2-8 Installation and Operation 5707070-A
Advanced Energy
®
When the Doppler transducers are mounted on a horizontal pipe, care should be taken
to mount them in the 7 o’clock and 10 o’clock positions (with the top of the pipe—the
side furthest from the Earth—corresponding to the 12 o’clock position). If the
transducer is mounted on the bottom of the pipe, settling particles may attenuate the
signals by introducing an additional sonic barrier. Also, air may agglomerate at the top
of the pipe. Since the ultrasonic frequencies used will not penetrate air efficiently, the
signal will be heavily attenuated so that the meter will not be able to render accurate
results.
Horizontal Pipe Mounting
The recommended placement of the Doppler transducers is a horizontal section of
piping. Figure 2-2 provides horizontal mounting examples.
Figure 2-2. Horizontal pipe mounting examples
Vertical Pipe Mounting
Measuring flow at a vertical pipe run is not recommended. If measuring flow in a
vertical run can not be avoided, we recommend you measure at a point where the
direction of flow through the pipe is upwards to help ensure the pipe will remain full
at all times (Figure 2-3). However, measuring flow even with an upward vertical pipe
run will not address all the problems associated with this configuration.
Figure 2-3. Vertical pipe mounting examples
Transducers
Transducers
