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Flexim Fluxus G Series Clamp-On Ultrasonic Gas Flow Meter: Non-Invasive Gas Monitoring for Industrial Applications

Quick Answer: The Flexim Fluxus G Series clamp-on ultrasonic flow meter measures gas flow from outside the pipe. No pipe cutting, no process shutdown, and no contact with the medium. It works on metal or plastic pipes from DN15 up to large transmission lines, handling pressures to 100 bar and temperatures from -40 °C to 200 °C. Silver Automation Instruments supplies the full G Series range with application support for Southeast Asia, Oceania, Middle East, Africa, and Latin America.

How the Fluxus G Series Solves Real Gas Measurement Problems

Engineers in gas distribution, chemical processing, and power generation often face a hard choice. Cut into a live high-pressure gas line for a conventional meter, or accept no flow data at all. The Fluxus G Series removes that trade-off. Its clamp-on transducers mount directly onto the outside of the pipe wall and send ultrasonic signals through the gas. The meter calculates flow velocity from the transit time difference, giving you volumetric flow at standard or actual conditions without ever touching the gas.

Silver Instruments has shipped these meters to LNG terminals in Malaysia, ammonia plants in Nigeria, and hydrogen blending stations in Australia. In each case the customer avoided welding, hot work permits, and weeks of downtime. One chemical site in Saudi Arabia installed a G601 on a 6-inch stainless steel line carrying nitrogen at 28 bar. The team clamped the transducers in under two hours and had stable readings the same shift. That kind of speed changes maintenance budgets.

Key Technical Details That Matter for Your Application

Not all clamp-on meters can handle gas. The Fluxus G Series was built specifically for gaseous media. It uses Lamb wave and shear wave modes depending on pipe material and wall thickness. The system auto-selects the best mode during setup. Pipe diameters range from DN15 to DN2000. The meter handles common industrial gases: natural gas, compressed air, nitrogen, oxygen, hydrogen, carbon dioxide, and many mixed gas streams.

Accuracy is typically 0.5 % to 2 % of reading, depending on pipe condition and flow profile. Repeatability sits at 0.15 %. The transmitter outputs 4-20 mA HART, pulse, and Modbus RTU, so it drops straight into your PLC or DCS. You can order the meter with ATEX Zone 1 or Class I Div 2 certification for hazardous areas. The electronics are housed in a field-mountable IP67 enclosure that survives direct sun and monsoon rains.

We often hear the same question: “Will it work on my old pipe with some internal scale?” In practice, heavy scale or thick internal coatings reduce signal quality. But the Fluxim G Series couples through wall thicknesses up to 50 mm on steel and uses powerful transducers that punch through moderate fouling. We recommend a site survey with pipe details (material, OD, wall thickness, lining if any) before quoting. Send those details to [email protected] and our engineers will confirm feasibility in one working day.

Where the Fluxus G Series Fits Best

Oil and gas operators use the G Series for flare gas monitoring, fuel gas to turbines, and custody transfer checks. A gas processing plant in Queensland put G608 meters on 10-inch flare lines running at near-atmospheric pressure. The meters tracked low-flow events that older thermal mass meters missed. The data helped the plant reduce methane slip and meet EPA reporting targets.

In the food and beverage sector, CO2 and nitrogen dosing lines are common. The G Series measures gas flow to carbonation tanks without any contamination risk because the transducers never touch the gas. A brewery near Ho Chi Minh City installed three G601 units on CO2 lines and reduced gas consumption by 12 % simply by detecting a leak between batches. The R