Doppler Ultrasonic Flow Meters
ALSONIC DDPL
The ALSONIC DDPL provides accurate, non-invasive flow measurement for challenging fluids. No downtime, no pipe cutting, just clamp and go.
Size Range: (Std) ½” – 240″
Temperature Range: -22~+302 °F
Accuracy: 2 – 5% of reading
Starting At: $3,000
Why Choose SmartMeasurement’s Doppler Flow Meters?
No Pipe Cutting
Clamp-on design means no pipe penetration, no shutdowns. Just simple, fast installation that saves time and reduces labor costs.
Dirty Fluid Compatibility
Ideal for liquids with bubbles, solids, or sludge. Our meters deliver accurate readings in challenging flow conditions.
Low Maintenance
Non-contact, wear-free design minimizes maintenance needs and ensures dependable performance in harsh industrial environments.
Key Features
- Non-fouling transducer is immune to build-ups of grease, paraffin and other coating materials
- Clamp-on, non-invasive sensors measure flow through the pipe wall using ultrasonic waves — ideal for dirty liquids, aerated fluids, and suspended solids
- Solid-state design ensures maintenance-free operation with no moving parts, no calibration, and reliable performance
- Supports a wide range of pipe sizes and operates accurately across varying fluid characteristics, including viscous liquids, particulates, and gas-liquid mixes
- Minimal straight-run requirements and simple wall-mounted installation reduce setup time and allow use in tight spaces
- Built-in data logger, alphanumeric keypad, and backlit display includes date, totalizer, and signal condition
- Includes industry-standard outputs for integration with control systems and data monitoring platforms
Technical Specifications
| Measuring Principle: | Doppler frequency shift |
| Pipe Sizes: | (Std) 1 ~ 120 inches (25 ~ 3050 mm): (Opt) 0.25 ~ 1 inch (6 ~ 25 mm) |
| Temperature: | (Std) -40° ~ 180°F (-40° ~ 82°C): Opt) -40° ~ 300°F (-40° ~ 150°C) |
| Fluid Velocity: | Clamp on, 1 ~ 20 FPS (0.3 ~ 6.08 MPS); Insertion: 0.5 ~ 20 FPS (0.15 ~ 6.08 MPS) |
| Accuracy: | ±2% Full Scale |
| Repeatability: | ±0.4% of Full Scale |
| Engineering Units: | FPS, GPM, MGD (MPS, LPM, m3/hr) |
| Minimum particulates: | 4 ½ digit |
| Resolution: | 0.4% of Full Scale |
| Response Time: | 5 ~ 50 seconds, user configured, to 90% of value |
| Display: | 2 line x 20 character alphanumeric LCD; (backlit), 6 digit – flow rate, 6 digit – total flow |
| Indicators: | Power, signal strength, diagnostic codes, over-range, read, low battery, charge |
| Protection -Converter: | NEMA 4/IP-65 (IP-67) ABS |
| Transducers: | IP68 (Submersible) |
| Max. Cable Length: | 6m, flexible armored conduit, Up to 100m |
| Power Consumption: | less than 12VA |
| Power Supply: | Wall-mount: 115/230 VAC 50/60 Hz ±10% and 12VDC; Portable: Internal lead acid gel cell battery provides; up to 8 hrs of continuous operation; Hand-Held: Up to 14 hours |
| Outputs: | Wall-mount: 4-20 mA, pulse, RS232, RS485; Portable:4-20 mA, 600 Ω max, isolated. |
| Data logger: | 4.0M bytes data logger up to 200,000 records |
| Approval | CE |
Set-Up Installation & Maintenance
Installation Process
Installing our Doppler ultrasonic flow meter is quick and non-intrusive — perfect for systems where downtime isn’t an option. Simply clamp the sensor onto the outside of the pipe using the provided brackets, apply acoustic coupling gel to ensure proper signal transmission, and align according to the guide. No cutting or pipe modification is required, making it ideal for retrofit projects or temporary setups across various pipe materials and diameters.
