Section 3 - Grounding & Isolation Page 3-7 S1400T-2808B
Figure 3-7 - Grounding of Thermometer Well in Gas Line
3.4 ISOLATING EQUIPMENT FROM THE PIPELINE
3.4.1 Meter Runs Without Cathodic Protection
Series 2808-XXB Trandmitters may be mounted directly on the pipeline or remotely on a
vertical or horizontal stand-alone two-inch stand-pipe. The Earth Ground Cable is to run
between the 2808’s Chassis Ground Terminal and Earth Ground (Rod or Bed) even though
the unit’s Multivariable Transducer may be grounded to the pipeline.
3.4.2 Meter Runs With Cathodic Protection
Dielectric isolators are available from Bristol Babcock and are always recommended as an
added measure in isolating the 2808-35B Differential Pressure Transmitter from the
pipeline even though the 2808 Transmitter’s circuitry does provide 600V galvanic isolation
from the pipeline and should not be affected by cathodic protection or other EMF on the
pipeline. 2808-35B Transmitters may be mounted directly on the pipeline (see Figure 3-8)
or remotely on a vertical stand-alone two-inch stand-pipe (see Figure 3-9). 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:
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