Instructions for Use SS 20.261
Page 6
General installation conditions
Preferably the sensor should be mounted in horizontal pipes.
The sensor should preferably be installed in horizontally positioned
pipes. A downward flow with low flow speeds (< 1 m/s)
2
can lead to
increased deviations and must be avoided for this reason.
!
Avoid installation in a pipe or chamber with downward flow
because the lower measuring range limit can rise significantly.
The sensor measures the flow speed correctly only in the direction given
on the housing and sensor head (arrow). Make sure that the sensor is
adjusted in flow direction; a tilting of up to ±3° is allowed
3
.
!
The sensor measures unidirectional and must be adjusted
correctly relative to the flow direction.
A sensor mounted in opposite direction of the flow direction leads to
wrong measuring values (too high).
!
The lower measuring range limit is according to the system
requirements 0.2 m/s.
The center of the chamber head is the actual measuring point of the flow
measurement and must be placed in the flow as advantageous as
possible, for example in the middle of a pipe (see Figure 1). Therefore
this point is also used for specification of probe length L (see Figure 3).
Figure 1
Positioning in a pipe
!
The sensor head must be located in the
center of the pipe
to
obtain a correct measurement inside the pipe.
2
In case of vertical downdraft and maximum overpressure of 8 bar.
3
Measurement deviation < 1 %
Flow
Direction of measurement
