2 vol%
10 25 5.0
CH4 %LEL CO ppm H2S ppm
ALARM
7:49
18.0 3.00
O2 % CO2 vol%
25 50 30.0
CH4 %LEL CO ppm H2S ppm
ALARM H
7:49
23.5 3.00
O2 % CO2 vol%
50 1200 100.0
CH4 %LEL CO ppm H2S ppm
STEL
7:49
3.00
CO2 vol%
200 5.0
CO ppm H2S ppm
TWA
7:49
0.50
CO2 vol%
25 1.0
CO ppm H2S ppm
GAS NAME
7:49
O2 CO2
O2 % CO2 vol%
CH4 CO H2S
CH4 %LEL CO ppm H2S ppm
line. The alarm latching/self-resetting setting is on the second line (see pg.154 for a description of how to change this setting). The battery pack type is on the bottom line.
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 the TWA Alarm Screen.
NOTE: If the combustible gas is set to something other than CH4 or H2 in Gas Select
Mode, the combustible channel is displayed as “HC” and the gas formula for the combustible gas sensor’s target gas appears during startup.
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8 . If ID DISPLAY is set to ON (factory setting is OFF, see pg.155), the User ID Screen
7:49
USER_ID_ 001
USER ID
7:49
STATION_ ID_001
STATION ID
7:49
FAIL
CH4 %LEL
FAIL SENSOR
7:49
YES : MODE NO : AIR AUTO ZERO
appears for a few seconds, followed by the Station ID Screen.
9 . If the GX-3R Pro experiences a sensor failure during start up, the display shows which
sensor failed and the buzzer sounds a double pulsing tone once per second. In the example below, the combustible gas sensor failed.
Press and release POWER MODE to acknowledge the failure and continue. “- - - -” replaces the failed sensor’s gas reading. Replace the failed sensor as soon as possible.
10 . If AUTOZERO is set to ON (factory setting is OFF, see pg.155), the instrument
prompts you to do an auto zero.
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.
a. An auto zero operation sets the combustible gas, H2S, CO, and super toxic channels
to 0 and the OXY channel to 20.9%.
b. If the instrument has a CO2 sensor installed and if CO2AIR SETTING is set to ON
in User Mode, the CO2 channel gets set to 400 ppm (0.04% volume) during an auto zero. If CO2AIR SETTING is set to OFF in User Mode, the CO2 channel is not adjusted during the auto zero.
c. You must press and release POWER MODE 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.
GX-3R Pro Operator’s Manual Chapter 3: Operation • 23
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11 . The combustible gas sensor actually contains 2 separate sensors: a standard catalytic
7:49
LIMITED
HC GAS LIST
7:49
20.9 0.00
O2 % CO2 vol%
0 0 0.0
CH4 %LEL CO ppm H2S ppm
sensor and a backup, poison-resistant sensor that is resistant to sensor poisons like silicone. A LIMITED HC GAS LIST alarm indicates that the standard sensor has a reduced output, possibly due to one or more sensor poisons in the environment, and that the poison-resistant sensor is being used to provide gas readings. The poison-resistant sensor has a limited list of detectable gases. The table shown on pg.40 shows which gases can and cannot be detected after receiving a LIMITED HC GAS LIST alarm.
If your application requires detection of a gas still detectable after a LIMITED HC GAS LIST 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 a LIMITED HC GAS LIST 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 Pro 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 Pro. A demand zero operation sets the combustible gas, H
If the instrument has a CO2 sensor installed and if CO2AIR SETTING is set to ON in User Mode, the CO2 channel gets set to 400 ppm (0.04% volume). If CO2AIR SETTING is set to OFF in User Mode, the CO2 channel is not adjusted during the demand zero.
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 Pro”. 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 Pro sets the
fresh air readings for all channels. Start up is complete and the unit is now ready for
monitoring.
S, CO, and super toxic channels to zero and the OXY channel to 20.9%.
2
24 • Chapter 3: Operation GX-3R Pro Operator’s Manual
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Turning Off the GX-3R Pro

S 7:49
20.9 0.00
O2 % CO2 vol%
0 0 0.0
CH4 %LEL CO ppm H2S ppm
7:49
20.9 0.00
O2 % CO2 vol%
0 0 0.0
CH4 %LEL CO ppm H2S ppm
1 . Press and hold POWER MODE. 2 . TURN OFF appears on the display and the buzzer pulses for about five seconds (if KEY
TONE is set to ON in User Mode). 3 . Release the button when TURN OFF disappears from the display. 4 . If you plan to leave the instrument off for an extended period of time, see pg.112.

Measuring Mode Operation

When the GX-3R Pro completes its startup sequence, it is in Measuring Mode. In Measuring Mode the GX-3R Pro continuously monitors the sampled atmosphere and displays the target gas concentrations. The GX-3R Pro 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 REMINDER 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. Buzzer Icon: The buzzer icon indicates the buzzer volume. Lines in front of the icon indicate a
high buzzer volume. No lines in front of the icon indicates a low buzzer volume. Bluetooth Icon: The Bluetooth icon flashes when the instrument is trying to pair to a phone.
The Bluetooth icon is steadily on when the instrument is paired to a phone. The Bluetooth icon is off when the instrument is not paired and is not trying to pair to a phone.
Backlight: In a low-light environment, press and release either button to turn on the display backlight. See pg.91 to set the backlight time.
Confirmation/Non-Compliance Indicator: If the BEEP menu item in User Mode is set to anything other than OFF, the GX-3R Pro gives periodic indications to confirm that it’s operating or to indicate a non-compliance (see pg.89 for instructions).

Monitoring an Area

1 . Start up the GX-3R Pro as described above in “Start Up” on page 19. It is now in
Measuring Mode.
2 . Take the GX-3R Pro 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 concentration(s) present.
If you are sampling with an aspirator adapter, see pg.29.
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4 . If a gas alarm occurs, take appropriate action. See pg.32. 5 . Do not expose the GX-3R Pro to rain. 6 . The GX-3R Pro’s IP 66/68 ratings do not imply that the GX-3R Pro will detect gas
during and after exposure to those conditions. If exposure occurs, dry the instrument
with a cloth and perform a bump test as described on pg.56. 7 . If the GX-3R Pro gets exposed to flammable liquids:
a. Wipe the instrument off with a cloth dampened with water.
b. Replace the filters as described on pg.104 and pg.106 if they became saturated
c. Perform a bump test as described on pg.56.
8 . If you suspect that the GX-3R Pro is not operating correctly:
a. Take the GX-3R Pro to a fresh air environment and perform a demand zero as
described on pg.24.
b. Perform a bump test as described on pg.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 (CH
calibrated to a different combustible gas, such as hexane or propane, the gas name right above the readings displays as “HC”.
Automatic Conversion
). If the instrument is setup for and
4
The GX-3R Pro can automatically display converted target gas readings if the instrument’s calibrated target gas is methane or isobutane. See “Combustible Sensor Target Gas Conversion (HC GAS LIST)” on page 40.
Manual Conversion
You can manually calculate a converted target gas reading using Table 6 below if the instrument’s calibrated target gas is methane. The table below lists the conversion factors for several hydrocarbon gases if the GX-3R Pro 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 6: LEL Hydrocarbon Conversion Factors
Gas
Acetone 2.22 IPA 1.64
Acetylene 1.43 Isobutane 1.10
Benzene 2.50 MEK 2.63
Butadiene 1.52 Methane 1.00
LEL Conversion Factor
(from CH
Cal.)
4
Gas
LEL Conversion Factor
(from CH4 Cal.)
Cyclopentane 1.45 Methanol 1.82
DME 1.16 MIBK 4.00
Ethane 0.94 MMA 3.33
26 • Chapter 3: Operation GX-3R Pro Operator’s Manual
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Table 6: LEL Hydrocarbon Conversion Factors
Gas
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 CH
Cal.)
4
Gas
LEL Conversion Factor
(from CH4 Cal.)
Overscale Protection
The GX-3R Pro 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.
LIMITED HC GAS LIST 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. A LIMITED HC GAS LIST alarm indicates that the standard sensor has a reduced output, possibly due to one or more sensor poisons in the environment, and that the poison-resistant sensor is being used to provide gas readings. The poison-resistant sensor has a limited list of detectable gases. The table shown on pg.40 shows which gases can and cannot be detected after receiving a LIMITED HC GAS LIST alarm.
If your application requires detection of a gas still detectable after a LIMITED HC GAS LIST 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 a LIMITED HC GAS LIST alarm (like methanol or ethanol), you must replace the combustible gas sensor as soon as possible.
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Oxygen-Enriched Atmospheres

The GX-3R Pro is not intended for use in oxygen-enriched atmospheres.
WARNING: Do not use the GX-3R Pro 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 the H2 concentration rises above
2000 ppm.

Interference Information

Some gases interfere with CO, H2S, and super toxic sensors. For a complete list of these gases, see pg.170.

CO2 Detection

A background level of CO2 exists in fresh air. Table 7 below indicates a typical gas
reading in fresh air.
Table 7: Carbon Dioxide Fresh Air Readings
Sensor Range
0 - 10.00% volume 0.04% volume
0 - 10,000 ppm 400 ppm
Approximate Fresh Air
Reading
Performing a demand zero, an auto zero, or an AIR CAL will either set to CO2 channel to
400 ppm (0.04% volume) or exclude the CO2 channel based on the setting of the CO2AIR SETTING User Mode parameter. See pg.94 for more information.
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Aspirator Adapter Sampling

Probe
Hose
Aspirator Bulb
CO/H
2
S LEL O
2
TOXIC
GX-3R Pro
AIR
POWER
MODE
FRONT
Sample Cup
Figure 6: GX-3R Pro 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 Pro does not
include the aspirator adapter.
1 . Turn on the GX-3R Pro as described on pg.19. 2 . Attach the sample cup to the GX-3R Pro. Use the label and imprinting to make sure that
the sample cup gets installed in the correct orientation relative to the GX-3R Pro. Be sure
the sample cup is pushed on all the way. 3 . Screw the probe onto the threaded end of the hose. 4 . Attached the hose and probe to the aspirator bulb. 5 . Insert the end of the probe into the area to be sampled. 6 . Squeeze and release the aspirator bulb 15 times. 7 . Monitor the readings and note if any alarms occur. The readings will peak shortly after
the last squeeze and may decrease before all the channels can be checked. Use the Peak
screen in Display Mode to see the maximum readings for each channel (see pg.39).
NOTE: The peak readings for each channel are saved until a higher peak is recorded, the
peak readings are reset, or the instrument is turned off. If a gas is present but the level does not exceed the previous peak level, the previous peak will be displayed on the Peak Screen.
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Alarms

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

Alarm Indications

The GX-3R Pro buzzer sounds an alarm, the LEDs flash, and the vibrator pulses when any sort of alarm condition or failure occurs. If the GX-3R Pro is operating in Stealth Mode, the buzzer does not sound and the vibrator’s operation depends on the VIBRATION setting in Gas Select Mode’s STEALTH menu item. See pg.167 for more information.
NOTE: If an alarm condition occurs while you are in Display Mode, the GX-3R Pro
automatically returns to the Measuring Mode screen.
The table below summarizes the GX-3R Pro’s alarm types and indications. None of the Man Down alarm indications occur if MAN DOWN is set to OFF (factory
setting) in User Mode. The Panic alarm does not occur if PANIC is set to OFF (factory setting) in User Mode.
Table 8: Alarm Types and Indications
Alarm Type Visual Indications Other Indications
Warni ng
Concentration of gas rises above the Warning setting or falls below the Warning setting for O
Alarm
Concentration of gas rises above the Alarm setting or falls below the Alarm setting for O
Alarm H
Concentration of gas rises above the Alarm H setting.
.
2
.
2
• Affected channel’s gas reading flashes and the units field alternates between the units and AL1
• Alarm LEDs flash in circle sequence once per second
• Backlight turns on
• Affected channel’s gas reading flashes and the units field alternates between the units and AL2
• Alarm LEDs flash in circle sequence twice per second
• Backlight turns on
• Affected channel’s gas reading flashes and the units field alternates between the units and AL3
• Alarm LEDs flash in circle sequence twice per second
• Backlight turns on
• High-low tone sounding once per second
• Vibrator pulses once per second
• High-low tone sounding twice per second
• Vibrator pulses twice per second
• High-low tone sounding twice per second
• Vibrator pulses twice per second
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Table 8: Alarm Types and Indications
Alarm Type Visual Indications Other Indications
TWA or STEL
Concentration of CO, H
super toxic gas rises above the TWA or STEL alarm setting.
H2 RICH (for GX-3R Pros with H
compensated CO sensor)
Concentration of hydrogen rises above 2000 ppm (parts per million).
Over Range • Affected channel’s gas reading is
Minus Over Range • Affected channel’s gas reading is
S, CO2, or
2
• Affected channel’s gas reading flashes and the units field alternates between the units and TWA or STEL.
• Alarm LEDs flash in circle sequence once per second
• Backlight turns on
H2 and RICH alternate in the lower
-
2
right corner
• Alarm LEDs flash twice per second
• Backlight turns on
replaced by flashing OVER and the units field alternates between the units and OVER.
• Alarm LEDs flash in circle sequence twice per second
• Backlight turns on
replaced by flashing -OVER and the units field alternates between the units and MOVER.
• Alarm LEDs flash in circle sequence twice per second
• Backlight turns on
• High-low tone sounding once per second
• Vibrator pulses once per second
• High-low tone sounding twice per second
• Vibrator pulses twice per second
• High-low tone sounding twice per second
• Vibrator pulses twice per second
• High-low tone sounding twice per second
• Vibrator pulses twice per second
Low Battery Warning • The last bar in the battery icon starts
flashing
Dead Battery Alarm • Gas readings disappear and FAIL
BATTERY appears at the bottom of
the LCD
• Alarm LEDs flash once per second
Sensor Failure FA IL SENSO R appears at the
bottom of the LCD and the failed sensor(s) are indicated with FAIL under the gas name.
• Alarm LEDs flash once per second
LIMITED HC GAS LIST LIMITED HC GAS LIST appears
on the screen
• Alarm LEDs flash once per second
Clock Failure FAIL CL O CK appears at the bottom
of the LCD
• Alarm LEDs flash once per second
None
Double pulsing tone once per second
Double pulsing tone once per second
Double pulsing tone once per second
Double pulsing tone once per second
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Table 8: Alarm Types and Indications
Alarm Type Visual Indications Other Indications
System Failure • FAIL SYSTEM appears at the
bottom of the LCD and an error code displays in the middle of the LCD
• Alarm LEDs flash once per second
Man Down Warning 1
The WARNING 1 TIME defined in User Mode has passed since the instrument detected movement.
Man Down Warning 2
The WARNING 2 TIME defined in User Mode has passed since the instrument detected movement.
Man Down Alarm
The ALARM TIME defined in User Mode has passed since the instrument detected movement.
Panic
User double taps the instrument.
Pre Alarm
Main Alarm
• Alarm LEDs flash once per second Single pulsing tone once per
• Alarm LEDs flash twice per second Single pulsing tone twice per
MAN DOWN appears at the bottom of the LCD and the gas readings disappear
• Alarm LEDs flash in circle sequence twice per second
• Backlight turns on
• Screen unaffected for 5 seconds
• Alarm LEDs flash twice per second
PANIC appears at the bottom of the LCD and the gas readings disappear
• Alarm LEDs flash in circle sequence twice per second
• Backlight turns on
Double pulsing tone once per second
second
second
• High-low tone sounding twice per second
• Vibrator pulses twice per second
• Single pulsing tone twice per second for 5 seconds
• High-low tone sounding twice per second
• Vibrator pulses twice per second

