| 摘要 |
PURPOSE:To make it possible to cut off power supply to an oscillation circuit driving a vibrator and to prevent an electrode of the vibrator in contact with water being corroded in water and damaged by detecting the water by a water level detection circuit when the voltage of the detection electrode becomes below a difined value. CONSTITUTION:A detection voltage corresponding to a current flowing to a detection electrode 20 from an auxiliary electrode 19 in accordance with a level of water 9 by an detection electrode 20 provided at a water level detecting position of the water 9 within an atomizing tank 4 is inputted into a water level detection circuit 13, where by, when the voltage of the detection electrode 20 has reached a defined value, it is detected that the water level has been lowered, and the power supply to an oscilla tion circuit 8 is interrupted by the relay 15 of the water level detection circuit 13, and when the water level is restored, the power supply is again applied. When a power supply switch 12 is turned off, a current from a battery 6 is completely inter rupted because a normally open contact 16 is opened and a current to the detection electrode 20 from the auxiliary electrode 19 of the atomizing electrode 19 is also cut off. Therefore, the galvanic corrosion of the auxiliary electrode 19 is produced only when the power supply switch 12 is turned on, and the corrosion of the electrode 19 is reduced.
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