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Temperature Sensor – Type D (RT-D/TC-D)

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Type D temperature sensor with a tapered weld-in thermowell, extension neck and aluminium connection head
Type D – RT-D resistance thermometer or TC-D thermocouple, both with a solid weld-in thermowell and an interchangeable measuring insert

Application

Type D is a temperature sensor for measuring steam, water and gases in pipelines and vessels at high pressure and flow velocity. It is used in boilers, power plants and chemical process systems, where the measuring point must withstand the mechanical loads imposed by the flowing medium.

The assembly includes a tapered thermowell machined from solid bar stock and welded into the installation. Its material and dimensions are selected for the combined pressure, temperature and flow conditions, together with the corrosion exposure. The permissible operating load therefore depends on the thermowell configuration and the application.

The interchangeable measuring insert allows calibration or replacement without removing the thermowell from the process. The welded connection remains undisturbed, keeping the pipeline or vessel sealed during this work.

RT-D uses a Pt100 or Pt1000 resistance element, while TC-D uses a type K, J, N or E thermocouple. Both are supplied as complete assemblies with a Type D weld-in thermowell.

Where it is used
Boiler feedwater systems
Steam and superheated steam pipelines
High-pressure gas pipelines
Chemical process pipelines and vessels
District heating and hot-water systems

Properties

Sensor element
RT-D with Pt100 or Pt1000 to IEC 60751, or TC-D with type K, J, N or E thermocouple to IEC 60584-1.
Temperature capability
Configurations are available for measurement up to 600 °C with RT-D or 650 °C with TC-D, subject to the thermowell’s permissible operating conditions.
Measuring insert
Interchangeable measuring insert for calibration or replacement while the thermowell remains installed.
Thermowell
The assembly includes a tapered Type D weld-in thermowell machined from solid bar stock for high-pressure service.
Process connection
The thermowell is welded into the pipeline or vessel.
Operating conditions
Permissible pressure and flow velocity depend on the thermowell material, dimensions, process medium and temperature.
Materials
Thermowell materials include EN 1.7335, EN 1.0460, EN 1.4571 (AISI 316Ti) and EN 1.4404 (AISI 316L), selected for the process conditions.
Signal processing
Head-mounted transmitter option for direct 4–20 mA output.
Standards
Thermowell dimensions and permissible mechanical and thermal loading follow DIN 43772.