RKI Instruments GX-2012 Manual - Manual (Page 87)

GX-2012 Operator’s Manual Start Up, Bar Hole Mode • 79
If the CO or H
2
S sensor is installed and fails, press and release the
RESET SILENCE button to acknowledge the failure and continue to Bar
Hole Mode.
13. The GX-2012 is now operating in Bar Hole Mode. The pump is off and
the following screen appears.
The methane and oxygen channels are displayed along with the battery
charge level.
Performing a Fresh Air Adjustment, Bar Hole Mode
Before using the GX-2012, it is recommended to set the fresh air readings for
the target gases by performing a fresh air adjustment. This will set the
combustible gas channel to zero and the OXY channel to 20.9%.
1. Find a fresh-air environment. This is an environment free of toxic or
combustible gases and of normal oxygen content (20.9%).
2. Turn on the unit as described above in “Turning On the GX-2012, Bar
Hole Mode”.
3. Press and hold the AIRS button. The pump will start and the display will
prompt you to hold the AIRS button.
4. Continue to hold the AIRS button until the display prompts you to
release the AIRS button. The GX-2012 will set the fresh air reading for
the CH
4
and oxygen channels as it counts down from 8. Once the
countdown has finished, start up is complete and the unit is ready for bar
hole testing.
0
20.9
%LEL
%
BAR HOLE MODE
CH
4
O
2
001