Responding to Alarms

This section describes response to gas, over range, battery, sensor failure, LIMITED HC GAS LIST, clock failure, system failure, man down, and panic alarms.
Responding to Gas Alarms
1 . Determine which gas alarm has been activated. 2 . Follow your established procedure for an increasing gas condition or a decreasing
oxygen condition.
3 . Reset the alarm as necessary or allowed.
a. If LATCHING is set to ON (factory setting) in Maintenance Mode, the gas reading
must fall below (or rise above for an oxygen low alarm) an alarm setting before you can reset the alarm condition using POWER MODE or AIR.
b. If LATCHING is set to OFF in Maintenance Mode, the alarm condition
automatically resets when the 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).
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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 Pro 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. 2 . Follow your established procedure for an extreme gas condition. 3 . If LATCHING is set to ON (factory setting) in Maintenance Mode, reset the alarm
using POWER MODE or AIR once the alarm condition clears. 4 . Calibrate the GX-3R Pro as described on pg.62. 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 Pro is not operational as a gas monitoring device during a dead
battery alarm. Take the Model GX-3R Pro to a non-hazardous area and replace or recharge the batteries as described on pg.100 and pg.102.
The GX-3R Pro is fully functional during a low battery warning. Proper instrument operation is only guaranteed for 10 minutes but the instrument will operate for 1-2 hours after the start of the alarm.However, only 1-2 hours of operating time remains. The amount of operating time left depends on LCD backlight use and the alarm frequency. Recharge the Li-ion battery pack (pg.102) or replace the alkaline batteries (pg.100) as soon as possible.
NOTE: Alarms and the LCD backlight consume battery power and reduce the amount of
operating time remaining.
Responding to Sensor Failure Alarms
1 . Determine which sensor triggered the sensor failure alarm. 2 . Calibrate the failed sensor, as described on pg.62. 3 . If the sensor failure continues or if the sensor could not be calibrated, replace the sensor
as described on pg.107 4 . If the sensor failure condition continues, contact RKI Instruments, Inc. for further
instructions.
GX-3R Pro Operator’s Manual Chapter 3: Operation • 33
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Responding to a LIMITED HC GAS LIST Alarm
7:49
FAIL CLOCK
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. A LIMITED HC GAS LIST alarm indicates that the standard sensor has a reduced output, possibly due to one or more sensor poisons in the environment, and that the poison-resistant sensor is being used to provide gas readings. The poison-resistant sensor has a limited list of detectable gases. The table shown on pg.40 shows which gases can and cannot be detected after receiving a LIMITED HC GAS LIST alarm.
If your application requires detection of a gas still detectable after a LIMITED HC GAS LIST 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 a LIMITED HC GAS LIST 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 pg.112 for storage information.
1 . Press and release POWER MODE to continue into Measuring Mode.
CAUTION: If you operate the instrument after a clock failure, data will still be logged but
the date/time will be incorrect. Set the date/time as described on pg.94 as soon as possible to ensure logged data uses the correct date/time.
2 . Attempt to set the date using the DATE User Mode menu item as described on pg.94. 3 . If the date cannot be set correctly, contact RKI Instruments, Inc. as soon as possible.
34 • Chapter 3: Operation GX-3R Pro Operator’s Manual
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Responding to System Failure Alarms
7:49
031
FAIL SYSTEM
1 . If a system failure occurs, an error code displays as shown below:
2 . The error code meanings are shown in the table below:
Table 9: 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
083 Bluetooth failure
3 . If the error code is anything but 031, the instrument cannot be used. Contact RKI
Instruments, Inc. as soon as possible.
If the error code is 031, 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.
Responding to a Man Down Warning 1 and Warning 2
The Man Down Warning 1 and Warning 2 alarms occur after the WA R N I N G 1 TI M E and WARNING 2 TIME, respectively, has passed since the last movement of the instrument. See
pg.84 for instructions to change these values. 1 . Follow your established procedure for a man down warning. 2 . To silence the alarm and reset the Man Down clock, move the instrument or press and
release POWER MODE.
Responding to a Man Down Alarm
The Man Down Alarm alarms occur after the ALARM TIME has passed since the last movement of the instrument. See pg.84 for instructions to change this value.
1 . Follow your established procedure for a man down alarm. 2 . To silence the alarm and reset the Man Down clock, press and release POWER MODE
or AIR. Moving the instrument will not reset the alarm or Man Down clock.
GX-3R Pro Operator’s Manual Chapter 3: Operation • 35
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Responding to a Panic Alarm
If the user is in a dangerous situation or feels that others must be alerted to any sort of problem, forcefully tapping the instrument twice will initiate a panic alarm.
1 . Press and release POWER MODE or AIR to silence and reset the alarm.

Data Logging

The GX-3R Pro 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 Pro’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 Pro. 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 Pro. The GX-3R Data Logger
Management Program is available at. The USB/IrDA
adapter cable is available from RKI Instruments, Inc. The data logging capacity depends on how often the GX-3R Pro stores data, how many
channels are active, and how often the GX-3R Pro 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 four 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 10: Data Logging Capacity
Interval Time Data Logging Time
10 seconds 10 hours
20 seconds 20 hours
30 seconds 30 hours
1 minute 60 hours
3 minutes 180 hours
5 minutes (factory setting) 300 hours
10 minutes 600 hours
For a complete description of the Data Logger Management Program and procedures for downloading data to a computer, see the GX-3R Data Logger Management Program Operator’s Manual.
36 • Chapter 3: Operati on GX-3R Pro Operator’s Manual
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Chapter 4: Display Mode

This section describes Display Mode which is accessible from Measuring Mode. See Table 11 below for a list of Display Mode’s menu items, a short description of each item, and the page number for further description.
Table 11: Display Mode Menu Items
Display Mode
Menu Item
PEAK (pg.39) Displays each sensor’s Peak reading.
STEL (pg.39) Displays the STEL readings (CO, H
TWA (pg.40) Displays the TWA readings (CO, H
HC GAS LIST
A
(pg.40)
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)
Description
S, and CO2/super toxic only).
2
S, and CO2/super toxic only).
2
• C6H6 (benzene)
• n-C6H14 (hexane)
• C7H8 (toluene)
• n-C7H16 (heptane)
• C8H10 (xylene)
• n-C9H20 (nonane)
• EtAc (ethyl acetate)
• IPA (isopropyl alcohol)
• MEK (methyl ethyl ketone)
• MMA (methyl methacrylate)
• DME (dimethyl ether)
• MIBK (methyl isobutyl ketone)
• THF (tetrahydrofuran)
USER ID
C
(pg.42)
STATION ID
C
(pg.43)
CAL DATA
D
(pg.43)
BUMP DATA
E
(pg.44)
DATE (pg.45) Displays the current date, time, and temperature.
ALARM POINTS (pg.46)
INVERT SELECT
B
(pg.47)
View and/or change the User ID.
View and/or change the Station ID.
Displays the last calibration date for each sensor.
Displays the last bump test date for each sensor.
View alarm points
ON: The LCD stays upside down relative to the instrument. AUTO: The LCD automatically flips as the instrument is rotated to remain readable
whether the instrument is right side up or upside down. OFF (factory setting): The LCD stays right side up relative to the instrument.
GX-3R Pro Operator’s Manual Chapter 4: Display Mode • 37
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Table 11: Display Mode Menu Items
Display Mode
Menu Item
LCD BACK-
GROUND
B
(pg.47)
BLUETOOTH
B
(pg.48)
BUZZER VOLUME
B
(pg.48)
LANGUAGE
F
(pg.49)
A
Only appears if D MODE SETTING 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 D MODE SETTING is set to ON in User Mode (factory setting).
C
Only appears if D MODE SETTING is set to ON in User Mode (factory setting) and if ID DISPLAY is
set to ON in Maintenance Mode (factory setting is OFF).
D
Only appears if CAL REMINDER is set to ON in User Mode (factory setting).
E
Only appears if BUMP REMINDER is set to ON in User Mode (factory setting is OFF).
F
Only appears if LANGUAGE is set to something other than ENGLISH in Maintenance Mode.
ON: LCD has black background with white characters. OFF (factory setting): LCD has white background with black characters.
ON: Turns Bluetooth functionality on. OFF (factory setting): Turns Bluetooth functionality off.
HIGH (factory setting): Buzzer volume is high. LOW: Buzzer volume is low.
Change the language of the instrument back to English if something other than English was selected in User Mode.
Description

Tips for Using Display Mode

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, use 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 for 20 seconds, the
GX-3R Pro automatically returns to Measuring Mode.
38 • Chapter 4: Display Mode GX-3R Pro Operator’s Manual
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Peak Screen (PEAK)

PEAK
7:49
18.7 5.50
O2 % CO2 vol%
12 7 23.0
CH4 %LEL CO ppm H2S ppm
7:49
HOLD AIR KEY
PEAK CLEAR
7:49
RELEASE
PEAK CLEAR
STEL
7:49
1.50
CO2 vol%
2 3.0
CO ppm H2S ppm
The peak screen displays the highest (lowest for oxygen) concentrations detected since the GX-3R Pro was turned on. Peak readings are stored in the GX-3R Pro’s memory until a higher level is detected (lower for oxygen), the peak reading is cleared, or the GX-3R Pro is turned off.
The lunch break feature enables the GX-3R Pro to save peak readings when it is turned off so it can continue with the same peaks when it is turned on again. See pg.88 for instructions to turn the lunch break feature on (default is off).
To clear the peak readings, do the following: 1 . While in Display Mode, press and release POWER MODE until PEAK appears.
2 . Press and hold AIR until the screen prompts you to release it.
3 . The peak readings are reset and the unit returns to the Peak Screen.
If you do not want to clear the peak readings, release AIR before the above screen
sequence occurs. The unit returns to the Peak Screen.

STEL Screen (STEL)

The STEL Screen displays the short term exposure limit (STEL) readings for H2S, CO, CO2, and super toxic only. The STEL reading is the average reading over the last 15 minutes.
GX-3R Pro Operator’s Manual Chapter 4: Display Mode • 39
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TWA Screen (TWA)

TWA
7:49
0.75
CO2 vol%
6 5.5
CO ppm H2S ppm
The TWA Screen displays the time weighted average (TWA) readings for H2S, CO, CO2, and super toxic 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 BREAK is set to OFF (factory setting), the TWA is cleared when the GX-3R Pro is turned off.
If LUNCH BREAK is set to ON, the GX-3R Pro will remember TWA readings when it is turned off so it can continue them when it is turned on again. See pg.88 for instructions to turn the lunch break feature on (default is off).

