Density meter improves quality for Cartier Del Garda paper mill

Accuracy of Micro Motion density meter removes need for expensive coating additives, enabling significant annual savings.

07/18/2011


Micro Motion density meter. Courtesy: Emerson Process ManagementCartiere del Garda is using a Micro Motion density meter from Emerson Process Management to accurately measure the concentration of kaolin and other additives in the coating process at its paper mill on the banks of Lake Garda in Italy. The Micro Motion 7845 Density and Concentration Meter provides highly accurate density measurements under entrained gas conditions.

"The highly accurate measurement of the coating mixture concentration  provided by Emerson's Micro Motion density meter means we have been able to  discontinue the use of expensive additives,” said Fulvio Prati, instrument  manager at Cartiere del Garda. “This has enabled significant annual savings and paper quality is improved."

Cartiere del Garda operates a modern paper mill in Italy, specializing in high quality coated papers. For many years, a Micro Motion Coriolis flowmeter was used to monitor the concentration of the paper coating mixture and this provided reliable and accurate results. However, because the recirculation system on the feeding tank generated entrained air, it was necessary to add expensive additives to the coating mixture to prevent quality problems.

Removing the additives would reduce production costs but would cause up to 20% air to be entrained in the coating mixture. The existing Coriolis flowmeter was not designed to provide the same degree of density measurement accuracy under these conditions, so Cartiere del Garda sought an alternative solution. The company needed an on-line, solids concentration measurement of the coating solution, made directly at the film coater machine feed. A minimum accuracy of +/-1 percent of solids was required to guarantee the high quality of the paper being produced and avoid waste caused by out-of-specification batches.

Cartiere del Garda chose a Micro Motion 7845 Density and Concentration Meter for this challenging application. The company specified the advanced electronics, entrained gas version, which is designed to accurately measure density in aerated liquids − providing a final accuracy of better than +/- 0.5 percent with very high stability and repeatability. The 7845 provides a 4-20 mA signal to the control system, related to line density. Density is converted into percentage solids using a formula embedded into the control system.

The Micro Motion 7845 is a straight tube, liquid density meter that uses a vibrating tube to measure density. As the liquid density changes, it affects the vibrating mass of the density meter. The change in vibrating mass then affects the resonant frequency, which is inversely proportional to the density of the process fluid. By monitoring the resonant frequency and applying well-known conversions, the 7845 provides highly accurate in-line density data.

The Micro Motion 7845 Density and Concentration Meter is rugged, reliable, and requires minimum maintenance. The meter is calibrated in an ISO17025-accredited laboratory, traceable to International standards, and requires no field calibration.

Emerson Process Management

www.EmersonProcess.com



No comments
Consulting-Specifying Engineer's Product of the Year (POY) contest is the premier award for new products in the HVAC, fire, electrical, and...
Consulting-Specifying Engineer magazine is dedicated to encouraging and recognizing the most talented young individuals...
The MEP Giants program lists the top mechanical, electrical, plumbing, and fire protection engineering firms in the United States.
2014 Product of the Year finalists: Vote now; Boiler systems; Indirect cooling; Integrating lighting, HVAC
High-performance buildings; Building envelope and integration; Electrical, HVAC system integration; Smoke control systems; Using BAS for M&V
Pressure piping systems: Designing with ASME; Lab ventilation; Lighting controls; Reduce energy use with VFDs
Case Study Database

Case Study Database

Get more exposure for your case study by uploading it to the Consulting-Specifying Engineer case study database, where end-users can identify relevant solutions and explore what the experts are doing to effectively implement a variety of technology and productivity related projects.

These case studies provide examples of how knowledgeable solution providers have used technology, processes and people to create effective and successful implementations in real-world situations. Case studies can be completed by filling out a simple online form where you can outline the project title, abstract, and full story in 1500 words or less; upload photos, videos and a logo.

Click here to visit the Case Study Database and upload your case study.

Protecting standby generators for mission critical facilities; Selecting energy-efficient transformers; Integrating power monitoring systems; Mitigating harmonics in electrical systems
Commissioning electrical systems in mission critical facilities; Anticipating the Smart Grid; Mitigating arc flash hazards in medium-voltage switchgear; Comparing generator sizing software
Integrating BAS, electrical systems; Electrical system flexibility; Hospital electrical distribution; Electrical system grounding
As brand protection manager for Eaton’s Electrical Sector, Tom Grace oversees counterfeit awareness...
Amara Rozgus is chief editor and content manager of Consulting-Specifier Engineer magazine.
IEEE power industry experts bring their combined experience in the electrical power industry...
Michael Heinsdorf, P.E., LEED AP, CDT is an Engineering Specification Writer at ARCOM MasterSpec.