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How to test a thermistor?

Thermistors, derived from the term thermaIly sensitive resistors, are a very accurate and cost- effective sensor for measuring temperature. Available in 2 types, NTC (negative temperature coefficient) and PTC (positive temperature coefficient), it is the NTC thermistor that is commonly used to measure temperature.Aug 28, 2018

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The thermistor is a common electrical component used for measuring temperature. A thermistor is essentially just a temperature sensitive resistor. Most thermistors have a negative temperature coefficient (NTC), meaning the resistance of the thermistor decreases as temperature rises. One problem often encountered when using thermistors for measuring temperature is that their temperature/resistance curve is not linear (as shown in the graph below).

What is a thermistor and how does it work?

  • NTC Thermistors. An NTC thermistor is a thermally sensitive resistor whose resistance exhibits a large,precise and predictable decrease in resistance,as the core temperature of the element increases over ...
  • Characteristics of NTC Thermistors. ...
  • Temperature Response. ...

What is thermistor used for?

  • A thermistor is a resistor, or type of sensor used to regulate and measure temperature, such as heat and cold. A thermistor is made up of ceramic with a high precision at a specific temperature level.

Where are thermistors used?

  • The word is a portmanteau of thermal and resistor. Thermistors are widely used as inrush current limiters, temperature sensors (negative temperature coefficient or NTC type typically), self-resetting overcurrent protectors, and self-regulating heating elements (positive temperature coefficient or PTC type typically).

How does a thermistor work?How does a thermistor work?

How a Thermistor Works. Thermistors are variable resistors that change their resistance with temperature. They are classified by the way their resistance responds to temperature changes. In Negative Temperature Coefficient (NTC) thermistors, resistance decreases with an increase in temperature.

image-How to test a thermistor?
image-How to test a thermistor?
Related

What is the difference between NTC and PTC thermistors?What is the difference between NTC and PTC thermistors?

In Negative Temperature Coefficient (NTC) thermistors, resistance decreases with an increase in temperature. In Positive Temperature Coefficient (PTC) thermistors, resistance increases with an increase in temperature. NTC thermistors are the most common, and that’s the type we’ll be using in this tutorial.

Related

How do you calculate the beta constant of a thermistor?How do you calculate the beta constant of a thermistor?

1/T = 1/T0 + 1/B * ln (R/R0) The variable T is the ambient temperature in Kelvin, T0 is usually room temperature, also in Kelvin (25°C = 298.15K), B is the beta constant, R is the thermistor resistance at the ambient temperature (same as Rt above), and R0 is the thermistor resistance at temperature T0.

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How many ohms should a thermistor resistance be?How many ohms should a thermistor resistance be?

For example, if the specified resistance at 25°C for a thermistor with 10% tolerance is 10,000 ohms then the measured resistance at that temperature can range from 9,000 ohms to 11000 ohms. A value that represents the relationship between the resistance and temperature over a specified temperature range.

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