US Patent 7520283 Water level sensor and dishwasher having the same

A water level sensor and a dishwasher having the same are disclosed, in which water level is sensed for stable supply of washing water. The water level sensor includes a case including a first chamber formed therein, a first floater provided in the first chamber, ascending as water level ascends, and a first switch selectively pressurized by the first floater to avoid excessive supply of water.