Combustible Sensor Target Gas Conversion (HC GAS LIST)

This screen only appears if D MODE SETTING 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 COMBO item, calibrate with target gas in User Mode’s GAS CAL item).
The HC GAS 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 HC GAS 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 COMBO item and calibrating with that target gas in User Mode.
Selecting a converted target gas in HC GAS 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 HC GAS LIST, the sensor will not respond to the gases listed with an “x” in the “Available Target Gas Conversions During LIMITED HC GAS LIST 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.
40 • Chapter 4: Display Mode GX-3R Pro Operator’s Manual
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Available Converted Target Gases
7:49
CH4 CHANGE : AIR HC GAS LIST
7:49
CH4 NO : MODE HC GAS LIST
Based on Calibrated Target Gas
Gas
CH4 (methane) - x O
i-C4H10 (isobutane) O - O
H2 (hydrogen) O O O
CH3OH (methanol) O O x
C2H2 (acetylene) O O O
C2H4 (ethylene) O O O
C2H6 (ethane) O x O
C2H5OH (ethanol) O O x
C3H6 (propylene) O O O
C3H6O (acetone) O O x
C3H8 (propane) O x O
C4H6 (butyne) O O O
C5H10 (cyclopentane) O O O
C6H6 (benzene) O O x
n-C6H14 (hexane) O O O
C7H8 (toluene) O O x
n-C7H16 (heptane) O O O
C8H10 (xylene) O O x
n-C9H20 (nonane) O O x
EtAc (ethyl acetate) O O x
IPA (isopropyl alcohol) O O x
MEK (methyl ethyl ketone) O O x
MMA (methyl methacrylate) O O x
DME (dimethyl ether) O O x
MIBK (methyl isobutyl ketone) O O x
THF (tetrahydrofuran) O O x
x = not available O = available
(Selected in Gas Select Mode)
CH4 (methane)
i-C4H10
(isobutane)
Available Converted Target Gases During
LIMITED HC GAS
LIST Status
1 . While in Display Mode, press and release POWER MODE until HC GAS LIST
appears. The current setting displays on the top line.
GX-3R Pro Operator’s Manual Chapter 4: Display Mode • 41
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2 . Press and release AIR to enter the screen. A cursor appears to the left of the current gas
7:49
CH4 i-C4H10 H2 HC GAS LIST
7:49
U_ID_002
CHANGE : AIR USER ID
7:49
U_ID_002
NO : MODE USER ID
7:49
U_ID_002
USER ID
selection.
3 . Use AIR to scroll through the list of gases. 4 . With the cursor next to the desired gas, press and release POWER MODE. The
instrument saves the changes and returns to the HC GAS LIST screen. 5 . The gas formula displays at the bottom of the Measuring Mode screen. The gas selection
remains in effect if you turn the instrument off and on again.

User ID Screen (USER ID)

This screen only appears if D MODE SETTING in User Mode is set to ON (factory setting) and
if ID DISPLAY in Maintenance Mode is set to ON (factory setting is OFF).
Use this screen to select a user ID from the 128 user IDs stored in the GX-3R Pro’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 Pro user during a data logging session. User IDs can only be selected in this menu item. You must use the GX-3R Datalogging
Program to edit the 128 user IDs. 1 . After entering Display Mode, press and release POWER MODE until USER ID appears.
2 . To change the User ID, press and release AIR. The current User ID flashes.
3 . Use AIR to scroll to the desired User ID. 4 . Press and release POWER MODE to save the User ID and return to the USER ID screen
in Display Mode.
42 • Chapter 4: Display Mode GX-3R Pro Operator’s Manual
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Station ID Screen (STATION ID)

7:49
S_ID_002
CHANGE : AIR STATION ID
7:49
S_ID_002
NO : MODE STATION ID
7:49
S_ID_002
STATION ID
7:49
YES : AIR NO : MODE CAL DATA
This screen only appears if D MODE SETTING in User Mode is set to ON (factory setting) and if ID DISPLAY in Maintenance Mode is set to ON (factory setting is OFF).
Use this screen to select a station ID from the 128 station IDs stored in the GX-3R Pro’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 Pro location during a data logging session.
User IDs can only be selected in this menu item. You must use the GX-3R Datalogging Program to edit the 128 station IDs.
1 . After entering Display Mode, press and release POWER MODE until STATION ID
appears.
2 . To change the Station ID, press and release AIR. The current Station ID flashes.
3 . Use AIR to scroll to the desired Station ID. 4 . Press and release POWER MODE to save the Station ID and return to the STATION ID
screen in Display Mode.

Last Successful Calibration Date (CAL DATA)

The CAL DATA screen shows the date of each installed sensors’ last successful calibration. This screen only appears if CAL REMINDER is set to ON in User Mode.
1 . While in Display Mode, press and release POWER MODE until CAL DATA appears.
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2 . Press AIR to enter the CAL DATA screen and to scroll through the installed sensors.
AIR
AIR
AIR
7:49
MM/DD/YYYY 10/16/2018 CH4 CAL DATA
7:49
MM/DD/YYYY 10/16/2018 O2 CAL DATA
7:49
MM/DD/YYYY 10/16/2018 H2S CAL DATA
7:49
MM/DD/YYYY 10/16/2018 CO CAL DATA
7:49
MM/DD/YYYY 10/16/2018 CO2 CAL DATA
AIR
AIR
7:49
YES : AIR NO : MODE BUMP DATA
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.

Last Successful Bump Test Date (BUMP DATA)

The BUMP DATA screen shows the date of each installed sensors’ last successful bump test. This screen only appears if BUMP REMINDER is set to ON in User Mode.
1 . While in Display Mode, press and release POWER MODE until BUMP DATA appears.
44 • Chapter 4: Display Mode GX-3R Pro Operator’s Manual
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2 . Press AIR to enter the BUMP DATA screen and to scroll through the installed sensors.
AIR
AIR
AIR
7:49
MM/DD/YYYY 10/16/2018 CH4 BUMP DATA
7:49
MM/DD/YYYY 10/16/2018 O2 BUMP DATA
7:49
MM/DD/YYYY 10/16/2018 H2S BUMP DATA
7:49
MM/DD/YYYY 10/16/2018 CO BUMP DATA
7:49
MM/DD/YYYY 10/16/2018 CO2 BUMP DATA
AIR
AIR
7:49
MM/DD/YYYY 1/14/2019 7:49 DATE 24
°
C
3 . When you are done viewing the last bump test date for the sensors, press and release
POWER MODE to return to the BUMP DATA screen in Display Mode.

Date, Time, Temperature Screen (DATE)

The DATE screen shows the date and time of the instrument and the temperature of the surrounding area.
1 . While in Display Mode, press and release POWER MODE until DATE appears.
GX-3R Pro Operator’s Manual Chapter 4: Display Mode • 45
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Alarm Points Screen (ALARM POINTS)

7:49
YES : AIR NO : MODE ALARM POINTS
AIR
AIR
AIR
AIR
AIR
FULL SCALE
7:49
40.0 10.00
O2 % CO2 vol%
100 2000 200.0
CH4 %LEL CO ppm H2S ppm
WARNING
7:49
19.5 0.50
O2 % CO2 vol%
10 25 5.0
CH4 %LEL CO ppm H2S ppm
ALARM
7:49
18.0 3.00
O2 % CO2 vol%
25 50 30.0
CH4 %LEL CO ppm H2S ppm
ALARM H
7:49
23.5 3.00
O2 % CO2 vol%
50 1200 100.0
CH4 %LEL CO ppm H2S ppm
STEL
7:49
3.00
CO2 vol%
200 5.0
CO ppm H2S ppm
TWA
7:49
0.50
CO2 vol%
25 1.0
CO ppm H2S ppm
AIR
The Alarm Points Screen shows the gas alarm settings for all active channels. 1 . While in Display Mode, press and release POWER MODE until ALARM POINTS
appears.
2 . Press and release AIR to enter the Alarm Points screen. The Full Scale Settings screen
appears and shows full scale settings for each channel. 3 . Use AIR to scroll through the Warning, Alarm, Alarm H, STEL, and TWA settings.
4 . While viewing the alarm settings for a particular alarm point, press and release AIR and
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. 5 . Press and release POWER MODE to return to the ALARM POINTS item in Display
Mode.
46 • Chapter 4: Display Mode GX-3R Pro Operator’s Manual
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Screen Inversion On/Off (INVERT SELECT)

7:49
OFF NO : MODE INVERT SELECT
7:49
OFF CHANGE : AIR INVERT SELECT
7:49
OFF NO : MODE LCD BACKGROUND
7:49
OFF CHANGE : AIR LCD BACKGROUND
The INVERT SELECT screen allows you to turn the screen inversion function on or off. This screen only appears if D MODE SETTING in User Mode is set to ON (factory setting).
ON: The LCD stays upside down relative to instrument. AUTO: The LCD automatically flips to remain readable whether the instrument is right side
up or upside down. OFF (factory setting): The LCD stays right side up relative to the instrument. 1 . While in Display Mode, press and release POWER MODE until INVERT SELECT
appears. The current setting displays on the top line.
2 . Press and release AIR. The current setting flashes. 3 . Use AIR to display the desired setting. 4 . Press and release POWER MODE to save the setting and return to the INVERT
SELECT screen.

LCD Color Scheme (LCD BACKGROUND)

The LCD BACKGROUND screen allows you to change the appearance of the LCD. This screen only appears if D MODE SETTING in User Mode is set to ON (factory setting).
ON: LCD has black background with white characters. OFF (factory setting): LCD has white background with black characters.
1 . While in Display Mode, press and release POWER MODE until LCD BACKGROUND
appears. The current setting displays on the top line.
2 . Press and release AIR. The current setting flashes. 3 . Use AIR to display the desired setting. 4 . Press and release POWER MODE to save the setting and return to the LCD
BACKGROUND screen.
GX-3R Pro Operator’s Manual Chapter 4: Display Mode • 47
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Turning Bluetooth On/Off (BLUETOOTH)

7:49
OFF NO : MODE BLUETOOTH
7:49
OFF CHANGE : AIR BLUETOOTH
7:49
HIGH NO : MODE BUZZER VOLUME
7:49
HIGH CHANGE : AIR BUZZER VOLUME
The BLUETOOTH screen allows you to turn the GX-3R Pro’s Bluetooth functionality on and off. This screen only appears if D MODE SETTING in User Mode is set to ON (factory setting).
ON: Turns Bluetooth functionality on, allowing for connection to the RK Link app on your phone.
If BLE Auto Shut Off When Idle, accessible in the Datalogging or SDM-3R Program, is selected (factory setting) and if the GX-3R Pro does not pair to a phone in the first 5 minutes after startup, the GX-3R Pro’s Bluetooth gets shut off to conserve battery life.
If BLE Auto Shut Off When Idle, accessible in the Datalogging or SDM-3R Program, is deselected and if the GX-3R Pro does not pair to a phone, the GX-3R Pro’s Bluetooth stays on indefinitely.
OFF (factory setting): Turns Bluetooth functionality off. 1 . While in Display Mode, press and release POWER MODE until BLUETOOTH
appears. The current setting displays on the top line.
2 . Press and release AIR. The current setting flashes. 3 . Use AIR to display the desired setting. 4 . Press and release POWER MODE to save the setting and return to the BLUETOOTH
screen.

Adjusting the Buzzer Volume (BUZZER VOLUME)

The BUZZER VOLUME screen allows you to adjust the volume of the instrument’s buzzer. This screen only appears if D MODE SETTING in User Mode is set to ON (factory setting).
HIGH (factory setting): Buzzer volume is high. LOW: Buzzer volume is low.
1 . While in Display Mode, press and release POWER MODE until BUZZER VOLUME
appears. The current setting displays on the top line.
2 . Press and release AIR. The current setting flashes. 3 . Use AIR to display the desired setting. 4 . Press and release POWER MODE to save the setting and return to the BUZZER
VOLUME screen.
48 • Chapter 4: Display Mode GX-3R Pro Operator’s Manual
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Changing Instrument Language Back to English
7:49
LANGUAGE CHANGE TO ENGLISH YES : AIR
7:49
LANGUAGE CHANGE TO ENGLISH NO : MODE
7:49
CHANGE TO ENGLISH
YES : AIR
7:49
CHANGE TO ENGLISH
NO : MODE
(LANGUAGE)
This screen only appears if the LANGUAGE item in Maintenance Mode is set to something other than ENGLISH.
1 . While in Display Mode, press and release POWER MODE until the LANGUAGE
screen appears.
2 . Press and release AIR.
3 . Press and release POWER MODE to confirm that you want to change the language back
to English.
GX-3R Pro Operator’s Manual Chapter 4: Display Mode • 49
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Chapter 5: User Mode and Calibration

