SERVICE INITIATION AND REGENERATION CONTROL USING IMPEDANCE RATIOS

An apparatus and method for determining the end of a service step and the duration of a brine/slow rinse step in a water conditioner having a bed of ion-exchange material. A sensor probe and a reference probe are positioned in the bed of ion-exchange material vertically displaced from each other. Vo...

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Bibliographische Detailangaben
Hauptverfasser:	PREMATHILAKE, KUMUDIKA, VAN NEWENHIZEN, JOHN
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY CONTROLLING INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASURING METALLURGY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL PHYSICS REGULATING SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES TESTING THEIR RELEVANT APPARATUS TRANSPORTING TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Beschreibung
Zusammenfassung:	An apparatus and method for determining the end of a service step and the duration of a brine/slow rinse step in a water conditioner having a bed of ion-exchange material. A sensor probe and a reference probe are positioned in the bed of ion-exchange material vertically displaced from each other. Voltage from each of the probes are monitored over a plurality of time intervals. When the percent increase in the impedance ratio exceeds a pre-specified value the end of a service step is identified and a regeneration cycle is initiated. During the regeneration step, the rate of change in the impedance ratio of the sensor probe to the reference probe is calculated and used to detect two peaks in the rate of change of impedance ratio between the sensor probe and the reference probe, followed by terminating the brine/slow rinse step after both peaks have been detected.