| US 7,556,738 B2 | ||
| Method for determining the duration of a brine/slow rinse cycle for a water conditioner | ||
| Kumudika Premathilake, Rolling Meadows, Ill. (US); and John VanNewenhizen, Mundelein, Ill. (US) | ||
| Assigned to Culligan International Company, Rosemont, Ill. (US) | ||
| Filed on May 26, 2005, as Appl. No. 11/138,179. | ||
| Prior Publication US 2006/0266710 A1, Nov. 30, 2006 | ||
| Int. Cl. C02F 1/42 (2006.01) | ||
| U.S. Cl. 210—662 [210/670; 210/746] | 10 Claims |
| 1. A method for determining the duration of a brine/slow rinse cycle in a process cycle for a water conditioner having a bed
of ion-exchange material, comprising:
positioning a sensor probe and a reference probe in the bed of ion-exchange material vertically displaced from each other,
with the sensor probe upstream of the reference probe;
monitoring a voltage from each of the sensor probe and the reference probe over a plurality of time intervals;
calculating a rate of change in the impedance ratio of the sensor probe to the reference probe;
detecting a first peak in a rate of change between time intervals of impedance ratios of the sensor probe to the reference
probe;
repeating said monitoring, calculating and detecting steps until a second peak is detected; and
terminating the brine/slow rinse cycle after both peaks have been detected.
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