A regulating, substantially constant temperature of the surface area (14) as heat increases is detected as the boiling temperature for the liquid medium.

Write this temperature down as the basic warm temperature.

The ambient temperature (green) was monitored as reference.

The ambient temperature (green) was monitored as reference.

Note: The ambient temperature (Ta) is used as the reference temperature.

Note: The ambient temperature (Ta) is used as the reference temperature.

The device provides a means of indicating the physical value in the form of the temperature of a surface (2).

The temperature for judging the deterioration state of the accumulator is set in advance as a reference temperature.

Until recently, -40 °C was used as the lowest test temperature (ambient temperature), today this temperature is moving more and more towards -60 °C.

  Then, in a preliminary burning step, preliminary burning is performed at a temperature below the softening point of the sealing material as the highest temperature.

Advantageously, the invention provides that the evaluation temperature (Tev) is determined by monitoring the deflection and by defining an extreme value (Tmax, Tmin) of the deflection as the evaluation temperature (Tev).

Tenerife experiences a spring like temperature throughout the year, with the average temperature between 20 and 22ºC.

These "outer" temperature sensors act as control temperature sensors.

This temperature range is referred to hereinafter as the ambient temperature range of the object.

A temperature sensor measures the ambient temperature or the temperature of the power generator, and outputs the measured temperature as temperature information.