RKI Instruments GX-2012 Manual - Manual (Page 81)

GX-2012 Operator’s Manual Overview • 73
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.