Siemens SITRANS Series Compact Operating Instructions page 41

5. For devices with "Intrinsic safety" type of protection, use an isolating power supply that
corresponds to the requirements of the relevant type of protection.
6. Connect the input terminals
SITRANS TH320/TH420/TR320/TR420/TF320/TF420
Compact Operating Instructions, 03/2018, A5E41865021-AA
2-wire, 3-wire or 4-wire RTD or
linear resistance
I1: Input 1
Voltage input
(single-pole or two-pole)
4.6 Connecting the SITRANS TF dual chamber housing
⑤
.
TC (internal CJC or
external 2-wire or 3-wire CJC)
3-wire or 4-wire potentiometer
Connecting
41