Information About Thermistor Sensor

A thermistor sensor works as a thermal resistor. Essentially, it produces a voltage that is in accordance with Ohm's law. The voltage is proportional to the electric current and varies with temperature. Thermistor sensors are made from a polymer or ceramics and operate with high precision with a limited temperature range.

  1. Types

    • Thermistors operate in either direction of temperature. A positive temperature thermistor operates when the temperature rises, while a negative temperature thermistor functions when the temperature goes down.

    Function

    • A thermistor sensor works as a resistor because as the temperature changes, the number of electrons in motion also changes. This causes the charge to adjust. The more charge, the more current that passes through the device.
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    Misconceptions

    • Despite many statements to the contrary, thermistors are not self-heating. They are passive devices that conduct energy supplied by an external circuit. As current passes through the thermistor sensor, it will raise the temperature.

    Significance

    • Thermistor sensors are used commonly in automotive parts, copy machines and thermostats. They monitor temperatures in coolants, oil and materials that are subject to varying heat or cooling.

    History

    • In 1833, Michael Faraday discovered that silver sulfide worked as a semiconductor. He found that the resistance of the material decreased as temperatures increased. Using the idea, Samuel Rubin invented the thermistor sensor in 1930 for application in commercial industry.
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20th Jan 2015

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