Interruption of measured variable analyses in an automatic...

B - Operations – Transporting – 01 – J

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B01J 47/14 (2006.01) B01J 49/00 (2006.01) C02F 1/00 (2006.01) C02F 1/42 (2006.01) G05D 21/02 (2006.01)

Patent

CA 2734777

A method for operating a water softening system (1) comprising - an automatically adjustable blending means for mixing a blended water flow V(t)blended from a first, softened partial flow V(t)part1soft and a second untreated water partial flow V(t)part2raw and comprising - an electronic control means (11), wherein the control means (11) readjusts the adjustment position of the blending means by means of one or more experimentally determined instantaneous measured values in such a fashion that the water hardness in the blended water flow V(t)blended is adjusted to a predetermined desired value (SW), is characterized in that the control means (11) ignores at least one of the one or more instantaneous measured values for readjustment of the adjustment position of the blending means in one or more defined operating situations, and instead uses the respectively last corresponding measured value that was valid prior to occurrence of the defined operating situation, or a standard value for the corresponding measured value, which is stored in the electronic control means (11). The inventive method reduces the wear of the automatically adjustable blending means and improves the reliability of the adjustment of the water hardness of the blended water.

Linvention concerne un procédé pour lexploitation dune installation dadoucissement de leau (1) comprenant un dispositif de coupage pour mélanger un flux deau de coupage V(t)verschnitt provenant dun premier flux partiel V(t)teil1weich adouci et dun deuxième flux partiel V(t)teil2roh pour la circulation deau non traitée; et un dispositif de commande électronique (11) qui régule la position de réglage du dispositif de coupage au moyen dune ou plusieurs grandeurs de mesure momentanées déterminées expérimentalement de telle sorte que la dureté de leau soit réglée dans le flux deau de coupage V(t)verschnitt à une valeur de consigne (SW) prédéfinie. Ce procédé est caractérisé en ce que, dans un ou plusieurs états de fonctionnement définis, le dispositif de commande (11) ignore au moins une desdites grandeurs de mesure momentanées pour la régulation ultérieure de la position de réglage du dispositif de coupage et quil sappuie, au lieu de cela,  sur la dernière valeur de mesure correspondante valable avant lapplication de létat de fonctionnement défini, ou sur une valeur standard enregistrée pour cette grandeur de mesure dans le dispositif de commande électronique (11). Le procédé selon linvention peut diminuer lusure du dispositif de coupage à réglage automatique et améliorer la fiabilité du réglage de la dureté de leau coupée.

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