Patent ID: 9282875
Filing Date: 2016-03-15
CPC Classification: A47L,G01F,Y10T

Claim Text:
1. An alarm system for monitoring a level of a sanitation agent in a dishwasher, the dishwasher having a sanitation agent supply vessel associated with a supply tube, the supply tube having a first portion adjacent the supply vessel and a second portion, the alarm system comprising: a hollow pipe configured for receiving the sanitation agent from the supply tube first portion and conveying the sanitation agent to the supply tube second portion; an optical sensor configured for sequentially taking a reference reading, a first reading, and a second reading; the first and the second readings being averaged to compute a fault check reading; a first output device; and a controller in electronic communication with the optical sensor and the first output device; wherein the controller causes the first output device to output a warning signal upon detecting an air bubble in the pipe when a magnitude of the difference between the reference reading and the fault check reading exceeds a threshold.