Wiring The Transducers - GE DigitalFlow GS868 Startup Manual

1.6.2 Wiring the Transducers

ATTENTION EUROPEAN CUSTOMERS! In order to meet CE Mark requirements, all wiring
connections must be made in accordance with the instructions in Appendix A, CE Mark
Compliance.
Wiring a typical Model GS868 ultrasonic natural gas flowmeter system requires interconnection of the following
components:
•
a pair of transducers (per channel) mounted in the flowcell
•
a preamplifier for each channel
•
a lightning protector (optional)
•
the electronics console
To wire the transducers, complete the following steps:
WARNING! Before connecting the transducers, take them to a safe area and discharge any
static buildup by shorting the center conductor of the transducer cables to the metal shield on
the cable connector.
1. Using the pair of coaxial cables with BNC to BNC connectors supplied by the factory (or equivalent cables),
connect both transducers to the preamplifier.
CAUTION!
2. If an optional lightning protector is being installed, connect it to the preamplifier.
3. Using the pair of coaxial cables with BNC to flying lead connectors supplied by the factory (or equivalent cables),
connect the preamplifier to terminal block
location of the terminal block and the terminal block pin assignments.
4. For a 2-channel Model GS868 flowmeter, repeat steps 1-3 to wire the Channel 2 transducer system to terminal
CH2
block .
Note: It is not required that Channel 2 of a 2-channel Model GS868 be used. This channel may be left inactive for
future use.
After the wiring has been completed, the transducer channel(s) must be activated before measurements can begin. See
Chapter 2, Initial Setup, for instructions.
DigitalFlow™ GS868 Startup Guide
As part of maintaining the FM/CSA environmental rating (TYPE 4) on the remote
preamplifier, thread sealant is required on all conduit entries.
CH1
in the electronics console. Refer to Figure 10 on page 20 for the
Chapter 1. Installation
9