Method for correlating a monitoring device to the end of service life of a filter cartridge

• Main Authors: RAKOW NEAL A, GRYSKA STEFAN H
• Format: Patent
• Language: English
• Published: 22.03.2016
• Subjects: ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS; DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING; FIRE-FIGHTING; HUMAN NECESSITIES; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; LIFE-SAVING; MEASURING; MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR; MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUIDLEVEL; METERING BY VOLUME; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; PHYSICS; SEPARATION; TARIFF METERING APPARATUS; TESTING; TRANSPORTING

Methods of correlating a monitoring device to the service life of a filter cartridge include providing a monitoring device, and calibrating the monitoring device to correspond to the service life of a filter cartridge. The monitoring device comprises a demand substance within a receptacle, a sensing element with a detection point, a reader for the sensing element, and a fluid delivery device. Calibration includes determining the ratio of the residence time of the monitoring device to the residence time of the filter cartridge, and utilizing the ratio to correlate the response of the sensor within the monitoring device to the service life of the filter cartridge. The response of the sensor is correlated to the service life of the filter cartridge by control of the fluid delivery parameters of the fluid delivery device. The fluid delivery parameters include the flow rate, the demand substance mass, the receptacle cross sectional area, the receptacle volume, the receptacle length, and the demand substance packing density.