The VSAN Thermal Mass Flow Meter is a highly accurate and reliable flow measurement instrument specifically designed for the direct measurement of gas mass flow without requiring additional pressure or temperature compensation. Utilizing advanced Thermal Dispersion Technology, the flow meter measures the actual mass flow rate of gases, making it an ideal solution for industrial process control, energy management, compressed air monitoring, and environmental applications.
Unlike conventional flow meters that measure volumetric flow, the Thermal Mass Flow Meter directly measures the mass flow rate of gases, providing superior accuracy even when pressure, temperature, or gas density changes. This eliminates the need for external compensation devices and reduces overall installation costs while improving process efficiency.
The VSAN Thermal Mass Flow Meter features a robust sensor with high-sensitivity temperature elements capable of detecting minute changes in heat transfer caused by flowing gas. Advanced microprocessor-based electronics continuously process these signals to provide stable, accurate, and repeatable measurements over a wide flow range.
Available in Insertion Type and Inline Type configurations, the flow meter is suitable for small and large diameter pipelines. It supports a variety of industrial communication options, including 4–20 mA Analog Output, Pulse Output, RS485 Modbus RTU, HART (Optional), Profibus (Optional), and Ethernet (Optional), allowing seamless integration with PLC, DCS, SCADA, and Industrial Automation systems.
The VSAN Thermal Mass Flow Meter is suitable for measuring compressed air, natural gas, nitrogen, oxygen, hydrogen, biogas, methane, carbon dioxide, argon, helium, and other clean industrial gases. Its rugged stainless steel construction, low pressure drop, and maintenance-free operation make it a preferred choice for continuous gas flow monitoring in demanding industrial environments.
Designed for long-term reliability and operational efficiency, the VSAN Thermal Mass Flow Meter delivers exceptional performance across industries such as Oil & Gas, Power Generation, Chemical Processing, Steel Plants, Food & Beverage, Pharmaceutical, Semiconductor, and Water Treatment.
The VSAN Thermal Mass Flow Meter operates based on the Thermal Dispersion Principle, which measures the amount of heat carried away by the flowing gas.
The sensing probe contains two precision temperature sensors. One sensor continuously measures the actual gas temperature, while the second sensor is heated to a constant temperature above the gas temperature using an integrated heating element.
When there is no gas flow, only a small amount of heat is dissipated from the heated sensor. As the gas begins to flow, it removes heat from the heated sensor. The faster the gas flows, the greater the cooling effect. The electronic transmitter continuously monitors the electrical power required to maintain the heated sensor at a constant temperature difference.
The amount of power required is directly proportional to the mass flow rate of the gas. Using advanced digital signal processing and factory calibration data, the transmitter accurately calculates and displays the mass flow rate, totalized flow, gas velocity, and other process parameters.
Since the measurement is based on the thermal properties of the gas rather than volume, the flow meter provides direct mass flow measurement without requiring separate pressure or temperature compensation, ensuring high accuracy and reliable performance even under varying operating conditions.
The VSAN Thermal Mass Flow Meter is widely used for accurate gas flow measurement across various industrial processes where direct mass flow monitoring is essential.
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