Continued from last article.
In actual liquid level measurement, the temperatures of the water and air are often not the same. When the air temperature is low and the water temperature is high, we can’t judge
NTC thermistor is in the water or air according to the voltage. However, if we know a temperature point and also the voltages of the air and the water at this temperature, then we can judge the NTC thermistor is in the air or in the water. That is to say, the liquid level and the temperature need to be measured at the same time, but generally, it’s hard to measure temperature when
NTC thermistors are self-thermal. Therefore, another NTC thermistor is needed. By using two NTC thermistor, one in self-thermal, and the other not. Then we can measure the liquid level after processing in electronic circuit. Likely, the liquid level measurement in other gas or liquid media can be solved.
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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