GX-2009 Operator’s Manual
Calibration Mode • 35
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 calibration kit. The procedure below
describes a span adjustment of all four channels using a calibration kit that includes a 4-gas
calibration cylinder, a 0.5 LPM (liters per minute) regulator, a calibration adapter plate, and
non-absorbent sample tubing. The standard 4-gas cylinder consists of 50% LEL methane,
12% oxygen, 25 ppm H
2
S, 50 ppm CO, and a balance of nitrogen. If the H
2
S channel on your
GX-2009 is active, then use a 4-gas cylinder. If the H
2
S channel on your GX-2009 is not
active, you may use a 3-gas cylinder to adjust the span. The standard 3-gas cylinder consists
of 50% LEL methane, 12% oxygen, 50 ppm CO, and a balance of nitrogen. See “Parts List”
on page 67 for available calibration kits and calibration kit spare parts.
NOTE:
If the combustible gas channel is calibrated to a gas other than methane, such as
isobutane, use an appropriate multigas cylinder or use single calibration to calibrate
the combustible channel.
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
www.calcert.com
1.800.544.2843
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