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Advantages and Disadvantages of NTC thermistors Applied to Medical Temperature Probe
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Advantages and Disadvantages of NTC thermistors Applied to Medical Temperature Probe
2018-05-22
Advantages and Disadvantages of NTC thermistors Applied to Medical Temperature Probe


NTC thermistors Applied to Medical Temperature Probe

Advantages: 

Exsense NTC thermistor has high accuracy, high reliability, small volume, good heat resistance and good performance.

The characteristics of its wide measuring range, high precision measurement is widely used in anesthesia surgery that which need long time trend of temperature monitoring, and therefore is widely used in making the medical temperature probe which can adaptation to monitor.

Now domestic commonly used NTC thermistor temperature sensor specifications have Ω R25 = 2.252 K, R25 = 10 K Ω B25/50 = 3935 K, etc.


Disadvantages: 

The applicability is not high enough.

NTC thermistor in terms of real-time temperature measuring, due to thermal resistor thermal balance response time is slow when the temperature response time is too long, limit the scope of its application in temperature measurement, such as rapid temperature measurement of outpatients, inpatient conventional temperature measurement.

The resistance with the temperature change is not linear, R - T curve is discrete, it cannot ensure the wide temperature range (such as - 20 ℃ ~ 125 ℃) to assure the consistency between value error.


Therefore, it is necessary to determine the center temperature working point when selecting NTC thermistor.

Generally, the resistance error and design error of temperature section near the working temperature point of the center are minimal.


Such as: the fridge with NTC thermistor usually choose 0 ℃ adjustable resistance as center working temperature points, then in - 10 ℃ ~ + 10 ℃ of the temperature resistance error and the most close to 0 ℃.

So the farther from 0 ℃ temperature point, resistance error will change accordingly.


                                                                           

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