Operating Instructions FLOWSIC100
Gas Velocity Monitor
Assembly and Installation
88012513/03-2008 © SICK MAIHAK GmbH · Germany · All rights reserved 61
Maximum possible wall (and insulation) thickness as a function of the nominal length of the
flanges with pipe, flange size (pipe diameter DR) and installation angle a (Le = 20 mm):
Reducing the measuring distance
To prevent problems in signal transmission in certain cases (e.g. using the types FLSE100
H, HAC, PH or PHS with high dust concentrations, see Section 2.3.1), it can be necessary to
reduce the measuring distance. You can realize this by installation of extended flange pipes
and/or flanges with pipe across a secant.
The installation conditions are provided in Fig. 3.7 and in the following table.
Fig. 3.7: Installation across secant
Nominal
length L
F
[mm]
Maximum wall (and insulation) thickness w [mm]
D
R
= 114.3 D
R
= 76.1 D
R
= 48.3
α = 45° α = 60° α = 45° α = 60° α = 45° α = 60°
125 15 45
200 49 97 68 110
350 112 196 155 227 174 240
550 253 369 297 400 315 413
750 395 543 438 573
L = Active measuring path
Le = 20 ... 500 mm
a
max
=Di / 4
α = 60°
Ld as in
Fig. 3.5
with a = a
max
and circular ducts
then (α = 60°)
Di
max
=L +2 Le + Ld
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