Industrial Head RTD Assemblies for Process Temperature

How the assembly works

The important parts are the serviceable head, the process connection, and the RTD insert or probe below it. The head can house a terminal block for direct RTD wiring or a head-mount transmitter when the signal needs to leave as a 4-20 mA loop.

How to specify an industrial head RTD

When to choose RTD instead of thermocouple

Choose an RTD when the process is within the RTD’s useful temperature range and the priority is accuracy, repeatability, and long-term stability. Choose a thermocouple when the process runs hotter, the environment is harsher, response time is more important, or the measurement point benefits from a thermocouple junction.

Terminal block or transmitter?

A terminal-block head keeps the RTD signal available for plant instrumentation that already accepts resistance input. A head-mount transmitter converts the RTD signal to a two-wire 4-20 mA output and is useful when the cable run is long, the control system expects current loop input, or the installation needs a configured range and fault direction before shipment.

Information that prevents quote churn

For an accurate build, provide the process temperature range, required accuracy class, wiring method, immersion length, sheath material and OD, process connection, thermowell details if applicable, connection-head material, conduit entry, transmitter requirement, and any calibration or material documentation needed with the order.