ADFM Pro 20 - Acoustic Doppler Flow Meter (ADCP) (Discontinued)

  • Pulse-Doppler velocity profiling technology
  • In-situ calibration never required
  • Quad-redundant velocity sensors and depth sensor
  • Highly Accurate +/- 1 to 2% of reading.
Product Options



Inside the ADFM Pro20 flow sensor are four piezoelectric ceramics which emit short pulses along narrow acoustic beams pointing in different directions to measure velocity. A fifth ceramic is mounted in the centre of the sensor, and aimed vertically, is used to measure depth. Each acoustic beam measures velocity at multiple points in the water column. Each measured velocity data point is very precise to within 0.01ft/s.

This distribution of accurate velocity measurements is then used to determine the flow pattern over the entire cross-section of flow. Since the flow pattern and measured velocity distribution are dependent on each other, the ADFM's advanced flow algorithms automatically adapt to changing hydraulic conditions within the pipe. This insures accurate flow rate measurement over a host of different measurement environments and hydraulic conditions. This also removes the need for in-situ calibration.

The data logging, signal processing and data output electronics are all housed in the ADFM enclosure. The enclosure is available as a NEMA 4X Box housing which is suitable for wall or console mounting in permanent applications, or a NEMA 6P cylindrical housing for use in manholes or other "wet" environments.

Standard Features

  • Pulse-Doppler velocity profiling technology
  • Upward looking sensor mounts on a stainless steel band and is positioned in the channel invert
  • Rugged, long lasting construction
  • Real-time data output
  • Data quality verification information (signal strength and correlation)
  • In-situ calibration never required
  • Quad-redundant velocity sensors and depth sensor combined in a single housing

Manufactured by: Teledyne ISCO
Model: ADFM Pro 20 - Acoustic Doppler Flow Meter (ADCP) (Discontinued)

Services offered for this product

  • Sales
  • Rental
  • Installation
  • Calibration
  • Maintenance


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


ADFM Pro20 Measurement Performance - Flow Rate
Flow Accuracy 1-2% of reading
Measurement Performance - Velocity
Velocity Range ±30.0 ft/s (±9 m/s)
Velocity Bin Size 2 to 12 inches (50 to 300 mm) - user selectable
Vertical Profiling Range 9 inches to 20 feet (230 mm to 6 m) nominal, for particle concentrations of 50-1000 ppm
Accuracy 0.5% of reading ± 0.01 ft/sec (3.0 mm/s)
Measurement Performance - Water Level
Measurement Range 4.5 inches to 20 feet (110 mm to 6 m)
Accuracy 0.5% of reading ± 0.2 in (5 mm)
ADFM Pro20 Acoustic Frequency
Frequency 1.23 MHz
Physical - ADFM Pro20 Electronics Unit
Electronic Unit Configurations Cylindrical canister or wall-mount box
Operating Temperature -15 to 125°F (-26 to 52°C)
Storage Temperature -65 to 160°F (-54 to 71°C)
Packaging NEMA 6P (IP 68) for canister; NEMA 4X for box
Dimensions Canister - 28.5x10 in. (724 x 254 mm); Box - 17.5x14.8x6.7 in (445x375x170 mm)
Weight Canister Housing 36 lbs (16 kg); Box Housing 24 lbs (11 kg)
Physical - ADFM Pro20 Sensor
Operating Temperature 23 to 95°F (-5 to 35°C)
Housing Material Urethane
Static Pressure 250 psi Nominal
Dimensions 8 x 3 x 1.5 inches (200 x 75 x 40 mm)
Weight 3.2 lbs (1.5 kg)
Physical - Sensor Signal Cable
Operating Temperature -40 to 125°F (-40 to 52°C)
Physical Polyethylene jacket
Length 33 ft (10 m) std. (optional 150 ft length (45 m) available)
Minimum Bend Radius 6 in (150 mm)
Outer Diameter 0.5 in (13 mm) nominal
ADFM Pro20 Data Types
Q, V, D Discharge, average velocity, depth
Velocity Velocity profile data (relative to acoustic beam directions) per beam and bin
Echo Intensity Echo intensity data (relative backscatter intensity) per beam and bin
Data Quality Profile data quality indicators (Correlation magnitude, % - Good) per beam and bin
Temperature Transducer temperature output, range 20 to 125°F (-7 to 52°C)
Sound Speed One output for speed of sound data
Leader Output of general leader information (time, data, record number, etc.), and for vertical beam data
Data Storage and I/O
Data Storage Capacity 32 MB std. (300,000 measurements); up to 440 MB optional
Data I/O Interface RS-232 standard. Multiple industry-standard analog and digital protocols optionally available
Internal Battery Voltage 24 VDC nominal
Internal Battery Capacity 26 Ah at 75°F Alkaline. Battery life 22 weeks at 15 minute sampling interval
External DC 12 to 36 VDC; 10 VDC absolute minimum; 36 VDC absolute maximum
Compatible Software WinADFM Software for Windows 98, 2000, NT, XP


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