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Water tower automatic water supply protection circuit

2015-03-03 03:23  
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Water tower automatic water supply protection circuit
VT1, VT2, VT3, J1 are the main components of the pumping circuit, the working principle is not difficult to make a self- analysis for reader. Water protection circuit is mainly composed of the probe D and VT4, if the pumping time interval is too long, the tube memory water leakage is below D, and the water circuits A , D are open, VT4 gets saturated conduction, so that VT1 base pole clamp is at low potential. When the towers level falls to the lower limit B or less, due to the extremely low level of VT1 base, it can not be turned and therefore can not pumping.