Emerson Process Management ControlWave XFC - Manual (Page 54)

2-12 / Installation & Operation CI-ControlWave XFC
Lug and a known good earth ground. Connect the cases of Temperature Transducers,
Pressure Transmitters, etc., to the known good earth ground. If the mounting 2-inch pipe
(when used) is in continuity with the pipeline it may have to be electrically isolated from
the ControlWave XFC. 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.
Figure 2-6 - ControlWave XFC Direct Mount Installation with Cathodic Protection
Note: Direct Mount installation of a MVT equipped unit without Cathodic
protection, is similar to that of Figure 2-6 except it doesn’t utilize the Transducer
to Manifold Dielectric Isolation Kit.
2.3.1.5 Process Pipeline Connection (Meter Runs with Cathodic Protection)
Dielectric isolators are available from Bristol Babcock and are always recommended as an
added measure in isolating the ControlWave XFC from the pipeline even though the
enclosure does provide some galvanic isolation from the pipeline and should not be affected
by cathodic protection or other EMF on the pipeline. ControlWave XFCs equipped with a
MVT may be mounted directly on the pipeline (see Figure 2-6) or remotely on a
vertical/horizontal stand-alone two-inch pipe or on a wall or panel (see Figure 2-7).
ControlWave XFCs equipped with a GPT can only be mounted on a vertical/horizontal
stand-alone two-inch pipe or on a wall or panel. It is recommended that isolation fitting
always be used in remotely mounted meter systems. An isolation fittings or gasket should
be installed between the following connections:
• all conductive tubing that runs between the pipeline and mounting valve manifold
and/or the units Multivariable Transducer (MVT)