Kathleen A Kerns

US Patent:

56184930, Apr 8, 1997

Filed:

Aug 29, 1994

Appl. No.:

8/297141

Inventors:

Mark K. Goldstein - Del Mar CA
Michelle S. Oum - San Diego CA
Kathleen L. Kerns - San Diego CA

Assignee:

Quantum Group, Inc. - San Diego CA

International Classification:

G01N 2101
G01N 3122

US Classification:

422 57

Abstract:

An improved carbon monoxide sensor system has a dual sensor system having two sensors disposed in a series arrangement within a sensor housing. Each sensor is formed from a porous semi-transparent substrate that is impregnated with a different chemical sensor reagent. At lease one sensor substrate surface is treated with a chemical compound before being impregnated to increase average pore size and, thereby, increase the sensitivity of the sensor. One sensor is formed from a chemical sensor reagent designed to perform at a lower to middle humidity and temperature range. The other sensor is formed from a chemical sensor reagent designed to perform at a middle to high humidity and temperature range. The dual sensor system constructed in this manner provides good carbon monoxide sensitivity at temperature and humidity conditions required by the standards of UL-2034.