Assembly and Installation
FLOWSIC100 · Operating Instructions · 8012513/YSA5/V2-1/2016-07 · © SICK Engineering GmbH 51
Subject to change without notice
3.1.1 Determining the measurement and installation location
Flow profile
Measuring precision is subject to the flow conditions and the position of the measurement
axis. Significant changes in the cross-section, duct curvatures, fittings in the duct, air
dampers, or inlets can cause profile deformations or turbulence that will impair the result
of the measurement. To ensure measurement is as accurate and trouble-free as possible,
select a measuring location where the gas flow is, to a large extent, homogeneous (
Fig.
26).
Regular, unimpeded profiles are most likely with long inlet and outlet sections. The longer
the inlet section, in particular, the greater the reproducibility of the measurement results. If
possible, the inlet section should be more than 20 times greater, and the outlet section 10
times greater than the internal diameter of the duct (Di). With rectangular cross-sections,
the diameter is calculated as 4 times the cross-section divided by the duct circumference.
On existing installations, choose the optimum location.
If flow conditions are uncertain, measure the profile at the measuring location, for
example, using dynamic pressure probes (see DIN EN 13284-1). Calibration apertures
must be provided for this purpose. The measuring axis must then be defined in such a way
that any changes in the profile will only have a minimum impact on the result of the
measurement.
If the FLOWSIC100 is to be used for official measurements (for example, emission
measurements pursuant to BlmSchV), the measuring location should be determined by a
legally authorized expert (for example, by means of an expert appraisal of a measuring
location authorized in accordance with BlmSchV Articles 26 and 28).
Fig. 26 Installing the sender/receiver units
Installation with short inlet section
View A
Installation with inlet and outlet sections of sufficient length
Duct/pipe-
line
Inlet section Outlet section
Flow distribution
not uniform down-
stream of curvature
Uniform flow distribution
Sender/receiver unit
Di
A
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