Ultrasonic Flow Meters
Experience the SmartMeasurement advantage with our state-of-the-art ultrasonic flow meters. Engineered for excellence, our range covers permanent and portable clamp-on solutions, open channel systems, and water & energy meters.
Ideal for measuring liquid flow in industries like water management, oil and gas, HVAC, and industrial processing, our meters utilize transit-time or Doppler technology to ensure precision with both clean and particle-laden fluids.
Choose SmartMeasurement for cutting-edge meter solutions designed to optimize fluid measurement and streamline operations.
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Types of Ultrasonic Flow Meters
Provides precise, non-invasive flow measurement. Ideal for both permanent and temporary setups, ensuring accurate monitoring without disrupting flow. Commonly used in water management, HVAC systems, industrial audits, and maintenance checks.
Provides accurate flow measurement in open channels and partially filled pipes. Ideal for wastewater treatment, environmental monitoring, and irrigation systems.
Measures thermal energy flow in HVAC and cooling systems with high precision. Tracks heating and cooling energy usage for improved efficiency. Widely used in commercial buildings, industrial facilities, and energy management applications.
Why Choose SmartMeasurement?
High Accuracy
Achieve precise readings with advanced ultrasonic technology, even in challenging conditions.
Energy Efficient
Consumes minimal power while delivering reliable performance.
Low Maintenance
No moving parts design minimizes wear & tear, lowering maintenance costs.
Budget-Smart, Feature-Rich
Compared to legacy brands, we offer premium performance. at a mid-tier price.
Non-Invasive Measurement
Measure flow without disrupting the pipeline, reducing downtime and maintenance.
Built for Engineers, By Engineers
Utility Engineers
As a utility engineer, you can’t afford downtime. The Multi-Channel Transit Time Flow Meter is a transit-time clamp-on that installs in minutes with no pipe cutting and ±0.5% accuracy, perfect for high-flow city mains or retrofit projects. Since it is very difficult to know what is inside the pipe, the AlsonicDSP’s ability to measure up to 30% particles/bubbles gives confidence to utility engineers that they can measure any fluid, even particle ridden wastewater.
Process Engineers
Process engineers in pulp, food, or mining often face slurry-heavy flows. And those in chemical, power, or industrial settings demand precise measurements. Our transit time ultrasonic meter is the Alsonic DSP which can handle up to 30% or AlsonicDDPL Doppler Flow Meter which can handle up to 40% bubbles and particulates, giving you real-time readings where other meters fail.
Facility Managers and Commissioning Agents
Facility managers and commissioning agents who monitor city-wide water usage or effluent discharge love our Portable Multi-Channel Transit Time Meter. It’s a portable clamp-on ultrasonic meter in a rugged case, designed for quick setup on pipes from ¾” to 240”, logging flow data all day.
MEP Engineers
For MEP engineers calculating heating/cooling energy, SmartMeasurement’s Wall Mount BTU Flow Meter combines ultrasonic flow with dual PT100 RTDs for accurate ΔT. Fully BACnet/Modbus compatible, it drops right into your BAS.
Water Resource Managers and Agricultural Engineers
Water resource managers and agricultural engineers trust the Area Velocity Open Channel Meter. It combines velocity transducers and a level sensor to calculate flow in open or partially filled channels, even with sediment.
Property Managers and Mechanical Contractors
Property managers and mechanical contractors turn to our Transit Time Water Meter. NSF-61 certified, no moving parts, and accurate even at low flow. It’s built for long life in tight mechanical closets.
Power Plant Engineers
Power plant engineers needing extreme precision go with SmartMeasurement’s Multi-Channel Transit Time Flow Meter. The multiple acoustic paths and advanced DSP provides ±0.5% accuracy even with swirl and thermal layering.
OEM System Designers
OEM system designers that require compact sensors with customizable and interoperable capabilities often choose the Economical Transit-Time Meter: economical, small footprint, and still transit-time accurate. Inline or insertion options mean no space issues and no moving parts to foul.
