Product Introduction:
JYB-714 Liquid Relay
A level relay is a relay that controls the liquid level. It is an electrical control device, which is an electrical appliance that makes a predetermined step change of the controlled quantity in the electrical output circuit when the change of the input quantity meets the specified requirements. It has an interactive relationship between the control system and the controlled system. Usually used in automated control circuits, it is actually an automatic switch that uses a small current to control the operation of a large current. Therefore, it plays the role of automatic regulation, safety protection and conversion circuit in the circuit.
A level relay is a relay that controls the liquid level. It's a relay with electrical wiring inside. Using the conductivity of the liquid. When the liquid level reaches a certain height, the relay will operate to cut off the power supply. When the liquid level is lower than a certain position, the power supply is turned on to make the pump work. To achieve automatic control.
Automatic control consists of sensors and control actuators. The sensor of the level controller is generally a wire. Use the conductivity of water. The conductivity of water is poor and the relay cannot be driven directly. So there's an electronic circuit that amplifies the current to push the relay to work. The relay is the actuator
Working principle:
When the water level of the water tank is too low (lower than the yellow line terminal), the first triode base is low, the triode is cut off, and the collector is high. The second triode base has enough current through, the triode drink and conduction, the relay (K) is electrically drawn, the normally open contact (2, 3 feet) is closed, the external contactor is electrically drawn, the water pump pumping water supply box. The water level of the water tank gradually rises, although it is higher than the yellow wire terminal, so the relay is in the suction state, the 6 and 7 pins are switched on and the 6 and 5 pins are disconnected, and the first triode continues to be in the cut-off state.
When the water level rises to the pink wire terminal, the yellow and pink wire terminals pass the current through the water resistance to the first triode base, the triode saturated conduction, the collector is low level, the second triode base no current through and off, the collector is high level, the relay power loss reset cut off the contactor power supply, the water pump stops. Repeat this operation only when the water level drops below the yellow wire terminal.
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