초록 ▼

An electronic liquid level gauge for measuring the level of a liquid contained in a vessel by employing an electrode pair immersed in the liquid. The electrode pair is associated with an oscillator which generates pulses of a repetition period directly proportional to the electrostatic capacity of t

An electronic liquid level gauge for measuring the level of a liquid contained in a vessel by employing an electrode pair immersed in the liquid. The electrode pair is associated with an oscillator which generates pulses of a repetition period directly proportional to the electrostatic capacity of the electrode pair. A counter is provided which is reset by an oscillator pulse and starts counting reference pulses of a predetermined repetition rate with a predetermined time delay relative to the occurrence of the oscillator pulse.

대표청구항 ▼

An apparatus for measuring the level of a liquid contained in a vessel, said liquid having a specific inductive capacity, comprising: (a) a first electrode having an electrostatic capacity determined by the liquid level, said first electrode being connected to a first oscillator for generating first

An apparatus for measuring the level of a liquid contained in a vessel, said liquid having a specific inductive capacity, comprising: (a) a first electrode having an electrostatic capacity determined by the liquid level, said first electrode being connected to a first oscillator for generating first oscillator pulses at a repetition period directly proportional to the electrostatic capacity of said first electrode; (b) a second electrode having an electrostatic capacity determined by the specific inductive capacity of said liquid, said first electrode being connected to a second oscillator for generating second oscillator pulses at a repetition period directly proportional to the electrostatic capacity of said second electrode; (c) a counter for counting said second oscillator pulses from said second oscillator; (d) a control circuit for generating a control signal to reset and at the same time start said counter counting second oscillator pulses each time a predetermined number of first oscillator pulses occurs; (e) a first gate circuit for disconnecting said second oscillator from said counter for a predetermined time each time a predetermined number of first oscillator pulses occurs; and (f) a second gate circuit for disconnecting said first oscillator from said control circuit for a predetermined time each time a predetermined number of second oscillator pulses occurs, thereby permitting said counter to accumulate a count equal to the liquid level for a time interval between successive control signals.