DigitalFlow™ GF868 Startup Guide (1 and 2-Channel) 3
Chapter 1. Installation
1.3.5 Temperature and Pressure Transmitters
When installing temperature and pressure transmitters, 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 transducers than 20 pipe diameters.
1.3.6 Transducer Cables
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 cables, or any other cables that
could cause electrical interference. Also, protect the cables and connections from the weather and corrosive
atmospheres.
Note: If you are using your own cabling to connect the transducers to the electronics console, the cabling must have
electrical characteristics identical to the cable supplied by GE. Cable must be type RG 62 A/U coaxial cable
(93 ) and each cable must be the same length (within ± 4 in.).
1.4 Installing a Flowcell
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 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 mounting the spoolpiece into the pipeline.
Figure 1 on page 4 shows a block diagram of a typical Model GF868 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 Transducer Installation Guide.
CAUTION! The manual insertion mechanism systems are for low pressure applications (80
psig/5.5 bar or less). Use the appropriate safety precautions when inserting or
withdrawing the insertion mechanism.
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