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How does water sensor work (in ultrasonic transducers)

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But as you can see in these pictures there is resistor between sensor and case!

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13567811651.jpg
 
There's no apparent reason why resistance shouldn't be present. If I were trying to measure a change in capacitance (assuming the sensor is a capacitive type) one option would be to use an RC-oscillator and sense a frequency shift.
 
No; but even if I did the site upload function doesn't work for me.
 
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