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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.