Bimetal vs. gas-actuated thermometers | What is the difference?

In industrial temperature measurement, primarily two types of dial thermometers are used: bimetal and gas-actuated thermometers. Which measuring principle should be used depends on a number of different factors, such as response time, temperature limits & application range.
Bimetal thermometers (bit.ly/3mm7C0M) operate with a measuring system in the form of a helical or spiral tube. The measuring system consists of two sheets with different expansion coefficients, which are inseparably joined. Through the mechanical deformation of the bimetal strip, a rotational movement results, caused by temperature changes. This movement is transferred through a pointer shaft to the pointer of the thermometer.
The measuring system of gas-actuated thermometers (bit.ly/32g4Kf7) consists of a stem, capillary and Bourdon tube in the case. These parts are combined to form a single unit. The entire measuring system is filled with an inert gas under pressure. Any change in temperature causes a change in internal pressure in the stem. The pressure deforms the measuring tube and the deflection is transferred to the pointer via a movement.
But how do I find the right thermometer for my area of application?
Due to their simpler design, bimetal thermometers are considerably less expensive. An important advantage of gas-actuated thermometers is their fast response time. Further advantages: Via a capillary with a length of up to 60 metres or more, gas-actuated thermometers can also be mounted remotely from the measuring point. Liquid filling of the gas-actuated thermometers is possible even at medium temperatures above 250 °C.
So you see: The final decision as to which dial thermometer will be used depends on a number of different factors. Our specialists are happy to advise you in the selection of the right thermometer.
📖 You can also find interesting posts on this subject in our WIKA blog.
Selection criteria for dial thermometers - response time: bit.ly/32f3u6u
Selection criteria for dial thermometers - process temperature: bit.ly/2MK94K6
🛒 Order dial thermometers now, directly from our online shop: bit.ly/32cZ9Rc
🌐 Dial thermometers from WIKA can be found here: bit.ly/2LhjduG
🌐 Gas-actuated thermometers with capillary: bit.ly/32q6ulR
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[@user-ie2tw1yt1u]

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[@alexanderfox5998]

Ожидал, что ролик все таки на русском будет...