Sika VVX Betriebsanleitung Seite 24

Installation
The VVX can theoretically be installed at any location on a straight pipe.
•
• Flow sensors with plastic pipe sections must be installed in the pipeline stress-free.
• Possibility of run empty
• Possibility of bubble-formation
Length of inlet and outlet sections
Inlet section X1
Outlet section X2
The unit can be installed in both horizontal as well as vertical pipelines. The flow sen-
•
sor is only suitable for use in fully filled piping.
Due to their operating principle, vortex flow sensors are sensitive to the flow profile, so
•
a calming section must always be fitted.
To obtain the highest possible measurement accuracy, straight inlet and outlet sec-
tions matching the inner diameter (VVX15 = 13 mm • VVX20 = 19 mm •
VVX25 = 25 mm • VVX32 = 32 mm • VVX40 = 40 mm) of the device should be
used.
IMPORTANT
External vortices are generated by disturbances (offsets, protruding flat gaskets,
changes in diameter, etc.) of the flow in the inlet and outlet sections. They lead to
false pulses so that the error limits of the VVX can no longer be guaranteed.
 Ensure that the inside diameter of the pipe matches the inside diameter of the
VVX.
 Avoid obstructions in the inlet and outlet sections.
 Provide suitable calming sections at the inlet and outlet.
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• Possibility of bubble-formation
• Possibility of run empty
(Measuring tube partially filled)
VVX15 / VVX20 / VVX25
Min. 10x DN
Min. 5 DN
• No danger of dirt deposits
•
Air bubbles are discharged up-
wards
VVX32 / VVX40
250 mm
Min. 5 DN
© SIKA • Ba_VVX • 06/2021
VVX