TYPES OF TEMPERATURE SENSOR
APPLICABLE TEMPERATURE RANGE
|(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.
This is widely used for industrial temperature control especially in high temperature.
|(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.
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).