Emerson ROC827 K Type Thermocouple Input Modules, RTD Wiring, Wire RTD Red Jumper Red

ROC827 Instruction Manual

Note: All I/O modules are isolated on the field side. Be aware that you can induce ground loops by tying commons from various modules together.

4-Wire RTD 3-Wire RTD 2-Wire RTD

Red

Red

Jumper Red

Jumper

Red

Jumper

Figure 4-14. RTD Sensor Wiring Terminal Connections

Figure 4-14 and Table 4-2 display the connections at the RTD terminals for the various RTD probes.

Table 4-2. RTD Wiring

Terminal	4-Wire RTD	3-Wire RTD	2-Wire RTD
REF	Red	Jumper to +	Jumper to +
+	Red	Red, Jumper to REF	Red, Jumper to REF
–	White	White	White, Jumper to RET
RET	White	White	Jumper to –

Note: The wire colors for the RTD being used may differ.

4.10J and K Type Thermocouple Input Modules

The five-channel J and K Type Thermocouple Input module monitors either J or K Type Thermocouple (T/C). J and K refer to the type of material used to make a bimetallic junction: Type J (Iron/Constantan) and Type K (Chromel/Alumel). These dissimilar junctions in the thermocouple junction generate different millivolt levels as a function of the heat to which they are exposed.

The J and K Type Thermocouple Input module measures the voltage of the thermocouple to which it is connected. The T/C voltage is measured and a Cold Junction Compensation (CJC) correction factor is applied to compensate for errors due to any voltage inducted at the wiring terminals

Issued Mar-06 Input/Output Modules 4-16