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2.3 Sampling System
The VC4™ is a monitoring center for sampling lines from sample locations. As they apply to the
VC4™ system, the words point, line, and location require definition:
A location is a place to be monitored
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Sample atmosphere runs from the location to the VC4™ system via a line
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Each of the 4 sample tubing connections on the VC4™ system corresponds to a point. The
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system draws air simultaneously from all locations. Two different types of flow are:
Transport flow: high-velocity, large-volume air movement through the lines
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Sample flow: air admitted to the Chemcassette™ detection system
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The high speed of transport flow allows rapid monitoring and response time when using long
lines from monitored locations to the VC4™ system. A small portion of the transport flow
(sample flow) is analyzed to determine concentration levels.
The complete sampling and monitoring system consists of the following components:
Sample lines to all monitored locations
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Flow connections through quick-connect ports on back of unit
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Vacuum pump
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Manifolds, Orifices, Chemcassette™ and filters
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Flow controlling manual needle valve
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Exhaust port
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There are 4 inlets, one for each monitored location. One exhaust port is also located at back of
the VC4™ cabinet.
VC4™
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User Manual
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