Liquid level automatic control circuit using solid state relay (fill-in type)
Source: InternetPublisher:拳制龙 Keywords: solid state relay electrode Updated: 2021/03/12
It uses PSSR type AC solid state relay A, which has a simple circuit and reliable operation. It belongs
to the filling type liquid level automatic control circuit . When the water level drops below electrode B, pins 2 and 4 of A are disconnected, pins 5 and 6 of A are
connected, relay KA and contactor KM are closed, and the water pump starts to fill the water tank; when the water level rises to electrode A ,
pins 2 and 4 of A are connected through the water resistor, pins 5 and 6 of A are disconnected, KA and KM are released, and the water pump stops filling.
In the figure, Ri, Cl and varistor R are all over-voltage protection components of solid-state relays .
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