Pump control circuit. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Clocks, timers, relays, load switches
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This device can be useful in a country house or a farm, as well as in many other cases when it is necessary to control and maintain a certain level of water in the tank.
So, when using a submersible pump to pump water from a well for irrigation, it is necessary to ensure that the water level does not drop below the position of the pump. Otherwise, the pump, idling (without water), will overheat and fail.
The scheme of the universal automatic device (Fig. 1) will help you get rid of all these problems. It is simple and reliable, and also provides for the possibility of multifunctional use (water lifting or drainage).
The circuit circuits are not connected in any way with the tank body, which excludes electrochemical corrosion of the tank surface, unlike many previously published circuits of a similar purpose.
The principle of operation of the circuit is based on the use of electrical conductivity of water, which, falling between the plates of the sensors, closes the base current circuit of the transistor VT1. In this case, relay K1 is activated and with its contacts K1.1 turns on or off (depending on position 82) the pump.
As sensors F1, F2, you can use plates made of any metal that is not subject to corrosion in water. So, for example, you can use a used stainless razor (Fig. 2).
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