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Reference Manual
00809-0100-4444, Rev AC
Section 3: Advanced Installation Details
January 2015
Advanced Installation Details
3.6.2 Process leak protection (option M1)
The 8705 is available with process leak detection through the use of a threaded connection and
pressure relief valve (PRV). This coil housing configuration is a factory sealed all-welded
enclosure. The M1 configuration is available for the 8705 only.
8705 with option code M1 - 8705xxxxxxxxM1
A PRV can be installed in the threaded connection to prevent possible over-pressuring of the coil
housing caused by a primary seal failure. The PRV is capable of venting fugitive emissions when
pressure inside the coil housing exceeds 5 psi. Additional piping may be connected to the PRV to
drain any process leakage to a safe location (see Figure 3-13).
In the event of a primary seal failure, this configuration will not protect the coils or other internal
components of the sensor from exposure to the process fluid.
Note
The PRV is supplied with the meter to be installed by the customer. Installation of the PRV and
any associated piping must be performed in accordance with environmental and hazardous area
requirements.
Figure 3-13. 8705 with M1 Coil Housing Configuration and PRV