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Fig.2
Fig.3
Fig.4
Mounting position
Measuring part of sensor (rotor for paddlewheel and pins for magmeter)
should be positioned at 12% of ID where, basing on insertion theory, average
velocity can be measured.
The reading accuracy of insertion flow sensors can be affected by:
• air bubbles;
• sediments;
• friction between shaft and bearings (only for paddlewheel).
In a horizontal pipe runs, the mounting position to get the best performances is
at a 45° angle (Fig. 3) to avoid air bubbles as well sediments. Vertical position
(Fig. 2) can be chosen in case air bubbles are not present. Do not mount the
sensor on the bottom of the pipe (Fig. 1) if sediments are likely. Do not mount
paddlewheel at 90° otherwise friction can affect measurement.
Installation in a vertical pipe runs can be done fixing any orientation.
Upward flow is preferred to ensure full pipe.
7
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