RKI Instruments Gas Tracer - Manual (Page 52)

44 • Inert Mode Gas Tracer Operator’s Manual
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 in
which both alarms are increasing. The oxygen Warning and Alarm
points are factory set at 5.0% and 10.0%.
It is recommended that the %volume sensor be installed in a unit that
is used to monitor combustible gas during Inert Mode operation since
it does 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 during Inert Mode
operation, a dilution fitting must be installed. Installing a dilution
fitting will affect the oxygen reading since you’re introducing oxygen
into the sample.
Alarms
The oxygen channel alarm points in Inert Mode are different from
those in Normal Mode. All other alarm point settings remain
unchanged.
Since the application for Inert Mode is to detect a rising oxygen level
in purged environments, both oxygen alarms are set to rising. The
factory set alarm point is 5.0% volume for the Warning and 10.0%
volume for the Alarm. These alarm points are user adjustable in
Maintenance Mode. See “Updating the Alarm Point Settings” on
page 152 for instructions to set the alarm points.
Start Up and Operation
1. With the oxygen alarm pattern set to H-HH, start up the Gas Tracer
as described in “Turning On the Gas Tracer, Normal Mode Only”
on page 20.