RKI Instruments GX-2012 Manual - Manual (Page 120)

112 • Using Maintenance Mode GX-2012 Operator’s Manual
to perform a bump test. These instructions assume you are using a 4-gas
cylinder and a %volume cylinder.
1. Before performing a bump test, perform a fresh air adjustment as
described in “Performing a Fresh Air Adjustment” on page 103.
2. Install the demand flow regulator onto the calibration cylinder.
3. Connect the sample tubing to the demand flow regulator.
4. Install the hose and probe to the GX-2012.
5. Use the AIRS or (SHIFT)T buttons to display the BUMP menu item.
6. Press and release the POWER ENTER button to display the bump test
gas values.
7. Use the AIRS or (SHIFT)T buttons to see the %volume combustible
gas bump test value.
NOTE: If you wish to change any of the bump test gas values, you must exit
the BUMP menu item and enter the AUTO CAL menu item. See
steps 8 through 15 in “Calibrating Using Auto Calibration” on
page 105 for instructions to change the gas values.
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