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

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Type AUI temperature sensor with a fixed measuring insert, installed with a compression fitting, a flange or a thermowell
Type AUI – RT-AUI resistance thermometer or TC-AUI thermocouple, both with a fixed measuring insert

Application

Correct positioning of the measuring point is essential for accurate temperature measurement. Type AUI has a fixed measuring insert and can be installed using a compression fitting, an adjustable flange where required, or in a thermowell with a compression fitting. When used with a thermowell, the immersion depth is determined by the thermowell design rather than during installation.

Type AUI 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.

Type AUI is commonly used together with our PW2 and PW3 thermowells, where the thermowell provides the process connection and determines the immersion depth. This gives a consistent installation while allowing the complete sensor to be removed for calibration or replacement without disturbing the pressure boundary.

The operating temperature depends on the measuring principle selected. RT-AUI, fitted with a Pt100 or Pt1000 resistance element, measures temperatures up to 600 °C. TC-AUI, 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-AUI with Pt100 or Pt1000 to IEC 60751 for temperatures up to 600 °C, or TC-AUI with type K, J, N, T or E to IEC 60584-1 for temperatures up to 1150 °C.
Measuring insert
Fixed measuring insert.
Process connection
Compression fitting or adjustable flange for setting the immersion depth during installation.
Thermowell
Compatible with MA-PW2 and MA-PW3 thermowells.
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-AUI). Construction to DIN EN 50446 (TC-AUI).