Siemens SITRANS Series - Page 36

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For devices with HART communication, connect a ≥ 250 Ω resistor.
3. Take the polarity into account. The device has reverse polarity protection.
Connecting
4.4 Connecting TR320
SITRANS TH320/TH420/TR320/TR420/TF320/TF420
36 Compact Operating Instructions, 03/2018, A5E41865021-AA