ABB TTH300 Operating Instruction page 22

Electrical connections
Resistance thermometers (RTD) / resistors (potentiometers)
2
1 3
1 1 1
2
2
3 3 3
4
Fig. 10
1 Potentiometer, four-wire circuit
2 Potentiometer, three-wire circuit
3 Potentiometer, two-wire circuit
1) Sensor backup/redundancy, sensor drift monitoring, mean measurement or differential measurement
Thermocouple / voltage and resistance thermometer (RTD) / thermocouple combinations
1 2
1 1
A
2 2
5
B
6
Fig. 11
A Sensor 1
B Sensor 2
2 x voltage measurement 1)
1
1) Sensor backup/redundancy, sensor drift monitoring, mean measurement or differential temperature measurement
22
5
4 6
1 1 1
2 2
J
J
J
3 3 3
4 4
4
J
5
J
6 6
2 x RTD, three-wire circuit 1)
4
2 x RTD, two-wire circuit 1)
5
3 4 5
1 1
1
2 2
2
J
3
4
5
5
6
6
2 1 x voltage measurement
2 x thermocouple 1)
3
4 1 x thermocouple
7 8
1 1
2
J
J
3 3
6 RTD, four-wire circuit
7 RTD, three-wire circuit
8 RTD, two-wire circuit
7
6
1 1
2
J
J
3 3
5 5
6 6
1 x RTD, four-wire circuit and 1 x thermocouple 1)
5
1 x RTD, three-wire circuit and 1 x thermocouple 1)
6
1 x RTD, two-wire circuit and 1 x thermocouple 1)
7
TTH300
1
2
3
+
-
4
5
6
1
2
3
+
-
4
5
6
OI/TTH300-EN
A00003
A00004