SITRANS TF320/420 - SIL Temperature Transmitters

Why SITRANS TF320/TF420?

SITRANS TF320 and TF420 combine flexible sensor connectivity, robust field housing and simple local or remote configuration. Both are available in single- or dual-chamber aluminum or stainless-steel versions. TF320 covers standard measurement points with one universal input. TF420 adds two separately configurable inputs with hot backup for higher availability.

Maximize uptime

Hot backup in SITRANS TF420 automatically switches to a second sensor if the primary fails, helping keep critical processes running and reducing unplanned downtime.

Improve plant safety

SIL 2/3 certification and broad Ex approvals make transmitters suitable for safety‑critical applications and extreme environments down to −50 °C. Optional internal surge protection up to 6kV (dual chamber enclosure).

Adapt to many measurement tasks

With support for RTDs, thermocouples, resistance and mV signals, one transmitter family can be used across a wide range of temperature applications.

Featured capabilities

Support universal sensor inputs

Connect RTDs, thermocouples, resistors, potentiometers and millivolt sources for flexible temperature measurement across the plant.

Detect sensor drift and calibrate

Use Callendar‑van‑Dusen calibration with sensor drift detection in TF420 to sustain accuracy and plan maintenance efficiently.

Access NE107 diagnostics

Leverage HART 7 and NE107‑compliant diagnostic alarms to surface actionable status data locally or via the control system.