GX-2009 Operator’s Manual
Start Up • 21
If you wish to continue, press and release the POWER MODE button to acknowledge the
failure. The gas reading for the failed sensor will be replaced by “- - -”. Replace the failed
sensor as soon as possible.
9. If
Auto Zero Adjustment
is set to
On
, then the GX-2009 will perform an automatic fresh
air adjustment.
If the fresh air adjustment is successful, the unit will proceed to Normal Mode. If one or
more of the sensors fails the fresh air adjustment, the display will indicate which sensor or
sensors failed. If a failure occurs, press and release the POWER MODE button to proceed
to Normal Mode. The gas reading for the failed sensor or sensors will be replaced by “- - -
”. Replace any sensors that fail the automatic fresh air adjustment as soon as possible.
WARNING: If the Auto Zero Adjustment feature is turned on, make sure that you start-up
the GX-2009 in a known fresh air environment, an environment free of
combustible or toxic gasses and of normal oxygen content, 20.9%. If you do
not start-up the unit in a fresh air environment, the fresh air adjustment will
not be accurate.
10. The GX-2009 is now operating in Measuring Mode and monitoring for gas. The Normal
Operation Screen appears.
The concentrations of the target gasses are displayed along with the time in the lower right
corner and the battery charge level in the lower left corner.
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.
Auto
ZERO
0 20.9
5:15
CO ppm H2S ppm
CH4 %LEL OXY vol%
0 0.0
A i r C A L
HOLD AIR
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