Aalborg Vortex - Manual (Page 11)

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3.5 Orientation
FIGURE 4
The flow meter uses piezo-electric sensing elements with no moving parts. This
eliminates wear and allows for vertical or horizontal installation.
3.6 Alignment Rings and Gaskets
Alignment rings may be provided with the meter and should be used to ensure
proper alignment of the flow meter to the pipe flanges. Misalignment can result
in percentage errors and can even result in a non-functional meter.
Gasket size and correct installation are essential to accurate measurement.
Care should be taken when installing the flow meter to prevent the slightest
protrusion of the gasket into the flow line. The I.D. of the gasket should be 1/8
inch larger than the I.D. of the meter. This will prevent the gasket from slipping
into the line during installation.
3.7 Identification Check
Before continuing on to the installation of the flow meter, be sure that all of the
parameters of the application match or fall within the limits specified by the iden-
tification sheet. If more than one meter has been purchased, check the I.D.
sheet versus the meter tag to ensure that the correct meter is being installed.