Overview

This section describes the GX-3R Pro in User Mode. See Table 12 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 12: User Mode Menu Items
User Mode
Menu Item
BUMP TEST (pg.56)
GAS CAL (pg.62) Perform a fresh air adjustment, perform a span adjustment, change the calibration gas concen-
Perform a bump test.
BUMP TEST CYL X
START MEASURE
ESCAPE Return to BUMP TEST menu item.
tration, set the cylinder group.
AIR CAL (pg.62) Perform a fresh air adjustment.
CO2 ZERO CAL (pg.63)***
AUTO CAL (pg.65)
Perform a bump test on the gases selected for Cylinder X (A-E cylinders available).
Begin the warmup sequence and enter Measuring Mode.
Perform a zero adjustment on the CO
AUTO CAL CYL X
START MEASURE
SETTING CAL-P
Description
channel using 100% nitrogen.
2
Perform an automatic span adjustment on the gases selected for Cylinder X (A-E cylinders available).
Begin the warmup sequence and enter Measuring Mode.
Set the calibration gas concentration for each gas.
CAL SETTING (pg.75)
CYL SETTING
ESCAPE Return to the AUTO CAL menu item.
ESCAPE Return to the GAS CAL menu item.
Change calibration parameters.
CAL REMINDER (pg.76)
CAL INTERVAL (pg.76)
ON
(factory setting): The instrument notifies the user upon startup when a calibration is due. Notification type depends on CAL EXPD setting below.
OFF
: No notification upon startup when a calibration is due.
How often the instrument needs to be calibrated. Options: 1 - 1000 days (factory setting is 90 days)
Assign a cylinder (A-E) to each gas. Multiple gases can be assigned to the same cylinder.
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Table 12: User Mode Menu Items
User Mode
Menu Item
CAL SETTING (cont’d)
BUMP SETTING (pg.78)
Description
CAL EXPIRED (pg.76)
CAL CHECK GAS (pg.77)
ESCAPE Return to the CAL SETTING menu item in User Mode.
Change bump test parameters.
BUMP PARAMETER (pg.78)
Defines what action must be taken if a calibration is due upon startup.
CONFIRM TO USE
edge that calibration is due and continue to Measuring Mode.
CANNOT USE
tion is performed.
NO EFFECT
sequence continues.
ALL GAS
determine if calibration is due.
4 GAS
O
S/CO) are used to determine if calibration is due.
2/H2
GAS TIME How long gas is applied during a bump test.
TOLERANCE Percentage of calibration gas concentration that the
: A screen indicates that calibration is due but warmup
(factory setting): Calibration dates for all gases are used to
: Calibration dates for only the standard 4 gases (combustible gas/
(factory setting): Press and release AIR to acknowl-
: Cannot enter Measuring Mode until a successful calibra-
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 setting)
BUMP REMINDER (pg.80)
BUMP INTERVAL (pg.81)
BUMP EXPIRED (pg.81)
CAL TIME How long gas is applied during a calibration. GAS
TIME is deducted from this time. Options: 90 (factory setting) or 120 seconds
AUTO CAL ON
ESCAPE Return to the BUMP PARAMETER menu item in
ON
: The instrument notifies the user upon startup when a bump test is
due. Notification type depends on BUMP EXPIRED 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 TO USE
edge that bump test is due and continue to Measuring Mode.
CANNOT USE
test is performed.
NO EFFECT
sequence continues.
: A screen indicates that bump test is due but warmup
(factory setting): If a bump test fails, a calibration
automatically starts.
OFF
: If a bump test fails, a calibration does not
automatically start.
BUMP SETTINGS.
(factory setting): Press and release AIR to acknowl-
: Cannot enter Measuring Mode until a successful bump
GX-3R Pro Operator’s Manual Chapter 5: User Mode and Calibration • 51
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Table 12: User Mode Menu Items
User Mode
Menu Item
BUMP SETTING (cont’d)
MAN DOWN (pg.82)
Description
BUMP CHECK GAS (pg.82)
ESCAPE Return to the BUMP SETTING menu item in User Mode.
Turn the man down and panic alarms on and off. Set the intervals for man down alarms.
MAN DOWN (pg.83)
PANIC (pg.83) ON
MAN DOWN TIME (pg.84)
ALL GAS (factory setting): Bump test dates for all gases are used to determine if bump test is due.
4 GAS
: Bump test dates for only the standard 4 gases (combustible gas/
O
S/CO) are used to determine if bump test is due.
2/H2
ON
: Man down alarm is triggered if the instrument does not detect motion during time period defined in WARNING 1 TIME, WARNING 2 TIME, and ALARM TIME below.
OFF
(factory setting): No man down alarm triggered.
: Panic alarm can be triggered.
OFF
(factory setting): Panic alarm cannot be triggered.
ALARM TIME WARNING 2 TIME WARNING 1 TIME
WARNING 1 TIME
WARNING 2 TIME
The amount of time that passes between a man down detection and the first warning alarm. Factory setting is 60 seconds.
The amount of time that passes between a man down
detection and the second warning alarm. Factory set-
ting is 75 seconds.
ALARM SETTING (pg.85)
LUNCH BREAK (pg.88)
ALARM TIME The amount of time that passes between a man down
detection and a man down alarm. Factory setting is 90 seconds.
ESCAPE Return to the MAN DOWN menu item.
Set alarm points for all channels (WARNING, ALARM, ALARM H, STEL, TWA) or reset all alarms to their default settings.
ON
: Lunch break feature is on. At startup, instrument asks if you want to resume TWA and
PEAK readings.
OFF
(factory setting): Lunch break feature is off. Instrument resets TWA and PEAK readings
every time it’s turned on.
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Table 12: User Mode Menu Items
User Mode
Menu Item
CONFIRMATION (pg.89)
Set confirmation beep parameters.
BEEP SELECT (pg.89)
LED
: LEDs flash and instrument vibrates based on interval defined in
BEEP INTERVAL to confirm instrument is still operating. BUZZER
: Buzzer sounds and instrument vibrates based on interval
defined in BEEP INTERVAL to confirm instrument is still operating.
LED+BUZZER
based on interval defined in BEEP INTERVAL to confirm instrument is still operating.
BUMP/CAL VA L if bump test or calibration is due. ALARM ALERT INTERVAL if instrument goes into a gas alarm. BUMP/CAL/ALARM INTERVAL if a) bump test is due, b) calibration is due, or c) instrument
goes into a gas alarm.
OFF
(factory setting): No alerts to confirm instrument is still operating or
that a bump test or calibration are due.
BEEP INTERVAL (pg.90)
Confirmation alert interval. Confirmation type defined in BEEP SELECT. Options: 0.5 minute and 1 to 99 minutes in 1 minute increments. Factory setting is 5 minutes.
Description
: LEDs flash, buzzer sounds, and instrument vibrates
: LEDs flash based on interval defined in BEEP INTER-
: LEDs flash based on interval defined in BEEP
: LEDs flash based on interval defined in BEEP
ESCAPE Return to the CONFIRMATION menu item in User Mode.
AUTO BACKLIGHT (pg.91)
BACKLIGHT TIME (pg.91)
ON
ment.
OFF
How long the back light stays on after the last button press. Options: 0 - 255 seconds or OFF. The factory setting is 30 seconds.
KEY TONE (pg.92) ON
OFF
D MODE SETTING (pg.92)
OFF TOOTH, BUZZER VOLUME, and LANGUAGE items do not appear in Display Mode. ON
BUZZER VOLUME, and LANGUAGE items appear in Display Mode. USER ID and STA-
TION ID screens appear if ID DISPLAY in Maintenance Mode is also set to ON.
ZERO SUPPRESS (pg.93)*
ON
Combustible Gas: 2% LEL O
2
H
2
CO: 2 ppm CO
HCN: 0.5 ppm NH
NO PH SO
(factory setting): The instrument’s backlight automatically turns on in a low light environ-
: The instrument’s backlight does not automatically turn on in a low light environment.
(factory setting): Buzzer sounds when a button is pressed.
: Buzzer does not sound when a button is pressed.
: LIST, USER ID, STATION ID, INVERT SELECT, LCD BACKGROUND, BLUE-
(factory setting): LIST, INVERT SELECT, LCD BACKGROUND, BLUETOOTH,
(factory setting): Not intended for field adjustment. The suppression values are:
: 0.5% volume S: 0.3 ppm
: 0 ppm
2
: 4 ppm
3
: 0.30 ppm
2
: 0.02 ppm
3
: 0.20 ppm
2
GX-3R Pro Operator’s Manual Chapter 5: User Mode and Calibration • 53
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Table 12: User Mode Menu Items
User Mode
Menu Item
ZERO FOLLOWER (pg.93)**
IR UNIT SELECT (pg.93)***
CO2AIR SETTING (pg.94)***
DATE (pg.94) Set the current date and time.
DATE FORMAT (pg.95)
LANGUAGE (pg.95)
USER PA SS W OR D (pg.96)
Not intended for field adjustment. The default setting is ON for every channel except oxygen. Oxygen channel does not support zero follower functionality.
Select the units for the IR CO Options: vol% or ppm
ON
: CO2 channel is set to 400 ppm (0.04% volume) during a demand zero, auto zero, or AIR
CAL. OFF
(factory setting): CO2 channel is not adjusted during a demand zero, auto zero, or AIR
CAL.
MM/DD/YYYY YYYY/MM/DD DD/MM/YYYY
Set the instrument language. Options: English (factory setting), Japanese, Italian, Spanish, German, French, Portuguese, Russian, Korean, Chinese (TC)
ON
: User Mode access is password-protected. Factory-set password is 0405.
OFF
(factory setting): User Mode access is not password-protected.
(factory setting): month/day/year : year/month/day : day/month/year
sensor.
2
Description
ROM/SUM (pg.96) View the firmware information for the GX-3R Pro’s sensor board and main board.
RADIO STANDARD (pg.97)
START MEASURE (pg.98)
* Only appears if DISP ZERO SUP is set to ON in Maintenance Mode. ** Only appears if DISP ZERO FLWR is set to ON in Maintenance Mode. *** Only appears in units with a CO
Approval numbers for radio agencies.
Press and release POWER MODE to begin the warmup sequence and enter Measuring Mode.
sensor installed.
2

Entering User Mode

WARNING: The GX-3R Pro is not in operation as a gas detector while in User Mode.
1 . Take the GX-3R Pro to a non-hazardous location and turn it off if it is on. 2 . Press and hold AIR, then press and hold POWER MODE. Release the buttons when you
hear a beep.
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3 . The screen that appears depends on the setting of User Mode’s USER PASSWORD
USER PASSWORD
set to
OFF USER PASSWORD
set to
ON
MAINTE 7:49
BUMP TEST GAS CAL CAL SETTING USER MODE
MAINTE 7:49
0000
PASSWORD
MAINTE 7:49
BUMP TEST GAS CAL CAL SETTING USER MODE
MAINTE
item. If USER PASSWORD is set to OFF (factory setting), continue with Step 6.
If USER PASSWORD is set to ON, continue with Step 4.
4 . If USER PASSWORD in User Mode is set to ON, a password screen appears and the
first digit flashes.
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 User Mode menu displays.
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.

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.
GX-3R Pro Operator’s Manual Chapter 5: User Mode and Calibration • 55
b. Immediately press POWER MODE and then release both buttons.
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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 TEST)

