Emerson Micro Motion T Series, Руководство по установке

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4.2 Connect 4-wire cable
4.2.1 4-wire cable types and usage
Micro Motion offers two types of 4-wire cable: shielded and armored. Both types contain
shield drain wires.
The cable supplied by Micro Motion consists of one pair of red and black 18 AWG
(0.823 mm
²
) wires for the VDC connection, and one pair of white and green 22 AWG
(0.326 mm
²
) wires for the RS-485 connection.
User-supplied 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, or the host.
Wire gauge Maximum cable length
VDC 22 AWG (0.326 mm
²
) 300 ft (91 m)
VDC 20 AWG (0.518 mm
²
) 500 ft (152 m)
VDC 18 AWG (0.823 mm ² ) 1,000 ft (305 m)
RS-485 22 AWG (0.326 mm ² ) or larger 1,000 ft (305 m)
4.2.2 Prepare a cable with a metal conduit
Procedure
1. Remove the core processor cover using a flat-blade screw driver.
2. Run the conduit to the sensor.
3. Pull the cable through the conduit.
4. Cut the drain wires and let them float at both ends of the conduit.
4.2.3 Prepare a cable with user-supplied cable glands
Procedure
1. Remove the core processor cover using a flat-blade screw driver.
2. Pass the wires through the gland nut and gland body.
Transmitter power and I/O wiring Installation Manual
February 2020 20002172
18 Micro Motion T-Series