Selecting Optimal Temperature Sensors

Optimizing temperature detection circuits can best be achieved by carefully determining and selecting the best temperature sensor for your application. This allows users to minimize cost without sacrificing performance, reliability, and accuracy. Several key factors should be considered to find the right thermistors for your specific application.

The first and foremost point to consider is the temperature range. When purchasing a thermistor, the lower and upper temperature requirements need to be established. Choosing the wrong range or too wide of a range can cost your business time and money.

The packaging or housing for a thermistor is also important. Lower-cost sensors are sometimes coated in epoxy. Higher temperature applications may require the sensor to be hermetically sealed in glass. For those who need a robust housing, stainless steel tubing is an option. The more complex the housing becomes, the higher the price of the final sensor assembly.

Stability of the sensor needs to be considered, based on the requirements of the application. Over time, a sensor can drift (depending on the materials, packaging, and construction). Long term repetitive applications over a period of years, will require a more stable sensor than applications that are only expected to have a short life cycle.

Choosing thermistors that meet your application's specific needs will help insure proper temperature detection while keeping the cost to a minimum.

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