4.2 SITRANS TH320/TH420
4.2.1 Application
SITRANS TH320
The SITRANS TH320 transmitter can be used in all sectors. Its compact size means that it can be
installed in connection heads of type B (DIN 43729) or larger. Due to its universal input stage,
the following sensors and signal sources can be connected:
• Resistance thermometer (2-wire, 3-wire, 4-wire connection)
• Thermocouples
• Linear resistance, potentiometer and DC voltage sources
Without HART communication interface:
• The output signal is a load-independent direct current from 4 to 20 mA in accordance with
the input characteristic.
With HART communication interface:
• 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 "Intrinsic safety 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, Inmetro.
SITRANS TH420
The SITRANS TH420 transmitter with two inputs can be used in all sectors. Its compact size
means that it can be installed in connection heads of type B (DIN 43729) or larger. Due to its
universal input module, the following sensors and signal sources can be connected in redundant
operation (high input availability):
• 2 resistance thermometers (2-wire, 3-wire, 4-wire connection)
• 2 thermocouples
• 1 thermocouple and 1 resistance thermometer (2-, 3-, 4-wire connection)
• 2 linear resistors, potentiometer and 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.
The dual input mode also supports drift detection of the inputs, whereby maintenance intervals
can be more easily planned.
Transmitters of the "Intrinsic safety 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,
Inmetro.
Description
4.2 SITRANS TH320/TH420
SITRANS TH100/TH320/TH420/TR320/TR420/TF320/TF420 with 4 to 20 mA/HART
34 Operating Instructions, 05/2020, A5E41864807-AB
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