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 Pro, you will need:
Known calibrating samples of the gases being detected.
Table 13: Calibration Gas 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
Ammonia 8 ppm 400 ppm
Carbon Dioxide (0 - 10,000 ppm) 3,000 ppm 9,000 ppm
Carbon Dioxide (0 - 10.00% vol) 1.00% vol 4.00% vol
Hydrogen Cyanide 0.9 ppm 30.0 ppm
Nitrogen Dioxide 0.50 ppm 20.00 ppm
Phosphine 0.05 ppm 20.00 ppm
Sulfur Dioxide 0.50 ppm 100.00 ppm
A 0.25 LPM fixed flow regulator
Non-absorbent tubing
Min. Cal. Gas
Concentration
Max. Cal. Gas Concentration
Calibration cup
1 . Confirm that the GX-3R Pro’s calibration gas values match the concentrations listed on
the calibration gas cylinder(s) as described on pg.71.
2 . Confirm that your cylinder selections are appropriate as described on pg.73.
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3 . Install the calibration cup onto the GX-3R Pro. Use the label and imprinting to make sure
CO/H2S LEL O2 TOXIC
GX-3R Pro
AIR
POWER
MODE
Inlet
FRONT
Figure 7: Calibration Cup Installation
MAINTE 7:49
BUMP TEST GAS CAL CAL SETTING USER MODE
MAINTE 7:49
12.0
O2 %
50 50 25.0
CH4 %LEL CO ppm H2S ppm
BUMP TEST CYLINDER A
that the calibration cup gets installed in the correct orientation relative to the GX-3R Pro. 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, use AIR to place the cursor next to BUMP TEST.
6 . Press and release POWER MODE. The display shows the gases assigned to Cylinder A
and their assigned calibration values (see pg.71 if the calibration values do not match the calibration gas cylinder’s concentrations).
7 . If necessary, use AIR to scroll to the Bump screen for the gas(es) you want to bump test.
As shipped from the factory, the standard 4 gases (combustible gas, O
, CO, and H2S)
2
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. Toxic sensors are
assigned to Cylinder D or Cylinder E. 8 . Make sure the GX-3R Pro has been turned on for at least 45 seconds before continuing. 9 . For toxic gas cylinders (like cylinders containing H
S), it is important to vent the
2
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.
GX-3R Pro Operator’s Manual Chapter 5: User Mode and Calibration • 57
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10 . With the appropriate Bump screen displayed, press and release POWER MODE.
MAINTE 30
20.9
O2 %
0 0 0.0
CH4 %LEL CO ppm H2S ppm
BUMP TEST APPLY GAS
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
11 . The gas readings flash, the bottom of the screen indicates “BUMP TEST” and “APPLY
GAS”, and the top of the screen counts down from the time defined in BUMP
SETTING\BUMP PARAMETER\GAS TIME.
NOTE: To back out of the gas application screen without performing the bump test, press
and release AIR and POWER MODE together.
12 . At the end of the countdown, the instrument analyzes the results. Follow the flow chart
to determine the bump test outcome.
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Option A from Flow Chart Option B from Flow Chart Option C from Flow Chart
AIR
MAINTE 7:49
P
O2 %
P P P
CH4 %LEL CO ppm H2S ppm
RESULT
MAINTE 7:49
11.9
O2 %
47 47 23.3
CH4 %LEL CO ppm H2S ppm
BUMP TEST
AIR
MAINTE 7:49
P
O2 %
P P P
CH4 %LEL CO ppm H2S ppm
RESULT
MAINTE 7:49
11.9
O2 %
47 47 23.3
CH4 %LEL CO ppm H2S ppm
BUMP TEST
AIR
MAINTE 7:49
P
O2 %
P P P
CH4 %LEL CO ppm H2S ppm
RESULT
MAINTE 7:49
11.9
O2 %
47 47 23.3
CH4 %LEL CO ppm H2S ppm
BUMP TEST
• Bump test passed
• Multiple cylinders assigned
1. The instrument indicates that all channels passed the bump test. Use AIR to scroll between the bump test results and the bump test gas readings.
2. Close the regulator.
3. Press and release POWER MODE to move to the BUMP CYL X screen for the next cylinder.
4. Unscrew the regulator from the first cylinder and screw it into the next cylinder.
5. Repeat Step 9 through Step 12.
6. After the last cylinder is bump tested, press and release POWER MODE to go to the START item in the BUMP menu.
7. Press and release POWER MODE to enter Measuring Mode.
• Bump test passed
• One cylinder assigned
• Auto Start After Successful Bump set to ON (factory setting)
1. The instrument indicates that all
channels passed the bump test. Use AIR to scroll between the bump test results and the bump test gas readings.
2. Close the regulator.
3. Unscrew the regulator.
4. Remove the calibration cup.
5. Press and release POWER MODE to
enter Measuring Mode.
• Bump test passed
• One cylinder assigned
• Auto Start After Successful Bump set to OFF (factory setting is ON)
1. The instrument indicates that all
channels passed the bump test. Use AIR to scroll between the bump test results and the bump test gas readings.
2. Close the regulator.
3. Unscrew the regulator.
4. Remove the calibration cup.
5. Press and release POWER MODE to
return to the START item in the BUMP menu.
6. Press and release POWER MODE to
enter Measuring Mode.
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Option D from Flow Chart Option E from Flow Chart Option F from Flow Chart
AIR
MAINTE 7:49
P
O2 %
P P F
CH4 %LEL CO ppm H2S ppm
RESULT
MAINTE 7:49
11.9
O2 %
47 47 2.0
CH4 %LEL CO ppm H2S ppm
BUMP TEST
MAINTE 60
30 2.0
CH4 %LEL H2S ppm
AUTO CAL APPLY GAS
AIR
AIR
MAINTE 7:49
P
O2 %
F P P F F
CH4 %LEL CO ppm H2S ppm
RESULT
MAINTE 7:49
11.9
O2 %
30 47 2.0
CH4 %LEL CO ppm H2S ppm
BUMP TEST
MAINTE 7:49
47 2.5
CH4 %LEL H2S ppm
AUTO CAL
MAINTE 60
30 2.0
CH4 %LEL H2S ppm
AUTO CAL APPLY GAS
AIR
AIR
MAINTE 7:49
P
O2 %
F P P F P
CH4 %LEL CO ppm H2S ppm
RESULT
MAINTE 7:49
11.9
O2 %
30 47 12.0
CH4 %LEL CO ppm H2S ppm
BUMP TEST
MAINTE 7:49
47 20.5
CH4 %LEL H2S ppm
AUTO CAL
•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 Pro 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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60 • Chapter 5: User Mode and Calibration GX-3R Pro 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. Press and release POWER MODE to enter Measuring Mode.
Option G from Flow Chart Option H from Flow Chart
MAINTE 60
30 2.0
CH4 %LEL H2S ppm
AUTO CAL APPLY GAS
AIR
AIR
MAINTE 7:49
P
O2 %
F P P F P
CH4 %LEL CO ppm H2S ppm
RESULT
MAINTE 7:49
11.9
O2 %
30 47 12.0
CH4 %LEL CO ppm H2S ppm
BUMP TEST
MAINTE 7:49
47 20.5
CH4 %LEL H2S ppm
AUTO CAL
MAINTE 60
30 2.0
CH4 %LEL H2S ppm
AUTO CAL APPLY GAS
AIR
AIR
MAINTE 7:49
P
O2 %
F P P F P
CH4 %LEL CO ppm H2S ppm
RESULT
MAINTE 7:49
11.9
O2 %
30 47 12.0
CH4 %LEL CO ppm H2S ppm
BUMP TEST
MAINTE 7:49
47 20.5
CH4 %LEL H2S ppm
AUTO CAL
•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.
4. Close the regulator.
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GX-3R Pro Operator’s Manual Chapter 5: User Mode and Calibration • 61
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)

MAINTE 7:49
BUMP TEST GAS CAL CAL SETTING USER MODE
MAINTE 7:49
AIR CAL CO2 ZERO CAL AUTO CAL GAS CAL
MAINTE 7:49
20.9
O2 %
0 0 0.0
CH4 %LEL CO ppm H2S ppm
AIR CAL

Calibration Notes

To fully calibrate the standard 4 (combustible gas, O2, CO, H2S) and super toxic sensors, you must do a fresh air adjustment (AIR CAL) and a span adjustment (AUTO CAL).
To fully calibrate the IR CO2 sensor, you must do either a) a fresh air adjustment (AIR CAL) and
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 TEST item or by applying gas in Measuring Mode. The instrument does not need to be calibrated unless it does not pass the User Mode bump test or does not respond appropriately, as defined by the user, in Measuring Mode.
The hydrogen response for the H sensor is replaced.

Performing a Fresh Air Adjustment (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, use AIR to place the cursor next to GAS CAL.
a span adjustment (AUTO CAL) or b) a zero adjustment (CO2 ZERO CAL)
-compensated CO sensor only needs to be set when the
2
3 . Press and release POWER MODE. The Gas Cal menu appears. 4 . Use AIR to place the cursor next to AIR CAL.
5 . Press and release POWER MODE. The example below shows the standard 4 sensors
(combustible gas, O
6 . Make sure the GX-3R Pro has been turned on for at least 45 seconds before continuing.
, CO, H2S).
2
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7 . Press and hold AIR until the screen prompts you to release it.
MAINTE 7:49
HOLD AIR KEY
AIR CAL
MAINTE 7:49
ADJUSTING ZERO
RELEASE
CO/H2S LEL O2TOXIC
GX-3R Pro
AIR
POWER
MODE
Inlet
FRONT
Figure 9: Calibration Cup Installation
8 . If the fresh air adjustment passes, the instrument returns to the Gas Cal menu. 9 . If the fresh air adjustment fails, “FAIL AIR” displays. Press and release POWER MODE
to acknowledge the failure. See “Troubleshooting” on page 99.

Performing a Zero Adjustment on the CO2 Sensor (CO2 ZERO CAL)

Performing a zero adjustment on the CO2 sensor sets the sensor’s zero to a known concentration of CO2 (0 ppm or 0%).
Preparing for a CO2 ZERO CAL
To set the zero reading on the CO
100% nitrogen (N
) cylinder
2
0.25 LPM fixed flow regulator
sensor, you will need:
2
Non-absorbent tubing
Calibration cup
1 . Confirm that the regulator knob is turned all the way clockwise. Screw the 0.25 LPM
fixed flow regulator onto the calibration cylinder.
2 . Install the calibration cup onto the GX-3R Pro. Use the label and imprinting to make sure
that the calibration cup gets installed in the correct orientation relative to the GX-3R Pro. Be sure the calibration cup is pushed on all the way.
3 . Use the tubing to connect the regulator to the inlet of the calibration cup.
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Performing a CO2 ZERO CAL
MAINTE 7:49
BUMP TEST GAS CAL CAL SETTING USER MODE
MAINTE 7:49
AIR CAL CO2 ZERO CAL AUTO CAL GAS CAL
MAINTE 7:49
0.04
CO2 vol%
CO2 ZERO CAL APPLY GAS
1 . While in User Mode, use AIR to place the cursor next to GAS CAL.
2 . Press and release POWER MODE. The Gas Cal menu appears. 3 . Use AIR to place the cursor next to CO2 ZERO CAL.
4 . Make sure the GX-3R Pro has been turned on for at least 45 seconds before continuing. 5 . Press and release POWER MODE. 6 . The CO2 gas reading flashes and the bottom of the screen indicates “CO2 ZERO CAL”
and “APPLY GAS”.
NOTE: To back out of the gas application screen without performing the bump test, press
and release AIR and POWER MODE together.
7 . Turn the regulator knob counterclockwise to open the regulator. 8 . Allow the gas to flow for 1 minute. 9 . Press and release POWER MODE. 10 . Turn the regulator knob clockwise to close the regulator. 11 . If the zero adjustment passed
Gas Cal menu.
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the screen says “PASS” and the instrument returns to the
12 . If the zero adjustment failed:
MAINTE 7:49
FAIL
CO2 vol%
CO2 ZERO CAL
a. “FAIL” replaces the gas reading.
b. The LEDs flash and the buzzer sounds a double pulsing tone.
c. Press and release POWER MODE to clear the failure. The instrument returns to the
GAS CAL menu.
d. See “Troubleshooting” on page 99.
13 . Unscrew the regulator from the calibration cylinder. 14 . Remove the calibration cup from the GX-3R Pro. 15 . Store the calibration kit in a safe and convenient place. 16 . Use AIR to place the cursor next to ESCAPE. 17 . Press and release POWER MODE. The instrument returns to User Mode.

Performing a Span Adjustment in AUTO CAL

Preparing for a Span Adjustment
To perform a span adjustment on the GX-3R Pro, you will need:
Known concentrations of the gases being detected.
Table 14: Calibration Concentration Limits
Channel
Combustible Gas 5% LEL 75% LEL
Oxygen 0.0% 18.0%
Hydrogen Sulfide 1.0 ppm 200.0 ppm
Carbon Monoxide 15 ppm 2,000 ppm
Hydrogen (for H CO sensor); only needs to be done
when sensor is replaced
Ammonia 8 ppm 400 ppm
Carbon Dioxide (0 - 10,000 ppm) 3,000 ppm 9,000 ppm
Carbon Dioxide (0 - 10.00% vol) 1.00% vol 4.00% vol
Hydrogen Cyanide 0.9 ppm 30.0 ppm
Nitrogen Dioxide 0.50 ppm 20.00 ppm
Phosphine 0.05 ppm 20.00 ppm
-compensated
2
Min. Cal.
Concentration
25 ppm 2,000 ppm
Max. Cal.
Concentration
Sulfur Dioxide 0.50 ppm 100.00 ppm
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0.25 LPM fixed flow regulator
CO/H2S LE L O2 TOXIC
GX-3R Pro
AIR
POWER
MODE
Inlet
FRONT
Figure 10: Calibration Cup Installation
MAINTE 7:49
BUMP TEST GAS CAL CAL SETTING USER MODE
MAINTE 7:49
CO2 ZERO CAL AUTO CAL ESCAPE GAS CAL
Non-absorbent tubing
Calibration cup
1 . Confirm that the GX-3R Pro’s calibration gas values match the concentrations listed on
the calibration gas cylinder(s) as described on pg.71. 2 . Confirm that your cylinder selections are appropriate as described on pg.73. 3 . Install the calibration cup onto the GX-3R Pro. Use the label and imprinting to make sure
that the calibration cup gets installed in the correct orientation relative to the GX-3R Pro.
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, use AIR to place the cursor next to GAS CAL.
2 . Press and release POWER MODE. The Gas Cal menu appears. 3 . Use AIR to place the cursor next to AUTO CAL.
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4 . Press and release POWER MODE. The display shows the gases assigned to Cylinder A
MAINTE 7:49
12.0
O2 %
50 50 25.0
CH4 %LEL CO ppm H2S ppm
AUTO CAL CYLINDER A
MAINTE 30
20.9
O2 %
0 0 0.0
CH4 %LEL CO ppm H2S ppm
AUTO CAL APPLY GAS
and the assigned calibration values (see pg.71 if the calibration values do not match the
calibration gas cylinder’s concentrations).
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, the standard 4 gases (combustible gas, O2, CO,
and H2S) 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 H
response. Toxic sensors
2
are assigned to Cylinder D or Cylinder E. 6 . Make sure the GX-3R Pro 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 indicates “AUTO CAL” and
“APPLY GAS”.
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 for all gases except NH3. Allow NH3 gas to flow for
2 minutes. 11 . Press and release POWER MODE.
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12 . Follow the flow chart to determine the calibration outcome.
Figure 11: 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?
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Option A from Flow Chart Option B from Flow Chart
7:49
PASS
AUTO CAL
MAINTE 7:49
11.9
O2 %
47 47 23.3
CH4 %LEL CO ppm H2S ppm
AUTO CAL
MAINTE 7:49
25.0
O2 %
100 70 48.5
CH4 %LEL CO ppm H2S ppm
MAX SPAN
7:49
LIMITED
HC GAS LIST
7:49
PASS
AUTO CAL
MAINTE 7:49
11.9
O2 %
47 47 23.3
CH4 %LEL CO ppm H2S ppm
AUTO CAL
MAINTE 7:49
25.0
O2 %
100 70 48.5
CH4 %LEL CO ppm H2S ppm
MAX SPAN
7:49
LIMITED
HC GAS LIST
• 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 DISP MAX SPAN is set to ON (default is OFF, see pg.166), the response reading’s maximum adjustment displays. 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 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 DISP MAX SPAN is set to ON (default is OFF, see pg.166), the response reading’s maximum adjustment displays. 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 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 HC GAS LIST item become limited. Press and release POWER MODE. See pg.40 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 calibration.
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 HC GAS LIST item become limited. Press and release POWER MODE. See pg.40 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.
9. Repeat Step 9 through Step 12.
10. After the last cylinder is calibrated, the instrument continues to the START MEASURE 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
7:49
PASS
AUTO CAL
MAINTE 7:49
11.9
O2 %
47 47 23.3
CH4 %LEL CO ppm H2S ppm
AUTO CAL
MAINTE 7:49
25.0
O2 %
100 70 48.5
CH4 %LEL CO ppm H2S ppm
MAX SPAN
7:49
LIMITED
HC GAS LIST
MAINTE 7:49
11.9
O2 %
FAIL 47 23.3
CH4 %LEL CO ppm H2S ppm
AUTO CAL
• 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 DISP MAX SPAN is set to ON (default is OFF, see pg.166), the response reading’s maximum adjustment displays. 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 99.
The maximum adjustment is either twice the calibration value or full scale, whichever is lower. The maximum adjustment 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 HC GAS LIST item become limited. Press and release POWER MODE. See pg.40 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 MEASURE item in the AUTO CAL menu.
9. Press and release POWER MODE to enter Measuring Mode.
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Setting the Calibration Values in SETTING CAL--P

