Measuring and testing – Liquid level or depth gauge – Hydrostatic pressure type
Patent
1979-02-21
1980-07-22
Goldberg, Gerald
Measuring and testing
Liquid level or depth gauge
Hydrostatic pressure type
116227, G01F 2316
Patent
active
042133386
ABSTRACT:
An indicator providing a visual indication of the level within a rinse aid dispenser tank for dishwashers, consisting of a U-tube containing an indicator liquid having one leg in communication with the lowermost region of the tank and with the other disposed adjacent a viewing window. Air pressure generated in the connecting tubing by the relative liquid level in the tank acts to control the position of the liquid in the U-tube to provide a level indication at the viewing window. The air column intermediate the tank and the U-tube section is vented each time the door is opened to avoid variations in indication occurring with temperature and atmospheric pressure changes. The indicator liquid is introduced through a fill and drain tube extending from the upper end of the leg into the dispenser tank, such that a calibrated volume of liquid is introduced by flow into the U-tube from the tank and drain back of the excess over the calibrated volume. An anti-siphon tube in communication with the fill and drain tube precludes siphoning of the rinse aid liquid back into the tank as the excess liquid drains back through the fill and drain tube upon closing of the dishwasher door.
REFERENCES:
patent: 2121743 (1938-06-01), Oyen
patent: 3127902 (1964-04-01), Cumming
patent: 3152723 (1964-10-01), Perl
patent: 3272011 (1966-09-01), Kendt
patent: 3371535 (1968-03-01), Martiniak
patent: 3608514 (1971-09-01), Dunn
Corr Denis E.
General Electric Company
Goldberg Gerald
Reams Radford M.
Yungman Bruce A.
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