Water level indicator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Home, household, hobby
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The scheme of the water level indicator is shown in Fig. 1
Ris.1
When the water in the tank rises to a predetermined level, determined by the position of the electrode E, located in the tank and isolated from its walls, the transistor T1 opens, the switch lamp L1 (KM-2; 12V, 105 mA) lights up. When the water level drops, the lamp will go out, since the base circuit of the transistor will be open.
Electrode E is a metal rod, preferably poorly oxidized.
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