Revealing the Resistance of Temperature Measuring Thermistors

April 9, 2024

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Thermistors are components that use the characteristic of materials changing their resistance values with temperature to achieve temperature measurement. Common thermistor materials include platinum, nickel, iron, cadmium, etc., and different materials have different resistance characteristics.

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The relationship between the resistance of a temperature sensitive thermistor and temperature can be described by some mathematical models. Among them, the commonly used is the Steinhart Hart model, which represents the relationship between resistance and absolute temperature (Kelvin) as a three parameter equation. According to this model, the specific resistance value at temperature can be obtained through calculation or table lookup.

However, due to the different characteristics and parameters of thermistors produced by different manufacturers, there may also be certain differences in the resistance value of temperature measuring thermistors. Generally speaking, the resistance of a thermistor shows a linear increase in the relatively low temperature range, while it rapidly increases at high temperatures. Therefore, when selecting a thermistor, it is necessary to determine the appropriate resistance range based on specific application scenarios and requirements.

In addition, it should be noted that there is also a certain correlation between the resistance value of the temperature sensing thermistor and the influencing factors of its surrounding environment. For example, factors such as gas, humidity, and pressure in which a thermistor is located may have a certain impact on its resistance value, so relevant calibration and compensation are needed in practical applications.

In summary, the resistance value of a temperature sensing thermistor is determined based on the relationship between the characteristics of the thermistor material and temperature, and the resistance value may vary between different materials and environments. Therefore, when selecting and applying temperature sensing thermistors, it is necessary to comprehensively consider factors such as their resistance characteristics, sensing range, and environmental adaptability to ensure accurate and reliable temperature measurement results.