GX-2012 Operator’s Manual Using Maintenance Mode • 113
8. A bump test may be performed on the standard 4 sensors or on the
%volume combustible sensor. Use the AIRS or (SHIFT)T buttons to
display the screen for the sensor(s) you wish to bump test.
9. Before proceeding, confirm that the bump test gas value(s) are the same
as the concentration(s) in the calibration cylinder. If they are not, adjust
the bump test gas value(s) by entering the AUTO CAL menu item,
changing the values there, and reentering the BUMP menu.
10. Connect the tubing from the demand flow regulator to the rigid tube on
the probe and quickly press and release the POWER ENTER button. The
unit will begin counting down from 30.
11. When AUTO CAL in the BUMP--SET menu item in Maintenance Mode
is set to OFF:
• The instrument will indicate which channels passed or failed the
bump test with a P (pass) or an F (fail) to the right of the gas.
• To view the bump test gas readings press the AIRS or (SHIFT)T
button. You can scroll between the bump test results and the bump
test gas readings with the AIRS or (SHIFT)T button.
F
P
F
P
%LEL
%
ppm
ppm
MAINTENANCE
CH4
O2
BUMP
CO
H2S
5
12.0
10
25.0
%LEL
%
ppm
ppm
MAINTENANCE
CH4
O2
BUMP
CO
H2S
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