SITRANS TH320/420 - Universal Temp Transmitters

Why SITRANS TH320/420?

Built for dependable temperature measurement in harsh environments, SITRANS TH320/420 converts RTD, TC, resistance and mV signals into a stable 4–20 mA/HART output with advanced diagnostics. TH420 adds dual inputs with 4‑wire connection and hot backup so data keeps flowing if one sensor fails. SITRANS TH420 PA enhanced with Profibus PA delivers high availability and measuring accuracy. Easy commissioning with the SIMATIC CFU and effective preventive maintenance are just a few examples of the rich functionality these transmitters offer:

Universal input support for RTD, TC, resistance and mV
Advanced diagnostics for preventive maintenance
TH420 dual inputs with hot backup for high availability
Profibus PA option for enhanced integration
Quick commissioning via SIMATIC CFU

Key benefits

Boost uptime with built‑in redundancy

TH420’s dual inputs with 4‑wire connection and hot backup keep measurement continuous even if one sensor fails, preventing data gaps and unplanned stops.

Accelerate setup and operations

Configure quickly over HART with SIMATIC PDM or a handheld communicator, then rely on stored parameters for consistent performance across devices.

Advance safety and compliance

Choose the SIL 2/3 option for safety‑related applications and benefit from standards‑compliant operation in hazardous areas.

Featured capabilities

Support universal sensors

Connect RTD, TC and mV or resistance inputs to cover a wide range of processes with one head‑mount platform.

Diagnose issues early

Use the diagnostics LED, input monitoring for wire break and short circuit, and drift detection on TH420 to plan maintenance before failures occur.

Maintain signal integrity

Rely on galvanic isolation and convenient test terminals to verify loop current without breaking the circuit, ensuring trustworthy 4–20 mA output.