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This article was originally published on December 19, 2022, and updated on October 8, 2025. In industries where temperature extremes, vibration, or hazardous process environments are part of daily operations, accurate and reliable temperature measurement becomes a serious challenge. In these environments, operators need instruments that deliver accurate readings from a safe distance, reducing the need to approach hazardous areas. Gas-actuated thermometers are an effective solution for these applications. Their robust design, wide measurement range, large dial size and remote mounting capabilities make them ideal when both safety and accuracy are priorities. As a global authority in pressure and temperature instrumentation, Ashcroft has helped manufacturers and process operators improve reliability and reduce downtime for more than a century. In this article, you’ll learn: How gas-actuated thermometers work When and where they are most effective Why remote mounting and thermowell selection matter Which design options can extend instrument life in extreme conditions

Gas-actuated thermometers and bimetal thermometers are both commonly used temperature measurement instruments in multiple industries due to their reliability and precision. However, they operate on different principles. No matter what industry you work in, if you require accurate temperature monitoring, understanding these thermometers can enhance both efficiency and safety in your operations. As the temperature product manager at Ashcroft – an industry leader in pressure and temperature instrumentation – I am often asked which of these instruments will be most appropriate for different applications. The answer, of course, depends on several factors. Read this article to compare the mechanics, applications, and advantages of gas-actuated and bimetal thermometers. Links to additional resources will also provide relevant information to help deepen your knowledge of temperature measurement. When you are finished reading, you will be in a better position to select the right instrument for your specific needs.

All industrial applications use some kind of temperature instrument to ensure process temperatures stay within an acceptable range. Choosing the right device can help protect your equipment and your operators from extreme temperature shifts. However, the type of instrument you use will depend on many factors, including the temperature limits of the operation and the instrument, the required output and more. As a global leader in temperature and pressure instrumentation, Ashcroft created this article as a high-level overview of industrial temperature measurement options. If you are an industry novice or just want a refresher on the basics, this can serve as a good reference piece. Read on to learn about the different types of industrial temperature instruments, how they work, where they are used and why you might choose one over another. When you are done reading, you will find additional resources related to temperature measurement that may interest you.