NTC thermistor plays a vital role in many applications, due to its characteristics: the resistance decreases with the increase of the temperature and the resistance increases when the temperature falls. There are some application examples of NTC thermistor.
1. NTC thermistor in body temperature probe
The temperature accuracy of body temperature probe can reach 0.1°C. Therefore, the requirements on the thermistor is compact size, high accuracy, high reliability, good thermal cycle resistance capability. Clinical monitor applies double track body temperature measurement circuit, which is used for monitoring critically ill patients. It requires that one body temperature probe provides double track temperature measurement, which can match the double track temperature measurement circuit in the monitor. Traditionally, put two NTC thermistors in parallel to form a body temperature probe. Since this kind of probe has a large size, which cannot meet the requirements of miniaturization. On the one hand, two thermistors make the measurement result more accurate, for the reason that we can compare the results of two chips, and we can get a more accurate actual temperature. On the other hand, it has higher reliability. When accidentally one chip has sudden failure, the other chip can work well.
To be continued…
Physical photo of NTC thermistor
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