Characteristics And Applications Of Bimetallic Thermometers


A bimetallic thermometer is a mechanical thermometer that has two strips of different metals that have different coefficients of expansion. These metals which are usually steel and copper in the device help in converting the temperature into mechanical displacement. They are attached together by wielding on its length and will expand at different rates as they are heated. Owing to the different properties in the metals, the heat will cause them to bend one way or the other depending on the applied temperature. 

Applications of bimetallic thermometers

Bimetallic thermometers are less expensive and they are durable. At the same time, they are purely mechanical devices that are easy to use. Many industrial sectors use a leading industrial bimetal thermometer that displays the current temperature on their dial. The device is widely used in food processing units, process temperature measurement, wastewater treatment, boiler systems, refineries, and household devices like oven, air conditioner, and other kitchen appliances.

Types of bimetallic strips

There are generally two types of bimetallic strips. They are:

  •  Spiral types bimetallic strip: It is used for measuring the ambient temperature. The metal deformation will occur due to the thermal expansion property of the metal during different levels of temperature.

  •  Helical types bimetallic strip: In this system, the helix shape strip is connected to the pointer. The variation of temperature is identified by the deflection of the metal strip.

Why bimetallic thermometers?

Besides its capability to indicate the temperature, a bimetallic thermometer serves many benefits. This may include:

  • Does not require a power source
  •  Easy to use
  • It withstands 50% over a range in temperature
  • It can be used wherever a mercury-in-glass thermometer is used

If your business requires a NIST certified instrument, buy a leading industrial bimetal thermometer from a trusted supplier.

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