Method and system for measuring water hardness

Details Method and system for measuring water hardness Method and system for measuring water hardness

G - Physics

01

N

G01N 33/18 (2006.01) A47L 15/44 (2006.01) C02F 5/12 (2006.01)

Patent

CA 2602438

Prior to adding detergent or chelant, the conductivity of water in a washing chamber is measured. The maximum concentration of hard water ions that could correspond to the 5 measured conductivity is determined, i.e., it is assumed that all of the conductivity is from calcium and/or magnesium ions in the water even though other ions may in fact be contributing to the measured conductivity. Enough chelating agent is added to the chamber to sequester this maximum concentration of hard water ions and the conductivity is measured again. Using the two conductivity measurements, the actual concentration of hard water ions 0 is determined. A chelant factor based on the actual concentration of hard water ions is then used to determine the amount of chelant to be added for subsequent wash cycles to sequester all of the hard water ions.

Préalablement à l'apport d'un détergent ou d'un séquestrant, on mesure la conductivité de l'eau dans une chambre de lavage. On détermine la concentration maximum d'ions d'eau dure pouvant correspondre à la conductivité mesurée (5), à savoir, on part du principe que la totalité de la conductivité est basée sur les ions calcium et/ou magnésium de l'eau, même si d'autres ions peuvent en fait contribuer à cette mesure de conductivité. On ajoute suffisamment d'agents séquestrants dans la chambre afin de séquestrer cette concentration maximum d'ions d'eau dure et on mesure de nouveau la conductivité. On détermine, au moyen de ces deux mesures de conductivité, la concentration réelle d'ions d'eau dure (0). On utilise ensuite un facteur séquestrant basé sur la concentration réelle des ions d'eau dure afin de déterminer la quantité de séquestrant à ajouter pour des cycles de lavage ultérieurs, de manière à séquestrer la totalité des ions d'eau dure.

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