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the alarm circuit for blocked fertilization tube of the seed

2017-01-06 23:23  
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the alarm circuit for blocked fertilization tube of the seeding-machine
When you plant the crops and fertilize them,the liquid fertilizer in the fertilization storage tank goes to the ditching tube through the metal tube 2 and the metal tube 4.Then it goes to the soil.When the tube is unclogged,there is no liquid fertilizer in the metal tube 1.If there is liquid fertilizer in the metal tube 2 and 4,B and C is connected by the resistence of the liquid fertilizer.V1 and V2 are conducted.V3 is stopped.There are no liquid fertilizer in the metal tube 1 .It is insulated between A and B.So it is open-circuit between A and B.V4 and Y4 are stopped.K is released.HL is not lighted.HA doesn't give a sound.