Water detector. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Measuring technology
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The diagram shown is a simple water indicator.
Most often, the circuit is used to signal the state of the water level in various structures. The sensor of the device is the "resistance" R3 according to the scheme - it is an ordinary electrical conductor. To maintain the reliability of the device, a silver or silver-plated plate is used as an electrode.
The connection of the plate with the wire is provided mechanically (chrome-plated fasteners). If the sensor is located at a considerable distance from the device (several tens of meters), it is necessary to take care of the appropriate wire section and the reliability of the grounding of the device and the water structure. (As an option, it is possible to make a sensor with two electrodes and not ground the structure).
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