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Instrument Types Of Thermometers
Oct 31, 2017

Rotary Thermometer

A rotating thermometer is made of a curling bimetallic sheet. The bimetal piece is fixed at one end and the other end is connected with the pointer. Because of the different expansion degree of the two metal sheets, at different temperatures, the degree of curl is different, the pointer then refers to the different position on the dial, from the reading on the dial, we can know the temperature.

Semiconductor thermometer

The resistance of semiconductors is different from that of metals, and when the temperature rises, the resistance decreases and the variation amplitude is larger. Therefore, a small amount of temperature changes can also make a significant resistance to change, the thermometer made of high precision, often referred to as a temperature sensor.

Thermocouple Thermometer

Thermocouple thermometers are made up of two different metal wires followed by a sensitive voltage meter. At different temperatures, metal contacts produce different potential differences at both ends of the metal. The potential difference is very small, so the need for a sensitive voltage meter can be measured. The temperature will be known by the reading of the voltage meter.

Light gauge Pyrometer

If the temperature of the object is high enough to emit a large amount of visible light, the temperature can be determined by measuring its heat radiation, which is the light measuring thermometer. This thermometer is made mainly of a telescope with a red filter mirror and a set of circuits with a small bulb, a galvanometer and a variable resistor. Before use, the relationship between the temperature of different luminance of the filament and the reading on the current meter is established. When used, the telescope to the test, adjust the resistance, so that the brightness of the lamp with the same as the test, then from the current meter can be read out of the temperature of the test material

LCD Thermometer

The phase change temperature of liquid crystals made of different formulations is different, and their optical properties change when their phase changes, which makes the liquid crystal appear color changed. If the liquid crystal of different phase change temperature is coated on a piece of paper, the change of liquid crystal color, then can know the temperature. The advantage of this thermometer is that it is easy to read, and the disadvantage is that it is not accurate enough to be used in aquarium to indicate water temperature.


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