Design and function
Instruction Manual VisGuard 2 Extractive
14265E/1
15
4
Design and function
4.1
Design of the sampling system
The sampling system can be divided up into the following areas:
Sample taking
ensures that a re-
presentative sample of the medium
to be measured is taken at the cor-
rect point. The sampling point comes
directly into contact with the monito-
red, “contaminated” area. All other
components can be protected by po-
sitioning them in “clean” areas.
Sample transport
is essentially ma-
de up of lines that are used to trans-
port the sample from the s ampling
point to the measuring instrument.
The correct dimensioning and routing
of the lines are decisive for this part
of the measuring system. When mul-
tiple sampling is carried out, a valve
unit is installed downstream of samp-
le transport to ensure the correct
measuring point is selected.
Figure 1: Overview of the sampling system
Sample conditioning and monitoring
is made up of optional components that are used
to condition the sample and monitor the sample flow.
Finally, the
sample return
ensures that the sample is returned to a suitable point in an e n-
vironmentally friendly manner. The fan is an important part of the sample return and genera-
tes the necessary vacuum for the sample flow. The purging air required by the photometer is
also part of the sample return (
photometer documentation).
