RKI Instruments GX-2009 Manual - Manual (Page 36)

31 • Calibration Mode GX-2009 Operator’s Manual
CAL menu item to perform a span adjustment. A fresh air adjustment
performed in Calibration Mode is the same as a fresh air adjustment in
Normal Mode. The AIR CAL menu item is available in Calibration Mode for
convenience when performing a complete calibration.
WARNING: Calibrate the GX-2009 in a non-hazardous environment.
1. Find a fresh air environment, an environment of normal oxygen content
(20.9%) that is free of toxic and combustible gasses.
2. When the AIR CAL screen is displayed, press and release the POWER
MODE button. A screen appears that displays the current gas readings
and prompts you to press the AIR button by displaying the “PUSH AIR”
message at the bottom of the screen.
3. Press and hold the AIR button. The LCD prompts you to continue to
hold the AIR button.
4. Release the AIR button when the following screen appears.
5. The unit will take a few seconds to adjust the fresh air readings, then
indicate “END” to the right of the battery icon and return to the AIR CAL
Screen.
Performing a Span Adjustment in AUTO CAL
Entering the AUTO CAL menu item allows you to perform a span
adjustment on all channels simultaneously.
Perform a span adjustment as part of a calibration after performing a fresh
air adjustment. Performing a span adjustment requires the use of a
0 20.9
PUSH AIR
CO ppm H2S ppm
CH4 %LEL OXY vol%
0 0.0
A i r C A L
HOLD AIR
A d J
RELEASE
AUTO CAL