24 • Start Up, Normal Mode GX-2003 Operator’s Manual
3. Press and briefly hold down the POWER/ENTER button. The
Mode Select Screen displays.
NOTE: If a “N” appears to the right of the battery icon, this indicates
that a Ni-MH battery pack is being used instead of alkaline
batteries.
4. The cursor will begin in front of Normal Mode and Normal Mode
will flash dark and light indicating it is selected.
5. With Normal Mode selected, continue with the startup sequence
as described in the previous section, “Turning On the GX-2003,
Normal Mode Only”, from step 4 on page 21 on.
NOTE: If no button is pressed for 20 seconds, the unit will proceed
into whichever mode has the cursor in front of it.
6. To exit Normal Mode and return to the Mode Select Screen, press
and hold the (SHIFT)▼ button for 5 seconds while in the Normal
Operation Screen.
Performing a Demand Zero, Normal Mode
Before using the GX-2003, it is recommended to set the fresh air
readings for the target gasses by performing a demand zero. This will
set the CH4, CO, and H
2
S 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 gasses and of normal oxygen content (20.9%).
2. Turn on the unit as described above in “Turning On the GX-2003,
Normal Mode Only” or “Turning On the GX-2003 in Normal
Mode With All Modes Active”.
3. Press and hold the ▲AIR button. The display prompts 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 all channels. Start up is complete and the unit is now
ready for monitoring.
>NORMAL MODE
BAR HOLE MODE
LEAK CHECK MODE
21:09
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