RKI Instruments Gas Tracer - Manual (Page 107)

Gas Tracer Operator’s Manual Bar Hole Testing • 99
begin with the sample period counting down in seconds in the
lower right corner of the display. The CH
4
channel will be
displayed in %VOL. The methane channel’s reading will also be
displayed in graph format on the left side of the screen.
If you wish
to cancel the measurement, press and release the RESET SILENCE
button.
5. After 15 seconds of sampling, if the combustible gas reading is less
than 5 %VOL, the combustible gas channel will automatically
begin displaying in %LEL.
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 Gas Tracer 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.
25
20.9
30 vol%
%
BAR HOLE MODE
sec
CH
4
O 2
MEASURE
25
19.0
%LEL
%
BAR HOLE MODE
CH
4
O
2
PEAK
PEAK