Key Features
Precision-engineered for clean, dirty, or open-channel flows
Clamp-on, inline, portable, and Doppler variants
Broad pipe size support and wide flow range
Industry-leading accuracy and repeatability
Easier installation, lower maintenance, better pricing
Trusted in regulatory, industrial, and utility applications
How Ultrasonic Flow Meters Work
Transit-Time Measurement for Clean Fluids
At SmartMeasurement, our ultrasonic meters harness advanced acoustic technology to deliver precise, non-intrusive flow measurements. Using our proprietary transit-time method, dual transducers send high-frequency ultrasonic pulses both with and against the direction of fluid flow.
The resulting difference in transit times—captured by our state-of-the-art signal processing algorithms—translates directly into accurate fluid velocity and volumetric flow rate data, ensuring optimal performance in clean water and low-particulate applications.
Doppler Technology for Particle-Rich Environments
In addition, select SmartMeasurement models employ Doppler technology to tackle more challenging environments. In these systems, ultrasonic signals reflect off particles or bubbles within the fluid, generating a measurable frequency shift known as the Doppler shift.
Our cutting-edge electronics interpret this differential signal to provide reliable flow detection, even in particle-rich or bubbly conditions.
Applications of Ultrasonic Flow Meters
Our ultrasonic flow meters are engineered to excel across a diverse range of industries and applications — ensuring accurate flow monitoring in any environment.
Water Treatment & Municipal Systems
Perfect for measuring flow in city water supply or building HVAC systems. Clean liquid, no pipe cutting or downtime. Strap it on with commission in minutes. Get ±0.5 % accuracy in pipes up to 240 in.
Natural Gas or Air in HVAC or Utility Monitoring
For non-liquid applications like compressed air, CO₂, or natural gas pipelines, our transit-time models for gases use multiple path designs to compensate for turbulence, pressure, and low density.
OEM Skid or Chemical Dosing
Compact and affordable ultrasonic meters with a small footprint and still transit-time accurate. Inline or insertion options mean no space issues and no moving parts to foul.
Slurry or Wastewater in Industrial Processes
For flow of dirty, aerated, or slurry-laden water where transit-time fails, our Doppler transducers can handle the pulp fibers and air bubbles without fouling.
Energy Measurement in Chilled/Heated Water Loops
Designed for BTU metering in large buildings or district energy systems, our transit-time models for gases use multiple path designs to compensate for turbulence, pressure, and low density.
Case Study Snapshot: A municipal water treatment facility reduced downtime by 35% after switching to SmartMeasurement’s clamp-on ultrasonic flow meters with Doppler technology. The non-invasive design allowed for real-time monitoring of sediment-heavy flows without pipe modification or process interruption.
Featured Products
Explore a selection of our most popular ultrasonic flow meters, trusted across industries for accurate, non-intrusive measurement.
