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The true reliability of the SITRANS TH420 is exemplified by the dual sensor input with 4-wire sensor connection and hot backup function. In case of a sensor failure, the transmitter seamlessly switches to the second sensor, so that the data is recorded continuously and without any loss.


  • High availability during measurement
  • 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

Additional Info

– HART® dual input transmitter
– Hot backup function
– Drift detection function
– Diagnostics LED
– Support two four-wire RTD/TC/mV and resistances
– Supports Callender-van-Dusen
– HART® 7 + SIL 2/3 (IEC 61508)

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