Rev. 01/11 -1.11- TFXL-X
2. The terminals within the TFXL are a cable-clamp type. Connect
the appropriate wires to the corresponding screw terminals in the
transmitter. See Figure 1.4 on page 1.10. Secure wires by
tightening to between 0.5 and 0.6 Nm of torque.
NOTE: The transducer cable carries low level, high frequency
signals. In general, it is not recommended to add additional cable to
the cable supplied with the DTTN, DTTH, DTTS or DTTC
transducers. If additional cable is required, contact the Dynasonics
factory to arrange an exchange for a transducer with the appropriate
length of cable. Cables to 990 feet (300 meters) are available. To
add cable length to a transducer, the cable must be the same type
as utilized on the transducer. Twinaxial cables can be lengthened
with like cable to a maximum overall length of 100 feet (30 meters).
Coaxial cables can be lengthened with RG59 75 Ohm cable and
BNC connectors to 990 feet (300 meters).
FIELD WIRING — GENERAL
The remote mount TFXL is equipped with two conduit holes located
in the flow meter enclosure that should be suitable for most
installations. A sealed cord grip or NEMA 4 conduit connection
should be utilized to retain the NEMA 3 integrity of the flow meter
enclosure. Failure to do so will void the manufacturer’s warranty and
can lead to product failure.
Wiring methods and practices are to be made in accordance with
the NEC—National Electrical Code
®
—and/or other local ordinances
that may be in effect. Consult the local electrical inspector for
information regarding wiring regulations.
When making connections to the field wiring terminals inside the
flow meter, strip back the wire insulation approximately 0.25 inch
(6 mm). Stripping back too little may cause the terminals to clamp
on the insulation and not make good contact. Stripping back too
much insulation may lead to a situation where the wires could short
together between adjacent terminals. Wires should be secured in
the field wiring terminals using a screw torque of between 0.5 and
0.6 Nm.
FIELD WIRING — POWER
Power for the TFXL flow meter is obtained from a direct current
(DC) power source. The power source should be capable of
supplying between 11 and 30 Vdc at a minimum of 0.25 Amps or
250 milliamps. With the power from the DC power source disabled
PART 1 - TRANSMITTER INSTALLATION
Transmitter
Power
Connections
DC Power
Supply
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