Four Types Of Thermometer And Their Working Principle

Update:08 Oct 2018

A thermometer is a device that measures temperature or […]

A thermometer is a device that measures temperature or a temperature gradient. A thermometer has two important elements: a temperature sensor in which some change occurs with a change in temperature, and some means of converting this change into a numerical value. Thermometers are widely used in industry to monitor processes, in meteorology, in medicine, and in scientific research.


There are four major types of thermometers used in the industry.


Mercury thermometers are based in the physical property of that metal to expand the hotter it gets.


Other types of thermometers, often used in high-temperature / lower accuracy applications are using a Bimetal coil, an assembly that uses two different metals that expand at different rates, a process that creates “torque” or rotational force.


The electronic thermometers that typically sense the resistance of materials or the ease with which electricity flows through them and compare it to a built-in scale that correlates the two (electrical resistance & temperature), or Thermocoupling electronic thermometers that references the “hot” point we need to measure to the “cold” reference point inside the device.


Finally, infrared thermometers are using sensors that can measure the long wave/black body radiation emitted by objects.


Once assembled, the thermometer needs to be calibrated. Without calibration each thermometer would read a different temperature because of differences in the thickness of the metals and the bending of the strip. Calibration is done by rotating the whole strip/shaft/pointer assembly within the case. Our factory have huge stock of Thermometer cases for sale whenever you place the order.

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