54 • Chapter 5: User Mode and Calibration GX-3R Operator’s Manual
5 . Use the tubing to connect the regulator to the inlet of the calibration cup.
Performing a Span Adjustment
1 . While in User Mode, press AIR to scroll to GAS CAL.
2 . Press and release POWER MODE. The AIR CAL menu item appears.
3 . Use AIR to scroll to the AUTO CAL menu item.
4 . Press and release POWER MODE. The display shows the gases assigned to Cylinder A
and their assigned calibration values (see pg.58 if the calibration values do not match the
calibration gas cylinder’s concentrations). The bottom of the screen alternates between
“CYL A” and “AUTO CAL”.
5 . If necessary, use AIR to scroll to the Auto Cal screen for the gas(es) you want to
calibrate. As shipped from the factory, combustible gas, O
2
, H
2
S, and CO are assigned to
Cylinder A. If a H
2
-compensated CO sensor is installed, H
2
is assigned to Cylinder D.
6 . Make sure the GX-3R has been turned on for at least 45 seconds before continuing.
7 . Press and release POWER MODE.
8 . The gas readings flash and the bottom of the screen alternates between “APPLY” and
“AUTO CAL”.
NOTE: To back out of the gas application screen without performing the bump test, press
and release AIR and POWER MODE together.
9 . Turn the regulator knob counterclockwise to open the regulator.
CYL A
M 7:49
50 25.0
CO ppm H2S ppm
50 12.0
CH4 %LEL O2 %
AUTO CAL
M 7:49
50 25.0
CO ppm H2S ppm
50 12.0
CH4 %LEL O2 %
APPLY
M 7:49
0 0.0
CO ppm H2S ppm
0 20.9
CH4 %LEL O2 %
AUTO CAL
M 7:49
0 0.0
CO ppm H2S ppm
0 20.9
CH4 %LEL O2 %
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