초록 ▼

A level control apparatus is disclosed for controlling a liquid level between a maximum and a minimum. An elastic circuit generates a reference pulse which receives the pulse and triggers the generation of first and second reference pulses. The first reference pulse has a width which corresponds to

A level control apparatus is disclosed for controlling a liquid level between a maximum and a minimum. An elastic circuit generates a reference pulse which receives the pulse and triggers the generation of first and second reference pulses. The first reference pulse has a width which corresponds to the function of the maximum level of liquid and the second reference pulse has a width which corresponds to the function of the minimum of liquid. A capacitance probe supplies an output to a level sensing means which generates an output control pulse which varies in time with respect to the liquid level. A response circuit receives the first and second reference pulses and the control pulse and generates a first response when the reference pulse and the control pulse occur at a time which indicates that the fluid is at the maximum level and a second response signals when the second response indicates that the fluid has dropped to a minimum level with a time provided between the minimum and maximum where no response is developed.

대표청구항 ▼

Apparatus for controlling a liquid level between a maximum and a minimum in a container means comprising: (a) clock means generating an output timing pulse; (b) reference pulse means receiving said timing pulse and triggering the generation of first and second reference pulses, said first reference

Apparatus for controlling a liquid level between a maximum and a minimum in a container means comprising: (a) clock means generating an output timing pulse; (b) reference pulse means receiving said timing pulse and triggering the generation of first and second reference pulses, said first reference pulse having a width corresponding to a function of the maximum level of said liquid and said second reference pulse having a width corresponding to a function of the minimum level of said liquid; (c) capacitive probe means disposed in said container means in contact with liquid level between a maximum and a minimum to provide a proportional capacitive signal output; (d) level sensing means triggered by said timing pulse to produce and output control pulse, and receiving said capacitive signal output to vary said control pulse width proportional to said liquid level; (e) first and second gate means each receiving respective first and second output pulses as well as respective control pulse inputs and generating a first response signal when said first reference pulse and said control pulse occur at a time indicating that said fluid is at said maximum level, and a second response signal when said second reference pulse and said control pulse occur at a time indicating that said fluid level has dropped to said minimum level; (f) means energizible to stop and to begin flow of fluid to said container means; and (g) means responsive to first and second response signals to control said means energizible to stop the flow of liquid when said maximum level has been reached and begin the flow of fluid when said minimum level has been reached.