Model No ::
BT-OCUFM
Open channel ultrasonic flow meters are sophisticated instruments designed to measure the flow of liquids in non-pressurized environments. These meters play an essential role in various industries, including water treatment, agriculture, and civil engineering. Understanding their working principle is crucial for effective application.
An Open Channel Ultrasonic Flow Meter is a non-contact, high-precision instrument designed to measure the flow of liquids in open channels such as rivers, canals, flumes, and partially filled pipes. It operates by transmitting ultrasonic pulses towards the surface of the liquid and calculating the flow rate based on the measured level, using pre-programmed channel dimensions and flow equations.
Secondly, With no moving parts and minimal maintenance requirements, it ensures reliable performance even in harsh or corrosive environments. Key features typically include automatic temperature compensation, built-in data logging, multiple output options (4-20mA, RS485), and easy integration with SCADA systems. Its non-intrusive design, low installation cost, and ability to provide continuous, real-time flow data make the Open Channel Ultrasonic Flow Meter a smart solution for accurate and efficient open channel flow monitoring.
The Principle Behind open channel flow meter
The working principle of open channel ultrasonic flow meters basically relies on the use of ultrasound technology. These meters utilize ultrasonic signals that travel through the air and are reflected from the surface of the flowing liquid. The time taken for these signals to return is measured and analyzed to determine the flow rate.
The flow meter typically includes a pair of ultrasonic transducers positioned above the channel. Each transducer alternately emits and receives sound waves. As the flow rate of the liquid increases, the distance and time taken by the sound waves change, allowing for accurate flow measurement.
Specification ::
| Measuring Range | 1 L / S ~ 99999.99 M / h |
| Cumulative Flow Maximum | 4290000000.00 m³ |
| Liquid Level Measuring Range | 5m/ 8m |
| Accuracy of Liquid Level Measurement | 0.25%〜0.50% |
| Display | LCD |
| Resolution | ±3mm or 0.1%(which is greater) |
| determined according to different weirs. | all weirs suitable |
| Power Supply | 18〜28VDC |
| Output | 4-wire 4 〜 20mA / 500 Ω load, RS485, MODBUS protocol |
| Accuracy | Depends on weir type |
| Process temperature | -20〜+80℃ |
| Working Environment Humidity | ≤ 90% RH, |
| Protection Leve | Transmitter IP66, sensor IP68 |
| Sensor Material | Anticorrosive ABS Plastic |
| Enclosure | Die-cast Aluminum |
For more detail please contact company or download catalogue,
Features :: open channel flow meter
Non-Contact Measurement
Measures flow without touching the liquid, reducing wear and maintenance.
High Accuracy & Repeatability
Provides precise level and flow measurements, typically ±1–2% accuracy depending on installation and conditions.
Compatible with Various Channel Types
Works with weirs, flumes (e.g., Parshall, Venturi), and custom open channels.
Automatic Flow Calculation
Converts level data to flow using built-in hydraulic formulas for different channel shapes.
Customizable Measurement Range
Available in various transducer ranges to suit channel depth and site conditions.
Temperature Compensation
Integrated temperature sensor ensures accuracy across varying environmental conditions.
Low Maintenance
No moving parts reduce downtime and service frequency.
Data Logging & Storage
Built-in memory or SD card for historical data logging and trend analysis.
Easy Installation & Configuration
Wall-mounted or field-mounted options with user-friendly menus for setup.
SCADA & PLC Integration
Seamless communication with control systems for real-time monitoring and automation.
Multiple Output Options
Offers 4–20 mA analog output, RS485/Modbus, relay alarms, and pulse outputs for flexible integration.
Applications
Wastewater Treatment Plants
Monitoring influent and effluent flow
Flow measurement in open channels, weirs, and flumes
Irrigation & Agriculture
Measuring flow in irrigation canals and distribution channels
Ensuring optimal water usage and distribution efficiency
Storm water & Drainage Systems
Monitoring runoff and storm water discharge
Urban flood control and water quality management
Environmental Monitoring
Flow measurement in rivers, streams, and natural watercourses
Hydrological studies and ecosystem management
Industrial Effluent Monitoring
Compliance with environmental regulations for wastewater discharge
Flow control in chemical plants, refineries, and food processing industries
Municipal Water Distribution
Open channel flow measurement in water treatment or distribution infrastructure
Hydropower Stations
Measuring incoming water flow to turbines for operational optimization
Mining & Slurry Applications
Flow measurement in open troughs for water and slurry transport
