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D-2
MiniCapt® Mobile Operations Manual
Appendix D
: Compressed Gas Sampling Operation
Introduction
Description
The Kit contains:
•
Diffusion chamber with specially designed critical orifice
•
Special dual connection BioCapt impactor
•
Absolute filter (a sterile version can be purchased with the P/N 1000021454)
•
Solenoid valve
•
Solenoid cable
•
Pressure regulator
•
Pressure tubing
Diffusion Chamber
The AISI 316L stainless steel expansion chamber is connected to a dual connection
BioCapt Impactor. The overpressure air is released to the environment through an
absolute filter.
The threaded connection is G1/8 BSPP.
•
The Compressed Gas Kit default tubing connection is 6 mm.
Special
Dual
Connection
BioCapt
Impactor
BioCapt dual connection impactor:
•
Bottom: female connection with hook to attach to the base of the MiniCapt
Mobile
•
Top: male connection to the MiniCapt Compressed Gas Diffusion Chamber
This special dual-connection impactor differs only from the standard BioCapt
Impactor in that the top connection makes it possible to connect the compressed gas
diffusion chamber.
Absolute
Air
Filter
The absolute filter performs a dual function:
•
Filtering the overpressure air that is expelled from the diffusion chamber.
•
In the case of pressure inversion due to low pressure/flow from the high pressure
gas source, the absolute air filter provides filtration of the incoming air to the
diffusion chamber to prevent contamination. Any pressure inversion condition
will immediately result in a sampling interruption and instrument alarm.