ADFM Pro20 Large Pipe Velocity Profiler0 pages

ADFM® Pro20 Velocity Profiler
for Large Pipes and Open Channels
The ADFM® Pro20 flow meter brings
unparalleled flow rate measurement accuracy
to a traditionally difficult measurement
environment: large pipes and channels. The
Pro20 measures flow rate to within 2% of actual
value, in flow depths up to 20 feet (6 m).
ADFM pulse-Doppler velocity profiling
technology measures the velocity distribution
within the flow, delivering advanced flow
measurement performance, making the most
suitable choice for metering sites at large pipes
and open channels, particularly those with nonuniform, rapidly changing, backwatered, near
zero, zero, or reverse flow conditions.

Principles of Operation
Four (4) piezoelectric ceramics in the sensor
emit short pulses along narrow acoustic beams
pointing in different directions to measure
velocity. A fifth ceramic mounted in the center
of the sensor assembly, and aimed vertically,
is used to measure the depth.
Each acoustic beam measures velocity at
multiple points, or “bins”, within the water
column. The measured velocity data within each
bin are very precise – to within 0.01 ft/s. The
measurements are then used to determine the
flow pattern over the entire flow cross-section.
Since the flow pattern and measured velocity
distribution are dependent on each other, the
Pro20’s advanced flow algorithms automatically
adapt to changing hydraulic conditions. This
removes the need for in-situ calibration and
insures accurate flow rate measurement over
a host of different measurement environments
and hydraulic conditions.

The ADFM electronics unit houses the signal
processing, data logging, and data output
electronics. It is available as a NEMA 4X box
enclosure – suitable for wall or console
mounting in permanent applications – or
a NEMA 6P cylindrical enclosure – for use
in manholes or other “wet” environments.

Applications
Wastewater collection systems
Combined sewer systems and outfalls
Wastewater treatment facilities
Irrigation canals and channels
Industrial process and discharges
Stormwater conveyance and outfalls

Standard Features
Pulse-Doppler velocity profiling technology
Redundant velocity sensors and depth
sensor combined in a single, compact
housing
Upward looking sensor mounts on a
stainless steel band and is positioned in the
channel invert
Data quality verification information
(signal strength and correlation)
In-situ calibration never required
Real-time data output
Industry standard communications protocol
interfaces (optional)
Secondary depth sensor (optional), pressure
or ultrasonic