Glossary / FAQs / LexiconTemperature measuring equipment

Bimetallic measuring element

A strip composed of two different metals which are welded together.
The two different heat expansion coefficients of these metals lead to a temperature-dependent curvature of the welded metal. This curvature respectively deflection is a measure of the upcoming temperature.


For the measurement of the current and highest temperature of the preceding measurement period.
A pin is pushed forward through the meniscus of the mercury filament by raising temperature, and remains with the maximum temperature value when the temperature drops. The thermometer is used in horizontal position.

Extreme Thermometer

Combination of a min.- and a max. -thermometer to measure the current, the lowest and the highest temperature of the preceding measurement period.


For the measurement of the current and lowest temperature of the preceding measurement period.
A pin in the alcohol filament is pushed back by the surface tension of the alcohol, and remains with the minimum temperature value when the temperature increases.

Perceived Temperature

The ambient temperature as perceived by the human body affected by the wind. It is calculated from the “wind-chill” factor.

Pt 100 Sensor

Is a temperature sensor with a measurement coil made of platinum wire. The temperature-dependent resistance-change of the platinum wire is used as measure for the temperature.100 Ω for 0 °C is used as basic value. The resistance-change is defined in the DIN IEC 60751 standard.

Soil Surface Thermometer

Measurement instrument to measure the temperature above the soil, preferably at a height of 5 cm. The German Weather Service uses sensors without radiation protection only to measure the minimum temperature.

Soil Thermometer

Measurement instrument to measure the air temperature in soil at different depths.

Temperatur transmitter

Electrical temperature measurement instrument with an electrical measured value output.


Measurement instrument which mechanically records the temperature as a function of time.


General term for a temperature measurement instrument.


Kelvin (K)
Used since 1976 as the legal unit of temperature.
It starts at -273.15 °C.
Celsius (°C)
Common temperature degree scale in which the melting point of ice is 0 °C and the boiling point of water is 100 °C on a thermometer at an air pressure of 1013.2 hPa.
Fahrenheit (°F)
Temperature scale frequently used in Anglo-Saxon countries.
On this scale, the melting point of ice is 32 °F.
Conversions°C = K -273.15 K
K = °C +273.15 °C

°C = – (°F -32)
°F = 32 + – °C


The loss of heat by the human body through the wind.
The “perceived temperature” is derived from this factor.

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