Back to results
US 6,187,596 B1Granted
Airborne contaminant indicator
AssigneeDonaldson Company, Inc.
InventorsAndrew J. Dallas, Kristine Marie Graham, Timothy H. Grafe
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeDonaldson Company, Inc.
InventorsAndrew J. Dallas, Kristine Marie Graham, Timothy H. Grafe
Estimating the term…
An indicator system provides a visual indication of the cumulative level of an airborne contaminant. The indicator is a transparent sheath with support medium having an acidic surface and treated with a color pH indicator. As a basic contaminant is adsorbed by the medium, the medium color changes. As additional contaminant is adsorbed, the color front progresses the length of the indicator. The indicator system may be used with an adsorptive filter system to predict the life of adsorption bed assemblies. A sample flow is taken upstream of the adsorption beds and is passed through the indicator. Preferably, the flow rate is calibrated so that the rate of the color change in the indicator is proportional to the rate of depletion of the adsorption bed. By monitoring the indicator, an accurate prediction of adsorption bed life may be made.
An indicator system for indicating the level of an airborne contaminant, the system comprising:
A method of indicating the deterioration level of an adsorptive medium for removing airborne contaminants and having a first flow passing from upstream to downstream through the adsorptive medium, comprising the steps of:
A measuring system for measuring the life of an adsorptive filter used to remove an airborne contaminant, the adsorptive filter having flow passing from upstream to downstream through the filter, the measuring system comprising:
Dependencies are inferred from the claim text.