{"id":1267,"date":"2023-11-08T09:00:29","date_gmt":"2023-11-08T14:00:29","guid":{"rendered":"http:\/\/blog.wika.com\/us\/\/?p=1267"},"modified":"2024-02-22T09:11:44","modified_gmt":"2024-02-22T14:11:44","slug":"overview-temperature-measurement-bimetal-thermometers","status":"publish","type":"post","link":"https:\/\/blog.wika.com\/us\/products\/temperature-products\/overview-temperature-measurement-bimetal-thermometers\/","title":{"rendered":"What Are Bimetal Thermometers, and When to Use Them"},"content":{"rendered":"

Bimetal thermometers are tried-and-true instruments for measuring temperature in a wide range of industrial applications, combining low cost and low maintenance with easy installation, use, and calibration.<\/strong><\/p>\n

Sometimes a measurement technology is so simple yet effective that it becomes \u2013 and remains \u2013 the standard for decades. Such is the case with the bimetal thermometer (also called bimetallic thermometer), patented<\/a> in the late 1800s.<\/p>\n

Operating Principle of Bimetal Thermometers<\/strong><\/h2>\n

Bimetal thermometers work on the principle that solids expand or contracts depending on the temperature. As the name implies, these temperature measurement devices contain two strips of metal, each with a different expansion coefficient. This means that at the same temperature, the two metals will expand or contract at different rates. The materials are usually steel and copper or steel and brass<\/span><\/span>, depending on the measuring range.<\/p>\n

The two strips are welded or bonded together, formed into a helical or spiral coil, and placed in the thermometer\u2019s stem. The bimetallic coil is affixed at the stem end, while the other end rotates and moves the pointer. As the temperature increases, the strip bends toward the metal with the lower temperature coefficient and creates a rotational movement in one direction. Conversely, as the temperature decreases, the strip bends toward the metal with the higher temperature coefficient and creates a rotational movement in the other direction.<\/p>\n

Benefits of Using Bimetal Thermometers<\/strong><\/h2>\n

Because these thermometers use common metals and a simple mechanical technology, they are among the least expensive industrial thermometers available. These dial thermometers are also durable, giving them an advantage over both liquid-expansion and gas-actuating thermometers.<\/p>\n\n

Easy recalibration with zero point setting<\/p><\/div>\n \n

Reasons to use bimetal thermometers:<\/p>\n