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Reference Manual
00809-0100-4665, Rev AA
August 2010
5-17
Rosemount 8732
Relief Valves The first optional configuration, identified by the W1 in the model number
option code, uses a completely welded coil housing. This configuration does
not provide separate electrode compartments with external electrode access.
This optional housing configuration provides a relief valve in the housing to
prevent possible overpressuring caused by damage to the lining or other
situations that might allow process pressure to enter the housing. The relief
valve will vent when the pressure inside the sensor housing exceeds 5 psi.
Additional piping (provided by the user) may be connected to this relief valve
to drain any process leakage to safe containment (see Figure 5-18).
Figure 5-18. Coil-Housing
Configuration — Standard
Welded Housing With Relief
Valve (Option Code W1)
Process Leak
Containment
The second optional configuration, identified as option code W3 in the model
number, divides the coil housing into three compartments: one for each
electrode and one for the coils. Should a damaged liner or electrode fault
allow process fluid to migrate behind the electrode seals, the fluid is contained
in the electrode compartment. The sealed electrode compartment prevents
the process fluid from entering the coil compartment where it would damage
the coils and other internal components.
The electrode compartments are designed to contain the process fluid at full
line pressure. An o-ring sealed cover provides access to each of the electrode
compartments from outside the sensor; drainports are provided in each cover
for the removal of fluid.
NOTE
The electrode compartment could contain full line pressure and it must be
depressurized before the cover is removed.
Optional:
Use drain port to
plumb to a safe area
(Supplied by user)
1
/2 – 14 NPT Conduit
Connection
¼'' NPT – 5 psi
Pressure Relief Valve