85 • Chapter 5: User Mode and Calibration GX-3R Pro Operator’s Manual
7. Use AIR to scroll to the channel whose calibration gas value you want to change.
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.
Channel
Min. Cal.
Concentration
Max. Cal.
Concentration
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
2
-compensated
CO sensor); needs monthly calibration
25 ppm 2,000 ppm
Ammonia 8 ppm 400 ppm
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
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