GX-3R Pro Operator’s Manual Chapter 5: User Mode and Calibration • 80
4. Press and release POWER MODE. The display shows the gases assigned to Cylinder A and
the assigned calibration values (see page 85 if the calibration values do not match the
calibration gas cylinder’s concentrations).
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, the standard 4 gases (combustible gas, O
2
, CO, and H
2
S) 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. Toxic sensors are assigned to
Cylinder D or Cylinder E.
6. Make sure the GX-3R Pro 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 indicates “AUTO CAL” and “APPLY
GAS”.
NOTE: To back out of the gas application screen without performing the bump test,
press and release AIR and POWER MODE together.
9. For toxic gas cylinders (like cylinders containing H
2
S), it is important to vent the regulator
while installing it onto the cylinder. Venting the regulator during installation helps prevent air
from getting into the cylinder and degrading the gas. Open the regulator by turning the knob
counterclockwise and install it onto the cylinder.
10. Allow the gas to flow for 1 minute for all gases except NH
3
. Allow NH
3
gas to flow for 2
minutes.
11. Press and release POWER MODE.
MAINTE 7:49
12.0
O2 %
50 50 25.0
CH4 %LEL CO ppm H2S ppm
AUTO CAL CYLINDER A
MAINTE 30
20.9
O2 %
0 0 0.0
CH4 %LEL CO ppm H2S ppm
AUTO CAL APPLY GAS
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