The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 01, 2009
Filed:
Apr. 07, 2006
Edward Colby, Cambridge, GB;
Neil Stewart, Bromley, GB;
Edward Colby, Cambridge, GB;
Neil Stewart, Bromley, GB;
Masco Corporation, Taylor, MI (US);
Abstract
The present invention relates to a system for measuring the level of granular material in a container immersed in an aqueous medium, particularly, but not exclusively, for use as a measure of sanitizer level in spa and whirlpool halogenation systems. Electrodes fixed in the container wall are used to measure the electrical conductance along a path which is part filled with the granular material. Coils of wire are arranged such that the interrogating signal is coupled inductively to the sensor head. In this way the granule container can be made demountable, with no bare conductor material exposed to the aqueous medium. A separate reference circuit is used to measure the conductivity of the water in the system, and this signal is used to normalize the signal obtained from inside the container.