RKI Instruments Gas Tracer - Manual (Page 105)

Gas Tracer Operator’s Manual Bar Hole Testing • 97
13.The Gas Tracer is now operating in Bar Hole Mode. The pump is
off and the following screen appears.
The methane and oxygen channels are displayed along with the
battery charge level.
Performing a Fresh Air Adjustment, Bar Hole Mode
Before using the Gas Tracer, it is recommended to set the fresh air
readings for the target gases by performing a fresh air adjustment.
This will set the combustible gas channel to zero and the OXY channel
to 20.9%.
1. Find a fresh-air environment. This is an environment free of toxic
or combustible gases and of normal oxygen content (20.9%).
2. Turn on the unit as described above in “Turning On the Gas Tracer,
Bar Hole Mode”.
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 Gas Tracer 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 170. 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 Gas Tracer after a sample is taken.
0
20.9
%LEL
%
BAR HOLE MODE
CH
4
O
2
001