My sensor reads accurately at room temperature but reads incorrectly at other temperatures. What is wrong?
Check the Characteristic Curve and Tolerance. The Characteristic Curve is the temperature/resistance curve that is established by the manufacturing process. This curve is the one most often used to describe the basic sensor characteristic. It does not describe the performance of the sensor. A major manufacturer of high accuracy thermistors catalogs four different sensors with the same characteristic curve. Each sensor becomes progressively more expensive as the sensor performance improves. To even be considered as an equal, a competing thermistor must have an identical curve. Any deviations in the curve indicate a questionable material mix and manufacturing process. Tolerance is the ability of the thermistor to adhere to its characteristic curve. It is tolerance that begins to separate high quality thermistors from general purpose sensors. Good tolerance characteristics of a thermistor can be obtained in several ways. PreCon obtains tight tolerance by excellence in the manufacturing pr
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