Emerson ControlWave EFM 4710A - Page 64

2-12 / Installation & Operation CI-ControlWave EFM
by cathodic protection or other EMF on the pipeline. ControlWave EFMs may be mounted
directly on the pipeline (see Figure 2-6) or remotely on a vertical stand-alone two-inch pipe
(see Figure 2-7). 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)
• all conductive connections or tubing runs between the ControlWave EFM electronic
flow meter and a turbine meter, pulse transducer, or any other I/O device that is
mounted on the pipeline
• any Temperature Transducer, Pressure Transmitter, etc. and their mount/interface to
the pipeline.
Isolating
Fittings
Clamp(s)
Ground Rod or System
AWG 4 Ground Wire
2” Pipe-mounting Package
Mounting Pipe does not
contact the Main Pipeline.
Note:
Mounting Bolts (4
)
Bottom Washers (4
)
To p Wa s h e r s ( 4 )
Dielectric Bolt Sleeves (4
)
Dielectric Gasket
& Flange Seals (2
)
Multivariable
Trans d uc er
(MVT)
Valve Blo c k
Manifold
Transducer to Manifold
Dielectric Isolation Kit
Figure 2-7 - ControlWave EFM Remote Installation
(with Cathodic Protection)
Note: Remote installation of a unit, without Cathodic protection, is similar to that
of Figure 2-7 except it doesn’t utilize the Transducer to Manifold Dielectric
Isolation Kit.
Mount the ControlWave EFM’s enclosure on a stand-alone vertical 2-inch pipe or on a
wall. The ground conductor connects between the ControlWave EFM’s Chassis Ground
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 will have to be electrically isolated from the
ControlWave EFM. 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