SITRANS TR320/420 - Rail-Mount Temp Transmitters

Why SITRANS TR320/TR420?

Designed for DIN rail mounting, SITRANS TR320 and TR420 make temperature measurement easier in control cabinets and protective boxes. TR320 covers standard single-input applications. TR420 adds dual-input operation, hot backup and drift detection for higher availability. Universal inputs, HART communication and SIL 2/3 options help standardize instrumentation in demanding plants.

Maximize uptime with hot backup function

For high-availability applications, TR420 automatically switches to a second sensor if the first fails. Measurement continues without data loss. This helps avoid process interruptions and reduces manual intervention.

Simplify integration with universal inputs

One rail-mount platform supports RTD, thermocouple, resistance and voltage inputs. This helps standardize installations, reduce device variants and simplify engineering, spares and operation across many measuring points.

Support functional safety requirements

Certified SIL 2/3 variants help meet functional safety requirements in safety-related temperature applications. HART 7 also supports reliable commissioning and testing throughout the device lifecycle.

Featured capabilities

Configure fast via HART 7 and SIMATIC PDM

Commission with a handheld communicator or SIMATIC PDM; settings persist in EEPROM for dependable startups.

Detect sensor drift and schedule service

Use TR420’s dual‑input mode for sensor drift detection to plan maintenance proactively and reduce downtime.

Maintain signal integrity with isolation

Rely on galvanic isolation, diagnostics LED, and test terminals to verify loop current without breaking the circuit.