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4.5
Aeration
If there is a point where the difference in level is higher than 5 m an air inlet valve should be
installed after the sensor to avoid a vacuum effect that could damage the sensor liner.
4.6
Reduction of DN
In installations where, due to reasons of the flow rate to be measured, a sensor of a smaller
DN than the pipe DN must be mounted, the reduction must be done with an angle smaller
than 4º to avoid turbulences that can give false readings.
If the angle cannot be so small, straight pipe sections indicated in point 4.2 must be kept.
4.7
Vibrations
Vibrations of the pipes should be avoided by anchoring the pipe before and after the sensor.
The vibration level should be less than 2.2 g in the range of 20-150 Hz according to IEC 068-
2-34.
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