Toptech FCM II - Wiring Examples for RTD Temperature Probes

Chapter 3 – Field Wiring
22
FCM II Installation Guide: 20160419 - Part # 2307
3.2.4 RTD TEMPERATURE PROBE WIRING
White
4-Wire
100 Ohm Platium RTD
Alpha = 0.0385
Note: All 4 wires MUST be run to the
sensor. Do not simply jumper REF- to
COM or REF+ to V+ at the FCM II.
For 3-wire and 2 wire probes, the
connection of REF- to COM and REF+ to
V+ should be as close as possible to the
probe (within inches).
White
Red
Red
White
Red
2-Wire RTD Connection
White
Red
3-Wire RTD Connection
Red
Com R- R+ V+
D4 D3 D2 D1
   
RTD
Top Side
Bottom Row
NC NC I- I+
E4 E3 E2 E1
Top Side
Middle Row
4-20 mA IN
Iout Rtn Com V+
F4 F3 F2 F1
Top Side
Top Row
4-20 mA OUT
E
D
F
Terminal
Number
1234
1 2 3 4
1234
Figure 3.5 FCM II Field Wiring: RTD