Electronic engineering power electromagnetic valve closed water level controller

Electrical engineering power electromagnetic valve closed water production water level controller made of electromagnetic valve of the electronic engineering world admin time control circuit is composed of and music Ic circuit, used for conductive liquid level control; ,,,, for the four pole, when the drawdown to probe the leakage, IC foot is low potential ( < / VDD) , setting, J suction machine, electromagnetic valve electrical work, fill the container. At the same time, the IC is triggered, play music, told to water injection; When the water rose to probe, potential, water resistance between the feet higher than/VDD trigger the electricity at ordinary times, reset, feet turn a low level, J release, turn off the water electromagnetic valve power; Probe needle for insurance, when the water rose to probe for some reason, VT conduction, show low potential, to reset the mandatory, switch off the solenoid valve.