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20 Micro Motion
®
Model 1700 and 2700 Transmitters
Wiring the Transmitter to the Sensor
3.2.1 4-wire cable
Micro Motion offers two types of 4-wire cable: shielded and armored. Both types contain shield
drain wires.
User-supplied 4-wire cable must meet the following requirements:
• Twisted pair construction
• The gauge requirements as described in Table 2-2
• The applicable hazardous area requirements, if the core processor is installed in a hazardous
area (see the approval documentation shipped with the transmitter or available on the Micro
Motion web site)
3.2.2 9-wire cable
Micro Motion offers three types of 9-wire cable: jacketed, shielded, and armored. Refer to Micro
Motion’s 9-Wire Flowmeter Cable Preparation and Installation Guide for detailed descriptions of
these cable types and for assistance in selecting the appropriate cable for your installation.
3.3 Wiring for 4-wire remote installations
To connect the cable, follow the steps below.
1. Prepare the cable as described in the sensor documentation.
2. Connect the cable to the core processor as described in the sensor documentation.
3. To connect the cable to the transmitter:
a. Identify the wires in the 4-wire cable. The 4-wire cable supplied by Micro Motion consists
of one pair of 18 AWG (0,75 mm
2
) wires (red and black), which should be used for the
VDC connection, and one pair of 22 AWG (0,35 mm
2
) wires (green and white), which
should be used for the RS-485 connection.
b. Connect the four wires from the core processor to terminals 1–4 on the mating connector
of the transmitter. See Figures 3-1, 3-2, and 3-3. Never ground the shield, braid, or drain
wire(s) at the transmitter.
Figure 3-1 4-wire cable between enhanced core processor and transmitter
Core processor
terminals
4-wire cable Mating connector
(transmitter)
Maximum cable length: see Table 2-2
VDC+
VDC–
RS-485A
RS-485B
User-supplied or
factory-supplied cable
VDC+ (Red)
VDC– (Black)
RS-485A (white)
RS-485B (Green)