RKI Instruments GX-2009 Manual - Manual (Page 66)

61 • Maintenance GX-2009 Operator’s Manual
8. Replace each battery with a new one. Note the polarity markings on the
circuit board and batteries when installing each battery. Tabs on the
bottom of each battery match up with holes in the circuit board.
9. Reinstall the rear case to the front case with the four case screws.
Checking the Combustible Gas Sensor’s Condition
If you suspect that the combustible sensor has been contaminated or may
be reaching the end of its operational life, do the following to confirm it is
still operating properly:
1. Perform a fresh air adjustment as described in “Performing a Fresh Air
Adjustment” on page 30.
2. Apply calibration gas as described in “Performing a Span Adjustment in
ONE CAL” on page 36.
3. Instead of setting the gas reading to match the calibration gas
concentration, adjust the gas reading as high as possible.
4. A new sensor can typically be adjust to more than twice the calibration
gas concentration. If you are not able to adjust the combustible gas
reading to be at least 10% higher than the calibration gas
concentration, then the sensor should be replaced as soon as possible.
Holes match up
with tabs on
bottom of battery.
Holes match up
with tabs on
bottom of battery.
Figure 22: Front Case With Batteries Removed