Invensys receives two new patents for DFT50 Digital Coriolis mass flow measurement technology

FOXBORO, Mass., Feb. 21, 2005 — Invensys has received two additional patents for the core technology of the company’s award-winning Foxboro CFT50 Digital Coriolis mass flowmeter. U.S. patent numbers 6,754,594 and 6,758,102 apply to the Digital Coriolis flowmeter and its ability to correct for two-phase flow. These techniques relate to the CFT50’s ability to accurately measure traditionally difficult-to-handle materials and gas/liquid (two-phase) flow. Two-phase flow is a major contributor to process interruptions, measurement inaccuracies, and deviations in product quality.

The new patents relate to new signal processing techniques used to provide useful measurements of both mass flow and density and the operational aspects of keeping the Coriolis meter running stably in single-phase or two-phase flow conditions (and dynamic transitions between these flow conditions). The first patent includes an advanced control and measurement system with high-speed digital signal processing that responds to changing flow conditions many times faster than standard Coriolis flowmeters. The second patent relates to detecting and compensating for two-phase flow conditions and generating a validated mass flow measurement. (Traditional Coriolis flowmeters either stall or provide inaccurate measurements in two-phase flow situations.)

The Digital Coriolis flowmeter technologies were developed through a collaborative program between the Foxboro Measurements and Instruments Division of Invensys Process Systems and Oxford University in the UK. These technologies are incorporated into the Foxboro CFT50 digital Coriolis mass flow transmitter. Introduced in 2002, the CFT50 has won numerous awards, including Best of Show in the ISA 2002 New Product Showcase.

For more information on the CFT50 mass flow transmitter or other advanced Foxboro measurement and instrument devices, readers can contact their local Invensys/Foxboro representative, visit the Foxboro Measurements and Instruments Web Site at The CFT50 mass flow transmitter can also be purchased on-line at

About Foxboro M&I Division

The Foxboro Measurements and Instruments (M&I) Division has a long-standing reputation for providing world-class measurement solutions. With a legacy of accurate, reliable and innovative products, the group prides itself on working with customers to achieve industry-best total solutions for optimum measurement or analysis of temperature, pressure, flow, and electrochemical variables.

About Invensys Process Systems [ ]

Process Systems, a business unit of Invensys plc, provides products, services and solutions for the automation and optimization of industrial process plants. Invensys Process Systems includes industry-leading brands such as Foxboro, Triconex, SimSci-Esscor, Wonderware, and Avantis, whose products are installed in more than 100,000 plants across the world. These range from small hybrid and batch plants to the world’s largest refineries, gas plants, petrochemicals plants, power plants, pulp and paper mills, and mineral processing plants.

The Invensys Group is headquartered in the UK and listed on the London Stock Exchange. With 35,000 employees operating in 60 countries, Invensys helps customers to improve their performance and profitability, building value for end users and shareholders alike.


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