Dwyer UXF3 - Manual (Page 22)

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3.4. Flow transmitter wiring
3.4.1. Cautions in wiring
(1) Use a special coaxial cable as a signal cable between the detector and flow transmitter. Do not provide a
junction or splice of the signal cable midway.
(2) The signal cable between the detector or flow transmitter should be run in metallic conduits. Upstream and
downstream signal cables may be put in the same conduit but, to avoid interference, do not put the power
cable together with the signal cables.
(3) For output signal, use a shielded cable, where possible.
(4) To avoid noise interference, do not put the cables together with heavy duty line or the like into the same
duct.
(5) If a ground wire is included in the power cable, connect it to ground properly.
(6) A power switch is not provided on the instrument and must be mounted separately if desired.
(7) Seal unused wiring ports with available caps.
3.4.2. Applicable wires
Use the following cables.
z Power cable : 3-wire or 2-wire cabtyre cable
Nominal sectional area 0.75mm
2
(0.00117 in2) or more
Outside diameter Ɏ11mm (0.433 in)
z Output signal cable : 2-wire or multi-wire cabtyre cable as required
Outside diameter Ɏ11mm (0.433 in)
z Detector-flow transmitter cable : Signal cable by type designation
In case of SX1 : High-frequency coaxial double shield cable with characteristic
impedance of 50 ȍ
Outside diameter Ɏ7.3mm (0.288 in)
In case of SX2 : High-frequency coaxial double shield cable with characteristic
impedance of 50 ȍ
With one-side waterproof BNC connector
Outside diameter
Ɏ7.3mm (0.288 in.)
3.4.3. Treatment of wiring port
The casing of the flow transmitter is IP66. However, if installed in a humid place, the wiring ports must be made airtight to
avoid ingress of moisture, condensation, etc. Be sure to use the waterproof glands furnished with the instrument in order to
ensure the waterproof capability. A gland, which is not ready to be used, should be sealed with the supplied cover.
Do not install the instrument where there is a risk of flooding.
Bulletin F-107-UXF3