Patent ID: 7159474

Claim:
A sampling device configured to cooperate with an inlet device at an inlet and an air pump comprising: a central housing including an upstream portion and a downstream portion; the upstream portion including provisions to receive a first filter holder, the first filter holder containing a first filter; the downstream portion including provisions to receive a second filter holder, the second filter holder containing a second filter; wherein sampling matter is drawn into the inlet and divided into a first stream that interacts with the first filter and a second stream that interacts with the second filter; wherein the first filter holder and the second filter holder are substantially similar in shape and size; wherein the first filter holder is disposed upstream of the second filter holder; wherein the second stream enters a first flow passage of the central housing after entering the inlet; wherein the first filter holder includes a flow passage adjacent to the first flow passage of the central housing; wherein the flow passage of the first filter holder and the first flow passage of the central housing form the inlet; wherein the flow passage of the first filter holder is generally semi-circular and the first flow passage of the central housing is generally semi-circular and both the flow passage of the first filter holder and the first flow passage of the central housing form a generally circular inlet; wherein the first filter holder is disposed on an upstream portion of the central housing and the second filter holder is disposed on a downstream portion of the central housing; and wherein the flow passage of the first filter holder and the first flow passage of the central housing form the inlet.