Model CTF878 Startup Guide
27
Chapter 2.
Figure 15: CFT-V Clamping Fixture with Transducers and Conduit Boxes Installed
2.1.11.3
Wiring the Transducers
The user must know the direction of the flow since it will dictate how to connect the transducers to the flowmeter
(refer to Figure 18 on page 31 for transducer wiring).
Identifying the Transducers
The transducers must be connected so that the flow direction is from the Upstream pair of transducers to the
Downstream pair of transducers. A pair of transducers is made up of a Receiver and a Transmitter (see Figure 14 on
page 26 for a CFT-V fixture installation or Figure 7 on page 20 for a CFT-PI installation).
In a pair of transducers, the Transmitter must be downstream of the Receiver. Basically, along the axis of the pipe, the
Transmitter sends a signal opposite the direction of the flow.
Making Cable Connections
Panametrics Sensing supplies transducer cables up to 500 ft (153 m) in length. If longer cables are required, consult
the factory for assistance.
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:
If non-Panametrics Sensing cables are being used to connect the flowmeter transducers to the CTF878
electronics console, they must have electrical characteristics identical to the Panametrics Sensing cables.
Type RG 62 a/u coaxial cable should be used, and each cable must be the same length (within ±4 in.).
Figure 1-1 on page 1-4 shows a typical CTF878 system. For detailed instructions on installing clamp-on transducers,
refer to the supplied drawings and the Panametrics Sensing
Gas Transducer Installation Guide.
Summary of Contents for CTF878
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