GX-2012 Operator’s Manual
Bar Hole Testing • 75
4. Continue to hold the AIR
button until the display prompts you to release the AIR
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.
Bar Hole Testing
In Bar Hole Mode, the you can initiate sampling for a fixed time period to monitor for
methane and oxygen in a bar hole. The factory set time is 30 seconds. To change the bar
hole sampling time, see “Updating the Bar Hole Sampling Time” on page 126. At the end
of the sample period, the pump will shut off and the peak methane and minimum oxygen
levels monitored during the sample period will be displayed. Bar Hole Mode also allows
you to initiate an air purge cycle to purge gas from the GX-2012 after a sample is taken.
In a low-light environment, press and release the (SHIFT)
button to turn on the display
backlight. Although the backlight will turn on when any button is pressed, other buttons
may initiate an undesired operation sequence. See “Updating the LCD Back Light Time
Setting” on page 123 to program backlight duration. If
BEEP. SET
is turned on in the
Maintenance Mode menu, the GX-2012 beeps once every 5 minutes to confirm that it’s
operating.
While in Bar Hole Mode, you may select or change the current station ID by pressing the
(SHIFT)
button and DISPLAY (ADJ) button and releasing when you hear a beep.
Performing a Bar Hole Test
1. Start up the GX-2012 as described in “Start Up, Bar Hole Mode” on page 69.
2. If you wish to change the station ID, press the (SHIFT)
and DISPLAY (ADJ)
buttons and release when you hear a beep. The current station ID will be displayed
and it will be flashing. If you wish to exit the Station ID Select Screen without
making any changes, press and release the RESET SILENCE button.
Use the AIR
and (SHIFT)
buttons to scroll to the desired station ID and press and
release POWER ENTER. The unit will return to the Bar Hole Measuring Screen.
3. Take the GX-2012 to the bar hole that will be tested.
S Id
001
SEL
0
0.0
%LEL
%
BAR HOLE MODE
CH
4
O
2
001
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