RKI Instruments GX-2012 Manual - Manual (Page 26)

18 • Optional Accessories GX-2012 Operator’s Manual
Purge Tee Fitting
The 17-4430RK-01 purge fitting is used to detect gas levels in a pressurized
gas stream from a pipeline or vessel being purged. The sample port of the
purge fitting is inserted into the flowing gas, and the vent port will allow any
excess gas to release to the atmosphere to avoid damage to pump or sensors.
Figure 12: Purge Tee Fitting
External Dilution Fitting
An external dilution fitting is available for the GX-2012. It is a 1:1 dilution
fitting and is designed to mate with the inlet fitting and accept a sample hose
or probe. The fittings are made with brass and nickel plated brass and are
appropriate for use with the four standard gases. The dilution fitting is
normally used when it is necessary to introduce air into a sample that has no
oxygen or a very low level of oxygen, such as a nitrogen purged sample. It
can also be used when one of the target gas levels in the sample area will
likely be present in a concentration above the detection range for that gas.
Since the fittings partially consist of unplated brass, they are not appropriate
for detection of elevated levels of H
2
S.
Figure 13: Dilution Fitting
GX-2012 Inlet
Pressurized
Stream
Sample Port
Excess
Pressurized
Sample
Vent Port