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

摘要

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.

主权项

1. A method of correlating a monitoring device to the service life of a filter cartridge comprising:
providing a monitoring device; and calibrating the monitoring device to correspond to the service life of a filter cartridge, wherein the monitoring device comprises:
a demand substance capable of absorbing an organic vapor within a receptacle;a sensing element with a detection point;a reader for the sensing element; anda fluid delivery device, the fluid delivery device comprising fluid delivery parameters, wherein the fluid delivery parameters and the detection point of the sensing element are correlated to the service life of a filter cartridge, and wherein calibrating the monitoring device to correspond to the service life of a filter cartridge comprises:
determining a residence time for the filter cartridge;determining a residence time for the monitoring device;determining the ratio of the residence time of the monitoring device to the residence time of the filter cartridge; andutilizing the ratio to correlate the response of the sensor within the monitoring device to the service life of the filter cartridge.