170 • Calibrating the GX-2012 GX-2012 Operator’s Manual
3. 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.
4. Press and release the POWER ENTER button. The single calibration
screen displays for the sensor you selected. The gas reading flashes.
5. Connect the tubing from the filled gas bag to the rigid tube on the probe.
Allow the calibration gas to flow for one minute.
6. 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.
7. Press and release the POWER ENTER button to save the span value. The
LCD will indicate that the calibration has ended, then the single
calibration menu displays.
- - -
vol%
MAINTENANCE
CH4
ONE CAL
0
%LEL
MAINTENANCE
CH4
ONE CAL
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