Product category:
Conventional Industrial Liquid flowmeters
News Release from: Krohne | Subject: EMFs at EVC
Edited by the Processingtalk Editorial
Team on 08 May 2003
EVC standardises on magnetic induction
meters
Europe's largest PVC polymer manufacturer has chosen Krohne as its partner for a programmed upgrade of flowmeters at its emulsion PVC polymer plant at Thornton-Cleveleys, Lancashire
European Vinyls Corporation (EVC), Europe's largest PVC polymer manufacturer, is standardising on the comprehensive range of Krohne magnetic induction meters to replace existing magmeters, employed extensively across the manufacturing operation, and oval gear meters used for measuring low flow Krohne electromagnetic flowmeters are used at more than 30 locations in the plant for various duties including batching component parts of the wide range of formulations produced for different customers
This article was originally published on Processingtalk on 30 Jan 2003 at 8.00am (UK)
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Following a review of flowmeter manufacturers and a production risk survey at the plant, control electrical engineer Ken Hulme has worked closely with Krohne to identify the appropriate meters from the company's range to meet their needs.
Electromagnetic flowmeters (EMFs) with three different diameters and the option of hazardous area Ex ratings were identified as offering direct replacements, and they will be kept in stock at the plant to enable immediate substitution for any of the old meters when they malfunction.
Demineralised water handled by some of the flowmeters at the plant, presents a specific challenge because of the low conductivity which makes it difficult to monitor with electromagnetic meters, but it is within the range of the selected Krohne meters.
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Oval gear meters are currently being used for handling aqueous solutions at low flow rates, but they are subject to wear and prone to clogging if any particulates are present in the liquid, to eliminate these problems, they are in the process of being replaced with 6mm bore Krohne EMF units.
Ken Hulme, comments: 'The reliability of equipment is a prime consideration in maintaining production levels at the plant, and we were obviously concerned about the units which have seen long service and could no longer guarantee performance.
The comprehensive range of Krohne electromagnetic meters was able to meet the most demanding needs and their application engineers have worked with us to develop a product and stock supply solution that mirrors our requirements'.
Electromagnetic flowmeters are the most widely used flow technology today and have become increasingly popular due to their high accuracy, reliability, and low pressure drop.
Typically, the flowmeter's body contains a pair of externally energised magnetic coils that create a magnetic field through which the conductive liquid passes.
Electrodes placed in a plane perpendicular to the coils pick up the tiny voltage generated by the passage of the liquid, which is directly proportional to the velocity of the flow.
For liquids with very low conductivity, a capacitance or electrodeless magmeter can be used.
No electrodes come into contact with the process fluid and instead they are insulated by the liner and capacitively coupled to the process fluid.
Electromagnetic flowmeters provide excellent accuracy with conductive liquids flowing into a full pipe and can also be used with slurries.
The effectiveness of magmeters depends on accurate calibration by the manufacturer and Krohne, as one of the world's leading manufacturers of level and flow measurement instrumentation, has the world's largest flow calibration facility at its factory in Dordrecht.
Krohne is one of very few manufacturers able to offer a complete range of flowmeters, including electromagnetic, ultrasonic, vortex, variable area and Coriolis devices.
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