The 4-wire cable supplied by Micro Motion consists of one pair of red and black 18 AWG
(0.75 mm
2
) wires for the VDC connection, and one pair of white and green 22 AWG
(0.35 mm
2
) wires for the RS-485 connection.
User-supplied 4-wire cable must meet the following requirements:
• Twisted pair construction.
• Applicable hazardous area requirements, if the core processor is installed in a
hazardous area.
• Wire gauge appropriate for the cable length between the core processor and the
transmitter.
Wire gaugeTable 3-2:
Wire gauge Maximum cable length
VDC 22 AWG (0.35 mm
2
) 300 ft (90 m)
VDC 20 AWG (0.5 mm
2
) 500 ft (150 m)
VDC 18 AWG (0.8 mm
2
) 1000 ft (300 m)
RS-485 22 AWG (0.35 mm
2
) or larger 1000 ft (300 m)
3.2.2 Prepare the 4-wire cable
Important
For user-supplied cable glands, the gland must be capable of terminating the drain wires.
Note
If you are installing unshielded cable in continuous metallic conduit with 360º termination shielding,
you only need to prepare the cable – you do not need to perform the shielding procedure.
Wiring
6 Micro Motion CNG050
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