Siemens SITRANS TH320/420 Temperature Transmitter


  • High availability during measurement by hot backup function (SITRANS TH420)
  • High reliability and long-term stability – sensor trim (Callendar-van-Dusen) and sensor drift detection (SITRANS TH420 only) for high accuracy and accelerated calibration time
  • Avoidance of production stop because of measurement failures
  • Best cost-benefit ratio for facility management
  • Cost reduction through anticipatory maintenance
  • Withstanding safety-critical environments – Extended temperature range up to -50°C and SIL2/3 approvals

Siemens SITRANS TH320/420 Temperature Transmitter seamlessly integrates precise temperature measurement with intelligent capabilities, suitable for any temperature and environmental condition. Real-world reliability is assured, with the TH420, for instance, offering a dual sensor input with a 4-wire sensor connection and a hot backup function. In the event of a sensor failure, the transmitter automatically switches to the second sensor, ensuring continuous and uninterrupted data recording.


Input Resistance thermometers, thermocouples, resistance-type sensors, DC sources
Output 4 … 20mA (SITRANS TH320), HART (SITRANS TH320/420)
Approvals ATEX, IECEx, FM, CSA
EACEx, NEPSI, Inmetro
Operational temperature Standard: -50 … +85 °C (-58 … +185 °F)
SIL: -40 … +80 °C (-40 … 176 °F)
Certificates SIL 2/3


Siemens Sitrans TH320-TH420 Temperature Transmitter_DpstarGroup