Model CTF878 Startup Guide
29
Chapter 2.
Wiring a typical CTF878 ultrasonic gas flowmeter system requires interconnection of the following components:
•
four transducers (two upstream and two downstream)
•
two preamplifiers (one for the upstream receiver and one for the downstream receiver)
•
the electronics console
IMPORTANT:
For the flowmeter system to function correctly, the CTF878 receiver board frequency range must match
that of the transducers being used. To check, compare the labels on the electronics console and on the
transducers. Default frequency ranges include:
1MHz / 888kHz, 500kHz / 471kHz, 250kHz / 222kHz
Refer to Figure 18 on page 31 and 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 a pair of coaxial cables with BNC to BNC connectors (supplied by the factory or equivalent), connect the
two transmitter transducers to connectors TX1 (Upstream Transmitter) and TX2 (Downstream Transmitter) in the
electronics console
(see Figure 17 on page 30).
CAUTION!
As part of maintaining the environmental rating (NEMA/TYPE 4) on the remote preamplifier, thread
sealant is required on all conduit entries.
2.
Using a second pair of BNC to BNC coaxial cables, connect the preamplifiers (attached to the receiver
transducers) to RX1 (Upstream Receiver) and RX2 (Downstream Receiver) in the electronics console (refer to
Figure 16 and Figure 17 on page 30).
After the wiring has been completed, the transducer channels must be programmed before measurements can
begin. See Chapter 3,
Initial Setup, for instructions.
Figure 16: Receive Transducer with Preamplifier
Summary of Contents for CTF878
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