158 • Bump Testing
GX-2012 Operator’s Manual
5. If a fixed flow regulator without a knob is used, disconnect it from the cylinder and
immediately clamp down the hose clamp to prevent the release of gas from the gas
collection bag. If a fixed flow regulator with a knob or a dispensing valve is used, turn
the knob clockwise to stop the gas flow, clamp down the hose clamp and remove the
regulator or dispensing valve from the cylinder.
6. Disconnect the tubing from the regulator or dispensing valve.
7. Install the hose and probe to the GX-2012.
8. Use the AIR
or (SHIFT)
buttons to display the BUMP menu item.
9. Press and release the POWER ENTER button to display the bump test gas values.
10. Use the AIR
or (SHIFT)
buttons to see the %volume combustible gas bump test
value.
11. A bump test may be performed on the standard 4 sensors or on the %volume
combustible sensor. Use the AIR
or (SHIFT)
buttons to display the screen for the
sensor(s) you wish to bump test.
12. 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.
13. Open the hose clamp and connect the tubing from the filled gas bag to the rigid tube
on the probe and quickly press and release the POWER ENTER button. The unit will
begin counting down from 30.
MAINTENANCE
BUMP
50
12.0
50
25.0
%LEL
%
ppm
ppm
MAINTENANCE
CH
4
O
2
BUMP 30
CO
H
2
S
100
vol%
MAINTENANCE
CH
4
BUMP 30
www.calcert.com
1.800.544.2843
0
5
10
15
20
25
30
