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Liquid Level Relay
Relay is an electrical control device. When the change of input quantity (excitation quantity) reaches the specified requirements, it is an electrical appliance that makes the controlled quantity change in a predetermined step in the electrical output circuit. It has the interaction between the control system (also called the input loop) and the controlled system (also called the output loop). Usually used in automatic control circuit, it is actually an "automatic switch" that uses small current to control large current operation. Therefore, it plays the role of automatic adjustment, safety protection and conversion circuit in the circuit.