26 EMERSON
Pulp Paper & Logistics
the signals are very low, which makes them unreliable. However, Södra solved this by installing Rosemount 5408 Non-Contacting Radar Level Transmitters with parabolic antennas. The 5408 uses FMCW
technology, and its increased sensitivity allows it to successfully measure lime powder, despite its low dielectric constant. The parabolic antenna’s built-in air purging adapter prevents the lime powder from building up. To ensure accurate measurement, the 5408 uses special software algorithms specifically designed to handle the characteristics of solids.
Since being installed, the 5408 May/June 2019
has proved to be extremely reliable. Despite the dusty conditions the 5408 has required less maintenance and downtime, leading to improved productivity. Södra also needed to find a
better way of measuring the level in mixing tanks containing a mixture of lye and soap. The media is aggressive and contaminating, with a dense, thick layer of foam forming on its surface. A number of different technologies had been tried to accurately and reliably measure the level in the 18-metre tanks. Mechanical devices experienced problems caused by build- up, while the nozzle of GWR transmitters proved to be too
narrow, causing measurement errors whenever the probe came close.
The build-up problem required
Södra to find system that was resistant to the media, so installed Rosemont 5408 level transmitters with PTFE process seal antennas. The superior sensitivity and
advanced software functions of the Rosemount 5408 enable it to accurately measure through foam, even when the surface is turbulent. The transmitter’s signal quality measurement functionality is able to detect abnormal process conditions such as antenna coating, while its PTFE process seal prevents the media from
Since integrating the Rosemount 5408 into the distributed control system at the mill, Södra has been delighted with the results
building up on the transmitter, thereby maintaining an accurate and reliable measurement. Since integrating the Rosemount 5408 into the distributed control system at the mill, Södra has been delighted with the positive results. These include significantly reduced maintenance and downtime, and an increase in productivity. More information from www.
Emerson.com/rosemount5408 • Ingemar Serneby works for Emerson Automation Solutions
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