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The Ultrasonic Water Meter DN250 DN500 represents the pinnacle of large-diameter flow measurement technology, engineered to meet the demands of municipal water distribution networks, industrial facilities, and large-scale infrastructure projects. Designed for pipelines with nominal diameters ranging from 250mm to 500mm, these ultrasonic meters utilize advanced transit-time technology to deliver precise measurement without mechanical moving parts, eliminating wear and ensuring long-term reliability. Compliant with international accuracy standards, the meter achieves ±2% error tolerance in high-flow regions (Q2 to Q4) and ±5% in low-flow regions (Q1 to Q2), making it suitable for monitoring large-volume water distribution. With a maximum working pressure of 1.0 MPa (with options for PN16 and PN25 configurations), the meter safely handles the high-pressure conditions common in municipal and industrial pipelines. Its robust construction and low-pressure loss design (△p ＜ 0.063 MPa) minimize energy consumption while providing critical data for water resource management and billing.
Optimized for large-scale applications, the DN250 model supports a maximum flow rate of 630 m³/h, while the DN500 model handles up to 2500 m³/h, making them suitable for municipal water mains, industrial water supply, and large irrigation systems. The wide flow range (Q3/Q1 ratio) ensures accurate measurement across varying demand conditions.
Built with a rugged cast iron housing and internal components resistant to corrosion and water impurities, the meter withstands harsh operating environments. The absence of moving parts eliminates mechanical wear, significantly extending service life compared to traditional mechanical water meters for large diameters.
Employing dual ultrasonic transducers with multi-path measurement technology, the meter compensates for flow profile variations within the pipe, ensuring measurement accuracy even in complex flow conditions. This technology eliminates the need for long straight pipe sections, providing flexibility in installation locations.
The meter features built-in diagnostics that monitor battery voltage, pipe fill status, and transducer performance. Alerts are generated for under-voltage conditions, empty pipe situations, and transducer malfunctions, enabling proactive maintenance and minimizing downtime.
Equipped with an M-BUS communication interface operating at 2400 bps, the meter seamlessly integrates into SCADA systems and remote monitoring networks. This allows for real-time data collection, remote configuration, and integration with water management software for analytics and reporting.
Installed in city water mains and district metering areas (DMAs), these meters provide utilities with accurate data on network performance, enabling leak detection, pressure management, and efficient resource allocation across large distribution zones.
Heavy industries such as power generation, chemical processing, and manufacturing utilize the DN250-DN500 meters to monitor large-volume water intake for production processes, cooling systems, and facility operations, ensuring accurate cost allocation and resource optimization.
The meters accurately measure inflow and outflow volumes at treatment facilities, providing critical data for process control, regulatory compliance reporting, and optimization of treatment processes.
Large-scale irrigation projects, including central pivot systems and canal networks, use these meters to monitor water distribution across agricultural lands, supporting efficient water usage and compliance with irrigation rights and regulations.
In inter-city water transfer projects and regional water supply networks, the meters provide precise measurement of water quantities being transported, ensuring fair allocation between supplying and receiving utilities.
While the meter's multi-path technology reduces dependency on long straight pipe runs, optimal accuracy is achieved with a minimum of 10D upstream and 5D downstream straight pipe sections (where D is the nominal diameter). This ensures stable flow profiles through the measurement section.
The non-intrusive ultrasonic measurement method is not affected by suspended particles or sediments in the water. Unlike mechanical meters that can suffer from wear or clogging, the ultrasonic transducers maintain accuracy even in water with moderate impurity levels.
Under normal operating conditions and with proper maintenance, the meter has an expected service life of 15+ years. The lithium battery powering the electronic components is designed to last 6+ years before replacement is required.
Technical Specifications
Performance | Parameters |
Accuracy class | Class 2 |
Nominal diameter | DN250~DN500 |
Liquid | Water, sewage and uniform fluids |
Range Ratio | R500 |
Max.working pressure and pressure loss | 1.6MPa/ Δp16 |
Working enviroment | Temperature：-25℃~70℃；Humidity≤100% |
Temperature Class | T30, T50 |
Flow profile sensitivity | U0/D0 |
Climatic ambient conditions | O |
Electormagnetic Class | E2 |
Output | RS485 (Modbus), OCT Pluse, 4-20mA(optional) |
Data storage | Auto-records cumulative flow data for the last 24 month |
Power supply | DC3.6V Lithium Battery（Supports 7V-24V DC input） |
Battery life | 12years（The communication frequency is once per hour through the modbus communication interface） |
Protection class | IP68 |
Flow Data
Nominal diameterDN (mm) | Q4 (m³/h) | Q3 (m³/h) | Q2 (m³/h) | Q1 (m³/h) |
250 | 787.5 | 630 | 2.016 | 1.26 |
300 | 1250 | 1000 | 3.2 | 2 |
350 | 2000 | 1600 | 5.12 | 3.2 |
400 | 3125 | 2500 | 8 | 5 |
450 | 3125 | 2500 | 8 | 5 |
500 | 5000 | 4000 | 12.8 | 8 |
Produt Size
Nominal diameter DN (mm) | DN50 | DN65 | DN80 | DN100 | DN125 | DN150 | DN200 |
L (mm) | 200 | 200 | 225 | 250 | 250 | 300 | 350 |
W (mm) | 165 | 185 | 200 | 220 | 250 | 285 | 340 |
H (mm) | 300 | 305 | 315 | 335 | 355 | 385 | 440 |
K (mm) | 125 | 145 | 160 | 180 | 210 | 240 | 295 |
Installation Diagram
The Ultrasonic Water Meter DN250 DN500 represents the pinnacle of large-diameter flow measurement technology, engineered to meet the demands of municipal water distribution networks, industrial facilities, and large-scale infrastructure projects. Designed for pipelines with nominal diameters ranging from 250mm to 500mm, these ultrasonic meters utilize advanced transit-time technology to deliver precise measurement without mechanical moving parts, eliminating wear and ensuring long-term reliability. Compliant with international accuracy standards, the meter achieves ±2% error tolerance in high-flow regions (Q2 to Q4) and ±5% in low-flow regions (Q1 to Q2), making it suitable for monitoring large-volume water distribution. With a maximum working pressure of 1.0 MPa (with options for PN16 and PN25 configurations), the meter safely handles the high-pressure conditions common in municipal and industrial pipelines. Its robust construction and low-pressure loss design (△p ＜ 0.063 MPa) minimize energy consumption while providing critical data for water resource management and billing.
