Cable Lengths; Temperature And Pressure Transmitters; Transducer Cables; Installing A Flowcell - GE DigitalFlow GS868 Startup Manual

Cable Lengths

Temperature and Pressure
Transmitters

Transducer Cables

Installing a Flowcell

Installation
Locate the flowcell/transducers as close as possible to the electronics
console. The factory supplies transducer cables up to 500 ft (153 m)
in length. If longer cables are required, consult the factory for
assistance.
When installing temperature and/or pressure transmitters in the
flowcell, locate them downstream of the flowmeter transducers.
These transmitters should be positioned no closer to the flowmeter
transducers than 2 pipe diameters and no further away from the
flowmeter transducers than 20 pipe diameters.
When installing the transducer cables, always observe established
standard practices for the installation of electrical cables. Specifically,
do not route transducer cables alongside high amperage AC power
lines or any other cables that could cause electrical interference. Also,
protect the transducer cables and connections from the weather and
corrosive atmospheres.
Note: When using non-GE cables to connect the flowmeter
transducers to the Model GS868 electronics console, the
cables must have electrical characteristics identical to the GE
cables. Type RG 62 a/u coaxial cable should be used, and
each cable must be the same length (within ±4 in.).
A flowcell is the section of pipe where the transducers are mounted. It
can be created either by mounting the transducers on the existing
pipeline or by mounting them on a spoolpiece. A spoolpiece is a
separately manufactured pipe section, matched to the existing pipe,
which contains ports for mounting the transducers. This approach
allows the transducers to be aligned and calibrated before inserting
the spoolpiece into the pipeline.
Figure 1-1 on page 1-4 shows a block diagram of a typical Model
GS868 system, including optional pressure and temperature
transmitters. For detailed instructions on installing the transducers
and/or spoolpiece, refer to the supplied drawings and the GE Gas
Transducer Installation Guide for Ultrasonic Flowmeters.
March 2008
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