Micro Motion Sets New Bar in Mass Flow, Density Measurement

Micro Motion Improved Their Gas Mass Flow Accuracy to Better Than +/- 0.25%, and They Have Proven This on Their Primary Gravimetric Calibration Stand

By Walt Boyes

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Emerson bid farewell to the iconic triangle of its Micro Motion Elite Coriolis mass flowmeters at a Tuesday press conference this week at the Emerson Global Users Exchange. In its stead, explained Andy Dudiak, Micro Motion vice president and general manager, is the next generation Elite CMFS (for Coriolis Mass Flow Sensor), a fully drainable mass meter that sets a new standard in high-performance mass flow measurement.

"We were able, because of our unmatched design capabilities, to produce a new meter family with real advances," Dudiak said. "The accuracy of the new instrument is +/- 0.05% of mass flow, +/- 0.05% of volume flow, and +/- 0.0002 g/cc density, with 30:1 turndown. That's high meter rangeability, and we've made it more stable at low flows. The zero stability of the instruments reflects a 50% improvement over the previous generation of Elite meters."

He added, "We have improved our gas mass flow accuracy to better than +/- 0.25%, and we have proven this on our primary gravimetric calibration stand. We can handle bubble flow, slug flow of gases and liquids, and full/empty/full flow conditions. We have improved our Smart Meter Verification and made it possible to use WirelessHART to remotely verify the calibration of the product."

Also Read: Emerson's Diagnostic Tool for Coriolis Flow and Density Meters

"It is more than technology," added Neal Ingram, president of Emerson Process Management's Precision Flow group. In the past 36 years, he noted, engineeers for the Micro Motion product line have received over 50 U.S. patents and 1,500 patents worldwide. Plus, Emerson has introduced 50 new products just in the past five years, Ingram said. The Micro Motion operation also has adapted to the demands of supplying flow and density instrument globally, including support for a multilingual call center, smart phone apps, training videos and an assortment of web- and social-media portals.

Dudiak then turned to the new vibration density and viscosity devices. Combining the latest Coriolis design into a product optimized for density, he proclaimed that the new Compact Density Meter raises the standard for online density metering and enhances custody transfer, processing and blending operations.

"We know our customers want application-specific solutions," he said. "They want human-centered design solutions for easy start-up and maintenance, and they want simplified system integration with the plant networks so they can remotely diagnose meter health."

Then he described the new Gas Density Meter, a vibrating fork type meter that measures gas density and provides gas purity and blending measurements.

Additionally, he showed the new Specific Gravity Meter, a vibrating tube meter that provides measurements of specific gravity, molecular weight, gas purity, BTU/calorific value and Wobbe Index.

"Customers want legacy flow computer support," Dudiak said, "so we've provided the meters with frequency and 4-20 mA analog outputs, as well as HART-to-WirelessHART and Modbus-to-FOUNDATION-fieldbus support. We have provided a new diagnostic capability called Known Density Verification that checks the meter for measurement alarm conditions, sensor integrity and the presence of coating, erosion or corrosion, and we have included integrated links to ProLink, AMS and other asset portal tools."

Dudiak went on to describe specific applications for these instruments, including fuel gas monitoring, heavy fuel oil combustion control, and—last but not least—alcohol distillation monitoring. "Absolut vodka has to have very tight concentration control, for tax purposes, from 40.0% to 40.1% alcohol concentration, and they are using the flow value from the Compact Density Meter to give them percentage alcohol by volume (ABV). This keeps them within spec without giving any extra alcohol away. It also prevents them from running the still too fast, which burns the grain and imparts a 'strange' taste to the vodka, and we don't want our vodka to taste funny."

The new family of meters shares a common user interface and has the same look and feel as the other members of the Micro Motion production system.

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