초록 ▼

An apparatus for measuring the quantity of a liquid such as a fuel in a tank, which comprises liquid level measuring electrodes, comparing electrodes dipped always in the liquid to detect the capacitance inherent to the liquid, an LC oscillator for converting each capacitive value measured by the el

An apparatus for measuring the quantity of a liquid such as a fuel in a tank, which comprises liquid level measuring electrodes, comparing electrodes dipped always in the liquid to detect the capacitance inherent to the liquid, an LC oscillator for converting each capacitive value measured by the electrodes into a corresponding frequency signal, reference electrodes constituting a level feeder together with the oscillator to compensate for capacitive variation of the latter, and a microcomputer for calculating a liquid quantity in the tank based on the frequency signals and for displaying the calculated quantity.

대표청구항 ▼

An apparatus for measuring the quantity of liquid in at least one tank, which comprises means for detecting a liquid level in the tank and having positive and negative electrodes arranged to allow a flow-in and out of the liquid therebetween for generating a capacitive value, capacitive means arrang

An apparatus for measuring the quantity of liquid in at least one tank, which comprises means for detecting a liquid level in the tank and having positive and negative electrodes arranged to allow a flow-in and out of the liquid therebetween for generating a capacitive value, capacitive means arranged below said liquid level detecting means and dipped always in the liquid to measure a dielectric constant of the liquid, a capacitive reference means that is not responsive to the dielectric constant of the liquid, a LC oscillator means converting each capacitive value measured by said liquid level detecting means, liquid dielectric constant measuring means and reference means into a frequency signal, said reference means compensating a capacitive variation of said LC oscillator means due to ambient temperature change and aging thereof, said LC oscillator means being connected to each of said liquid level detecting means, liquid dielectric constant measuring means and reference means through a switching means, and a control box with an indicator means to calculate the quantity of liquid in the tank based on the frequency information from said LC oscillator means and indicate the same on the indicator means.