Installation Manual 17
Wiring
3.2 Connect the Model 3700 to the sensor
• If you are installing the Model 3350 controller, this step is not required. Go to Section
3.4.
• To connect the Model 3700 transmitter to a Micro Motion sensor, follow the
instructions in this section.
3.2.1 Installation options
The Model 3700 can be wired to the sensor in either of the following configurations:
• 4-wire remote transmitter (requires a 4-wire cable). See Figure 1-5 and Section 3.2.2.
• Remote core processor with remote transmitter (requires both a 4-wire and a 9-wire
cable). See Figure 1-6 and Section 3.2.3.
3.2.2 Wiring instructions for 4-wire remote installations
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.
Use the 4-wire cable supplied by Micro Motion. This cable consists of one pair of 18
AWG (0,75 mm
2
) wires (red and black) for the VDC connection, and one pair of 22
AWG (0,35 mm
2
) wire (green and white) for the RS-485 connection.
b. Connect the four wires from the core processor to the appropriate terminals on the
transmitter.
See Table 3-2 and Figure 3-3 (standard core processor) or Figure 3-3 (enhanced core
processor).
• Do not leave bare wires exposed.
• Do not ground the shield or drain wires at the transmitter.
Table 3-2: Transmitter terminals for 4-wire cable
Terminal Wire color
(1)
(1) Wire colors apply to only 4-wire cable supplied by Micro Motion.
Function
13 Red VDC+
14 Black VDC–
15 White RS-485A
16 Green RS-485B
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