Thyristor water level regulator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Home, household, hobby
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The device is designed to automatically maintain the water level within the specified limits. Such a regulator is very convenient for controlling an electric pump that pumps groundwater from basements and other underground spaces.
In the basement, in the deepest place, a metal tank is dug in and two level sensors are mounted in it: one is lowered almost to the bottom, the second is installed near the upper edge of the tank. The tank and sensors are connected to the electronic unit (see diagram).
The top of the tank is covered with a grate. Ground water, accumulating in the tank, after a while will reach the lower end of the sensor E1. At this moment, an opening voltage will appear on the control electrode of the trinistor VS1, it will open and relay K1 will operate. With contacts K1.1, it will connect a second sensor E1 in parallel with sensor E2. With contacts K1.2 (not shown in the diagram), the relay will turn on the pump motor, which will start pumping water from the tank.
After some time, the water level will drop below the E2 sensor and the opening voltage from the control electrode of the trinistor will be removed. After that, at the next moment of transition through the "zero" of the mains voltage, the trinistor will close, turning off the pump. This is followed by a slow accumulation of water to the level of E1 - and the cycle repeats.
The sensors are plates made of strip stainless steel 2 mm thick, mounted on a holder made of insulating material with a low degree of moisture absorption (ebonite, polyethylene, fluoroplastic, rubber, etc.). The tank is also desirable to be made of stainless steel.
Relay K1 - RES9, passport RS4.524.203 (or another for a suitable response voltage, preferably with more powerful contacts). Transformer T1 - any, with a power of 5 ... 8 W with a secondary winding voltage of 15 V.
The described regulator can be used for various purposes in the national economy, it is only important that the working fluid is electrically conductive.
Author: V.Zolotar, Donetsk
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