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Doppler Ultrasonic Flow Meter

Ultrasonic Doppler Flowmeter

C$3 705.66

Item# FD-410

In stock

Lead Time (If not in stock): 4 weeks
Ultrasonic Doppler Flowmeter FD-410 FD-410
  • Non-Intrusive, Clamp-On Transducer for Most Pipes from 6 mm to 3m (1/4 to 120')
  • Insertion Probe Transducer Also Available
  • Wide Measuring Range of 0.05 to 9 mps (0.15 to 30 fps)
  • ±2% of Calibrated Span Accuracy

FD-410 Model Options

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Output Signal
Supply Power
Velocity Range
Pipe Diameter Range
Media Type
Form Factor
Max Process Temperature

The FD-400 Series ultrasonic doppler flowmeters measure the flow of liquids that contain sound reflectors, suspended solids, or gas bubbles larger than 100 microns. These sophisticated instruments automatically adjust filtering and gain settings to produce reliable readings in a wide range of liquid and reflector conditions.

The FD-400 flowmeter transmitts ultrasonic sound through the pipe wall or from the probe tip into the flowing liquid by using piezoelectric crystals contained in the transducer and probe tip. The sound is then reflected by sonic reflectors suspended in the liquid and recorded by the receiver. If the sonic reflectors are moving within the sound transmission path, sound waves will be reflected at a frequency shifted (Doppler frequency) from the transmitted frequency. The difference between the 2 frequencies is directly proportional to the speed of the sonic reflectors, resulting in a liquid flow rate that is converted to various user-defined units.

Configuration of the FD-400 is accomplished via the front-panel keypad. A 2-line backlit LCD displays rate and total in user-selected units. Power supply options include AC and DC. Optional outputs include 4 to 20 mA, relays, and rate pulse.

Two transducer styles are available. The FD-400C clamp-on, non-intrusive transducer is recommended for most metal or plastic pipes. The FD-400C has a NEMA 6P (IP68) rating and is available in a high-temperature version, "=HT". The user can place these clamp-on transducers up to 305 m (1000') from the display enclosure. The FD-400I insertion probe transducer should be used on piping systems that do not permit ultrasonic penetration. The FD-400I inserts into the pipe wall and comes into direct contact with the flowing liquid.


Measuring Principle: Doppler ultrasonic
Flow Velocity Range: 0.05 to 9 mps (0.15 to 30 fps)
Accuracy: ±2% FS over calibrated span
Liquid Types: Liquids containing 100 ppm of useful sonic-suspended reflectors greater than 100 microns

Enclosure: NEMA 4X (IP66), polycarbonate, stainless steel, brass, plated-steel mounting brackets
Dimensions: 178 H x 146 W x 99 mm D (7.00 x 5.75 x 3.88")
Power Supply: 115 50/60 Hz(Standard), 230 Vac, 50/60 Hz ±15% @ 5 VA max (Optional) ; 12 to 28 Vdc @ 2.5 VA max (Optional)
Display: 2-line x 8-character LCD; LED backlighting; top row, 7-segment 18 mm (0.7"); bottom row, 14-segment 9 mm (0.35"); 8-digit rate, 8-digit total (resettable)
Units: User configured—feet, gallons, ft3, mil-gal, meters, liters, mil ft3, m3, mil-liters, acre-feet, oil barrels (42 gallon), liquor barrels (32.5 gallons), lb, kg
Rate: Interval—second, minute, hour, day
Totalizer exponent: E-2 to E+6
Response Time: User selectable, 1 to 60 seconds
Outputs: 4 to 20 mA, 800 ? max; internal or external power supply; 12-bit resolution; optically isolated
Dual Relay: Independently configured; form “C”, 200 Vac @ 0.5 A resistive; rate alarm, totalizer pulse, error
Rate Pulse: 2 output types— 500 mVac or open collector; 2500 Hz max; 12-bit resolution; 500 mV AC into 2 k? min; open collector 1 A at 100 V max
Multiple Meters: Synchronization provision included—used for multiple meter/single pipe system; up to 4 meters may be interconnected to 30 m (100') apart
Keypad: 4 pushbutton keys
Operating Temperature: General purpose, 40 to 85°C (40 to 185°F)

Type: Compression-mode ultrasonic, 625 kHz
Housing Material:
    Standard Clamp-On: NEMA 6P (IP68), -40 to 100°C (-40 to 210°F), CPVC, Ultem®, nylon, PVC (cable jacket), aluminum (small pipe)
    High-Temp Clamp-On: NEMA 4 (IP65), -40 to 200°C (-40 to 400°F), Vespel®, anodized aluminum, nickel-plated brass, PFA (cable jacket)
    Doppler Probe: NEMA 6 (IP67) -40 to 100°C (-40 to 210°F); 700 psi (48 bar) max, 316 SS, Ultem®, FKM, nylon, PVC (cable jacket)
    Optional Flexible Armored Conduit: Zinc-plated steel, PVC
Cable Length:
    Standard Lengths: 6 m (20') standard
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Rated 3 out of 5 by from Works well, lacking in quality. Must double check the metered fluid has appropriate solid particle size and concentration. The totalizers typically last me about 1-2 years before it stops working. The transducers seem to last 2-4 years before needing to be replaced. Its not easy to get them repaired (transducers are repairable) through Omega customer service. In general, its a good meter for solid laden fluids (double check particle size and conc.) but I'd like to see the quality improved for longer life.
Date published: 2016-05-31
Rated 5 out of 5 by from Versatile Flow Meter Easy to set-up. Came fast. Large easy to read display
Date published: 2023-04-26
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What comes in the box with the Item # FD-410?

Asked by: ReoL
Thank you for your inquiry. The FD-410 is the ultrasonic flow meter transmitter with the display and includes the wall mount bracket, NIST certificate, manual, and transducer is sold separately.
Answered by: JC ENGR
Date published: 2020-11-20

The installation manual (Fig 3.2) shows the transducer wires as red and black, however they are actually blue and white. How should they be wired?

Asked by: H20D
Thank you for your inquiry about the Doppler flow meter. The correct configuration is the Blue wire is Red per Fig 3.2 and the White wire is Black.
Answered by: Applications Engineer JC
Date published: 2021-06-11
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