YZ Systems NJEX 8300G, Manual, Page: 69 / 126

YZ Systems, Inc. • 3101 Pollok Drive • Conroe, Texas • USA • 77303 • P: 936.788.5593 • F: 936.788.5720
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NJEX 8300 ver .092001 ATEX Rev.
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Odorant Inlet Manifold &
Bulk Odorant Filter Assembly
The odorant inlet manifold & bulk odorant filter assembly,
figure 172
, is located adjacent to each pump / verometer
assembly and performs the following functions:
• Provides the system’s odorant supply connection by
means of a 1/4" FNPT connection located on the back
of the enclosure.
• Provides a pressure gage to show odorant supply
pressure from storage tank.
• Provides an odorant supply isolation valve.
• Houses the first of two odorant filter systems within the
8300G System.
• Acts as the odorant return manifold during system purge
operations, refer to Conducting a Forward Purge in
Section 12, page 74.
In the event that the internal filter elements become dirty,
a bulk odorant filter repair kit is available.
Fill Valve
The purpose of the fill valve is to control odorant flow into
the Verometer,
figure 173
. The fill valve is opened when
a pneumatic signal from the solenoid valve manifold
depresses the fill valve diaphragm. The valve is closed
when the pneumatic signal is removed and the fill valve
spring returns the check valve wafer to its seat. The
transfer of odorant from the bulk storage tank to the
Verometer, when this valve is activated, is dependant on
an adequate pressure differential between the bulk
storage tank and the Verometer, with the bulk storage
tank retaining the higher of the two pressures. These
pressures are monitored by two pressure transmitters
mounted in the system. One transmitter monitors the
incoming pressure from the bulk storage tank, while the
other, mounted on the expansion tank, monitors the
pressure in the verometer. A differential pressure range
of 5 - 10 psi
(.345 - .69 Bar)
must be present, with the
differential not exceeding either end of the range.
Figure 172
Figure 173