MAINTE 7:49
BUMP TEST GAS CAL CAL SETTING USER MODE
MAINTE 7:49
CO2 ZERO CAL AUTO CAL ESCAPE GAS CAL
MAINTE 7:49
SETTING CAL--P
MAINTE
- - - -
CH4 %LEL
SETTING CAL--P
1 . While in User Mode, use AIR to place the cursor next to GAS CAL.
2 . Press and release POWER MODE. The Gas Cal menu appears. 3 . Use AIR to place the cursor next to AUTO CAL.
4 . Press and release POWER MODE. The Auto Cal screen for gases assigned to Cylinder
A displays.
5 . Use AIR to scroll to SETTING CAL--P.
6 . Press and release POWER MODE. The combustible gas channel displays.
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7 . Use AIR to scroll to the channel whose calibration gas value you want to change.
AIR
AIR
AIR
AIR
MAINTE 7:49
- - - -
CH4 %LEL
SETTING CAL--P
MAINTE 7:49
- - - -
O2 %
SETTING CAL--P
AIR
MAINTE 7:49
- - - -
H2S ppm
SETTING CAL--P
MAINTE 7:49
- - - -
CO ppm
SETTING CAL--P
MAINTE 7:49
- - - -
CO2 vol%
SETTING CAL--P
MAINTE 7:49
ESCAPE
8 . Press and release POWER MODE. The calibration gas value begins to flash. In the
example below, the combustible gas channel is selected.
9 . Use AIR to adjust the calibration gas value. The calibration gas value in the instrument
must match the value listed on the calibration gas cylinder you are using for that channel. Limits on the calibration gas value are shown in the table below.
Combustible Gas 5% LEL 75% LEL
Oxygen 0.0% 18.0%
Hydrogen Sulfide 1.0 ppm 200.0 ppm
Carbon Monoxide 15 ppm 2,000 ppm
Hydrogen (for H CO sensor); only needs to be done
when sensor is replaced
Ammonia 8 ppm 400 ppm
Table 15: Calibration Concentration Limits
Channel
Min. Cal.
Concentration
Max. Cal.
Concentration
-compensated
2
25 ppm 2,000 ppm
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Table 15: Calibration Concentration Limits
MAINTE 7:49
BUMP TEST GAS CAL CAL SETTING USER MODE
MAINTE 7:49
CO2 ZERO CAL AUTO CAL ESCAPE GAS CAL
Channel
Carbon Dioxide (0 - 10,000 ppm) 3,000 ppm 9,000 ppm
Carbon Dioxide (0 - 10.00% vol) 1.00% vol 4.00% vol
Hydrogen Cyanide 0.9 ppm 30.0 ppm
Nitrogen Dioxide 0.50 ppm 20.00 ppm
Phosphine 0.05 ppm 20.00 ppm
Sulfur Dioxide 0.50 ppm 100.00 ppm
Min. Cal.
Concentration
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 place the cursor next to ESCAPE. 13 . Press and release POWER MODE. The instrument returns to the SETTING CAL--P
menu item in the Auto Cal Menu. 14 . Use AIR to place the cursor next to ESCAPE. 15 . Press and release POWER MODE. The instrument returns to the GAS CAL menu. 16 . See “Exiting the GAS CAL Menu” on page 75 to return to User Mode.

Making Cylinder Selections in CYL SETTING

The CYL SETTING menu item allows you to group gases together for calibration. As shipped from the factory, the standard 4 gases (combustible gas, O2, H2S, CO) are assigned to
Cylinder A which means all 4 gases are calibrated at once. As shipped from the factory, the hydrogen-compensated CO and toxic gases are assigned to Cylinder D or Cylinder E. There are 5 cylinder assignments available: A, B, C, D, and E. To calibrate each gas separately, assign each gas to a different cylinder (ie. Cylinder A: combustible gas, Cylinder B: O2,
Cylinder C: H2S, Cylinder D: CO, Cylinder E: CO2).
1 . While in User Mode, use AIR to place the cursor next to GAS CAL.
2 . Press and release POWER MODE. The Gas Cal menu appears. 3 . Use AIR to place the cursor next to AUTO CAL.
4 . Press and release POWER MODE. The Auto Cal screen for gases assigned to Cylinder
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A displays.
MAINTE 7:49
CYL SETTING
MAINTE 30
- - - -
CH4 %LEL
CYL SETTING
AIR
AIR
AIR
AIR
MAINTE 7:49
- - - -
CH4 %LEL
CYL SETTING
MAINTE 7:49
- - - -
O2 %
CYL SETTING
AIR
MAINTE 7:49
- - - -
H2S ppm
CYL SETTING
MAINTE 7:49
- - - -
CO ppm
CYL SETTING
MAINTE 7:49
- - - -
CO2 vol%
CYL SETTING
MAINTE 7:49
ESCAPE
5 . Use AIR to scroll to CYL SETTING.
6 . Press and release POWER MODE. The combustible gas channel displays.
7 . Use AIR to scroll to the channel whose cylinder assignment you want to change.
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8 . Press and release POWER MODE. The current setting flashes. In the example below, the
MAINTE 7:49
A
CH4 %LEL
CYL SETTING
MAINTE 7:49
GAS CAL CAL SETTING BUMP SETTING USER MODE
MAINTE 7:49
CAL REMINDER CAL INTERVAL CAL EXPIRED CAL SETTING
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 place the cursor next to ESCAPE. 13 . Press and release POWER MODE. The instrument will return to the CYL SETING
menu item in the Auto Cal Menu. 14 . Use AIR to place the cursor next to ESCAPE. 15 . Press and release POWER MODE to return to 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 “Returning to Measuring Mode (START MEASURE)” on page 98 to enter
Measuring Mode.

Setting Calibration Parameters (CAL SETTING)

The CAL SETTING menu item has 5 items: CAL REMINDER, CAL INTERVAL, CAL EXPIRED, CAL CHECK GAS, and ESCAPE.
1 . While in User Mode, use AIR to place the cursor next to CAL SETTING.
2 . Press and release POWER MODE. The CAL SETTING menu appears.
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CAL REMINDER

MAINTE 7:49
CAL REMINDER CAL INTERVAL CAL EXPIRED CAL SETTING
MAINTE 7:49
CAL REMINDER CAL INTERVAL CAL EXPIRED CAL SETTING
ON (factory setting): The GX-3R Pro gives an indication at start up if it is due for calibration. The type of indication depends on the CAL EXPIRED setting (see pg.76).
OFF: The GX-3R Pro does not give an indication at start up if it is due for calibration. 1 . While in the CAL SETTING menu, use AIR to place the cursor next to CAL
REMINDER.
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 SETTING
menu. 5 . See “ESCAPE” on page 77 to return to User Mode.

CAL INTERVAL

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 . While in the CAL SETTING menu, use AIR to place the cursor next to CAL
INTERVAL.
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 SETTING
menu. 5 . See “ESCAPE” on page 77 to return to User Mode.

CAL EXPIRED

This item defines what indication is given during start up when calibration is due and CAL REMINDER is set to ON.
CONFIRM TO USE (factory setting): The GX-3R Pro gives an indication at start up if
calibration is past due. Press and release AIR to continue without calibrating or POWER MODE to perform a calibration.
CANNOT USE: The GX-3R Pro 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.
NO EFFECT
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.
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: The GX-3R Pro gives an indication at startup if calibration is past due. If
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1 . While in the CAL SETTING menu, use AIR to place the cursor next to CAL
MAINTE 7:49
CAL INTERVAL CAL EXPIRED CAL CHECK GAS CAL SETTING
MAINTE 7:49
CAL EXPIRED CAL CHECK GAS ESCAPE CAL SETTING
EXPIRED.
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 SETTING
menu. 5 . See “ESCAPE” on page 77 to return to User Mode.

CAL CHECK GAS

ALL GAS (factory setting): Calibration dates for all gases are used to determine if calibration is due.
4 GAS
to determine if calibration is due. 1 . While in the CAL SETTING menu, use AIR to place the cursor next to CAL CHECK
: Calibration dates for only the standard 4 gases (combustible gas/O2/H2S/CO) are used
GAS.
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 SETTING
menu. 5 . See “ESCAPE” on page 77 to return to User Mode.

ESCAPE

1 . While in the CAL SETTING menu, use AIR to place the cursor next to ESCAPE. 2 . Press and release POWER MODE. The instrument returns to User Mode. 3 . See “Returning to Measuring Mode (START MEASURE)” on page 98 to return to
Measuring Mode.
GX-3R Pro Operator’s Manual Chapter 5: User Mode and Calibration • 77
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Setting Bump Test Parameters (BUMP SETTING)

MAINTE 7:49
CAL SETTING BUMP SETTING MAN DOWN USER MODE
MAINTE 7:49
BUMP PARAMETER BUMP REMINDER BUMP INTERVAL BUMP SETTING
MAINTE 7:49
BUMP PARAMETER BUMP REMINDER BUMP INTERVAL BUMP SETTING
MAINTE 7:49
GAS TIME TOLERANCE CAL TIME BUMP PARAMETER
The BUMP SETTING menu item has 6 items: BUMP PARAMETERS, BUMP REMINDER, BUMP INTERVAL, BUMP EXPIRED, BUMP CHECK GAS, and ESCAPE.
1 . While in User Mode, use AIR to place the cursor next to BUMP SETTING.
2 . Press and release POWER MODE. The BUMP SETTING menu appears.

BUMP PARAMETER

The BUMP PARAMETER menu item has 5 items: GAS TIME, TOLERANCE, CAL TIME, AUTO CAL, and ESCAPE.
1 . While in the BUMP SETTING menu, use AIR to place the cursor next to BUMP
PARAMETER.
2 . Press and release POWER MODE. The BUMP PARAMETER menu 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 . While in the BUMP SETTING\BUMP PARAMETER menu, use AIR to place the
cursor next to GAS TIME.
2 . Press and release POWER MODE. The current setting flashes. 3 . Use AIR to display the desired setting.
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4 . Press and release POWER MODE to save the setting and return to the BUMP
MAINTE 7:49
GAS TIME TOLERANCE CAL TIME BUMP PARAMETER
MAINTE 7:49
TOLERANCE CAL TIME AUTO CAL BUMP PARAMETER
PARAMETER menu. 5 . See “ESCAPE” on page 80 to return to the BUMP SETTING menu. 6 . See “ESCAPE” on page 82 to return to User Mode.
TOLERANCE
TOLERANCE 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. 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 . While in the BUMP SETTING\BUMP PARAMETER menu, use AIR to place the
cursor next to TOLERANCE.
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
PARAMETER menu. 5 . See “ESCAPE” on page 80 to return to the BUMP SETTING menu. 6 . See “ESCAPE” 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 Pro will only be exposed to gas for an additional 60 seconds. The available values are 90 seconds (factory setting), and 120 seconds.
1 . While in the BUMP SETTING\BUMP PARAMETER menu, use AIR to place the
cursor next to CAL TIME.
2 . Press and release POWER MODE. The current setting flashes. 3 . Use AIR to display the desired setting. 4 . Press and release POWER MODE to save the setting and return to the BUMP
PARAMETER menu. 5 . See “ESCAPE” on page 80 to return to the BUMP SETTING menu. 6 . See “ESCAPE” on page 82 to return to User Mode.
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AUTO CAL
MAINTE 7:49
CAL TIME AUTO CAL ESCAPE BUMP PARAMETER
MAINTE 7:49
CAL TIME AUTO CAL ESCAPE BUMP PARAMETER
MAINTE 7:49
BUMP PARAMETER BUMP REMINDER BUMP INTERVAL BUMP SETTING
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 . While in the BUMP SETTING\BUMP PARAMETER menu, use AIR to place the
cursor next 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 BUMP
PARAMETER menu. 5 . See “ESCAPE” on page 80 to return to the BUMP SETTING menu. 6 . See “ESCAPE” on page 82 to return to User Mode.
ESCAPE
1 . While in the BUMP SETTING\BUMP PARAMETER menu, use AIR to place the
cursor next to ESCAPE.
2 . Press and release POWER MODE. The instrument returns to the BUMP
PARAMETER menu.

