NTC THERMISTOR AND ITS ADVANTAGES


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                NTC THERMISTOR

A thermistor is a type of resistor which is used to measure the changes in temperature, it is a type of variable resistive element which will change its physical resistance when it is exposed to the temperature changes

NTC THERMISTOR

A negative terminal coefficient thermistor is a two terminal component which provides a large change in resistance corresponding to the changes in absolute body temperature. It will decrease their resistive value when the operating temperature around them increases, NTC thermistors are mostly used temperature sensor because they can be used virtually in any type of equipment where the temperature has a role

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These changes in thermistor can be created either externally by a change in ambient temperature or internally by the heat created by the current passing device or by the combination of both. They are used as a resistive temperature sensor or current limiting devices its temperature sensitivity is five times more than that of silicon temperature sensor and ten times greater than resistance temperature detectors
It has negative electrical resistance when compared to the temperature large negative response of NTC thermistor means even small changes in thermistor will create significant changes in its electrical resistance and it would make it ideal for accurate temperature measurement and control

APPLICATIONS

• Temperature measurement
• Temperature control
• Temperature compensation

THERMISTOR TERMINOLOGY

Thermistor exhibits a large negative change in resistance with respect to the temperature

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25 degree Celsius is the most common temperature used to measure the thermistor resistance and the one temperature which is used to refer the resistance value of the thermistor for the NTC thermistor these values vary from less than 100Ω to greater than 1 meghaΩ
Another advantage of this thermistor is that it has high resistance these are available at base resistance 25 degrees Celsius and this high resistance reduces the effect of resistance in the lead wires

WHY THERMISTORS ARE USED

• Resolution- thermistors are used for high-resolution measurements over a limited temperature range
• Cost- while comparing to the others these are the most economical temperature sensors and there is no calibration cost for this during the installation or during its service life and if there is any failure in the field interchangeable thermistors can be taken without any calibration
• Due to its small size, it will be able to respond to very small temperature changes
• No calibration needed and it can provide resistance for a long period of time