Siemens SITRANS TH100 Operating Instructions Manual page 87

2. Connect the supply voltage to the terminals 3 (+) and 4 (-).
For devices with HART communication, connect a ≥ 250 Ω resistor.
3. Take the polarity into account. The device has reverse polarity protection.
SITRANS TH100/TH320/TH420/TR320/TR420/TF320/TF420 with 4 to 20 mA/HART
Operating Instructions, 05/2020, A5E41864807-AB
Input 1: TC (int. CJC or
ext. 2-wire or 3-wire CJC)
Input 2: 2-wire, 3-wire or 4-wire
RTD
Input 1 (I1) and/or
input 2 (I2):
3-wire or 4-wire potentiometer
Connecting
6.6 Connecting TR420
Input 1 (I1): 5-wire potentiome‐
ter
Input 2 (I2): 3-wire potentiome‐
ter
87