Patent ID: 7240535

Claim:
A system for normalized detection of gas emanating from a fluid source, which comprises: a sensor for detection of a select gas species; a trap for said gas species or for one or more unwanted gas species; a pump for inducing gas-flow in said system; a plurality of valve assemblies, each said valve assembly being interconnected with said sensor; said plurality of valve assemblies including a first valve assembly also interconnected with said trap, which trap is interconnected with said fluid source, said first valve assembly being variable between a first position in which it affords a path between the sensor and the trap and a second position in which it affords a path between the trap and the pump circumventing the sensor; and said plurality of valve assemblies including a second valve assembly also interconnected with said fluid source, said second valve assembly being variable between a first position in which it affords a path between the sensor and said fluid source and a second position in which it affords a path between the pump and said fluid source circumventing the sensor.