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Introduction
A temperature sensor is a device that gathers data concerning the temperature from a source and converts it to a form that can be understood either by an observer or anther device. It measures the temperature of a medium. The sensors are used for different purposes from the simple home use to extremely accurate and precise scientific use.
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Snap-action type thermostats are commonly used in our homes for controlling the temperature set point of ovens, irons, immersion hot water tanks and they can be found on walls to control the domestic heating system. But it has large hysteresis range on the opening and closing of electrical contracts. That’s why commercially available bi-metallic thermostats have temperature adjustment screws, by which it is possible to adjust the temperature at desired level and pre-set hysteresis level.
2. Thermocouple
Thermocouples are the most common temperature measuring device. It consists of two dissimilar metals, joined together at one end.
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- Thermocouple is extensively used in steel processing, turbine and diesel engine for temperature measurement
- It is used in gas feed heat appliances such as ovens and water heaters.
- It is used in power production.
- A thermocouple can be used as a vacuum gauge over the range of approximately 0.001 to 1 torr absolute pressure
- Thermoelectric cooling
- Medical equipment and Packaging equipment
3. Thermistor:
A thermistor is type of resistor whose resistance varies significantly with the temperature. They are widely used as inrush current limiters, temperature sensors, self-resetting overcurrent protectors and self-regulating protectors.
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