Liquid purification or separation – Processes – Ion exchange or selective sorption
Patent
1994-06-06
1996-01-02
Drodge, Joseph W.
Liquid purification or separation
Processes
Ion exchange or selective sorption
210 961, 210140, 210190, 210746, 324443, C02F 142
Patent
active
054805554
ABSTRACT:
A control system for a water softener, control device therefor and methods of making the same are provided, the system comprising a microcontroller operatively interconnected to an output of a comparator to effect a subsequent operation of a recycling unit for the water softener when the output signal is at a certain condition thereof, the system causing the output signal to have a phase shift relative to the phase of an A.C. power supply of the system when a sensing electrode unit in the ion exchange bed of the water softener is at a certain resistance value relative to the resistance value of a reference electrode unit that is also disposed in the ion exchange bed, the phase shift comprising the certain condition of the output signal, the microcontroller determining the certain condition by comparing the phase of the output signal to the certain phase.
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Drodge Joseph W.
Robertshaw Controls Company
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