Liquid dispensing apparatus and method by sensing the type of liquid vapors in the receiver

A liquid dispensing apparatus comprising

• a liquid supply line having an input and having an output end;
• a dispenser gun attached to the output end of the liquid supply line;
• a detecting element including a measuring means having an impedance change depending on a surrounding evaporated gas and attached to the dispenser gun for detecting the kind of liquid to be supplied from a gas evaporated from residual liquid surrounding a location which requires additional supply, said detecting element furnishing a sensor signal corresponding to the evaporated gas at an output;
• a discriminator connected to the detecting element for discriminating the sensor signal obtained from said detecting element and for generating an electronic lock signal depending on distinction based on the kind of gas derived from evaporated liquid surrounding the location;
• and
• a locking means having an electronic input connected electronically to the discriminator and actuated by said lock signal of the discriminator for interrupting dispensing of liquid depending on the lock signal furnished by the discriminator, wherein
• the discriminator is an electronic circuit which generates the electronic lock signal for controlling the operation of the locking means including
• a differentiating circuit having an input connected to an output of the detecting element;
• a comparator having a first input connected to an output of the differentiating circuit and having a second input;
• a set point value memory having an input and having an output connected to a second input of the comparator;
• a lock signal generator having an input connected to the comparator and having an output connected to an electronic input of the locking means.

A liquid dispensing apparatus comprising

• a liquid supply line having an input and having an output end;
• a dispenser gun attached to the output end of the liquid supply line;
• a detecting element including a measuring means having an impedance change depending on a surrounding evaporated gas and attached to the dispenser gun for detecting the kind of liquid to be supplied from a gas evaporated from residual liquid surrounding a location which requires additional supply, said detecting element furnishing a sensor signal corresponding to the evaporated gas;
• a discriminator connected to the detecting element for discriminating the sensor signal obtained from said detecting element and for generating a lock signal depending on distinction based on the kind of gas derived from evaporated liquid surrounding the location;
• and
• a locking means connected electronically to the discriminator and actuated by said lock signal of the discriminator for interrupting dispensing of liquid depending on the lock signal furnished by the discriminator, wherein
• the detecting element is formed by
• a first electrode,
• a second electrode,
• a gas-sensing member disposed between the first and the second electrode, said gas-sensing member is formed of resin material including a conductive substance, and which conductive substance changes its impedance upon being placed in contact with a vaporized gas of a liquid to be detected, wherein
• the detecting element is provided by a measuring means having an impedance change depending on the surrounding vaporized gas and wherein the discriminator is connected to and adapted to the measuring means for allowing to distinguish liquids to be detected based on their vapors,
• wherein the detecting element is an elongated structure disposed aligned with the direction of output wires of the detecting element;
• a socket disposed between the gas sensing member and ends of respective output wires for allowing a quick connection of the gas sensing member to the socket.