4.3 Connecting TH420
Procedure
1. Connect the input or inputs to terminals 3 to 9.
Input 1 (I1) and/or
input 2 (I2):
2-wire, 3-wire or 4-wire RTD or
linear resistance
Input 1 (I1) and/or
input 2 (I2):
TC (int. CJC or
ext. 2-wire, 3-wire or 4-wire
CJC)
Input 1 (I1) and/or
input 2 (I2):
Voltage input
(single-pole or two-pole)
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
Input 1 (I1): 5-wire potentiome‐
ter
Input 2 (I2): 3-wire potentiome‐
ter
2. Connect the supply voltage to the terminals 1 (+) and 2 (-).
Take the polarity into account. The device has reverse polarity protection.
For devices with HART communication, connect a ≥ 250 Ω resistor.
Connecting
4.3 Connecting TH420
SITRANS TH320/TH420/TR320/TR420/TF320/TF420
34 Compact Operating Instructions, 03/2018, A5E41865021-AA
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