What Is an Ultrasonic Flow Meter and Why Choose the ESEGAS LEUF-200?

What Is an Ultrasonic Flow Meter and Why Choose the ESEGAS LEUF-200?

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Sharon Ye

Technical Sales - Energy & Environment

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In industrial processes, accurately monitoring gas flow is essential. Yet, traditional flow meters often suffer from low precision, complicated installation, and high maintenance costs. These challenges can lead to compliance issues, wasted energy, and even penalties due to environmental regulations. The solution lies in the ESEGAS LEUF-200 Ultrasonic Flow Meter, a device engineered for high accuracy, reliability, and seamless integration into modern control systems.

The ESEGAS LEUF-200 Ultrasonic Flow Meter is a high-precision instrument designed specifically for flue gas measurement. Using transit-time ultrasonic technology, it delivers accurate standard volume flow outputs, supports wide velocity ranges, and withstands harsh industrial conditions. Its robust design and intelligent communication interfaces make it ideal for emission monitoring and process control across industries.

Now that we understand the basic definition of the Ultrasonic Flow Meter, let’s explore how the LEUF-200 works, its technical advantages, and its applications in industries such as energy, chemical processing, and environmental monitoring.


Many companies hesitate to adopt new flow meters due to concerns about installation interruptions and system downtime. The ESEGAS LEUF-200 resolves these worries by offering a non-intrusive Ultrasonic Flow Meter solution.

The meter operates on the transit-time principle, using two ultrasonic probes mounted on the side of the flue or duct. By measuring the difference in ultrasonic pulse travel time between upstream and downstream directions, the system calculates flow velocity. Combined with input values for temperature and pressure, the meter provides accurate gas flow measurements in standard conditions.


Traditional gas measurement devices can struggle with accuracy at low velocities or in fluctuating environments. This is where the ESEGAS Ultrasonic Flow Meter excels.

  • Velocity Range: 0–40 m/s
  • Accuracy: ±0.1 m/s
  • Repeatability: ±1% (≥2 m/s) or ±0.02 m/s (<2 m/s)
  • Response Time (T90): 30–300 seconds
  • Pipe Size Adaptability: Suitable for ducts 0.7–8 m in diameter
  • Durability: Operates reliably in –20 °C to +150 °C environments
  • Material: SS316L housing with IP65 protection

These features ensure that even under harsh conditions, the LEUF-200 maintains consistent and reliable performance, minimizing downtime and ensuring compliance.


Many legacy meters lack modern connectivity, limiting their usefulness in digital factories. The LEUF-200 addresses this with intelligent monitoring capabilities.

This Ultrasonic Flow Meter provides standard 4–20 mA analog output for process control integration, while optional RS-485 and RS-232 digital interfaces allow connection to SCADA and IoT systems. With an LCD display for on-site visibility, this intelligent ultrasonic gas flow meter simplifies both local and remote monitoring.


Every industry has specific flow measurement requirements, and the ESEGAS LEUF-200 Ultrasonic Flow Meter is engineered to meet diverse operational challenges across multiple sectors.

  • Power Generation and Boilers: In thermal power plants and industrial boilers, accurate flue gas measurement is essential for optimizing combustion efficiency, controlling emissions, and meeting regulatory compliance. The LEUF-200 ensures reliable monitoring of exhaust gases to improve energy efficiency and reduce pollution.
  • Chemical and Petrochemical Industry: In facilities handling industrial gases and complex chemical reactions, precise flow monitoring prevents process instability, ensures safety, and optimizes production. The LEUF-200 is particularly effective in measuring corrosive or high-temperature gases common in chemical plants.
  • Natural Gas and Industrial Gas Applications: For sectors relying on natural gas distribution or specialized industrial gases, this Ultrasonic Flow Meter provides highly accurate, no pressure loss design monitoring. It supports billing accuracy, leakage detection, and process control.
  • Waste Incineration Plants: Controlling and monitoring exhaust gases from incinerators is vital for environmental compliance. The LEUF-200 offers stable and continuous measurements, even in fluctuating flow conditions, ensuring emissions remain within regulatory limits.
  • Steel and Metallurgy: High-temperature exhaust streams in steel production and metallurgical operations demand robust monitoring tools. The LEUF-200, with its durable SS316L construction, provides reliable flow measurements to improve furnace efficiency and reduce environmental impact.
  • HVAC and Ventilation Systems: In large commercial buildings, tunnels, or industrial ventilation networks, monitoring airflow is critical for maintaining air quality and safety. The LEUF-200’s adaptability to large ducts (up to 8 m diameter) makes it a practical choice for complex HVAC systems.
  • Environmental Monitoring: Governments and industries alike require accurate data on emissions to design and enforce environmental protection measures. The ESEGAS Ultrasonic Flow Meter delivers dependable results, supporting both compliance and sustainability initiatives.

By serving these industries, the LEUF-200 not only improves operational efficiency but also strengthens compliance with environmental standards, making it a versatile solution for modern industrial challenges.


Many users worry that flow meters require pipe cutting or system shutdowns for installation. The ESEGAS LEUF-200 Ultrasonic Flow Meter eliminates these concerns with a smart, non-intrusive design.

Its side-wall probe mounting ensures quick setup without interrupting operations. With no pressure loss design, high reliability, and minimal maintenance needs, it proves more cost-effective over its lifecycle compared to traditional meters.


As industries transition toward Industry 4.0, real-time monitoring and digital connectivity are essential. The LEUF-200 is built with this future in mind.

With support for intelligent data communication, remote integration, and predictive maintenance, the ESEGAS Ultrasonic Flow Meter ensures companies can achieve greater efficiency, safety, and compliance. Its adaptability makes it an investment for today’s needs and tomorrow’s digital transformation.


The ESEGAS LEUF-200 Ultrasonic Flow Meter offers high accuracy, durability, and intelligent features tailored to the needs of modern industries. By combining ultrasonic flow measurement with smart monitoring, it provides a reliable solution for applications ranging from natural gas measurement to emission control. With no pressure loss design and a strong reputation under the ESEGAS brand, it is a future-proof choice for industrial gas monitoring and environmental compliance.

If you have any questions about the ultrasonic flow meter, please contact us directly.

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