GX-3R Operator’s Manual Chapter 3: Operation • 23
11 . If the combustible gas sensor is nearing the end of its useful life, the reading conversions
that can be made in the LIST item in Display Mode become limited. The following
screen displays, the LEDs flash, and the instrument beeps.
Press and release POWER MODE to confirm the limited gas list and continue to
Measuring Mode. See pg.35 for the limited conversion list. Replace the combustible
sensor as soon as possible.
12 . At the end of the 45 second warmup, the GX-3R begins monitoring for gas in Measuring
Mode. The Measuring Mode Screen displays the current gas reading for each target gas.
Performing a Demand Zero
Perform a demand zero before using the GX-3R. This sets the combustible gas, H
2
S, and CO
channels 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-3R”.
3 . Press and hold AIR. The LCD prompts you to continue holding AIR and the buzzer
pulses while you hold the button (if KEY TONE is set to ON in User Mode).
4 . Continue to hold AIR until the LCD prompts you to release it. The GX-3R sets the fresh
air reading for all channels. Start up is complete and the unit is now ready for
monitoring.
Turning Off the GX-3R
1 . Press and hold POWER MODE.
2 . TURN OFF appears on the display and the buzzer pulses for about five seconds (if KEY
TONE is set to ON in User Mode).
3 . Release the button when TURN OFF disappears from the display.
7:49
0 0.0
CO ppm H2S ppm
0 20.9
CH4 %LEL O2 %
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