BUMP REMINDER

ON: The GX-3R Pro gives an indication at start up if it is due for bump testing. The type of indication depends on the BUMP EXPIRED setting (see pg.81).
(factory setting): The GX-3R Pro does not give an indication at start up if it is due for
OFF
bump testing. 1 . While in the BUMP SETTING menu, use AIR to place the cursor next to BUMP
REMINDER.
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
SETTING menu. 5 . See “ESCAPE” on page 82 to return to User Mode.
80 • Chapter 5: User Mode and Calibration GX-3R Pro Operator’s Manual
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BUMP INTERVAL

MAINTE 7:49
BUMP REMINDER BUMP INTERVAL BUMP EXPIRED BUMP SETTING
MAINTE 7:49
BUMP INTERVAL BUMP EXPIRED BUMP CHECK GAS BUMP SETTING
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. The factory setting is 30 days.
1 . While in the BUMP SETTING menu, use AIR to place the cursor next to BUMP
INTERVAL.
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
SETTING menu. 5 . See “ESCAPE” on page 82 to return to User Mode.

BUMP EXPIRED

This item defines what indication is given during start up when a bump test is due and BUMP REMINDER is set to ON.
CONFIRM TO USE (factory setting): The GX-3R Pro gives an indication at start up if a
bump test is past due. Press and release AIR to continue without bump testing or POWER MODE to perform a bump test.
CANNOT USE: The GX-3R Pro 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.
NO EFFECT: The GX-3R Pro 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 . While in the BUMP SETTING menu, use AIR to place the cursor next to BUMP
EXPIRED.
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
SETTING menu. 5 . See “ESCAPE” on page 82 to return to User Mode.
GX-3R Pro Operator’s Manual Chapter 5: User Mode and Calibration • 81
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BUMP CHECK GAS

MAINTE 7:49
BUMP EXPIRED BUMP CHECK GAS ESCAPE BUMP SETTING
MAINTE 7:49
BUMP EXPIRED BUMP CHECK GAS ESCAPE BUMP SETTING
MAINTE 7:49
BUMP SETTING MAN DOWN ALARM SETTING USER MODE
ALL GAS (factory setting): Bump test dates for all gases are used to determine if bump test is due.
4 GAS: Bump test dates for only the standard 4 gases (combustible gas/O2/H2S/CO) are used to determine if bump test is due.
1 . While in the BUMP SETTING menu, use AIR to place the cursor next to BUMP
CHECK GAS.
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
SETTING menu. 5 . See “ESCAPE” on page 82 to return to User Mode.

ESCAPE

1 . While in the BUMP SETTING menu, use AIR to place the cursor next to ESCAPE.
2 . Press and release POWER MODE. The instrument will return to User Mode. 3 . See “Returning to Measuring Mode (START MEASURE)” on page 98 to return to
Measuring Mode.

Adjusting Man Down and Panic Settings (MAN DOWN)

The MAN DOWN menu item has 4 items: MAN DOWN, PANIC, MAN DOWN TIME, and ESCAPE.
1 . While in User Mode, use AIR to place the cursor next to MAN DOWN.
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2 . Press and release POWER MODE. The MAN DOWN menu appears.
MAINTE 7:49
MAN DOWN PANIC MAN DOWN TIME MAN DOWN MENU
MAINTE 7:49
MAN DOWN PANIC MAN DOWN TIME MAN DOWN MENU
MAINTE 7:49
MAN DOWN PANIC MAN DOWN TIME MAN DOWN MENU

Turning Man Down On/Off

ON: The Man Down alarm is triggered if the instrument detects no motion for the period of time defined in WARNING 1 TIME, WARNING 2 TIME, and ALARM TIME below.
OFF
(factory setting): The Man Down alarm is not triggered.
1 . While in the MAN DOWN menu, use AIR to place the cursor next to MAN DOWN.
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 MAN DOWN
menu. 5 . See “ESCAPE” on page 85 to return to User Mode.

Turning Panic On/Off

ON: A Panic Alarm can be initiated by firmly tapping the instrument twice in a row. OFF (factory setting): A Panic Alarm cannot be initiated.
1 . While in the MAN DOWN menu, use AIR to place the cursor next to PANIC.
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 MAN DOWN
menu. 5 . See “ESCAPE” on page 85 to return to User Mode.
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Setting the Man Down Warning/Alarm Times (MAN DOWN TIME)

MAINTE 7:49
PANIC MAN DOWN TIME ESCAPE MAN DOWN MENU
For all settings:
1) AIR to adjust
2) POWER MODE to save and
MAINTE 7:49
60 SEC
WARNING 1 TIME
MAINTE 7:49
PANIC MAN DOWN TIME ESCAPE MAN DOWN MENU
MAINTE 7:49
90 SEC
ALARM TIME
continue
MAINTE 7:49
75 SEC
WARNING 2 TIME
The Man Down Warning/Alarm times are the amount of time that has to pass between a Man Down detection and each warning/alarm. They can be set in 1 second increments from 10 ­120 seconds. When setting the Man Down Warning/Alarm times, keep in mind that ALARM
TIME WARNING 2 TIME WARNING 1 TIME.
Table 16: Man Down Warning Alarm Time Factory Settings
Warning/Alarm Factory Setting
WARNING 1 TIME 60 seconds
WARNING 2 TIME 75 seconds
ALARM TIME 90 seconds
1 . While in the MAN DOWN menu, use AIR to place the cursor next to MAN DOWN
TIME.
2 . Press and release POWER MODE. The current WARNING 1 TIME setting flashes.
3 . Use AIR to adjust the WARNING 1 TIME. 4 . Press and release POWER MODE to save the setting. 5 . Repeat Step 3 and Step 4 for the WARNING 2 TIME and ALARM TIME settings. 6 . The instrument returns to the MAN DOWN menu.
84 • Chapter 5: User Mode and Calibration GX-3R Pro Operator’s Manual
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7 . See “ESCAPE” on page 85 to return to User Mode.
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ESCAPE

MAINTE 7:49
MAN DOWN ALARM SETTING LUNCH BREAK USER MODE
MAINTE 7:49
- - - -
CH4 %LEL
ALARM SETTING
1 . While in the MAN DOWN menu, press AIR to scroll to ESCAPE. 2 . Press and release POWER MODE. The instrument returns to User Mode. 3 . See “Returning to Measuring Mode (START MEASURE)” on page 98 to return to
Measuring Mode.

Alarm Settings (ALARM SETTING)

The ALARM SETTING menu item has 3 items: ALARM SETTING, DEFAULT ALM-P, and ESCAPE.
1 . While in User Mode, use AIR to place the cursor next to ALARM SETTING.
2 . Press and release POWER MODE. The first channel displays.
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Setting the Alarm Points

AIR
AIR
AIR
AIR
AIR
MAINTE 7:49
- - - -
CH4 %LEL
ALARM SETTING
MAINTE 7:49
- - - -
O2 %
ALARM SETTING
MAINTE 7:49
- - - -
H2S ppm
ALARM SETTING
MAINTE 7:49
- - - -
CO ppm
ALARM SETTING
MAINTE 7:49
- - - -
CO2 vol%
ALARM SETTING
MAINTE 7:49
DEFAULT ALM--P
AIR
MAINTE 7:49
ESCAPE
1 . While in the ALARM SETTING menu, press AIR to scroll 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. The CO channel is selected in the example
MAINTE 7:49
- - - -
CO ppm
ALARM SETTING
For all settings:
1) AIR to adjust
2) POWER MODE to save and continue
MAINTE 7:49
25
CO ppm
TWA
MAINTE 7:49
200
CO ppm
STEL
MAINTE 7:49
1200
CO ppm
ALARM H
MAINTE 7:49
50
CO ppm
ALARM
MAINTE 7:49
25
CO ppm
WARNING
below.
4 . Use AIR to adjust the Warning setpoint. Alarm setpoint limitations are shown below.
Channel Alarm Point Limitations
Combustible Gas
O
2
S
H
2
CO
10,000 ppm
CO
2
CO
10% volume
2
HCN
NH
3
NO
2
PH
3
SO
2
5% LEL WARNING ALARM ALARM H 60% LEL
•0.0% ALARM WARNING 21.8%
• 20.0% ALARM H 40.0%
1.0 ppm WA R N IN G ALARM ALARM H 200.0 ppm
15 ppm WARNING ALARM ALARM H 2000 ppm
3,000 ppm WARNING ALARM ALARM H 9,000 ppm
0.20% volume WARNING ALARM ALARM H 8.00% volume
0.9 ppm WA R N IN G ALARM ALARM H 30.0 ppm
8.0 ppm WA R N IN G ALARM ALARM H 400.0 ppm
0.50 ppm WARNING ALARM ALARM H 20.00 ppm
0.05 ppm WARNING ALARM ALARM H 20.00 ppm
0.50 ppm WARNING ALARM ALARM H 100.00 ppm
GX-3R Pro Operator’s Manual Chapter 5: User Mode and Calibration • 87
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5 . Press and release POWER MODE to save the setting.
MAINTE 7:49
DEFAULT ALM--P
MAINTE 7:49
ALARM SETTING LUNCH BREAK CONFIRMATION USER MODE
6 . Repeat Step 4 and Step 5 for the Alarm, Alarm H, STEL (CO, H2S, CO2, and super toxic
only) and TWA (CO, H2S, CO2, and super toxic only) settings.
7 . The instrument returns to the ALARM SETTING menu. 8 . Repeat Step 1 - Step 7 to change the alarm points for other channels. 9 . See “ESCAPE” on page 88 to return to User Mode.

Defaulting the Alarm Points

Defaulting the alarm points defaults them back to factory settings as outlined in Table 1 on page 8 or to the settings saved in the SAVE ALARM-P menu item in Gas Select Mode if you have performed a SAVE ALARM-P operation.
1 . While in the ALARM SETTING menu, press AIR to scroll to DEFAULT ALM--P.
2 . Press POWER MODE to enter the DEFAULT ALM--P menu item. 3 . Press POWER MODE to perform an alarm default. Press AIR to return to the
DEFAULT ALM--P 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 ALARM SETTING
menu. 5 . See “ESCAPE” on page 88 to return to User Mode.

ESCAPE

1 . While in the ALARM SETTING menu, press AIR to scroll to ESCAPE. 2 . Press and release POWER MODE. The instrument returns to User Mode. 3 . See “Returning to Measuring Mode (START MEASURE)” on page 98 to return to
Measuring Mode.

Updating the Lunch Break Setting (LUNCH BREAK)

OFF (factory setting): The GX-3R Pro 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 Pro was used or start collecting new readings and reset the time in operation.
1 . While in User Mode, use AIR to place the cursor next to LUNCH BREAK.
2 . Press and release POWER MODE. The current setting flashes. 3 . Use AIR to display the desired setting.
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4 . Press and release POWER MODE to save the setting and return to User Mode.
MAINTE 7:49
LUNCH BREAK CONFIRMATION AUTO BACKLIGHT USER MODE
MAINTE 7:49
BEEP SELECT BEEP INTERVAL ESCAPE CONFIRMATION
5 . See “Returning to Measuring Mode (START MEASURE)” on page 98 to return to
Measuring Mode.

Setting the Confirmation Beep and Non-Compliance Indicator (CONFIRMATION)

The CONFIRMATION menu item has 3 items: BEEP SELECT, BEEP INTERVAL, and ESCAPE.
1 . While in User Mode, use AIR to place the cursor next to CONFIRMATION.
2 . Press and release POWER MODE to enter the Confirmation Menu.

