New Coriolis flowmeter presses lower limits

Yokogawa introduces low-capacity dual bent-tube Coriolis meter.


The new ROTAMASS Coriolis flowmeter from Yokogawa.Yokogawa Electric Corporation has released its new RotaMass LR, which it characterizes as the the world’s smallest dual bent-tube Coriolis mass flowmeter. Designed to measure both liquids and gasses, the mass flow measurement spans from 0-40 kg/h, which corresponds to about 0-10.5 gph of water. The accuracy is ±0.15% for liquids and ±0.5% for gasses. The RotaMass LR aims at demand for accurate and stable measurement of fluids at low flow rates. Yokogawa has developed the low-flow Coriolis meter based on its proven dual bent tube design to overcome the current shortcomings of single-tube low-capacity flowmeters. These shortcomings include susceptibility to external vibrations and changes in ambient or process fluid temperatures which lead to less accurate and stable measurements in real-world conditions.

The dual bent-tube design decouples the core measuring element from process vibration that can cause fluctuating zero stability and decreased measurement accuracy. When fluid density changes, a single-tube Coriolis flowmeter can become imbalanced and start to behave like an emitter. This design remains balanced due to the equal mass change in both tubes and the absence of interference from the process piping. By design, it is insensitive to fluctuations in the ambient temperature and achieves excellent zero stability under changing process conditions. The two tubes are made from C-22 alloy, which is less susceptible to thermal expansion than conventional stainless steel.

The tube temperature measurement plays a key role in mass flow and density measurements. Normally, it is more difficult to measure temperature with Coriolis flowmeters that have tubes with a smaller surface area. This design solves that problem by using an inline temperature sensor, ensuring exact and fast measurements in process temperatures ranging from -50 to 150 °C.

Safety is a major concern with this design with a gas-tight, all-stainless-steel secondary containment that can handle pressures up to 65 bar. The meter itself can be used in high pressure applications up to 400 bar. A huge variety of welded process connections are available and no gaskets are used, minimizing the risk of leaks. Where fluid component separation and gas condensation are a concern, insulation and a heat jacket are available as an option.

Takashi Nishijima, a director and senior vice president, and head of the industrial automation platform business headquarters for Yokogawa says, "By measuring and controlling very low flow rates with a high level of precision, Yokogawa is helping its customers realize the VigilantPlant concept. We believe that this newly developed product gives customers a wider range of choices in multi variable process measurement and allows for greater accuracy and steady measurement in their utilization."

Edited by Peter Welander,

No comments
The Top Plant program honors outstanding manufacturing facilities in North America. View the 2013 Top Plant.
The Product of the Year program recognizes products newly released in the manufacturing industries.
The Engineering Leaders Under 40 program identifies and gives recognition to young engineers who...
Sister act: Building on their father's legacy, a new generation moves Bales Metal Surface Solutions forward; Meet the 2015 Engineering Leaders Under 40
2015 Mid-Year Report: Manufacturing's newest tool: In a digital age, digits will play a key role in the plant of the future; Ethernet certification; Mitigate harmonics; World class maintenance
2015 Lubrication Guide: Green and gold in lubrication: Environmentally friendly fluids and sealing systems offer a new perspective
Drilling for Big Data: Managing the flow of information; Big data drilldown series: Challenge and opportunity; OT to IT: Creating a circle of improvement; Industry loses best workers, again
Pipeline vulnerabilities? Securing hydrocarbon transit; Predictive analytics hit the mainstream; Dirty pipelines decrease flow, production—pig your line; Ensuring pipeline physical and cyber security
Cyber security attack: The threat is real; Hacking O&G control systems: Understanding the cyber risk; The active cyber defense cycle
Designing positive-energy buildings; Ensuring power quality; Complying with NFPA 110; Minimizing arc flash hazards
Building high availability into industrial computers; Of key metrics and myth busting; The truth about five common VFD myths
New industrial buildings: Greener, cleaner, leaner; New building designs for industry; Take a new look at absorption cooling; Offshored jobs start to come back

Annual Salary Survey

After almost a decade of uncertainty, the confidence of plant floor managers is soaring. Even with a number of challenges and while implementing new technologies, there is a renewed sense of optimism among plant managers about their business and their future.

The respondents to the 2014 Plant Engineering Salary Survey come from throughout the U.S. and serve a variety of industries, but they are uniform in their optimism about manufacturing. This year’s survey found 79% consider manufacturing a secure career. That’s up from 75% in 2013 and significantly higher than the 63% figure when Plant Engineering first started asking that question a decade ago.

Read more: 2014 Salary Survey: Confidence rises amid the challenges

Maintenance and reliability tips and best practices from the maintenance and reliability coaches at Allied Reliability Group.
The One Voice for Manufacturing blog reports on federal public policy issues impacting the manufacturing sector. One Voice is a joint effort by the National Tooling and Machining...
The Society for Maintenance and Reliability Professionals an organization devoted...
Join this ongoing discussion of machine guarding topics, including solutions assessments, regulatory compliance, gap analysis...
IMS Research, recently acquired by IHS Inc., is a leading independent supplier of market research and consultancy to the global electronics industry.
Maintenance is not optional in manufacturing. It’s a profit center, driving productivity and uptime while reducing overall repair costs.
The Lachance on CMMS blog is about current maintenance topics. Blogger Paul Lachance is president and chief technology officer for Smartware Group.