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WIKA Instrument, LP

Tel.:
1-888-945-2872
Fax:
1-770-338-5118
info@wika.com

For many years, WIKA has been among the leading manufacturers of high-quality industrial temperature measuring instruments. Our experience and know-how in the manufacture of temperature probes sets us apart.

What is a temperature probe?

The term temperature probe, with electrical thermometers, describes a unit from one or more temperature probe elements and a usage-specific armour, which can consist of, for example, connection head, neck tube, thermowell or a hand grip. The sensor element built into the temperature probe takes the actual measurement and converts the measured temperature into an electrical signal.

With WIKA, temperature probe in industrial temperature measurement are essentially divided between the following groups:

Temperature probes with thermocouples

Temperature probes with thermocouples are suitable for the measurement of high temperatures of up to +1,600 °C.

Thermocouples consist of two different metals which are bound together to form the 'thermocouple'. The connection point (hot junction) represents the actual measuring point of the temperature probe, the wire ends are designated as the cold junction. When there is a temperature change at the measuring point of the temperature probe, due to the different electron densities of the metals and the temperature difference, a voltage is generated between the hot and cold junctions. This is approximately proportional to the temperature of the measuring point (Seebeck effect).

The low diameter of the sheathed thermocouple of a temperature probe enables a response time that is faster than is possible with a resistance thermometer.

Temperature probe with resistance thermometers

resistance thermometer has its strengths in the low and medium temperature ranges of -200 … +600 °C. In industry, mainly Pt100 or Pt1000 measuring resistors are used. If the sensor of the temperature sensor detects an increase in temperature, then its resistance also increases (positive temperature coefficient). The resistance of a Pt100 resistance thermometer at 0 °C is 100 Ohm, for a Pt1000 resistance thermometer it is 1,000 Ohm.


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