Foxboro Coriolis Flowmeter Provides ‘Breakthrough’ in Filling System Measurement and Performance

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The Foxboro Measurements & Instruments Division (http://www.foxboro.com/instrumentation) of Invensys is providing advanced digital Coriolis technology to assist Mount Packaging Systems, Ltd., (http://www.mountpackaging.com) in developing and implementing automatic short-batch, rapid filling systems. Headquartered in Dewbury, U.K., Mount Packaging specializes in providing technical solutions for difficult filling applications with liquids and pastes including paints, chemicals, lube oils, adhesives, and food products.

The Foxboro Measurements & Instruments Division (http://www.foxboro.com/instrumentation) of Invensys is providing advanced digital Coriolis technology to assist Mount Packaging Systems, Ltd., (http://www.mountpackaging.com) in developing and implementing automatic short-batch, rapid filling systems. Headquartered in Dewbury, U.K., Mount Packaging specializes in providing technical solutions for difficult filling applications with liquids and pastes including paints, chemicals, lube oils, adhesives, and food products.

Based on initial testing, as well as full scale production at a customer beta site, Mount Packaging now has a new technology from Invensys; the Foxboro CFT50, which it considers to be a “breakthrough” in Coriolis flow measurement for automated filling applications. Mount Packaging is now achieving consistent, reliable results well within its quality target range and offers systems with quick dynamic response to consistently handle small batches, and eliminate product waste.

Over the years, Mount Packaging has implemented a variety of methods to help its customers achieve consistent, accurate measurement of the materials that its machines dispense. While customers have been largely satisfied with the traditional measurement methods, company officials were aware of certain limitations of each approach and had identified measurement technology as an improvement area in their efforts to provide customers with continuous quality enhancements. One of the conventional measurement methods is volumetric piston filling, which is quite accurate, but has a limited turndown ratio of approximately 20:1 and poor repeatability at the bottom end of the range. Trimming the fill size must also be done mechanically. Weigh-scales, another conventional measurement technology, are limited in a different way. They require trickle or ramping flow at the end of each fill, which is time consuming and causes spillages that can lead to erroneous readings.

To overcome these limitations, Mount Packaging officials experimented with conventional Coriolis flow measurement technology, but had mixed results. “We tried traditional Coriolis meters, but they did not deliver the repeatability we require,” said Kevin Beaumont, managing director of Mount Packaging.

While conventional Coriolis meters were very accurate with steady flow in longer batches, they lacked responsivity to rapid flow changes during the course of short batches. Moreover, when used with viscous fluids like paint, even small levels of gas in liquid (two-phase flow) skewed Coriolis readings. Beaumount found that Foxboro, in collaboration with Oxford University, has improved Corliolis mass flow measurement using digital technology to keep the flowtubes in constant motion; so there is no loss of flow measurement during dynamic flow conditions. Using this approach, the Foxboro CFT50 digital Coriolis mass flowmeter, re-tunes the drive frequency of the Coriolis flowtubes every half cycle. Built-in algorithms also compensate digitally for inaccuracies resulting from two-phase flow.

Mount Packaging initially tested the CFT50 transmitter on a 1-1/2-inch (40 mm) flowtube with a nominal flow capacity of 900 lbs/min (6.8 kg/s). In this application, the CFT50 produces pulses that correlate with product weight, for example three pulses per ml of flowing liquid – and transmits these pulses to a PLC, which counts them and is programmed to actuate the shut-off valve when the target fill weight is achieved.

Mount Packaging is now getting consistent results well within target. The trial system provided precise performance with consecutive runs on filling 1.1 pounds (0.5 kg) batches, in short runs of 0.5 sec., which are repeatable to ± 0.004 lbs (2 g). And the consistency proved itself in full scale production as well. One of their customers achieved repeatability well below 0.1 percent during 64 consecutive batch runs, at 4.2 sec, to fill 2.64 gallon (10 liter) cans, with a target weight of 30.95 lbs. (14.04kg). “This technology has huge potential and we're looking forward to taking it out to all our customers,” says Beaumont.

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 http://www.foxboro.com/instrumentation or call 866-746-6477 (508-549-2424 outside the U.S. and Canada). The CFT50 mass flow transmitter can also be purchased on-line at http://www.buyautomation.com.

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

Invensys is the world leader in industrial asset performance management. In addition to its rapidly expanding Global Solutions and Performance Management services groups, Invensys’ automation businesses 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 upstream projects, refineries, gas plants, petrochemicals plants, power plants, and pulp and paper mills.

For more information on Invensys’ process automation businesses, please visit http://www.invensys.com/ps. For more information on Invensys’ recently-announced groundbreaking InFusion enterprise control system, please visit http://www.infusionecs.com.

The Invensys Group (http://www.invensys.com) is headquartered in London and is listed on the London Stock Exchange, with approximately 30,000 employees working in 60 countries.

Invensys, SimSci-Esscor, DYNSIM, SIM4ME, Foxboro, Triconex, Wonderware, Avantis and InFusion are trademarks of Invensys plc, its subsidiaries, or affiliates. All other brands and product names may be trademarks of their respective owners.

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