US Patent:
20040112117, Jun 17, 2004
Inventors:
Kenneth Wright - Bridgton ME, US
Jeffrey Pollard - Gray ME, US
Gary Broniarczyk - Fryeburg ME, US
International Classification:
G01N025/00
Abstract:
A method and apparatus includes filter for removing a non-tracer gas from detection system and control unit for detecting the presence a low concentration tracer gas in the atmosphere.