Rüeger SA launches high-accuracy process temperature sensor

This modern version of a constant-volume gas thermometer uses a thin-film pressure gauge to measure the pressure in an argon-filled cartridge acting as the sensing element, to which it is connected via a stainless steel capillary.

The measurement range may cover between -180°C and +750°C (with special ranges up to 1050°C) and is easily adapted to customer needs by adjusting the initial filling pressure. The size of the gas cartridge and the length of the capillary are both customised to the application.

The ThermoHybrid achieves an accuracy of ± 1°C at a temperature of 750°C, which makes it about four times more accurate than a thermocouple. For a measurement range of up to 150°C, accuracy can be increased to ± 0.1°C which puts it into competition with a Pt100 class 1/10 DIN. Moreover, the ThermoHybrid shows an extremely small drift over time.

The ThermoHybrid can measure average temperatures (over a cross section or along a defined path), as the indicated temperature always corresponds to the average temperature of the gas cartridge. The length of the gas cartridge can easily be adapted to the application and may range from several centimetres to several metres.

Signal output is either analogue (4-20 mA or 0-10 V) or digital (RS485 or CAN-Bus).

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