4.3.2 Connect 4-wire cable
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 mm²) wires for the VDC connection, and one pair of white and green 22 AWG
(0.326 mm²) 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.
• Wire gauge of 22 AWG (0.326 mm²) or larger, with a maximum cable length of 1,000 ft
(305 m).
Prepare a cable with a metal conduit
Prerequisites
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.
Procedure
1. Remove the integral 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.
Prepare a cable with user-supplied cable glands
Prerequisites
Important
For user-supplied cable glands, the gland must be capable of terminating the drain wires.
Procedure
1. Remove the core processor cover using a flat-blade screw driver.
2. Pass the wires through the gland.
3. Terminate the shield and drain wires inside the gland.
4. Assemble the gland according to vendor instructions.
Wiring
Installation Manual
May 2019 MMI-20020989
44 Micro Motion Fork Density Meter
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