Continued from last article.
We are introducing liquid level measurement for NTC thermistor. In the water and air of the same temperature, and under the same electrical condition, a constant current is provided to NTC thermistor, and make the thermistor produce self-heat. The voltage of NTC thermistor is relatively stable after heat balance. Then put it into the water, the voltage of NTC thermistor rises. That’s because when NTC thermistor enters into the water, the temperature falls, resulting in a resistance increase and the terminal voltage increase. The heat capacity of water is 2.5 times higher than the air, so the self-heat temperature in the water needs 2.5 times power than that in the air.
Physical photo of a typical NTC thermistor
There are various types of NTC thermistor in Analog Technologies, Inc., such as
ATH10K1R25 and
ATH100K1R25, etc. These
NTC thermistors feature long term stability and high accuracy, with high quality.
To be continued…
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