Patent ID: 7938909
Filing Date: 2011-05-10
Classification: C02F

Abstract:
1. An automated method for determining the sanitisation cycle of a water treatment or water distribution apparatus or system containing water purification equipment, to which one or more substances are added and later removed, the automated method comprising the steps of: (a) initiating a sanitisation mode; (b) adding a substance to water in the apparatus during the sanitization mode and circulating a mixture of water and substance through a circulation loop in the apparatus or system; (c) conducting one or more measurements of the conductivity of the substance during the sanitization mode utilizing a first sensor mounted within the circulation loop; (d) comparing the conductivity measurement(s) from step (c) with at least one reference value for that property; (e) determining when the comparison in step (d) is within, above or below a pre-determined range or level for the conductivity; (f) initiating an action depending on whether the determination in step (e) is within, above or below a pre-determined range or level for the conductivity; (g) adding water to and removing water from the apparatus or system to reduce the amount of substance in the water within the apparatus or system; (i) sensing the conductivity of a feed water stream from outside the circulation loop using a second sensor mounted outside the circulation loop; and (j) returning the apparatus or system to use after the amount of substance in the water has been reduced below or value based on a comparison of the sensed conductivities from the first and second sensors.