Testing and Calibrating Thermistors

It is important to test and calibrate thermistors before using them. These devices are small, have fast response times, and have high sensitivity, but they do present some difficulties when it comes to calibrating and testing. With proper care, it is possible to ensure that your thermistors will work as intended.

Calibrating devices in well-circulated, temperature-controlled liquids helps to make the process easier. The bath provides low viscosity, high thermal conductivity, and low electrical conductivity. The bath should be heated enough so no temperature change occurs when adding the thermistor fixture.

During the calibration process, the goal is to match the output of a sensor to a set temperature value. Calibration equations allow the calculation of a thermistors' resistance value to determine the temperature. The most commonly used equation for calibration and testing is the Steinhart-Hart Equation. Most suppliers can help you determine the correct numbers to complete the equations. This process can be complicated for those unfamiliar with these equations, so seek help from your manufacturer when needed.

Not testing and calibrating your devices could result in inaccurate readings or thermistors that don't work as intended.

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