Circuit for detecting calcification in a coffee maker

Details Circuit for detecting calcification in a coffee maker Circuit for detecting calcification in a coffee maker

1992-11-05

1994-11-29

Peng, John K.

Communications: electrical

Condition responsive indicating system

Specific condition

340607, 340608, 99285, G08B 2100

Patent

active

053693981

ABSTRACT:
The system described in the specification detects and visually indicates the presence of significant calcification in a conduit made of clear (i.e., light-transmitting) material. The present invention directly determines calcification and indicates cleaning of the clear water conduit. An infrared transmitting circuit emits an infrared pulse through the clear conduit. As long as calcification has not formed on the conduit to block the infrared pulse, a phototransistor or infrared receiving circuit receives the infrared pulse. When calcification has formed to a degree sufficient to block the emitted infrared pulse, the receiving circuit determines that calcification has occurred and provides a visual indication to a user that the conduit needs cleaning.

REFERENCES:
patent: 4122763 (1978-10-01), Waninger et al.
patent: 4139761 (1979-02-01), Obrowski
patent: 4141286 (1979-02-01), Smit
patent: 4214148 (1980-07-01), Fleischhauer
patent: 4292499 (1981-09-01), Kleinschmidt et al.
patent: 4827837 (1989-05-01), Johnson et al.
patent: 4872402 (1989-10-01), Johnson et al.

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