Portable Ultrasonic Flow Meters Improve Industrial Flow Monitoring

Portable clamp-on ultrasonic flow meters are increasingly used where temporary or verification measurements are required without modifying existing piping. Emerson has expanded its flow measurement portfolio with the FLUXUS 631 series, designed for liquids, gases and steam in industries including oil and gas, chemicals, power generation, food and beverage, water and wastewater, mining and life sciences.

Non-intrusive flow measurement for industrial processes
The Emerson FLUXUS 631 series is intended for situations where permanent flow meters are unavailable, require verification or cannot be installed without interrupting production. The portable ultrasonic flow meters use externally mounted clamp-on sensors to measure flow through the pipe wall, eliminating the need to cut piping or bring the process offline.

The system supports temporary flow measurement, meter verification, equipment performance assessment, leak detection and condition monitoring. Typical applications include verifying installed flow meters, evaluating pump and compressor performance under operating conditions, identifying energy losses and monitoring thermal energy systems.

Portable platform for liquids, gases and steam
The FLUXUS 631 platform measures multiple process media using dedicated models for liquids, gases, saturated steam, superheated steam and thermal energy applications. Emerson states that a liquid measurement can be configured in less than five minutes through an integrated human-machine interface featuring installation graphics, live process values and trend visualization.

The device incorporates a rechargeable lithium-ion battery that supports more than 25 hours of continuous operation. A low-power mode extends operating time to as much as 80 days for long-term monitoring applications. The transmitter enclosure is rated IP65 and IP67, enabling deployment in demanding industrial environments.

Measurement technology and industrial connectivity
The portable flow meters incorporate ultrasonic transit-time measurement technology combined with advanced signal processing to maintain measurement performance in installations with disturbed flow profiles or limited straight pipe lengths. Different measurement principles and dedicated electronics enable operation across liquids containing limited gas or solid content, high-viscosity liquids, low-pressure gases and steam applications.

An integrated Dynamic Gas Meter function compensates for variations in gas composition and can determine gas density and concentration without requiring a gas chromatograph. The platform also provides dual measurement channels with update rates of up to 20 milliseconds.

For plant integration, the system supports Modbus RTU communication together with digital outputs, analog current outputs and USB interfaces for data transfer and configuration.

According to Rebecca Cottrell, Product Manager for Emerson's Measurement Instrumentation business, portable measurement enables operators to obtain flow data from locations that are not permanently instrumented, supporting maintenance planning, equipment verification and operational efficiency.

Industrial applications and operational benefits
The portable ultrasonic flow meter platform is designed for maintenance engineers, energy managers and instrumentation specialists requiring temporary or independent verification measurements. By eliminating process interruption during installation, the system supports operational continuity while extending measurement coverage beyond permanently installed instrumentation.

Potential applications include compressed air audits, thermal energy analysis, leak surveys, process optimization, commissioning activities and troubleshooting existing flow measurement installations.

Additional Context: Technical specifications and competitive benchmarking
Portable clamp-on ultrasonic flow meters are widely used where non-intrusive flow measurement is required. The FLUXUS 631 series competes with portable ultrasonic flow measurement platforms from Siemens, Endress+Hauser and Baker Hughes Panametrics, all of which employ transit-time ultrasonic technology for external pipe measurement in industrial environments. Benchmark criteria typically include measurement uncertainty, supported pipe diameters, operating temperature range, battery life, communication interfaces and resistance to challenging installation conditions.

According to Emerson's published technical specifications, the FLUXUS 631 platform offers measurement uncertainty of approximately ±1% of measured value for liquid applications, repeatability of ±0.15% of reading, dual measurement channels, response times down to 20 milliseconds, pipe diameter coverage from approximately 6 mm to 6.5 m depending on model, IP65/IP67 environmental protection, and battery operation exceeding 25 hours with an energy-saving mode extending operation to up to 80 days. These characteristics position the platform among high-performance portable ultrasonic flow meters intended for industrial verification, maintenance and energy management applications.

Edited by Sucithra Mani, Induportals editor – adapted by AI.

www.emerson.com