Optimized for large-scale applications, the DN250 model supports a maximum flow rate of 630 m³/h, while the DN500 model handles up to 2500 m³/h, making them suitable for municipal water mains, industrial water supply, and large irrigation systems. The wide flow range (Q3/Q1 ratio) ensures accurate measurement across varying demand conditions.
Built with a rugged cast iron housing and internal components resistant to corrosion and water impurities, the meter withstands harsh operating environments. The absence of moving parts eliminates mechanical wear, significantly extending service life compared to traditional mechanical water meters for large diameters.
Employing dual ultrasonic transducers with multi-path measurement technology, the meter compensates for flow profile variations within the pipe, ensuring measurement accuracy even in complex flow conditions. This technology eliminates the need for long straight pipe sections, providing flexibility in installation locations.
The meter features built-in diagnostics that monitor battery voltage, pipe fill status, and transducer performance. Alerts are generated for under-voltage conditions, empty pipe situations, and transducer malfunctions, enabling proactive maintenance and minimizing downtime.
Equipped with an M-BUS communication interface operating at 2400 bps, the meter seamlessly integrates into SCADA systems and remote monitoring networks. This allows for real-time data collection, remote configuration, and integration with water management software for analytics and reporting.
Installed in city water mains and district metering areas (DMAs), these meters provide utilities with accurate data on network performance, enabling leak detection, pressure management, and efficient resource allocation across large distribution zones.
Heavy industries such as power generation, chemical processing, and manufacturing utilize the DN250-DN500 meters to monitor large-volume water intake for production processes, cooling systems, and facility operations, ensuring accurate cost allocation and resource optimization.
The meters accurately measure inflow and outflow volumes at treatment facilities, providing critical data for process control, regulatory compliance reporting, and optimization of treatment processes.
Large-scale irrigation projects, including central pivot systems and canal networks, use these meters to monitor water distribution across agricultural lands, supporting efficient water usage and compliance with irrigation rights and regulations.
In inter-city water transfer projects and regional water supply networks, the meters provide precise measurement of water quantities being transported, ensuring fair allocation between supplying and receiving utilities.
While the meter's multi-path technology reduces dependency on long straight pipe runs, optimal accuracy is achieved with a minimum of 10D upstream and 5D downstream straight pipe sections (where D is the nominal diameter). This ensures stable flow profiles through the measurement section.
The non-intrusive ultrasonic measurement method is not affected by suspended particles or sediments in the water. Unlike mechanical meters that can suffer from wear or clogging, the ultrasonic transducers maintain accuracy even in water with moderate impurity levels.
Under normal operating conditions and with proper maintenance, the meter has an expected service life of 15+ years. The lithium battery powering the electronic components is designed to last 6+ years before replacement is required.
Technical Specifications
Performance | Parameters |
Accuracy class | Class 2 |
Nominal diameter | DN250~DN500 |
Liquid | Water, sewage and uniform fluids |
Range Ratio | R500 |
Max.working pressure and pressure loss | 1.6MPa/ Δp16 |
Working enviroment | Temperature：-25℃~70℃；Humidity≤100% |
Temperature Class | T30, T50 |
Flow profile sensitivity | U0/D0 |
Climatic ambient conditions | O |
Electormagnetic Class | E2 |
Output | RS485 (Modbus), OCT Pluse, 4-20mA(optional) |
Data storage | Auto-records cumulative flow data for the last 24 month |
Power supply | DC3.6V Lithium Battery（Supports 7V-24V DC input） |
Battery life | 12years（The communication frequency is once per hour through the modbus communication interface） |
Protection class | IP68 |
Flow Data
Nominal diameterDN (mm) | Q4 (m³/h) | Q3 (m³/h) | Q2 (m³/h) | Q1 (m³/h) |
250 | 787.5 | 630 | 2.016 | 1.26 |
300 | 1250 | 1000 | 3.2 | 2 |
350 | 2000 | 1600 | 5.12 | 3.2 |
400 | 3125 | 2500 | 8 | 5 |
450 | 3125 | 2500 | 8 | 5 |
500 | 5000 | 4000 | 12.8 | 8 |
Produt Size
Nominal diameter DN (mm) | DN50 | DN65 | DN80 | DN100 | DN125 | DN150 | DN200 |
L (mm) | 200 | 200 | 225 | 250 | 250 | 300 | 350 |
W (mm) | 165 | 185 | 200 | 220 | 250 | 285 | 340 |
H (mm) | 300 | 305 | 315 | 335 | 355 | 385 | 440 |
K (mm) | 125 | 145 | 160 | 180 | 210 | 240 | 295 |
Installation Diagram
