Sensor Electronics SEC Millenium Series Instruction And Operation Manual page 68

Wire Sizing (Power):
0 to 500 feet wire length; recommend wire gauge size 16 AWG
501 to 1000 feet wire length; recommend wire gauge size 14 AWG
Safety Interrupt (mains circuit breaker):
A circuit breaker or interrupt switch for overcurrent protection rated for 30 watts located in the mains
supply circuit is recommended. It should be located near the device it is protecting and labeled.
To minimize the length of exposed conductor, strip wires to 3/8 inch. Solder tin the exposed wire to
increase durability.
Protective bonding is provided by an internal screw location for connection of a grounding wire.
Installation of this wire should include the use of a locking feature (i.e. locking washer).
Conduit:
1
For hazardous location installations seals must be installed within 18 inches of conduit entries.
The SEC3120 has three (3) ¾" NPT threaded ports for mounting and wiring the sensor(s) and transmitter
into a permanent installation.
Field wiring connections are made on the backside of the SEC3120 printed circuit board (PCB). For
connection details refer to Figure 1.
Shielded cable is recommended. Wiring should be installed in metal conduit with no other cabling in the
same conduit.
Operator Manual
SEC3120 Digital Transmitter
Page 7 of 40
Sensor Electronics Corporation
P/N 1580281
Rev 10, 20150707