ALSONIC FX
- Size Range: ½"-48" (15-12000 mm) line sizes
- Temperature Range: -22~+230 °F (-30 ~ +110˚C)
- Accuracy: 1% - 2% of reading
- Applications: Water, factory automation, HVAC
- Starting At: $1,000
ALSONIC EG
- Size Range: Sizes 1-48" (25-1200 mm)
- Temperature Range: -22~+230 °F (-30 ~ +110˚C)
- Accuracy: 1% - 2%
- Applications: Water, clean liquids , chillers, HVAC, heat exchangers
- Starting At: $1,200
ALSONIC PL
- Size Range: 1"-48" (25-12000 mm) line sizes
- Temperature Range: -22~+230 °F ( -30 ~ +110˚C)
- Accuracy: 1-2% of reading
- Applications: Water, HVAC, MRO
- Starting At: $1,600
ALSONIC PLEG
- Size Range: 1-48" (25-1200 mm) line sizes
- Temperature Range: -22~+230 °F (-30 ~ +110˚C)
- Accuracy: 1% - 2%
- Applications: Portable energy/BTU meter for building automation, HVAC, chillers, heat exchangers
- Starting At: $2500
ALSONIC DSP
- Size Range: ¾"-240" (20-6000 mm) line sizes
- Temperature Range: -22~+248 °F (-30 ~ +120˚C)
- Accuracy: 0.5% - 1% of reading
- Applications: Oil & gas, water, wastewater, marine, power/utility
- Starting At: $3,000
Alsonic DSPPL
- Size Range: ¾"-240" (20-6000 mm) line sizes
- Temperature Range: -22~+248 °F (-30 ~ +120˚C)
- Accuracy: 0.5% - 1% of reading
- Applications: Oil & gas, water, wastewater, marine, power/utility
- Starting At: $6,000
ALSONIC MINI
- Size Range: ½"-2" (15-50 mm) line sizes
- Temperature Range: 32~+122 °F ( -0 ~ +50˚C)
- Accuracy: 2% of reading
- Applications: Chemical, DI-water, corrosive fluids
- Starting At: $500
ALSONIC MN2 (ALsonic-MINI 2)
- Size Range: (Std) 3/8"~1 ½ " (DN10~DN40), (Opt) 1/4" (DN8)
- Temperature Range: (Std) -10°C~65°C (Non-frozen), (Opt) -10°C~105°C (Non-frozen)
- Accuracy: (Std) 3%FS, (Opt) 1.5%FS
- Applications: Food & Beverage, Automotive, Chemical processing, and dosing/mixing applications
- Starting At: $900
ALSONIC BAEG
- Size Range: ½-12" (15-300mm) line sizes
- Temperature Range: 32-195 °F (0 ~ +90˚C)
- Accuracy: 1% - 2%
- Applications: BTU, sub-metering, building automation, HVAC, chillers
- Starting At: $200
Alsonic BAWM
- Size Range: Sizes ½"-12 (15-300mm) line sizes
- Temperature Range: -32-195 °F (0 ~ +90˚C)
- Accuracy: 1% - 2%
- Applications: Domestic water and building automation industires, replacing mechanical water meters
- Starting At: $2500
ALSONIC DDPL
- Size Range: (Std) ½" - 240" (15-6000 mm) line sizes
- Temperature Range: -22~+302 °F ( -30 ~ +150˚C)
- Accuracy: 2 - 5% of reading
- Applications: Wastewater, drilling mud, any portable application with high solids count
- Starting At: $3,000
ALSONIC-RAVM
- Size Range: Level 0-70 meters channel up to 100 meters
- Temperature Range: Seal proof dew and condensate <65C enclosure IP68 or IP67
- Accuracy: +/- 0.01m/s +/-1%
- Applications: Rivers, lakes, tides, reservoir gates, sewage pipe networks, irrigation channels, etc.
- Starting At: $6,000
ALSONIC-AVM
- Size Range: Sizes 3'-130' (1-40 m)
- Temperature Range: Ambient, transducers can withstand temperatures of 248°F (120°C)
- Accuracy: 0.5-1%
- Applications: Open channel; clean and dirty water
- Starting At: $8,000
ALSONIC-SAVM
- Size Range: Sizes 6''-48" (100-1200 m)
- Temperature Range: Ambient, transducers can withstand temperatures of 248°F (120°C)
- Accuracy: 0.5-1%
- Applications: Clean or dirty sewers
- Starting At: $8,000
ALSONIC-DAVM
- Size Range: Sizes 6"-240" (150-6000 mm)
- Temperature Range: Ambient, transducers can withstand temperatures of 248°F (120°C)
- Accuracy: 2-5%
- Applications: Economic open channel monitoring, mainly used for sewers and surveying
- Starting At: $5,000
Need help choosing the right meter for your system?
Featured Products
Explore a selection of our most popular ultrasonic flow meters, trusted across industries for accurate, non-intrusive measurement.
