Tank water level detector. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Indicators, detectors
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The water level in a tank or other container can be measured in many different ways of greater or lesser complexity. The simplest diagram of the control device is shown in the figure.
As soon as the water level drops below the electrodes, the LED starts to glow. At a high water level, the FET conducts almost no current, because the gate is connected to ground and there is no potential difference between the gate and the source.
When the water level drops, the gate-source connection is lost. There is a positive potential at the gate through the resistor R2 and the field-effect transistor is in the open state. The LED lights up.
If you want the LED to glow when the electrodes are shorted by water, then you need to connect the "ground" electrode in the circuit to the positive and the resistor R2 between the gate and the source.
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