Contents
How do you choose a thermistor?
5 Essential Considerations When Selecting an NTC Thermistor
- Temperature Range. When choosing a temperature sensor, the first consideration should be the temperature range of the application.
- Accuracy.
- Stability.
- Packaging.
- Noise Immunity.
Can thermistor be used at high temperature?
Thermistors are ideal when measuring a single point temperature that is within 50°C of ambient. If the temperatures are excessively high or low, a thermistor will not work. While there are exceptions, most thermistors work best in the range between -55°C and +114°C.
What is the beta value of a thermistor?
A thermistor’s “b” value, or beta value, is an indication of the shape of the curve representing the relationship between resistance and temperature of an NTC thermistor.
What is the material constant of an NTC thermistor?
The material constant of an NTC thermistor is a measure of its resistance at one temperature compared to its resistance at a different temperature. The reference temperatures used in the following formula for Ametherm’s thermistors are 298.15°K and 348.15°K.
What is the nominal resistance of an ametherm thermistor?
This will allow for the calculation of the needed nominal resistance value at a given temperature. Ametherm offers an entire range of nominal resistance values for their NTC thermistors. The standard reference temperature is 25°C, but buyers and designers can request different temperatures.
What should be the power resistance of a chip thermistor?
When looking at product specification sheets, Ametherm provides standard tolerances. For example, disc or chip thermistors usually have a zero-power resistance distribution of ± 1% to ± 20%. To save on costs, Ametherm recommends specifications of the broadest possible tolerance that is relevant to intended use.