Calibration and Maintenance
SmartMeasurement’s Doppler flow meters are engineered for minimal maintenance and long-term reliability. Initial calibration can be done through the onboard interface or remotely via software, with built-in diagnostics to guide you through setup and accuracy checks. Periodic recalibration is recommended based on application demands, but our system’s robust design and self-monitoring features reduce the need for routine upkeep and keep operations flowing without interruption.
What is a Doppler Ultrasonic Flow Meter?
A Doppler ultrasonic flow meter is designed to measure the flow of liquids that contain particles or bubbles — think slurries, wastewater, or aerated fluids. It works by sending ultrasonic signals through the pipe and picking up echoes from moving particles, ideal for tough environments. Since it clamps onto the outside of the pipe, there’s no need to cut into systems or stop the flow. It’s a hassle-free, reliable solution for industries that need accurate measurements without downtime.
How Doppler Technology Works
Doppler ultrasonic flow meters measure the velocity of fluid by bouncing sound waves off particles or bubbles in a liquid. These tiny reflectors cause a change in frequency — known as the Doppler effect — which is used to calculate flow velocity. This method works best in imperfectly clean liquids like wastewater, slurries, or chemical mixtures.
Unlike transit-time meters, which need clean fluids, Doppler meters handle noise in the flow — like air or solids — to get accurate readings. That’s why they’re ideal for harsh industrial environments like wastewater treatment, chemical processing, and oil and gas — where fast, accurate, and non-intrusive flow measurement really matters.
Doppler Flow Meter Applications
Wastewater Treatment
At SmartMeasurement, our Doppler flow meters are built to handle the dirty, gritty reality of wastewater treatment. Whether it’s sludge, aerated liquids, or flows filled with suspended solids, our non-intrusive meters deliver reliable readings without ever touching the fluid — ideal for mixed liquor, RAS lines, and more.
Chemical Processing
Chemical processing environments demand precision and safety. Our Doppler flow meters provide both. By measuring through the pipe wall, we keep sensors protected from corrosive fluids while still delivering accurate, real-time flow data for slurries, acids, and particulate-heavy liquids — all without interrupting your process.
Industrial Oil and Gas
SmartMeasurement’s Doppler flow meters are trusted in the oil and gas industry for their rugged performance and easy installation. Whether you’re monitoring crude oil with sand, multiphase fluids, or entrained gas, our clamp-on technology ensures fast, safe, and accurate measurement with no pipe cutting or shutdown required.
Heating, Ventilation and Air Conditioning (HVAC) Systems
HVAC professionals trust SmartMeasurement Doppler meters to monitor chilled water loops, glycol mixtures, and other energy transfer fluids that contain air bubbles or particulates. Our clamp-on technology allows for quick installation without shutting down systems, making flow tracking simple during energy audits, maintenance, or system balancing.
Doppler Ultrasonic Flow Meter FAQs
Have questions about doppler ultrasonic flow meters? Below are the most common inquiries our engineers receive. Click a question to reveal the answer
What is the difference between an ultrasonic flow meter and a rotameter?
An ultrasonic flow meter measures flow using sound waves and is ideal for closed, pressurized systems. While a rotameter is a mechanical device that relies on gravity and is better suited for low-pressure, clean fluids in vertical open systems.
What does a Doppler ultrasonic flow meter measure?
Doppler ultrasonic flow meters measure how fast a fluid is moving by tracking sound waves that bounce off particles or bubbles in the flow. SmartMeasurement’s Doppler meters turn those reflections into accurate flow readings, making them a smart choice for dirty, aerated, or hard-to-measure liquids.
Are Doppler flow meters accurate?
Yes, Doppler flow meters deliver accurate results when measuring fluids with bubbles or suspended solids. At SmartMeasurement, our Doppler meters use advanced signal tech to deliver solid, repeatable results. Because they clamp on from the outside, there’s no disruption to your system—just reliable flow data with less hassle and maintenance.
