Designed for head-mount installation, SITRANS TH320 and TH420 combine universal sensor input, easy commissioning and seamless connectivity. TH320 efficiently covers core HART applications, while TH420 adds dual-input operation, drift detection and HART or PROFIBUS PA communication for higher availability. Versions for hazardous areas and safety-related applications support use in demanding plants.
For high-availability applications, SITRANS TH420 keeps measurement running even if one sensor fails. Its dual-input design with hot backup switches automatically to the second sensor, maintaining continuous process visibility.
Configuration via HART or PROFIBUS PA, stored parameter data and practical service functions reduce setup time and simplify replacement. This cuts commissioning effort and brings measuring points back into operation faster.
Advanced diagnostics and, on SITRANS TH420, sensor drift detection help identify sensor issues early. Combined with sensor trim for precise matching, this supports faster calibration and more targeted maintenance.
Connect RTD, TC and mV or resistance inputs to cover a wide range of processes with one head‑mount platform.
Use the diagnostics LED, input monitoring for wire break and short circuit, and drift detection on TH420 to plan maintenance before failures occur.
Rely on galvanic isolation and convenient test terminals to verify loop current without breaking the circuit, ensuring trustworthy 4–20 mA output.