EP 0985144 A1 20000315 - METHOD FOR DETECTING AN UNACCEPTABLY HIGH DEGREE OF CALCIFICATION IN A WATER-CARRYING HOUSEHOLD APPLIANCE
Title (en)
METHOD FOR DETECTING AN UNACCEPTABLY HIGH DEGREE OF CALCIFICATION IN A WATER-CARRYING HOUSEHOLD APPLIANCE
Title (de)
VERFAHREN ZUM FESTSTELLEN EINES UNZULÄSSIG HOHEN VERKALKUNGSGRADES IN EINEM WASSERFÜHRENDEN HAUSHALTSGERÄT
Title (fr)
PROCEDE POUR DETECTER UN DEGRE D'ENTARTRAGE INACCEPTABLE DANS UN APPAREIL MENAGER VEHICULANT DE L'EAU
Publication
Application
Priority
- DE 19721976 A 19970526
- EP 9802924 W 19980518
Abstract (en)
[origin: DE19721976A1] The invention relates to a method for detecting an unacceptably high degree of scale in an optical measuring section for measuring the turbidity of a lye in a household appliance which operates using calcareous water, such as a washing machine or a dishwasher. The household appliance has a circuit for evaluating the measuring signals from the measuring section (1) and a microprocessor (5) for transferring the measuring results to the sequential control of the appliance. This method is suitable for indicating an unacceptable degree of scale and for taking into account a deterioration of the measuring section due to scaling when determining the turbidity of the lye. Before or during first use of the appliance, a threshold value for acceptable deterioration of the measuring section by future scaling is memorized. During each operating cycle of the appliance, the deterioration of the measuring section during a cycle section which is carried out without turbid lye is measured and converted into a measured value, which is then compared to the threshold value. The microprocessor emits a control signal to the sequential control when the measured value reaches, or nearly reaches, the threshold value.
IPC 1-7
IPC 8 full level
A47L 15/42 (2006.01); D06F 34/22 (2020.01); D06F 39/00 (2006.01); G01N 21/53 (2006.01)
CPC (source: EP KR US)
A47L 15/4297 (2013.01 - EP US); D06F 34/22 (2020.02 - EP US); G01N 21/53 (2013.01 - KR); G01N 21/534 (2013.01 - EP US); D06F 2103/20 (2020.02 - EP US); D06F 2105/52 (2020.02 - EP US); D06F 2105/58 (2020.02 - EP US)
Citation (search report)
See references of WO 9854564A1
Designated contracting state (EPC)
AT CH DE ES FR GB IT LI
DOCDB simple family (publication)
DE 19721976 A1 19981203; DE 19721976 B4 20080724; BR 9809174 A 20000801; CN 1257579 A 20000621; EP 0985144 A1 20000315; KR 20010012922 A 20010226; PL 336936 A1 20000717; TR 199902770 T2 20000221; US 6035471 A 20000314; WO 9854564 A1 19981203
DOCDB simple family (application)
DE 19721976 A 19970526; BR 9809174 A 19980518; CN 98805460 A 19980518; EP 9802924 W 19980518; EP 98930702 A 19980518; KR 19997010890 A 19991124; PL 33693698 A 19980518; TR 9902770 T 19980518; US 8471498 A 19980526