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What are the advantages and disadvantages of bimetal thermometers??
Compared to gas-actuated thermometers, bimetal thermometers are much cheaper in terms of price. This price advantage is due to their simpler construction.
The scale ranges of bimetal thermometers are between -70 and +600 °C with accuracy classes 1 and 2 in accordance with EN 13190. For applications in which high vibrations occur, thermometers with liquid filling are used. For the filling, silicone oil is used, which damps the vibration and limits the maximum temperature to +250°C.
When the temperature changes, all types of dial thermometers react in accordance with the same principle; the expansion principle. The difference, however, is that with the bimetal thermometer the rotary movement of the bimetal can only be shown directly on the display. With the gas-actuated thermometer, on the other hand, the measured value can easily be transmitted via capillary due to its inert gas filling. Remote capillaries can even be used here to install gas-actuated thermometers up to 60 metres away from the measuring location. Expansion thermometers can also be installed via remote capillaries, but, instead of an inert gas, a filling medium is used for the measuring system, e.g. xylene or silicone oil.?
The final decision on which dial thermometer to use depends on a number of different factors. Our specialists will be happy to advise you in the selection of the right thermometer.
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