RKI Instruments GX-2012 Manual - Manual (Page 90)

82 • Bar Hole Testing GX-2012 Operator’s Manual
6. At the end of the sample period, the pump will shut off and the buzzer
will sound, then the peak methane reading and the minimum oxygen
reading for the sample period will be displayed. The peak methane
reading will also be visually displayed on the graph along the left side of
the screen.
7. If a high concentration of methane is encountered, a fresh air purge can
be performed to purge the hose, probe and GX-2012 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 DISPLAY (ADJ) 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 right corner
of the display. If you wish to cancel the purge, press and release the
RESET SILENCE button.
• When the purge is complete, the screen will return to the initial Bar
Hole Mode screen.
25
19.0
%LEL
%
BAR HOLE MODE
CH
4
O
2
PEAK
PEAK
0
20.9
30
vol%
%
BAR HOLE MODE
sec
CH
4
O
2
PURGE
0
20.9
%LEL
%
BAR HOLE MODE
CH
4
O
2
001