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

Specifications ADFM® Pro20 Velocity Profiler Measurement Performance Flow Rate Data Management ADFM Pro20 Data Types Flow Accuracy: 1-2% of reading (under normal flow conditions) Velocity Maximum Velocity: Velocity Bin Size: Vertical Profiling Range: Accuracy: ±30.0 ft/s (±9 m/s) 2 to 12 inches (50 to 300 mm) - user selectable 9 inches to 20 feet (230 mm to 6 m) nominal, for particle concentrations of 50-1000 ppm 0.5% of reading ± 0.01 ft/sec (3.0 mm/s) Water Level Measurement Range: Accuracy: 4.5 inches to 20 feet (110 mm to 6 m) 0.5% of reading ± 0.02 in (0.5 mm) Acoustic Frequency Frequency:...