12
Additional Devices
Control valves, inspection glasses, etc., should be installed at least 1
×
L from the transducer
flange.
De-coupled pairs of Transducers
Transducers of the same size (or operating frequencies within 3 Hz) should not be installed in
close proximity (< 4 L) in the same pipeline or connected via a mutual mounting frame unless
they have been specially frequency de-coupled by the manufacturer (see Fig. 11).
The first 5 digits of the RB (shown on the Data Plate and on the Calibration Certificate) give
the operating frequency of the transducer with water.
Fig. 11 Mounting of matched transducers serial or parallel
2.2.2 Requirements of the Piping System
Fixing
The mounting supports must be kept as short and as rigid as practical to prevent excitation of
resonant vibrations by the transducer (see Fig. 12). Additional cross bracing is necessary
when the maximum support length s
m
is exceeded (see Fig. 13).
Fig. 12 Mounting with rigid supports
