The invention discloses an air circuit adapter that includes an external conduit, an air collector and an internal conduit. The external conduit includes a first interface and a second interface. An exterior surface of the external conduit includes a sampling interface. The interior conduit can affix inside the external conduit. The air collector can be connected with the sampling interface by a sampling air routing. The sampling air path can radially pass through the internal conduit and the external conduit.
