182 • Appendix E: Using the GX-6000 in Inert Mode
GX-6000 Operator’s Manual
Appendix E: 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 (ALARM
POINTS)” on page 145 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.
NOTE:
If
INERT MODE
is set to
OFF
in Maintenance Mode, the
INERT
item will
not appear in the Alarm Points Menu.
2 . Select
INERT
(not
O2
) in order to view or change Inert Mode’s oxygen alarm
points.
ALARM - P
ALARM POINTS
CH4
O2
H2S
CO
VOC
INERT
ESCAPE