ALSONIC PL
- Size Range: 1"-48" (25-12000 mm) line sizes
- Temperature Range: -22~+230 °F ( -30 ~ +110˚C)
- Accuracy: 1-2% of reading
- Applications: Water, HVAC, MRO
- Starting At: $1,600
ALSONIC DDPL
- Size Range: (Std) ½" - 240" (15-6000 mm) line sizes
- Temperature Range: -22~+302 °F ( -30 ~ +150˚C)
- Accuracy: 2 - 5% of reading
- Applications: Wastewater, drilling mud, any portable application with high solids count
- Starting At: $3,000
ALSONIC MINI
- Size Range: ½"-2" (15-50 mm) line sizes
- Temperature Range: 32~+122 °F ( -0 ~ +50˚C)
- Accuracy: 2% of reading
- Applications: Chemical, DI-water, corrosive fluids
- Starting At: $500
ALSONIC EG
- Size Range: Sizes 1-48" (25-1200 mm)
- Temperature Range: -22~+230 °F (-30 ~ +110˚C)
- Accuracy: 1% - 2%
- Applications: Water, clean liquids , chillers, HVAC, heat exchangers
- Starting At: $1,200
ALSONIC PLEG
- Size Range: 1-48" (25-1200 mm) line sizes
- Temperature Range: -22~+230 °F (-30 ~ +110˚C)
- Accuracy: 1% - 2%
- Applications: Portable energy/BTU meter for building automation, HVAC, chillers, heat exchangers
- Starting At: $2500
Ultra Low-flow, Small Line Size
ALSONIC MN2 (ALsonic-MINI 2)
- Size Range: (Std) 3/8"~1 ½ " (DN10~DN40), (Opt) 1/4" (DN8)
- Temperature Range: (Std) -10°C~65°C (Non-frozen), (Opt) -10°C~105°C (Non-frozen)
- Accuracy: (Std) 3%FS, (Opt) 1.5%FS
- Applications: Food & Beverage, Automotive, Chemical processing, and dosing/mixing applications
ALSONIC FX
- Size Range: ½"-48" (15-12000 mm) line sizes
- Temperature Range: -22~+230 °F (-30 ~ +110˚C)
- Accuracy: 1% - 2% of reading
- Applications: Water, factory automation, HVAC
- Starting At: $1,000
ALSONIC EG
- Size Range: Sizes 1-48" (25-1200 mm)
- Temperature Range: -22~+230 °F (-30 ~ +110˚C)
- Accuracy: 1% - 2%
- Applications: Water, clean liquids , chillers, HVAC, heat exchangers
- Starting At: $1,200
ALSONIC DSP
- Size Range: ¾"-240" (20-6000 mm) line sizes
- Temperature Range: -22~+248 °F (-30 ~ +120˚C)
- Accuracy: 0.5% - 1% of reading
- Applications: Oil & gas, water, wastewater, marine, power/utility
- Starting At: $3,000
ALSONIC DDPL
- Size Range: ½" - 240" (15-6000 mm) line sizes
- Temperature Range: -22~+302 °F (-30 ~ +150˚C)
- Accuracy: 2% - 5% of reading
- Applications: Wastewater, drilling mud, any portable application with many particles
- Starting At: $3,000
ALSONIC-AVM
- Size Range: Sizes 3'-130' (1-40 m)
- Temperature Range: Ambient, transducers can withstand temperatures of 248°F (120°C)
- Accuracy: 0.5-1%
- Applications: Open channel; clean and dirty water
- Starting At: $8,000
ALSONIC-SAVM
- Size Range: Sizes 6''-48" (100-1200 m)
- Temperature Range: Ambient, transducers can withstand temperatures of 248°F (120°C)
- Accuracy: 0.5-1%
- Applications: Clean or dirty sewers
- Starting At: $8,000
ALSONIC-DAVM
- Size Range: Sizes 6"-240" (150-6000 mm)
- Temperature Range: Ambient, transducers can withstand temperatures of 248°F (120°C)
- Accuracy: 2-5%
- Applications: Economic open channel monitoring, mainly used for sewers and surveying
- Starting At: $5,000
ALSONIC-RAVM
- Size Range: Level 0-70 meters channel up to 100 meters
- Temperature Range: Seal proof dew and condensate <65C enclosure IP68 or IP67
- Accuracy: +/- 0.01m/s +/-1%
- Applications: Rivers, lakes, tides, reservoir gates, sewage pipe networks, irrigation channels, etc.
