Operating Instructions FLOWSIC100
Gas Velocity Monitor
Assembly and Installation
88012513/03-2008 © SICK MAIHAK GmbH · Germany · All rights reserved 59
Note: In vertical ducts, a negative sign is shown on the LCD of the evaluation unit if the direction
of flow is from top to bottom. You can change the values to positive values by entering a
negative linear regression coefficient (see Section 4.3.4).
Preventing condensate accumulations
If standard sender/receiver units are installed in vertical ducts with wet gases, condensate
can accumulate in the flange pipe of the sender/receiver unit A (see Fig. 2.4). The following
solutions can help to prevent measurement problems (malfunctions caused by solid-borne
noise, see Service Manual), or damages when removing the sender/receiver unit (conden-
sate runs out):
• Complete insulation of the flange with pipe (reduces temperatures at the flange with pipe
below the dew point)
• Continuous or periodical condensate drain through an opening (if necessary closeable)
at the deepest point of the flange pipe (e.g. hole Ø 4 mm with stopper, see Fig. 3.5) (only
usable if the condensate is not damaging the installation and environment)
• Backflow of the condensate to the duct through a hose connection between flange pipe
and duct (see Fig. 3.5).
Fig. 3.5: Condensate drain / backflow
Using the sender/receiver units at high dust contents (> 1 g/m³)
Further possibilities see
Section "Reducing the
measuring distance"
The measuring distance must be as short as possible. This requires to install the sender/
receiver units in an angle to the flow direction of 60°.
In addition, rebound protectors (see Section 6.2.4) have to be installed at the downstream
sender/receiver units (B in Fig. 2.4) of the types FLSE100-PH / PHS / H and HAC to prevent
malfunctions of the measuring behavior by impacting of particles on the transducer surface.
Duct wall
Flange with
pipe
Opening with stopper
Condensate drain Condensate backflow
Hose
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