Method and device for detecting the quantity of a product...

G - Physics – 01 – N

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G01N 27/10 (2006.01) G05D 7/00 (2006.01)

Patent

CA 2349380

The invention relates to a method for detecting the quantity of a product (P), preferably in paste or powder form, dissolved in a solution flow of known flow rate and unknown and/or variable concentration. Said universal method, which can be used with different con-trol and evaluation units, is character-ized by the following steps: a) cyclic measurement of the solution's (L) con-ductance; b) determination of the con-centration of the solution (L) by com-parison of the conductance measured with conductance/concentration charac-teristic curves (4a) stored in a data memory; c) calculation of the quantity of product from the product concen-tration determined in this way and the known flow rate; and d) addition of the calculated product quantity and generation of a pulse (7) as soon as a settable product quantity is reached. The invention also relates to a device for carrying out the above method.

L'invention concerne un procédé de détection de la quantité d'un produit (P), de préférence en pâte ou en poudre, dissous dans un courant de solution, de débit connu et de concentration inconnue et/ou variable. Un procédé d'emploi universel, impliquant un raccordement à des unités de commande et d'évaluation est caractérisé en ce qu'il comprend les étapes ci-après: a) mesure cyclique de la conductibilité de la solution (L); b) détermination de la concentration de la solution (L) par égalisation de la conductibilité mesurée avec des caractéristiques conductibilité/concentration (4a) mémorisées dans une mémoire de données; c) calcul de la quantité de produit à partir de la concentration déterminée en produit et du débit connu, et d) somme des quantités de produit calculées, et production d'une impulsion (7) dès qu'une quantité de produit réglable est atteinte. L'invention concerne en outre un dispositif pour la mise en oeuvre de ce procédé.

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