Instruction Manual

110 • Using Maintenance Mode GX-2012 Operator’s Manual
6. Press and release the POWER ENTER button to display the single
calibration menu. The %LEL sensor will be displayed first.
7. Use the AIRS or (SHIFT)T button to display the sensor you want to
calibrate (in this example the combustible gas % LEL sensor). If you
have a 5 sensor unit, the %vol sensor will be one of the choices. It is
shown below.
8. Press and release the POWER ENTER button. The single calibration
screen displays for the sensor you selected. The gas reading flashes.
9. Connect the tubing from the demand flow regulator to the rigid tube on
the probe. Allow the calibration gas to flow for one minute.
10. If necessary, use the AIRS and (SHIFT)T buttons to adjust the reading
to match the concentration listed on the calibration cylinder.
If the reading already matches the concentration listed on the calibration
cylinder, press and release the AIRS button then press and release the
(SHIFT)T button so that the instrument sees a change and resets the
calibration date.
11. Press and release the POWER ENTER button to save the span value. The
- - -
%LEL
MAINTENANCE
CH4
ONE CAL
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vol%
MAINTENANCE
CH4
ONE CAL
0
%LEL
MAINTENANCE
CH4
ONE CAL