221 • Bar Hole Testing GX-6000 Operator’s Manual
6 . At the end of the sample period, the pump will shut off and the buzzer
will sound, then the peak combustible gas reading and the minimum
oxygen reading for the sample period will be displayed. The peak
combustible gas reading will also be visually displayed on the graph
along the bottom of the screen.
7 . If a high concentration of combustible gas is encountered, a fresh air
purge can be performed to purge the hose, probe and GX-6000 of gas
before the next bar hole test. To perform a purge, do the following:
• Remove the probe from the barhole so the instrument will draw fresh
air.
• Press and release the DISP/LOCK button. The display will now
indicate PURGE along the bottom of the screen and the purge time
will begin counting down from 30 seconds in the lower middle
portion of the display. If you wish to cancel the purge, press and
release the RESET button.
4:07
CH4
O2
50
%LEL
11.9
%
PEAK
4:07
CH4
O2
0
%LEL
20.9
%
30 SEC
PURGE