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Dynasonic Flow Meter Selection Guide: How to Choose the Right Model
Quick Answer
Pick a Dynasonic flow meter based on pipe size, fluid type, and installation conditions. For clean water in DN15 to DN600 pipes, choose the Dynasonic UFA-100 clamp-on model. For dirty liquids or pipes above DN600, specify the Dynasonic UFB-200 insertion type. Send us your pipe diameter, fluid, temperature, and flow range for a direct model recommendation.
What You Must Know Before Selecting a Dynasonic Flow Meter
Dynasonic ultrasonic flow meters measure flow from outside the pipe or with minimal pipe intrusion. They handle clean water, seawater, chemicals, and some wastewater streams. The selection process starts with four data points. Pipe size. Fluid type. Temperature range. Flow velocity.
We sell Dynasonic flow meters to water treatment plants in Vietnam, chemical distributors in Mexico, and food processors in Australia. Most selection mistakes come from missing one simple detail. Pipe material. Dynasonic models do not perform well on lined pipes, heavily corroded steel, or concrete pipes without proper transducer setup.
Key Selection Factors for Dynasonic Models
Pipe Size and Transducer Type
The first decision is transducer mounting. Clamp-on transducers work well from DN15 to DN600. They mount outside the pipe wall. No pipe cutting. No process shutdown. In practice, water utilities in the Philippines use clamp-on models for quick flow audits on existing lines.
Insertion transducers suit pipes from DN50 to DN3000. You weld a fitting onto the pipe and insert the probe into the flow stream. Better signal strength on large pipes. More stable readings on low flow. A desalination plant in Oman replaced four mechanical meters with Dynasonic insertion units on DN800 brine lines last year. The readings stayed stable for 14 months without recalibration.
Fluid Type and Cleanliness
Ultrasonic signals degrade in fluids with high solids content or entrained gas. The Dynasonic UFA-100 clamp-on model handles clean water, RO permeate, cooling water, and light chemicals with less than 2 percent suspended solids. For raw sewage, sludge, or slurries, choose a different technology. Electromagnetic flow meters handle those applications better.
Here is the thing. Some customers try to use clamp-on ultrasonic meters on raw wastewater with gas bubbles. The signal drops. The reading freezes. We have seen this on customer sites in Indonesia and Brazil. If your fluid contains gas bubbles above 3 percent by volume, tell us before ordering. We will recommend a different meter type or specify a special installation point below a pump where gas is compressed.
Temperature and Pressure Limits
Standard Dynasonic transducers operate from -20°C to 120°C. High temperature models extend to 200°C. Pressure ratings depend on the transducer mounting. Clamp-on transducers see no process pressure because they sit outside the pipe. Insertion transducers handle up to 40 bar on standard fittings. Specify higher pressure fittings if needed.
A chemical plant in Thailand asked us about measuring hot water at 150°C in a DN100 pipe. We supplied the Dynasonic UFA-200 with high temperature clamp-on transducers. No pipe penetration. No pressure rating concern. Total cost was lower than an inline meter with the same accuracy.
Flow Range and Accuracy Needs
Dynasonic clamp-on meters deliver 1.0 percent accuracy under ideal conditions. Insertion models achieve 0.5 percent with proper straight pipe runs. Flow velocity range is 0.01 to 12 m/s for most models. For custody transfer or billing, verify local regulations. Some jurisdictions require 0.5 percent accuracy or better. In those cases, a Coriolis mass flow meter may be the safer choice.
Straight pipe requirements matter. Install the transducer at least 10 pipe diameters downstream from any elbow, valve, or pump. For example, a DN200 pipe needs 2 meters of straight run before the measurement point. Most engineers skip this part during planning. Then they ask why readings jump around after installation.
Dynasonic Model Comparison
Dynasonic UFA-100 Clamp-On Flow Meter
Best for clean liquids in DN15 to DN600 pipes. No process shutdown needed. Installation takes under one hour for a trained technician. Output options include 4-20 mA, pulse, and RS485 Modbus. Accuracy is 1.0 percent. Price point suits water distribution, HVAC chilled water, and light chemical transfer applications.
Dynasonic UFB-200 Insertion Flow Meter
Best for large pipes from DN50 to DN3000. Hot tap installation possible under pressure. Accuracy reaches 0.5 percent with proper installation. Dual channel version improves accuracy on non-ideal flow profiles. Suitable for seawater, wastewater effluent, and cooling water in power plants.
