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

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Type A temperature sensor with an interchangeable measuring insert and adjustable immersion depth
Type A – RT-A resistance thermometer or TC-A thermocouple, both with an interchangeable measuring insert

Application

Correct positioning of the measuring point is essential for accurate temperature measurement. Type A allows the immersion depth to be adjusted during installation. If the measuring point is positioned too close to the pipe wall, heat conducted through the protection tube can influence the measured temperature. The protection tube passes through a compression fitting or an adjustable flange where required—and is secured at the specified immersion depth.

Type A is suitable for measuring the temperature of air, steam, gases, water and oils in closed pipes and tanks. It can be used at pressures up to 50 bar and flow velocities up to 25 m/s, where the mechanical load on the protection tube becomes the limiting factor.

Routine calibration or sensor replacement normally requires the process connection to be opened. With Type A, the measuring insert can be removed and replaced while the protection tube remains installed in the process, reducing downtime and eliminating the need to disturb the pressure boundary.

The operating temperature depends on the measuring principle selected. RT-A, fitted with a Pt100 or Pt1000 resistance element, measures temperatures up to 600 °C. TC-A, using a Type K, J, N, T or E thermocouple, extends the measuring range to 1150 °C.

Where it is used
Process pipelines, tanks and pressure vessels
Boiler and steam systems
Heat exchangers and process equipment
District heating and hot water networks
Refineries, LNG and offshore process systems

Properties

Sensor element
RT-A with Pt100 or Pt1000 to IEC 60751 for temperatures up to 600 °C, or TC-A with type K, J, N, T or E to IEC 60584-1 for temperatures up to 1150 °C.
Measuring insert
Interchangeable measuring insert for calibration or replacement without removing the entire sensor assembly from the process.
Process connection
Compression fitting or adjustable flange for setting the immersion depth during installation.
Protection tube
EN 1.4571 (AISI 316Ti) stainless steel for corrosion resistance. Heat-resisting grades available for higher-temperature applications.
Signal processing
Head-mounted transmitter option for direct 4–20 mA output.
Standards
Mechanical and thermal stress to DIN 43772 (RT-A). Construction to DIN EN 50446 (TC-A).