178 • Appendix D: Using the GX-6000 in Bar Hole Mode GX-6000 Operator’s Manual
3 . Press and hold the
▲
AIR button. The pump will start and the display will prompt
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-6000 will set the fresh air reading for the combustible gas 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
combustible gas and oxygen in a bar hole. The factory set time is 30 seconds. To change
the bar hole sampling time, see “Setting the Bar Hole Measurement Time (BAR HOLE
TIME)” on page 152. At the end of the sample period, the pump will shut off and the peak
combustible gas 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-6000 after a sample is taken.
In a low-light environment, press and release the SHIFT
▼
(PANIC) 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 Backlight Time
Setting (BACK LIGHT TIME)” on page 148 to program backlight duration. If
CONFIRMATION
is turned on in the Maintenance Mode menu, the GX-6000 beeps
once every user-defined interval to confirm that it’s operating.
Performing a Bar Hole Test
1 . Start up the GX-6000 as described in “Start Up, Bar Hole Mode” on page 176.
2 . If you wish to change the station ID, press the SHIFT
▼
(PANIC) and DISP/LOCK
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 button.
4:07
STATION ID
VALVE 3