Patent ID: 8240201

Claim:
An air monitoring device ( 100 ), comprising: an outer casing ( 101 ) configured to receive an airflow ( 102 ) comprising particulate; a bore ( 103 ) located inside the outer casing ( 101 ); a collection probe ( 104 ) located inside the outer casing ( 101 ), the collection probe ( 104 ) being configured such that there is a gap ( 105 ) between an exit of the bore ( 103 ) and an entrance of the collection probe ( 104 ), such that particulate in the airflow ( 102 ) having a diameter larger than a threshold flows through an interior of the collection probe ( 104 ), wherein a portion ( 106 ) of the airflow ( 102 ) comprising particulate having a diameter smaller than or equal to the threshold flows through the gap ( 105 ) and between an exterior of the collection probe ( 104 ) and an interior of the outer casing ( 101 ); and a frit ( 108 ) located on the outer casing ( 101 ) between the gap ( 105 ) and an exit of collection probe ( 104 ), the frit ( 108 ) configured to sample the portion ( 106 ) of the airflow ( 102 ) comprising particulate having a diameter smaller or equal to than the threshold.