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GX-2003 Operator’s Manual Start Up, Bar Hole Mode • 42

RESET SILENCE button to acknowledge the failure and return to

the Mode Select Screen. Replace the failed sensor as soon as

possible.

If the oxygen sensor fails, press and release the RESET SILENCE

button to acknowledge the failure and continue to Bar Hole Mode.

The gas reading for the oxygen sensor will be replaced by “XXX”.

Replace the failed sensor as soon as possible.

If the CO or H

S sensor is installed and fails, press and release the

RESET SILENCE button to acknowledge the failure and continue

to Bar Hole Mode.

10. The GX-2003 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

time and battery charge level.

Performing a Demand Zero, Bar Hole Mode

Before using the GX-2003, it is a recommended to set the fresh air

readings for the target gases by performing a demand zero. This will

set the CH

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-2003,

Bar Hole Mode”.

3. Press and hold the ▲AIR button. The pump will start and the

display will indicate “FRESH AIR PURGE . . .” below the oxygen

reading for a few seconds before indicating that a demand zero is

taking place and prompting you to hold the ▲AIR button.

4. Continue to hold the ▲AIR button until the display prompts you

to release the ▲AIR button. The GX-2003 will set the fresh air

reading for the CH

and oxygen channels. Start up is complete and

the unit is now ready for bar hole testing.

CH4 0%LEL

OXY 20.9VOL%

ENTER:MEASURE

DISP :PURGE

B.H.MODE 21:09

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RKI Instruments GX-2003 Betreibershandbuch Seite 49