ISCO ADFM Pro20 Velocity Profiler For Large Pipes/Open Channels

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


Related products


Yes, the ordering process is very easy. Orders can be made via purchase order or by credit/debit card. Once we have the paperwork we can delivery next day to any location in Europe. Provided with the equipment is a quick start guide, and if you need extra support, the technical support engineers can be contacted via phone call.
No, all of our flowmeters are competitively priced and rental is an ideal option for cutting costs to a fraction of a full priced new flowmeter.
No problem. The quick start guide is designed to make installing the flow meters a simple task. Everything you require for set up will be found in the peli-box supplied with the flowmeter.
Every flow meter is tested upon shipping and return as part of our ISO9001 procedure. Also, as part of this procedure, the flow meter is calibrated once a year. If a copy of the calibration certificate is needed let us know.
The flow meters typically provide an accuracy of ±1 to 2% of rate, so if you are measuring 100l/sec then the accuracy is between 98-102l/sec.
We are here to help. If the self-help and quick start guides do not help, then call one of our technical support engineers on +44 (0) 1527 882060. We have supplied and supported many clamp on rental installations throughout Europe.
First, contact us for a quote. If you are happy with the quote then send us a purchase order. Or alternatively call us with credit card details and fill out and send us a rental agreement form.
If the stock is permitting, and all paperwork is received by 12pm then flow meters can usually be available the next day.
The minimum hire period for flow meters is one week.
Once you have the meter you can rent it for as long as you need it. However, it would help if you can let us know that you wish to extend the rental period. Upon return the meter is off-hired and once checked and tested, an invoice will be issued to you. Also, if you extend your rental past a 4, 8 or 12 week rental threshold, then you are entitled to a discount.
You are only charged for the period of time for which you have the flowmeter. So, if a flowmeter is returned 3 days late you are only charged for 3 extra days, and each of these days is charged at one fifth of the weeks hire cost.
Normally, you will use your own courier but if you have any problems let us know and we can arrange a pick up the day after you notify us, but you will be charged for the carriage and this cost will be added to the invoice.
Without exception, all our flow meters are tested. If you need a 110v plug instead of the standard 230v plug let us know.
All of our standard transducers will do -40degC to +150degC, but this will depend on your application.
  • Liquid: below 50mm CFLP transducers are required, 50-1000mm CRS-402 transducers and 150-8000mm CRS-401 transducers. All the bits you need can be supplied, and delivered with the meter.
  • Gas: below 80mm CRS-402 is required, for 80-300mm the CRS-401/CRV-310 and for above 300mm the CRW-312 transducers are required.
  • High temperatures: For liquid we can measure +450degC for liquid and for gas/steam +250degC. But please consult RS Hydro.
Of course, we make a small surcharge for each set of transducers. Most applications only require one set, but on occasion some people may require two, for more diverse pipe sizes and applications.
An ultrasonic wall thickness gauge, that measures to within 0.05mm, is provided as standard with all flow meter rental packages.
The screendump facility on the integrated dataloggers on all our flow meters, allows you to photograph any screen and download it to your pc.
After the equipment has been shipped, it is the responsibility of the hirer. However, in our experience it is rare that any of our flow meters are damaged. Our flow meters are tough, as well as accurate, and reliable.
We have hired more ultrasonic clamp on flow meters than any other company in Europe. We are now one of the world's largest distributors of GE Panametrics flow meters. We always review your application before hire so no unwanted surprises are encountered. Every effort has been made to make your flow meter hire and enjoyable experience: quick start guides to help you set up with ease, online videos for further help, rugged packaging for extra durability anywhere, and real flow engineers available for online/telephone support.