62 • Calibration Mode GX-2012 Operator’s Manual
13. With the 4-gas calibration values screen displayed, press the
POWER ENTER button. AUTO CAL begins to flash and the current gas
readings are displayed. If you want to exit back to the main menu without
completing a calibration, press and release the DISPLAY (ADJ) button.
14. Connect the tubing from the demand flow regulator to the rigid tube on
the probe. Allow the gas to flow for one minute.
15. Press and release the POWER ENTER button to set the calibration to the
programmed values.
If all channels passed calibration, PASS displays along the bottom of the
screen, then the calibration menu displays.
If any of the sensors cannot calibrate to the proper value, FAIL displays
along the bottom of the screen and the GX-2012 lists the sensor(s) that
failed to calibrate. In the example below, the OXY and H
2
S channels
failed calibration. The other sensors calibrated normally.
The buzzer and alarm lights activate. Press and release the RESET
SILENCE button after the buzzer and lights stop to reset the alarm and
return to the calibration menu. Attempt to calibrate again. If the failure
continues, investigate the cause. See “Troubleshooting” on page 143.
16. Disconnect the tubing from the probe.
17. Unscrew the demand flow regulator from the calibration cylinder.
18. If you have a 5 sensor unit and wish to calibrate the %volume
combustible gas sensor, go back to step 1 and repeat the process selecting
the %volume calibration gas value screen in step 12 and using a
0
20.9
0
0.0
%LEL
%
ppm
ppm
MAINTENANCE
CH4
O2
AUTO CAL
CO
H2S
%
ppm
MAINTENANCE
O2
FAIL
H2S
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