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Automatic maintenance of the water level in the tank

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Automatic maintenance of the water level in the tank
Pump control circuit with galvanic isolation of input and output
Purchased water level sensors are used. Automatically supports
set water level. Collected and used in the country.
Work description.
If the water level is below both sensors, on the 11th output of the DD1.4 chip will appear
logical unit and triac VS2 will turn on the pump. With a gradual rise in the water level
even if the water contacts the lower sensor, it will still be
logical unit. As soon as the water level reaches the upper sensor at pin 11
microcircuit DD1.4 a logical zero appears, the VS2 triac will turn off the pump and water in
the container will not flow. When the water level drops and the upper sensor will not
come into contact with water, then on the 11th output of the DD1.4 microcircuit there will still be a logical zero
and the pump will not turn on. But if the water level drops below the lower sensor, then by
11 output of the DD1.4 chip will appear and the pump will turn on. Pump power no more than 2 kW.
The triac is installed on the radiator. The radiator area depends on the pump power.
Printed circuit boards (power and control)
The power board and the triac are installed on the heatsink


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