Method and device for determining the amount of a liquid existing in a container

A device for determining an amount of a liquid existing in a container, comprising:

• a resonance circuit integrally formed on at least one side of the container and including a first coil, a second coil and a plurality of electrodes;
• a drive coil provided outside of the container and positioned to induce a voltage having a preselected frequency in said first coil;
• a sense coil provided outside of the container and positioned to induce a voltage from said second coil;
• a measuring device configured to measure the voltage induced in said sense coil;
• and
• a controller configured to compare the voltage measured by said measuring device with a preselected voltage value and determine an amount of a liquid in the container.

A device for determining an amount of a liquid existing in a container, comprising:

• probing means for electrically probing the amount of the liquid, said probing means being integrally formed on at least one side of the container and including a first coil and second coil;
• a drive coil provided outside of the container and positioned to induce a voltage having a preselected frequency in said first coil;
• and
• a sense coil provided outside of the container and positioned to induce a voltage from said second coil;
• measuring means for measuring the voltage induced in said sense coil;
• and
• determining means for determining an amount of a liquid in the container by comparing the voltage measured by said measuring device with a preselected voltage value.