Dynasonic UFC-300 Portable Flow Meter
Battery powered clamp-on unit for flow surveys and meter verification. Engineers in Australia use this model to check existing flow meter performa
Application Examples and Recommended Models
Desalination plant seawater intake line. DN900 carbon steel pipe. Seawater at 25°C to 35°C. Flow range 800 to 2500 m3/h. Recommended model: Dynasonic UFB-200 insertion with 316L stainless steel transducer. Dual channel configuration for flow profile correction.
Pharmaceutical water for injection loop. DN25 stainless steel pipe. Purified water at 80°C. Flow range 200 to 800 L/h. Recommended model: Dynasonic UFA-100 clamp-on with high temperature transducers. No product contact. No contamination risk.
Cooling tower water in a food processing plant. DN300 schedule 40 steel pipe. Treated water at 15°C to 30°C. Flow range 100 to 400 m3/h. Recommended model: Dynasonic UFA-100 clamp-on. Installation completed during normal plant operation. No downtime.
Installation Tips That Affect Model Choice
Pipe surface condition affects clamp-on accuracy. Remove paint, rust, and scale before mounting transducers. Use ultrasonic coupling gel. For permanent installations, replace gel with coupling pads rated for continuous service. One customer in Malaysia skipped surface preparation. The signal strength was 30 percent lower than expected. We sent a technician to fix it. The meter worked fine after proper cleaning.
Vertical pipes are easier than horizontal pipes for ultrasonic measurement. Flow in vertical pipes is typically full and evenly distributed. Horizontal pipes may have air pockets at the top. Install transducers on the side of horizontal pipes, not the top. This simple rule prevents most installation errors.
Output and Communication Options
All Dynasonic models offer standard 4-20 mA output for connection to PLC or SCADA systems. RS485 Modbus RTU comes standard on UFA-100 and UFB-200 models. Optional HART protocol is available for plants that use HART asset management systems. Pulse output suits batch control and totalizing applications.
A water utility in Chile needed Modbus communication to their existing SCADA. We configured the Dynasonic UFA-100 with RS485 Modbus output. The integration took one afternoon. They now monitor flow rates from 12 pump stations remotely.
Pricing and Lead Time
Dynasonic UFA-100 clamp-on flow meters start at 680 USD for DN15 to DN100 pipe sizes. Larger pipe sizes up to DN600 cost more due to larger transducers. The UFB-200 insertion model starts at 1200 USD depending on pipe size and transducer length. Portable UFC-300 units start at 1800 USD with hard case and charger included.
Lead time is 5 to 10 working days for standard models. Custom transducer lengths or special fittings add 5 to 10 days. We ship from Nanjing, China to Southeast Asia, Australia, Latin America, Africa, and the Middle East by DHL or FedEx. Sea freight saves cost on bulk orders over 20 units.
FAQ
Can Dynasonic flow meters measure diesel or fuel oil?
No. Ultrasonic flow meters need liquids with good acoustic transmission. Diesel and fuel oil absorb ultrasonic signals too strongly. Use an oval gear flow meter for diesel measurement. Our oval gear flow meters deliver 0.5 percent accuracy on diesel, fuel oil, and lubricants.
Do Dynasonic clamp-on meters work on plastic pipes?
Yes but with limits. PVC and HDPE pipes work well up to DN200. The pipe wall must be solid without air pockets or voids. Thin wall plastic pipes below 3 mm wall thickness are difficult. Contact us with your exact pipe specification before ordering.
What is the minimum conductivity requirement for Dynasonic meters?
None. Unlike electromagnetic flow meters that need 5 µS/cm minimum conductivity, ultrasonic meters work on non-conductive liquids. Deionized water, RO permeate, and glycol mixtures are all measurable.
Can one Dynasonic unit measure two different pipe sizes?
No. Each transducer set is matched to a specific pipe diameter range. The UFA-100 covers a size range like DN50 to DN100 per transducer set. Different pipe sizes need different transducer sets. The portable UFC-300 model includes three transducer sets covering DN15 to DN600 in one kit.
How often do Dynasonic flow meters need recalibration?
Factory calibration is valid for 2 years under normal operating conditions. Drift is minimal for ultrasonic meters because there are no moving parts. Customers with ISO 9001 certification typically recalibrate annually. We offer factory recalibration service. Turnaround time is 5 working days plus shipping.
How to Get a Specific Recommendation
Send us four things. Your pipe size in DN. Your fluid type and temperature in degrees Celsius. Your flow range in m3/h or L/h. Your output requirement like 4-20 mA, pulse, or Modbus. We reply within 24 hours with a specific Dynasonic model, price, and lead time.
Contact Silver Automation Instruments at Tel: +86-25-68650347. WhatsApp: +86-25-52155837. WeC