Instruction manual

ControlWave Gas Flow Computer (GFC Plus) Instruction Manual (CI-ControlWave GFC Plus)
Revised Feb-2013 Installation 2-11
 Optional Process Manifold Blocks – Process manifold blocks may
be installed on the transducers to permit the use of connector
assemblies having different connection centers. The manifold
blocks, which are oval in appearance, mate with the tranducer’s
process flange. The blocks may be installed in several positions to
achieve different connection centers as shown in Figure 2-5.
Connecting to a Gage Pressure Transducer (GPT)
You can secure an optional gage pressure transducer (GPT) to the
bottom of the enclosure instead of the MVT. Gage pressure transducers
are equipped with a ½-14 NPT male pipe fitting. The GPT connects to
the process manifold by tubing.
2.2.5 Process Pipeline Connection (Meter Runs without Cathodic
Protection)
Units equipped with an optional MVT may be mounted directly on the
pipeline or remotely on a vertical stand-alone two-inch pipe or on a wall
or panel. Units equipped with optional gage pressure transducers (GPT)
may only be mounted remotely, that is, on a vertical stand-alone two-
inch pipe or on a wall or panel. The Earth ground must run between the
unit’s ground lug and Earth ground (rod or bed) even though units
equipped with a MVT or GPT may be grounded to the pipeline. If any
pressure transmitters or pulse transducers are remotely mounted,
connect their chassis grounds to the pipeline or Earth ground.
Note: When installing the unit without cathodic protection, you do not
use the transducer to manifold dielectric isolation kit.
2.2.6 Process Pipeline Connection (Meter Runs with Cathodic
Protection)
Dielectric isolators are available and are always recommended as an
added measure in isolating the ControlWave unit from the pipeline even
though the enclosure does provide some galvanic isolation from the
pipeline and should not be affected by the cathodic protection or other
EMF on the pipeline. Units equipped with an MVT may be mounted
directly on the pipeline (using a manifold block) or remotely on a
vertical stand-alone two-inch pipe. Units equipped with a GPT can only
be remotely mounted on a vertical 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.