ST51 Series Thermal Mass Flowmeter

• The ST51 Series Thermal Mass Flowmeter is designed for direct mass flow measurement of gases.

• Using a constant–temperature–difference thermal dispersion principle, the meter measures both gas mass flow rate and gas temperature without the need for external pressure or temperature compensation.

• With negligible pressure loss, high sensitivity, and fast response, the ST Series is suitable for clean gas measurement in process control, energy management, and environmental monitoring applications.

• Fully welded stainless-steel construction, no moving parts, and an intelligent modular transmitter design provide long-term stability and low maintenance in harsh operating environments.

• Natural Gas Mass Flow Measurement in Industrial Boilers

ST in-line meters installed on DN25…DN80 natural gas lines measure true gas mass flow and temperature. Without external pressure or temperature transmitters, the system obtains stable mass or standard volume flow for billing, energy balance, and boiler efficiency analysis.

• Nitrogen Flow Monitoring for Inerting and Blanketing

On nitrogen lines feeding storage tanks or reactors, the ST Series provides high-sensitivity mass flow measurement with fast response. Modbus or HART communication allows the DCS to precisely control inert gas consumption and maintain safe oxygen levels.

• Compressed Air Network Monitoring and Leak Detection

In plant-wide compressed air systems, insertion ST meters are installed on main and branch headers. Negligible pressure loss and wide turndown enable accurate monitoring from low night-load flows to peak demand. Logged data supports leak detection and energy cost allocation.

• Flue Gas and Combustion Air Measurement in Boilers and Furnaces

ST meters on combustion air and clean flue-gas lines provide real-time mass flow feedback to combustion control loops. The wide temperature capability (up to 300 °C gas temperature) and stainless-steel construction ensure long-term stability in thermal process environments.

• Process Gas Flow in Chemical Reactors and Dryers

On process gas feeds (e.g., nitrogen, dry air, inert gases) to reactors, dryers, or coating systems, the ST Series delivers stable mass flow signals. High resolution and fast response help maintain consistent product quality under fluctuating load conditions.

• Vent and Exhaust Gas Monitoring for Environmental Reporting

Installed on clean vent or exhaust lines, ST meters provide continuous mass flow monitoring of gases discharged to atmosphere. Totalised values can be used for internal environmental reports and process optimization, provided that gas composition remains within the meterʼs compatibility limits.