Emerson has released the Flexim FLUXUS 631 series of portable non-intrusive clamp-on ultrasonic flow meters for liquids, gases, steam, and thermal energy measurement.
The new series is designed for temporary, on-demand flow measurement without interrupting operations. Emerson is targeting industrial and municipal applications including oil and gas, chemical production, power, food and beverage, water and wastewater, metals and mining, and life sciences.
The 631 series sits at the top of Emerson’s portable flow measurement portfolio and is intended for use where permanent meters are unavailable, where verification is required, or where temporary data is needed to understand equipment and process performance. Applications include flow meter verification, pump and compressor assessment, condition monitoring, leak detection, and energy performance analysis.
Clamp-on ultrasonic measurement avoids direct contact with the process medium. Transducers are mounted outside the pipe, allowing flow measurement without cutting into pipework, shutting down the process, introducing pressure loss, or exposing a meter to corrosive, hot, contaminated, or high-pressure fluids. That makes the technology useful for audits, troubleshooting, commissioning, and temporary monitoring across complex plants.
Emerson says a liquid measurement can be running in under five minutes, supported by a human-machine interface with a large integrated display, installation graphics, live values, and trend visualisation. The platform includes a high-capacity lithium-ion battery for more than 25 hours of autonomous operation, while a low-power mode can extend operating time up to 80 days for longer monitoring tasks.
The enclosure is rated to IP65 and IP67 for demanding environments. Advanced compensation mechanisms are designed to support accurate measurement in disturbed flow, including installations with limited straight pipe runs. Models are available for liquids, gases, low- and high-temperature steam, and thermal energy.
The breadth of measurement is important because plants rarely have perfect instrumentation coverage. Permanent meters are usually installed at critical points, but process engineers often need temporary data from locations that were not instrumented during the original design. Plant modifications, energy audits, troubleshooting, leak investigations, and maintenance checks can all require measurement beyond the fixed installed base.
The gap between installed instrumentation and real plant behaviour is becoming more costly as energy performance and asset reliability move higher up the operating agenda. Sites are under pressure to reduce energy consumption, improve uptime, and detect losses earlier. Portable flow measurement gives engineering teams a practical way to test assumptions about flow, heat transfer, equipment performance, and leakage without committing immediately to permanent installation work.
The 631 series includes features aimed at difficult media and operating conditions. Emerson says different measuring principles and advanced electronics support repeatable measurement across low-pressure gases, liquids with entrained gas or solids, high-viscosity liquids, saturated steam, and high-temperature steam. Its Dynamic Gas Meter feature is designed to maintain measurement despite variations in gas composition while also allowing gas density and concentration to be determined without a chromatograph.
Dual measurement channels and update rates of up to 20 milliseconds support faster process insight. Connectivity options include Modbus RTU, digital and current outputs, and USB interfaces for configuration and data transfer. These connections are important because portable instruments are increasingly expected to feed structured workflows rather than remain isolated as handheld diagnostic tools.
The value of portable measurement lies in turning uncertain process behaviour into measured evidence. A temporary meter can verify whether installed instruments are drifting, whether a pump is operating near its intended point, whether steam or thermal energy use matches expectations, and whether leakage or bypass flow is affecting performance. In plants where downtime is expensive and pipe access is limited, non-intrusive measurement can shorten the route from suspicion to action.
The launch reinforces a wider instrumentation shift toward flexible deployment, faster diagnostics, and better visibility across assets that were not fully instrumented when built. Fixed meters remain essential, but portable systems help close the gap between design intent, operating reality, and maintenance decision-making.
