Patent ID: 8089367
Filing Date: 2012-01-03
Classification: B01D,G01N,G08B

Abstract:
1. An air monitoring apparatus comprising: a housing, said housing comprising at least one fluid passage to permit a fluid to enter said housing; and a constituent detection device positioned in said housing, said detection device comprising: a power supply electrically coupled to said at least on electrode, said power supply configured to generate an AC signal; and a logic circuit electrically coupled to said power supply, said logic circuit configured to detect a change in at least one of impedance magnitude and a phase shift angle magnitude as a function of applied frequency when said detection device contacts at least one fluid constituent contained in the fluid flowing into said housing through said at least one fluid passage or when said detection device contacts at least one constituent in a solid wherein at least one of chemical and material properties of the solid change as a function of fluid flowing into said housing through said at least one fluid passage.