GX-2012 Operator’s Manual
Overview • 69
Chapter 4: Using the GX-2012 in Bar Hole Mode
Overview
This chapter explains how to operate the GX-2012 in Bar Hole Mode. Bar Hole Mode is
used to perform consistent checks of bar holes when tracking down underground gas
leaks. When the GX-2012 is in Bar Hole Mode, only the combustible and oxygen
channels are displayed.
If a GX-2012 is intended for bar hole testing, it is shipped with Bar Hole Mode enabled so
that the operator must choose which operational mode to use when the unit is turned on.
NOTE:
Units intended for bar hole testing are typically calibrated to methane. In
addition, the unit must have a %volume combustible sensor installed.
Start Up, Bar Hole Mode
This section explains how to start up the GX-2012 in Bar Hole Mode and get it ready for
operation.
Turning On the GX-2012, Bar Hole Mode
WARNING:
If a CO or H
2
S sensor is installed, these sensors will not be active while
the GX-2012 is in Bar Hole Mode.
WARNING:
Gas alarms are not active when the GX-2012 is in Bar Hole Mode.
The following description of the GX-2012 start up sequence assumes that the following
menu items in Maintenance Mode are turned on:
LNCH BRK
,
ID DISP
,
CL RMNDR
,
and
BP RMNDR
. If either of these items is turned off, then the corresponding screen will
not appear.
NOTE:
In order for
BAR HOLE MODE
to appear as a selection in the Mode Select
Screen in Step 3 below, the
L./B. MODE
menu item in Maintenance Mode
must be set to bH or LC bH.
1. Connect the sample hose to the GX-2012’s quick connect inlet fitting.
2. Screw the bar hole probe onto the sample hose’s threaded fitting.
3. Press and briefly hold down the POWER ENTER button. The Normal Mode Select
Screen displays.
0
20.9
0
0.0
vol%
%LEL
%
ppm
ppm
CH
4
O
2
NORMAL ?
CO
H
2
S
www.calcert.com
1.800.544.2843
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