BEEP SELECT

BEEP SELECT 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 Pro does not provide a confirmation alert or non­compliance indicator.
LED: The GX-3R Pro’s LEDs double flash as often as defined by the BEEP INTERVAL parameter to verify that the instrument is operating.
BUZZER: The GX-3R Pro’s buzzer double beeps as often as defined by the BEEP INTERVAL parameter to verify that the instrument is operating.
LED+BUZZER as defined by the BEEP INTERVAL parameter to verify that the instrument is operating.
BUMP/CAL: If a bump test or a calibration is due and if BUMP EXPIRED or CAL EXPIRED is set to CONFIRM TO USE or NO EFFECT, the GX-3R Pro’s LEDs double
flash as often as defined by the BEEP INTERVAL parameter to indicate a non-compliance. Once a successful bump test or calibration (depending on which is due) is done, the LEDs stop flashing.
ALARM ALERT: If the instrument goes into any gas alarm, the LEDs double flash as often as defined by the BEEP INTERVAL 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.
: The GX-3R Pro’s LEDs double flash and the buzzer double beeps as often
GX-3R Pro Operator’s Manual Chapter 5: User Mode and Calibration • 89
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BUMP/CAL/ALARM: The LEDs double flash to indicate a non-compliance if any of the
MAINTE 7:49
BEEP SELECT BEEP INTERVAL ESCAPE CONFIRMATION
MAINTE 7:49
BEEP SELECT BEEP INTERVAL ESCAPE CONFIRMATION
following happens.
a. BUMP EXPIRED is set to CONFIRM TO USE or NO EFFECT and a bump test
is due (cleared by successful bump test).
b. CAL EXPIRED is set to CONFIRM TO USE or NO EFFECT 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 non­compliance.
1 . While in the CONFIRMATION menu, use AIR to place the cursor next to BEEP
SELECT.
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 Confirmation
Menu. 5 . See “ESCAPE” on page 91 to return to User Mode.

BEEP INTERVAL

The BEEP INTERVAL parameter defines how often the confirmation alert or non- compliance indicator selected in BEEP SELECT occurs. This setting only applies if the BEEP SELECT 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 CONFIRMATION menu, use AIR to place the cursor next to BEEP
INTERVAL.
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 Confirmation
Menu. 5 . See “ESCAPE” on page 91 to return to User Mode.
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ESCAPE

MAINTE 7:49
CONFIRMATION AUTO BACKLIGHT BACKLIGHT TIME USER MODE
MAINTE 7:49
AUTO BACKLIGHT BACKLIGHT TIME KEY TONE USER MODE
1 . While in the CONFIRMATION menu, use AIR to place the cursor next to ESCAPE. 2 . Press and release POWER MODE. The instrument returns to User Mode. 3 . See “Returning to Measuring Mode (START MEASURE)” on page 98 to return to
Measuring Mode.

Auto Backlight in Low Light (AUTO BACKLIGHT)

The GX-3R Pro has a luminescence sensor that allows the instrument to detect how bright an environment is.
ON (factory setting): The instrument’s backlight automatically turns on in a low light environment.
OFF: The instrument’s backlight does not automatically turn on in a low light environment. 1 . While in User Mode, use AIR to place the cursor next to AUTO BACKLIGHT.
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 User Mode. 5 . See “Returning to Measuring Mode (START MEASURE)” on page 98 to return to
Measuring Mode.

Updating the Backlight Time (BACKLIGHT 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, use AIR to place the cursor next to BACKLIGHT 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 User Mode. 5 . See “Returning to Measuring Mode (START MEASURE)” on page 98 to return to
Measuring Mode.
GX-3R Pro Operator’s Manual Chapter 5: User Mode and Calibration • 91
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Turning the Key Tone On/Off (KEY TONE)

MAINTE 7:49
BACKLIGHT TIME KEY TONE D MODE SETTING USER MODE
MAINTE 7:49
KEY TONE D MODE SETTING IR UNIT SELECT USER MODE
ON (factory setting): The instrument will beep when a button is pressed. OFF: The instrument will not beep when a button is pressed.
1 . While in User Mode, use AIR to place the cursor next to KEY TONE.
2 . Press and release POWER MODE. The current setting flashes. 3 . Use AIR to display the desired setting. 4 . Press and release POWER MODE to save the setting and return to User Mode. 5 . See “Returning to Measuring Mode (START MEASURE)” on page 98 to return to
Measuring Mode.

Display Mode Items (D MODE SETTING)

OFF: HC GAS LIST, USER ID, STATION ID, INVERT SELECT, LCD BACKGROUND, BLUETOOTH, BUZZER VOLUME, and LANGUAGE items do not
appear in Display Mode.
ON (factory setting): HC GAS LIST, INVERT SELECT, LCD BACKGROUND, BLUETOOTH, BUZZER VOLUME, and LANGUAGE items appear in Display Mode. USER ID and STATION ID screens appear in Display Mode if ID DISPLAY in
Maintenance Mode is also set to ON (factory setting is OFF). 1 . While in User Mode, use AIR to place the cursor next to D MODE SETTING.
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 User Mode. 5 . See “Returning to Measuring Mode (START MEASURE)” on page 98 to return to
Measuring Mode.
92 • Chapter 5: User Mode and Calibration GX-3R Pro Operator’s Manual
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Turning Zero Suppression On/Off (ZERO SUPPRESS)

MAINTE 7:49
D MODE SETTING IR UNIT SELECT CO2AIR SETTING USER MODE
This menu item only appears if DISP ZERO SUP is set to ON in Maintenance Mode. The ZERO SUPPRESS setting is not intended for field adjustment. The default setting for
each sensor is ON.
Sensor
Combustible
Gas
O
2
S 0.3 ppm
H
2
CO 2 ppm
CO
2
HCN 0.5 ppm
NH
3
NO
2
PH
3
SO
2
Zero Suppression
Va lu e
2% LEL
0.5% volume
0 ppm
4 ppm
0.30 ppm
0.02 ppm
0.20 ppm

Turning Zero Follower On/Off (ZERO FOLLOWER)

This menu item only appears if DISP ZERO FLWR is set to ON in Maintenance Mode. The ZERO FOLLOWER setting is not intended for field adjustment. The oxygen channel
does not support zero follower functionality. The default setting is ON for all other channels.

Reading Units for IR Sensor (IR UNIT SELECT)

This menu item only appears if a CO2 sensor is installed. IR UNIT SELECT changes the IR sensor’s units.
vol%: CO2 readings displayed in percent volume
ppm: CO2 readings displayed in parts per million
1 . While in User Mode, use AIR to place the cursor next to IR UNIT SELECT.
2 . Press and release POWER MODE. The current setting flashes.
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3 . Use AIR to display the desired setting.
MAINTE 7:49
IR UNIT SELECT CO2AIR SETTING DATE USER MODE
MAINTE 7:49
CO2AIR SETTING DATE DATE FORMAT USER MODE
MAINTE 7:49
MM/DD/YYYY 1/14/2019 7:49 DATE
4 . Press and release POWER MODE to save the setting and return to User Mode. 5 . See “Returning to Measuring Mode (START MEASURE)” on page 98 to return to
Measuring Mode.

CO2 Fresh Air Adjustment On/Off (CO2AIR SETTING)

This menu item only appears if a CO2 sensor is installed.
ON: CO2 channel is set to 400 ppm (0.04% volume) during a demand zero, auto zero, or AIR CAL.
OFF (factory setting): CO2 channel is not adjusted during a demand zero, auto zero, or AIR CAL.
1 . While in User Mode, use AIR to place the cursor next to CO2AIR SETTING.
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 User Mode. 5 . See “Returning to Measuring Mode (START MEASURE)” on page 98 to return to
Measuring Mode.

Setting the Date/Time (DATE)

1 . From the main menu, use AIR to 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 User Mode.
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6 . See “Returning to Measuring Mode (START MEASURE)” on page 98 to return to
MAINTE 7:49
DATE DATE FORMAT LANGUAGE USER MODE
MAINTE 7:49
DATE FORMAT LANGUAGE USER PASSWORD USER MODE
Measuring Mode.

Setting the Date Format (DATE FORMAT)

MM/DD/YYYY (factory setting): month/day/year. YYYY/MM/DD: year, month, day. DD/MM/YYYY: day, month, year.
1 . While in User Mode, use AIR to place the cursor next to DATE FORMAT.
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 User Mode. 5 . See “Returning to Measuring Mode (START MEASURE)” on page 98 to return to
Measuring Mode.

Changing the Instrument Language (LANGUAGE)

The available languages for the GX-3R Pro are: English (factory setting), Japanese, Italian, Spanish, German, French, Portuguese, Russian, Korean, and Chinese (TC).
If you change the language to anything other than English, the LANGUAGE screen appears in Display Mode, allowing you to change the instrument language back to English.
1 . While in User Mode, use AIR to place the cursor next to LANGUAGE.
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 User Mode. 5 . See “Returning to Measuring Mode (START MEASURE)” on page 98 to return to
Measuring Mode.
GX-3R Pro Operator’s Manual Chapter 5: User Mode and Calibration • 95
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Turning the Password On/Off (USER PASSWORD)

MAINTE 7:49
LANGUAGE USER PASSWORD ROM / SUM USER MODE
MAINTE 7:49
0405
USER PASSWORD
MAINTE 7:49
USER PASSWORD ROM / SUM RADIO STANDARD USER MODE
ON: The GX-3R Pro 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, use AIR to place the cursor next to USER 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 USER PASSWORD item in User Mode.
If you selected ON, continue with Step 5. 5 . Press and release POWER MODE. The Set Password Screen appears. The current
password displays and the first digit flashes.
6 . Use AIR to display a number from 0 to 9. 7 . Press and release POWER MODE to enter the selection and advance to the next number.
To go back a number, press and hold AIR and POWER MODE for a few seconds. 8 . Repeat Step 6 and Step 7 to select the remaining numbers. When you press and release
POWER MODE to enter the last number, the password is saved and you return to User
Mode. 9 . See “Returning to Measuring Mode (START MEASURE)” on page 98 to return to
Measuring Mode.

Viewing the ROM/SUM (ROM/SUM)

The ROM/SUM screen shows the instruments’ firmware version and firmware checksum. 1 . While in User Mode, use AIR to place the cursor next to ROM/SUM.
96 • Chapter 5: User Mode and Calibration GX-3R Pro Operator’s Manual
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2 . Press and release POWER MODE. The screen cycles through the main board’s ROM/
MAINTE 7:49
35708 BAB8 ROM/SUM MAIN
MAINTE 7:49
35707 C1E3 ROM/SUM SENSOR
MAINTE 7:49
05672 8EAC ROM/SUM IR SENS
MAINTE 7:49
00.00.21
BLUETOOTH
MAINTE 7:49
ROM / SUM RADIO STANDARD START MEASURE USER MODE
MAINTE 7:49
Contains IC: 4389B-EYSHJN
RADIO STANDARD
Contains FCC ID: RYYEYSHJN
SUM, the sensor board’s ROM/SUM, the IR sensor ROM/SUM (if an IR sensor is
installed), and the Bluetooth version. The ROM is the top value and the SUM is the
bottom value.
3 . Press and release POWER MODE to return to User Mode. 4 . See “Returning to Measuring Mode (START MEASURE)” on page 98 to return to
Measuring Mode.

Viewing the Radio Standards (RADIO STANDARD)

1 . While in User Mode, use AIR to place the cursor next to RADIO STANDARD.
2 . Press and release POWER MODE. The radio standards display.
3 . Press and release POWER MODE to return to User Mode. 4 . See “Returning to Measuring Mode (START MEASURE)” on page 98 to return to
Measuring Mode.
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Returning to Measuring Mode (START MEASURE)

MAINTE 7:49
ROM / SUM RADIO STANDARD START MEASURE USER MODE
1 . While in User Mode, use AIR to place the cursor next to START MEASURE.
2 . Press and release POWER MODE. 3 . The instrument begins its start-up sequence.
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Chapter 6: Maintenance

Overview

This chapter describes troubleshooting procedures for the GX-3R Pro. It also includes procedures for instrument cleaning, replacing and 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 Pro.
Table 17: Troubleshooting the GX-3R Pro
Symptoms Probable Causes Recommended Action
• The LCD is blank. • The unit may have been turned off.
• The batteries may need to be replaced or recharged.
• The LCD shows abnormally high or low readings but other gas detection instruments do not.
• One of the sensor’s filters may need to be replaced.
• The GX-3R Pro 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, replace or recharge the batteries.
3. If the difficulties continue, contact RKI Instruments, Inc. for further instruction.
1. Replace the sensor filter.
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.
GX-3R Pro Operator’s Manual Chapter 6: Maintenance • 99
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Table 17: Troubleshooting the GX-3R Pro
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 Pro has been properly set up for calibration.
2. Change the charcoal filter or 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 Pro with a cloth dampened with water if it becomes excessively dirty. Do not use alcohol or other cleaning solvents.

Replacing the Batteries (Alkaline Version)

NOTE: Use Duracell MN2400 or PC2400 alkaline batteries or RKI Instruments, Inc.
lithium-ion battery pack 49-1625 to maintain the CSA classification of the GX-3R Pro. Use of other batteries will void the CSA classification and may void the warranty. Do not mix old/new or different types of batteries.
NOTE: Utiliser Procell 2400 piles alcalines ou RKI Instruments, Inc. pack batterie lithium-
ion 49-1625 de maintenir la classification CSA de la GX-3R Pro. L’utilisation d’autres piles annule la classification CSA et peut annuler la garantie. Ne mélangez pas les anciennes/nouvelles ou différents types de piles.
CAUTION: Sensors, filters, and alkaline batteries are the only user-serviceable parts in
the GX-3R Pro. Do not replace or modify any other part.
10 0 • Chapter 6: Mainten ance GX-3R Pro Operator’s Manual
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