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TYPES OF TEMPERATURE SENSOR

APPLICABLE TEMPERATURE RANGE

TYPES OF TEMPERATURE SENSOR
(1) PLATINUM RTD
Exploiting the theory that electric resistance value of a platinum wire or pattern is changed by a temperature change. This method features high accuracy. This is used for precise industrial temperature control.
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(2) THERMOCOUPLE
This is widely used for industrial temperature control especially in high temperature.
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(3) GLASS THERMOMETER (MERCURY, ALCOHOL)
Applying thermal expansion of mercury or alcohol.
(4) BI-METAL THERMOMETER
Applying the theory that when two different metals are attached and heated, it warps because of the different thermal expansion coefficients.
(5) PRESSURE THERMOMETER
Applying thermal expansion of liquid or gas.
(6) THERMISTOR
This is a kind of RTD. As temperature goes up, the resistance valueof an element decrease. (-50 to 350) It is mainly applied for Home Electronics, cars, and OA machines. It is cheap but not as accurate as platinum RTD.
(7) INFRARED THERMOMETER
Measuring infrared radiations emanating from substances and convert it into temperature.

(7) is non-contact-type thermometer
(3)(6) Those are rarely used for industrial temperature control.
(1)(6) are contact-type thermometers.
Our company deals with (1), (2).

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