223 • Alarms GX-6000 Operator’s Manual
Appendix G: Using the GX-6000 in Inert Mode
Inert Mode is used to measure the combustible gas and/or oxygen level in a
purged environment. In order for the instrument to operate in Inert Mode, the
oxygen alarm must be set to H-HH operation meaning that both alarms are
increasing. The oxygen Low Alarm High Alarm points are factory set at
5.0% and 10.0%.
It is recommended that an IR CH
4
or IR HC sensor be installed if the
instrument is going to be used in Inert Mode since these sensors do not
require oxygen to work properly. The catalytic LEL sensor does not operate
at oxygen concentrations below 10 %volume. If it is necessary to use the
catalytic LEL sensor while operating in Inert Mode, a dilution fitting must be
installed. Installing a dilution fitting will affect the oxygen reading since
you’re introducing oxygen into the sample.
NOTE: INERT MODE must be set to ON in Maintenance Mode for Inert
Mode to be an option in the Mode Select Screen at startup.
Alarms
The oxygen channel alarm points in Inert Mode are different from those in
Normal Mode. All other alarm points settings remain unchanged.
Since the application for Inert Mode is to detect a rising oxygen level in
purged environments, both oxygen alarms are rising in Inert Mode. The
factory set alarm points for Inert Mode are 5.0 %volume (Low Alarm) and
10.0 %volume (High Alarm). These Inert Mode alarm points are user
adjustable in Maintenance Mode.
1 . Follow the steps described in “Updating the Alarm Point Settings” on
page 157 to change the alarm points for Inert Mode. The only difference
between what’s described in that section and what the screen will look
like is that INERT will be an option in the Alarm Points Menu if
INERT MODE is set to ON in Maintenance Mode.
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