GX-2012 Operator’s Manual
Calibrating the GX-2012 • 153
12. Use the AIR
and (SHIFT)
button to select which sensor(s) you want to calibrate,
the standard 4 sensors or the % volume combustible gas sensor.
The following instructions illustrate calibrating the standard 4 sensors first, then the
%volume combustible gas sensor.
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 o the main menu without completing a calibration, press and release the
DISPLAY (ADJ) button.
14. Open the hose clamp and connect the tubing from the filled gas bag 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 131.
16. Disconnect the tubing from the probe.
0
20.9
0
0.0
%LEL
%
ppm
ppm
MAINTENANCE
CH
4
O
2
AUTO CAL
CO
H
2
S
%
ppm
MAINTENANCE
O
2
FAIL
H
2
S
www.calcert.com
1.800.544.2843
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