Method for detecting impermissibly high scaling in a water-condu

Details Method for detecting impermissibly high scaling in a water-condu Method for detecting impermissibly high scaling in a water-condu

1998-05-26

2000-03-14

Stinson, Frankie L.

Bleaching and dyeing; fluid treatment and chemical modification

Fluid treatment

Manipulation of liquid

68 1202, D06F 3302

Patent

active

060354712

ABSTRACT:
Impermissibly high scaling is ascertained of an optical measurement section in which the turbidity of a washing liquid is detected in a domestic appliance that is operated with hard water, such as a washing machine or dishwasher. The appliance has an evaluation circuit for the measured signals from the measurement section and a microprocessor for binding the measurement results into the sequence control system of the appliance. The system is suitable for indicating impermissibly high scaling and for taking into account attenuation of the measurement section by chalk deposits during the determination of the turbidity of the washing liquid. Before or during the initial commissioning of the appliance, a threshold value for the permissible attenuation of the measurement section by future chalk deposits is stored, during each working cycle of the appliance, the attenuation of the measurement section is measured during a cycle section which is carried out without clouded washing liquid, whereby the attenuation is transformed into a measured value and compared with the threshold value, and the microprocessor outputs a control signal for the sequence control system when the measured value has reached or approximately reached the threshold value.

REFERENCES:
patent: 5048139 (1991-09-01), Matsumi et al.
patent: 5134867 (1992-08-01), Kiuchi
patent: 5438507 (1995-08-01), Kim et al.
patent: 5589935 (1996-12-01), Biard
patent: 5800628 (1998-09-01), Erickson et al.

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