High aspect ratio vacuum air sampling assembly

A vacuum air sampling assembly comprising:

• a first canister module including:
• a first conduit having an aspect ratio of at least 30:1, a first portion of the first conduit constituting at least 50% of a length of the first conduit being disposed in a first coil, defining a first coiled portion of the first conduit;
• a first inlet disposed at a first inlet end of the first conduit;
• a first outlet disposed at a first outlet end of the first conduit, the first outlet being in fluid communication with the first inlet through a first internal volume of the first conduit;
• a first outlet valve attached to and in fluid communication with the first outlet;
• and
• an air sampling train attached to and in fluid communication with the first inlet, the air sampling train including:
• a first inlet valve in fluid communication with the first inlet;
• and
• a precision orifice,
• wherein the first inlet valve and the first outlet valve are configured to isolate the first internal volume of the first conduit from fluid communication with an external environment when the first inlet valve and the first outlet valve are closed;
• and
• a second canister module, including:
• a second conduit having an aspect ratio of at least 30:1, a second portion of the second conduit constituting at least 50% of a length of the second conduit being disposed in a second coil, defining a second coiled portion of the second conduit;
• a second inlet disposed at a second inlet end of the second conduit;
• a second inlet valve attached to and in fluid communication with the second inlet;
• and
• a second outlet disposed at a second outlet end of the second conduit, the second outlet being in fluid communication with the second inlet through a second internal volume of the second conduit;
• and
• a second outlet valve attached to and in fluid communication with the second outlet,
• wherein the second inlet valve and the second outlet valve are configured to isolate the second internal volume of the second conduit from fluid communication with the external environment when the second inlet valve and the second outlet valve are closed, and
• wherein the second inlet valve is configured to attach to the first outlet valve via a first union disposed between the first outlet valve and the second inlet valve such that when the first outlet valve and the second inlet valve are open, the second internal volume is in fluid communication with the first internal volume.