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.


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

No comments
The Engineers' Choice Awards highlight some of the best new control, instrumentation and automation products as chosen by...
The System Integrator Giants program lists the top 100 system integrators among companies listed in CFE Media's Global System Integrator Database.
The Engineering Leaders Under 40 program identifies and gives recognition to young engineers who...
This eGuide illustrates solutions, applications and benefits of machine vision systems.
Learn how to increase device reliability in harsh environments and decrease unplanned system downtime.
This eGuide contains a series of articles and videos that considers theoretical and practical; immediate needs and a look into the future.
Choosing controllers: PLCs, PACs, IPCs, DCS? What's best for your application?; Wireless trends; Design, integration; Manufacturing Day; Product Exclusive
Variable speed drives: Smooth, efficient, electrically quite motion control; Process control upgrades; Mobile intelligence; Product finalists: Vote now; Product Exclusives
Machine design tips: Pneumatic or electric; Software upgrades; Ethernet advantages; Additive manufacturing; Engineering Leaders; Product exclusives: PLC, HMI, IO
This article collection contains the 5 most referenced articles on improving the use of PID.
Learn how Industry 4.0 adds supply chain efficiency, optimizes pricing, improves quality, and more.

Find and connect with the most suitable service provider for your unique application. Start searching the Global System Integrator Database Now!

Cyber security cost-efficient for industrial control systems; Extracting full value from operational data; Managing cyber security risks
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