Calcine scale indicator for coffee machines - has detection circuit comprising temp, dependent resistor, indicator lamp and ballast resistor

The detection of scale depends on a heat detection circuit placed at some appropriate point in the coffee percolator etc. A cold water reservoir containing the correct amount of water, is slowly emptied through an electric heater which boils the water through a filter containing coffee into a suitab...

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Bibliographic Details
Main Author LINDSTAEDT,BERND
Format Patent
LanguageEnglish
German
Published 26.08.1976
Subjects
APPARATUS FOR MAKING BEVERAGES
COFFEE MILLS
DOMESTIC ARTICLES OR APPLIANCES
ELECTRIC HEATING
ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
FURNITURE
HUMAN NECESSITIES
KITCHEN EQUIPMENT
MEASURING
MEASURING QUANTITY OF HEAT
MEASURING TEMPERATURE
PHYSICS
SPICE MILLS
SUCTION CLEANERS IN GENERAL
TESTING
THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
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Summary:The detection of scale depends on a heat detection circuit placed at some appropriate point in the coffee percolator etc. A cold water reservoir containing the correct amount of water, is slowly emptied through an electric heater which boils the water through a filter containing coffee into a suitable vessel mounted on a hot plate. When the sequence is completed and all the water used, the rise in temperature of the water heater element is used to open a switch by means of a bimetallic detector and thus interrupt the electric circuit. Across the switch and inside the reservoir is connected the scale detection circuit consisting of a temperature dependent resistor indicator lamp and a ballast resistor.
Bibliography:Application Number: DE19752505789