RKI Instruments GX-2003 Manual - Manual (Page 50)

43 • Bar Hole Testing GX-2003 Operator’s Manual
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. 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 the
you to initiate an air purge cycle to purge gas from the GX-2003 after a
sample is taken. See “Setting the Bar Hole Measurement Time” on
page 66 to change the bar hole sample time.
In a low-light environment, press and release the (SHIFT)▼ 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 LCD Back Light Time Setting”
on page 65 to program backlight duration. If CONFIRMATION BEEP
is turned on in the Setup Mode menu, the GX-2003 beeps once every
15 minutes to confirm that it’s operating.
Performing a Bar Hole Test
1. Start up the GX-2003 as described in “Start Up, Bar Hole Mode” on
page 39.
2. Take the GX-2003 to the bar hole that will be tested.
3. Insert the probe into the bar hole and press and release the
POWER/ENTER button. The pump will turn on and the sample
period will begin with the sample period counting down in
seconds in the lower right corner of the display above the battery
icon. The CH
4
channel will be displayed in %VOL and B.H.
MODE will be flashing.
4. After 15 seconds of sampling, if the CH
4
reading is less than 5
%VOL, the CH
4
channel will automatically begin displaying in
%LEL.
CH4 0%VOL
OXY 20.9VOL%
B.H.MODE 21:09
30