Wiring Precautions
WARNING!
• DO NOT OPEN THE ENCLOSURE WHEN ENERGIZED OR AN EXPLOSIVE ATMOSPHERE IS
PRESENT.
• All plumbing and electrical installations of ow meters must be in compliance with local
codes, the end user’s best engineering practices, and manufacturer’s recommendations.
• Connect earth ground to a chassis ground screw on the inside of FT3 enclosure.
• An external power disconnect and 16A over-current protection are required for the AC and
DC powered FT3.
• Do not install the FT3 enclosure near an igniter, igniter-controller or switching equipment.
• Do not install an external power supply in a cabinet containing an igniter controller or
switching equipment.
• This ow meter contains components that can be damaged by static electricity. You must
discharge yourself by touching a grounded steel pipe or other grounded steel material prior
to working inside this ow meter.
• For the remote sensor option, the serial number of the electronics enclosure must match
the remote sensor probe.
• Close any unused conduit openings using suitably certied plugs
Power Wiring
For power wiring, use stranded copper wire, 16 to 20 gauge. If an external 24VDC power source is
used, twisted pair shielded cable is recommended. Supply connection wiring must be rated for at
least 90°C.
Grounding
The enclosure must be properly grounded with a quality earth ground. 16 gauge, stranded wire is
recommended. For US and Canada installation, the internal ground terminal on the enclosure must be
used. Use of the external ground terminal is optional.
Signal Wiring
For signal wiring, the recommended wire gauge is 18 to 22 AWG. Always use twisted pair shielded
cable. The cable shield should not be connected at the ow meter, it should be connected at the
power supply AC ground terminal or instrumentation AC ground. Do not route the power and signal
wires in the same conduit. Power wires must enter left-hand conduit entry. Signal and remote sensor
(where applicable) must enter right-hand conduit entry.
Wiring | 34
Model FT3
Wiring
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