GX-3R Operator’s Manual Chapter 5: User Mode and Calibration • 47
4 . Install the calibration cup onto the GX-3R. Use the label and imprinting to make sure
that the calibration cup gets installed in the correct orientation relative to the GX-3R. Be
sure the calibration cup is pushed on all the way.
5 . Use the tubing to connect the regulator to the inlet of the calibration cup.
6 . While in User Mode, press AIR to scroll to BUMP.
7 . 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 “BUMP”.
8 . If necessary, use AIR to scroll to the Bump screen for the gas(es) you want to bump test.
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 but there is
no reason to bump test the H
2
response.
9 . Make sure the GX-3R has been turned on for at least 45 seconds before continuing.
GX-3R
AIR
POWER
MODE
CO/H
2
SLELO
2
FRONT
Inlet
Figure 6: Calibration Cup Installation
CYL A
M 7:49
50 25.0
CO ppm H2S ppm
50 12.0
CH4 %LEL O2 %
BUMP
M 7:49
50 25.0
CO ppm H2S ppm
50 12.0
CH4 %LEL O2 %
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