RKI Instruments GX-2009 Manual - Manual (Page 22)

17 • Start Up GX-2009 Operator’s Manual
Performing a Fresh Air Adjustment
Before using the GX-2009, set the fresh air reading. Performing this
adjustment ensures accurate gas readings in the monitoring environment
as long as the calibration is current.
1. Find a fresh-air environment. This is an environment free of toxic or
combustible gasses and of normal oxygen content (20.9%).
2. With the unit on and in the Normal Operation Screen, press and hold
the AIR button. The LCD displays the following screen prompting you to
keep pressing the AIR button.
3. After a few seconds the LCD displays the following screen prompting
you to release the AIR button.
4. The unit will take a few seconds to adjust the fresh air readings, then
return to the Normal Operation Screen.
Turning Off the GX-2009
1. Press and hold the POWER MODE button for about three seconds to
turn off the unit. The buzzer will sound and the LCD back light will turn
on.
2. Release the button when the LCD is blank. The unit is off.
A i r C A L
HOLD AIR
A d j
RELEASE