- Starting At: $6,000
ALSONIC BAEG
- Size Range: ½-12" (15-300mm) line sizes
- Temperature Range: 32-195 °F (0 ~ +90˚C)
- Accuracy: 1% - 2%
- Applications: BTU, sub-metering, building automation, HVAC, chillers
- Starting At: $200
SmartMeasurement Ultrasonic Flow Meters FAQ
Have questions about ultrasonic flow meters? Below are the most common inquiries our engineers receive. Click a question to reveal the answer
How does an ultrasonic flow meter work?
At SmartMeasurement, our ultrasonic flow meters use high-frequency ultrasonic pulses from dual transducers mounted on opposite sides of the pipe. The transit-time method measures the time difference of pulses traveling with and against the liquid flow, while Doppler models detect frequency shifts from gas bubbles or suspended particles. This method provides reliable flow measurement for both clean and aerated liquids.
What is the difference between an ultrasonic flow meter and an electromagnetic flow meter?
Electromagnetic flow meters rely on electrical conductivity to measure liquid flow and are limited to conductive fluids. In contrast, ultrasonic flow meters use ultrasonic waves, making them suitable for both conductive and non-conductive liquids, including applications in chemical processing and wastewater industries. Ultrasonic meters are a non-intrusive flow meter while magnetic meters are installed between pipes.
What are the disadvantages of an ultrasonic flow meter?
Ultrasonic flow meters may be less effective with dirty liquids or heavy fouling on the pipe wall, and they can struggle in highly turbulent flows or at very low liquid flow rates where ultrasonic signals become less distinct. However Smartmeasurement’s AlsonicDSP family of products having high frequency with its advanced algorithm are able to measure dirty liquids of up to 30% bubbles or particles. While the ability to average two independent flow paths, can mitigate the effect of turbulent flows..
How far away should an ultrasonic flow meter be mounted from the pipe?
SmartMeasurement’s clamp-on ultrasonic meters are designed for direct application on the pipe wall. The optimal transducer spacing depends on the pipe size and manufacturer’s installation guidelines, ensuring accurate flow measurement without modifying the internal liquid.
How far can ultrasonic signals detect in flow measurement?
The effective detection range of ultrasonic signals depends on pipe material, diameter, and fluid properties. Generally, these ultrasonic sensors work reliably across standard pipe sizes, ensuring accurate measurement of flow rate and average velocity in diverse industrial and commercial settings.
What is the difference between an ultrasonic flow meter and a rotameter?
Rotameters use a floating element in a tapered tube to measure flow, whereas ultrasonic flow meters use sound waves and ultrasonic pulses. This non-intrusive, solid state technology offers higher precision, lower maintenance, and direct measurement of average velocity.
Can an ultrasonic flow meter measure air flow?
While most ultrasonic meters are optimized for liquid flow measurement, specialized models are engineered to measure air flow. These units account for the lower density and unique acoustic properties of gases, ensuring accurate monitoring.
How accurate are SmartMeasurement’s ultrasonic flow meters?
SmartMeasurement’s ultrasonic sensors deliver high accuracy—often within a few percentage points—by measuring average velocity and volumetric flow through precise ultrasonic pulses. Rigorous factory calibration and routine verification ensure consistent performance in both residential and commercial applications.
Do ultrasonic flow meters require calibration?
Our devices come factory-calibrated for accurate liquid flow rate measurement and require minimal field calibration. Periodic checks are recommended for critical process control applications to maintain reliable performance over time.
Still have a technical question?
