Water level detector and circuit for an electric humidifier

Details Water level detector and circuit for an electric humidifier Water level detector and circuit for an electric humidifier

1987-11-17

1989-04-11

Wayner, William E.

Gas and liquid contact apparatus

With liquid separations

On inlet

261DIG48, B01D 4700

Patent

active

048204536

ABSTRACT:
An electric humidifier includes a water level detector needle set in the water cistern. When the water level is normal the needle detector applies a positive bias to the base of a first transistor in a bias supply loop circuit, and the transistor conducts to supply bias current to an ultrasonic oscillation circuit, and to apply a positive bias to the base of a second transistor such that the ultrasonic oscillation circuit drives an ultrasonic transducer and the second transistor conducts supply current to a fan motor. An insufficient water level causes cutoff of the first and second transistors and thus also cutoff of the ultrasonic oscillation circuit and fan.

REFERENCES:
patent: 3989042 (1976-11-01), Mitsui et al.

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