LEAK DETECTOR AND LEAK DETECTION USING HELIUM OR HYDROGEN AS TRACER GAS

摘要

A method and apparatus includes filter for removing a non-tracer gases from sensor (22) in control unit (10) for detecting the presence of a low concentration tracer gas like helium or hydrogen in the atmosphere. The first filter is comprised of an initial layer of activated alumina, followed by a layer of silica gel and anouter layer of activated alumina and removes water vapor The second filter is a Carulite (Registered Trademark) filter and eliminates carbon monoxide and ozone. The second filter is attached externally to a control unit (10), which comprises a pump (12), a particle filter (20), a carbon filter to remove carbon dioxide, a sensor (22) and an insect filter (28). The sensor (22) is a thermal conductivity detector.