A device for accumulation of vapor analytes incorporating nanotubes grown by CVD is described. The banking machine includes a computer having an HTML document handling portion. In some examples, the system adds or modifies global filters or system performance based on information from the system. The shield assembly includes a guard member and a bumper member, and an alignment feature configured to align the relative positions of guard member and the bumper member, thereby positing the members in a predetermined relative orientation.