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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 plants and industrial process control
Power generation and boiler plant
District heating and energy distribution
Waste incineration plants
Kilns and furnaces in cement, brick and glass
Refineries, offshore and LNG installations

Properties

Sensor and measurement
Sensor element
RT-AUI: one or two Pt100 or Pt1000 elements to IEC 60751. TC-AUI: type K, J, N, T or E to IEC 60584-1. A second element gives you a standby or a redundant reading in the same probe.
Tolerance class
RT-AUI: class A, or class B 1/1, 1/3, 1/6 or 1/10 DIN. TC-AUI: class 1 or 2. Higher accuracy classes for applications where even small deviations matter.
Conductors
RT-AUI: 2-, 3- or 4-wire — 3- and 4-wire compensate for cable resistance on longer cable runs. TC-AUI: one or two thermocouples.
Media temperature
RT-AUI: +180, +250, +400 or +600 °C. TC-AUI: +600, +800, or up to 1150 °C in a protection tube.
Pressure and flow
Up to 50 bar and flow velocities up to 25 m/s.
Probe and mounting
Measuring insert
Fixed. The complete sensor is removed as one assembly for calibration or replacement.
Process connection
Compression fitting in ¼”, ½”, ¾” or 1″ BSP, or ½” NPT. An adjustable flange or a thermowell where the installation calls for one.
Thermowell
MA-PW2 or MA-PW3. The thermowell provides the process connection and stays installed when the sensor is removed, preserving both the immersion depth and the pressure boundary.
Protection tube
Stainless steel EN 1.4571 (AISI 316Ti) up to 850 °C as standard, heat-resisting grades above that. See thermowell materials.
Diameter
Ø6, Ø8, Ø9, Ø11 or Ø15 mm, matched to the existing bore. Other diameters on request.
Immersion length L1
50, 100, 150, 200, 250 or 300 mm. Other lengths on request.
Connection head
Enamelled aluminium as standard, with stainless steel, sanitary stainless steel or plastic on request. Screw cap, hinged lid, or a built-in display for local indication. IP54 to IP68.
Cable and signal
Electrical connection
M12 or Harting plug, or pre-mounted cable in silicone to 180 °C or PTFE to 250 °C. Cable entry M20×1.5.
Cable gland
Plastic, nickel-plated brass or stainless steel. None if no cable is pre-mounted.
Signal processing
Ceramic terminal block in the head, flying leads prepared for a transmitter, or a programmable head-mounted transmitter with a 4–20 mA output for longer cable runs.
Standards
Standards
Mechanical and thermal stress to DIN 43772 (RT-AUI). Construction to DIN EN 50446 (TC-AUI).
Ordered with the sensor
Calibration
In-house or accredited calibration, normally in three points.
Enhanced performance
Cryogenic treatment for service below −50 °C, down to −196 °C, and ageing treatment for long-term stability.
Documentation
3.1 material certificate, certificate of origin, and certificate of conformity.