Siemens SITRANS Series Compact Operating Instructions page 9

The output signal is a load-independent direct current from 4 to 20 mA in accordance with the
input characteristic, superimposed by the digital HART signal.
The dual input mode also supports drift detection of the inputs, whereby maintenance intervals
can be more easily planned.
Transmitters of the "intrinsically safe or Zone 2 Increased Safety" type of protection can be
installed in hazardous areas. The device meets the requirements of the EU Directive 2014/34/
EU (ATEX), the FM and CSA regulations as well as other national approvals, e.g. EACEx,
NEPSI, KCs, Inmetro.
SITRANS TF320/TF420
The SITRANS TF temperature transmitter converts sensor signals into a load-independent DC
signal according to the sensor characteristic. The following sensors and signal sources can
be connected to the input block:
● Resistance thermometer
● Thermocouples
● Resistance-based sensor/potentiometer
● DC voltage sources
The output signal is a load-independent direct current from 4 to 20 mA in accordance with the
input characteristic, superimposed by the digital HART signal.
Transmitters of the "intrinsically safe or Zone 2 Increased Safety" type of protection can be
installed in hazardous areas. The device meets the requirements of the EU Directive 2014/34/
EU (ATEX), the FM and CSA regulations as well as other national approvals, e.g. EACEx,
NEPSI, KCs, Inmetro.
SITRANS TH320/TH420/TR320/TR420/TF320/TF420
Compact Operating Instructions, 03/2018, A5E41865021-AA
Introduction
1.5 Intended use
9