Sampling cartridge for gas sampling apparatus
A sampling cartridge for a gas sampling apparatus includes a shell having a cylindrical wall and a sampling window extending through the wall. A pair of spools are coaxially and internally positioned within the shell. The spools are independently rotatable relative to the shell. A first spool may include multiple interval sample collectors while the second spool includes a duration sample collector. Each spool also has a window closing surface which is positioned adjacent the window whenever an access door of the gas sampling apparatus is opened. The sampling cartridge may also include a fully encapsulated section of sample collector material as a negative control, and an integral RF tag for storing chain of custody information including personal identification information of a cartridge replenisher.
1 - 20 . (canceled)
21 . A sampling cartridge for gas sampling apparatus, comprising:
a cylindrical shell having a sampling window extending through a cylindrical wall of said shell; and
a pair of self-sealing sample substrate supporting spools inside said shell, each spool having at least one sample substrate supported at a first circumferential location of a curved surface of the spool and a window closing surface at a second circumferential location of said curved surface; and each spool is self-sealed by rotating its window closing surface into alignment with said window.
22 . The cartridge of claim 21 , wherein said shell is transparent.
23 . The cartridge of claim 21 , wherein said shell includes a radio frequency tag for storing chain of custody information.
24 . The cartridge of claim 23 , wherein said chain of custody information includes personal identification information of a cartridge replenisher.
25 . The cartridge of claim 21 , further including a fully encapsulated portion of virgin sample substrate material for use as a negative control.
26 . The cartridge of claim 21 , wherein a first spool of said pair includes multiple circumferentially spaced interval sample substrates, a second spool of said pair includes a single duration sample substrate, and said first and second spools are independently rotatable relative to said shell.
27 - 30 . (canceled)