S1400T-2808B Page 3-8 Section 3 - Grounding & Isolation
i all conductive tubing that runs between the pipeline and mounting valve manifold
and/or the units Multivariable Pressure Transducer
i all conductive connections or tubing runs between the 3808 Transmitter and turbine
any other input device that is mounted on the pipeline
i any RTD and its mount/interface to the pipeline.
Figure 3-8 - 2808-35B Direct Mount Installation (with Cathodic Protection)
Mount the 2808-35B on a stand-alone vertical 2-inch pipe. The ground conductor connects
between the units green Chassis Ground Screw and a known good earth ground. Connect
the case of an associated RTD to the known good earth ground. If the mounting 2-inch pipe
is in continuity with the pipeline it will have to be electrically isolated from the 2808-35B
Transmitter. Use a strong heat-shrink material such as RAYCHEM WCSM 68/22 EU 3140.
This black tubing will easily slip over the 2-inch pipe and then after uniform heating (e.g.,
with a rose-bud torch) it electrically insulates and increases the strength of the pipe stand.
See BBI Specification Summary F1670SS-0a for information on PGI Direct Mount Systems
and Manifolds.
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