Ultrasonic Flow Meters
20+ Years Manufacturing Experience
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Advanced non-intrusive Doppler sensing calibrated for complex liquid matrices
The DF6100 Doppler ultrasonic flow meter is explicitly engineered to solve the most difficult liquid metering challenges. Unlike conventional electromagnetic meters or differential pressure devices, this system is optimized to measure the volumetric flow of solids-bearing or aerated liquids contained in closed conduits.
To achieve optimal measurement accuracy, the conduit must remain full of liquid and contain at least 100 ppm of acoustic reflectors—specifically air bubbles or suspended particles where at least 20% exceed 100 microns in size.
Learn more about standard measurement standards at the International Organization for Standardization (ISO) and technical process metering insights via Lanry Instruments.
The Doppler flowmeter operates by continuously transmitting high-frequency ultrasonic waves into the pipe interior via an external transmitting transducer. The acoustic energy propagates through the pipe wall and liquid medium, reflecting off suspended solids or micro-bubbles traveling with the flow stream.
Because these sonic reflectors are moving within the sonic beam path, the reflected sound waves undergo a frequency shift—known scientifically as the Doppler Effect. This frequency shift is directly proportional to the linear flow velocity of the moving medium:
The integrated digital signal processor interprets this physical shift and converts it instantly into volumetric flow rate, linear velocity, and accumulated flow totalizers across user-selected units.
Why modern plants and industrial processes choose external ultrasonic Doppler systems
Transducers are clamp-on (DF6100-EC/EP) or hot-tapped insertion (DF6100-EI) types. Users never need to shut down the pipe flow, depressurize systems, or cut lines during installation.
Features excellent low flow rate sensitivity starting down at 0.05 m/s, reaching up to 12.0 m/s with a high-resolution measurement capability of 0.25 mm/s.
One transmitter model covers pipe sizes ranging from small industrial tubes at DN40 mm up to huge municipal water mains reaching DN4000 mm.
Standard aluminum sensors handle -35℃ to 85℃, while custom high-temperature PEEK sensors effortlessly operate across harsh conditions between -35℃ and 200℃.
Configured with standard 4-20mA analog output, programmable Relays, and high-frequency OCT totalizer pulse outputs for seamless SCADA and PLC interfacing.
Because sensors never contact abrasive mining slurries or corrosive raw sewage directly, transducer lifespan and physical integrity remain completely uncompromised.
Reliable flow velocity and totalization across challenging slurry environments
The non-contact measurement mechanism makes the DF6100-EC Wall-mounted Doppler Ultrasonic Flowmeter the gold standard for fluids loaded with suspended particulate matter:
For comprehensive guidelines on wastewater handling, refer to water safety resources on the United States Environmental Protection Agency (EPA) website.
Engineered to meet rigorous international industrial process control standards
| Principle | Doppler Ultrasonic Flowmeter |
|---|---|
| Resolution | 0.25 mm/s |
| Repeatability | 0.5% of reading |
| Accuracy | 0.5% - 2.0% F.S. (Calibrated span) |
| Response Time | 2 to 60 seconds (user selectable) |
| Velocity Range | 0.05 to 12.0 m/s |
| Liquid Reflectors | ≥100 ppm; min. 20% particles >100 micron |
| Power Supply | AC: 85-265V / DC: 24V/500mA (Solar optional) |
| Housing & Ingress | Fiberglass Wall-mount / IP66 (EN60529) |
| Display | 2×8 LCD, 8-digit flow rate, 8-digit totalizer |
| Totalized Units | Gallons, ft³, barrels, lbs, liters, m³, kg |
| Communication | 4-20mA, Relay, OCT output |
| Dimensions & Weight | 244 × 196 × 114 mm / 2.4 kg |
| Transducer Type | Clamp-on (Standard) or Insertion |
|---|---|
| Protection Class | IP65, IP67 or Submersible IP68 |
| Fluid Temperature | Std: -35℃ to 85℃ | High-Temp: -35℃ to 200℃ |
| Pipe Diameter Range | 40 mm to 4000 mm (DN40 - DN4000) |
| Transducer Material | Aluminum (Standard) / PEEK (High Temp) |
| Cable Length | Standard 10m (Extendable up to 300m) |
Model: DF6100-EC Wall-mounted Doppler Clamp-on Flowmeter
● Power Supply: A (110VAC), B (220VAC), D (24VDC), S (65W Solar)
● Outputs: 1 (4-20mA), 2 (Relay), 3 (OCT), N (None)
● Transducer Temp: S (-35~85℃), H (-35~200℃)
Example Code: DF6100-EC-B-1-N-D-S-DN100-10m
Proper acoustic coupling and straight pipe run criteria for maximum precision
When installing Doppler transducers, maintaining undisturbed laminar flow conditions is essential for acoustic accuracy:
1. Upstream Run: Requires at least 10D straight pipe length free of valves, tees, and reducers (where D is nominal pipe diameter).
2. Downstream Run: Requires at least 5D straight pipe distance prior to pipe bends or expansions.
3. Transducer Position: Mount sensors horizontally on 3 o'clock and 9 o'clock pipe positions to prevent acoustic scattering from sediment at the bottom or free air at the top.
Everything you need to know about Doppler ultrasonic instrumentation
Reviewed and validated by flow measurement instrumentation specialists
Principal Ultrasonic Instrumentation Engineer
Over 16 years of hands-on experience designing acoustic flowmeters, non-intrusive sensor arrays, and ultrasonic signal conditioning circuits for harsh mining and municipal water facilities.
Senior Process Automation & SCADA Specialist
Specializes in wastewater metering architecture, industrial telemetry protocols, and high-temperature Doppler flowmeter deployment across global chemical process industries.