Abstract: The invention relates to a liquid dispensing apparatus which includes a detecting element for detecting the liquid from the vaporized gas surrounding the remaining liquid in a storage tank to be supplied, where the detecting element is disposed at the output end of a liquid supply line, and a discriminator for discriminating the signals and information obtained from such a detecting element. The discriminator generates a lock signal to be fed to a locking means for allowing suspension of the supply of liquid based on a signal generated in the discriminator and fed to the locking means. The detection element includes a first electrode, a second electrode, a gas-sensing member connected to the first electrode and connected to the second electrode, which gas-sensing member is formed of a resin material including a conducting material which furnishes an impedance change upon contacting the vaporized gas of the liquid to be detected.

Abstract: An attachment ring assembly is provided for installation in drain openings. The assembly includes a cylindrical ring body installed in the drain opening, the ring body extending over the entire circumference of the discharge port of the drain opening, the ring body having a relatively small liquid-collecting opening in the lower end of the cylindrical ring. A liquid leak detecting sensor is installed in the liquid-collecting opening. A liquid leak which flows into the drain is dammed by the attachment ring assembly and channelled to flow into the liquid-collecting opening and to the sensor, thereby substantially reducing the time which would otherwise be required to detect the leak.

Abstract: An attachment bracket for attaching a liquid leakage sensor to a drain opening is provided. The attachment bracket has a funnel-shaped bracket body whose outer circumference is fitted in a liquid-tight relation inside the upper portion of the drain opening, this upper, tapered funnel portion being inclined downwardly toward a central opening leading to the drain. A generally circularly-cylindrical, "C"-shaped wall member of a prescribed height is installed on the upper funnel surface of the bracket body and extends around the circumference of the central opening of the bracket body except in the region of the opening of the "C" of the wall member, and a leak detecting sensor is attached to the bracket body within the opening of the "C" of the wall member. In use, a leak that enters the drain is blocked by the wall member and channelled by the wall member around to the opening of the "C", thereby concentrating the leak to the region of the sensor location more rapidly than would otherwise occur.