WATER LEVEL DETECTING CONTROL & OVER LOAD SAFETY CONTROL DEVICE

摘要

The water level sensing control and overvoltage safety control device includes a falling thunderbolt surge absorber(10) for absorbing AC 200V of normal mode surge voltage by means of a varistor((Z471) and a common mode surge voltage by means of varistors(Z681,Z182), to thereby earth the absorbed voltage to the ground; a pipe water level sensor(20) for sensing the water level by flowing a normal frequency voltage AC 12V current 1Ma-10Ma on the both sides of a water level sensing bar; a strong and weak voltage separator(30) for separating strong and weak voltages by means of a relay(RY-1) to minimize failure causes due to the falling thunderbolt surge; and a water controller(40) for driving the relay(RY-1) of the strong and weak voltage separator(30).