Maintaining Consistent Performance during Thaw and Freeze Applications

Thermistors, when compared to similar sensing devices, are ideal for application that have operating temperatures that range from -55˚C to +125˚C. A Thermistor probe is frequently used in refrigeration applications (temperatures ranging from -40˚C to +120˚C). Sensors are mounted to evaporator coils, to discharge lines, and inside of cabinets (other locations as well). Although a thermistor probe is ideal for these temperatures, operation can be harsh, which can potentially lead to premature failure. A failure usually requires costly repairs and a loss of time and products. Thermistor

Harsh operating environments exist to maximize the cooling efficiency. It is also frequently used to minimize energy usage and to automatically defrost. Inside of a refrigeration system, evaporator coils are heated so that the temperature of the coils raise from ~-40˚C to +100˚C, which is needed to remove frost from the fins and coils. Ensuring that frost is thawed and removed will allow for more efficient cooling. Another important factor for reliability in thaw and freeze applications include the materials used, such as housing, encapsulation compounds, and extension cables. Lastly, sealing methods and materials must be used to keep moister from reaching the thermistor element.

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