Schwartz masters turbulent measurement

01 November 2006

Schwartz GmbH followed up its installation of two Krohne Optiwave radar level gauges by placing orders for additional instruments.

Successful trials of Optiwave demonstrated an improvement in production efficiency
Successful trials of Optiwave demonstrated an improvement in production efficiency

The industrial plastics manufacturer invested in the gauges following successful trials that demonstrated improved production efficiency.

Krohne’s Optiwave instruments have not disappointed and are claimed to have improved level measurement accuracy of raw material which is kept agitated in containers prior to processing.

Products at Schwartz are manufactured from polyamide, a plastic made from processing a raw material called caprolactam. During production, caprolactam, which has a density similar to water, needs to be heated for it to remain liquid. Before processing, it is stored in relatively small, two-meter high containers where it is maintained at 120°C.

The containers are fitted with agitators which, because of the turbulent surface they create on the liquid, make it difficult to accurately monitor the precise level of material in the tanks. Previously the company used float-type devices which led to unreliable measurement readings being taken.

The new radar level gauges measure to an accuracy of +/-3mm, despite uneven liquid surface. Their relatively small antennas and high-resolution measurement frequency mean they are suitable for applications involving small containers and turbulent surfaces.

A pre-programmed ‘Agitator Tank’ option on the Optiwave automatically compensates for fluctuations in level readings to provide accurate measurement output.

Ulrich Kottlamp, works manager at Schwartz, said: “We are really satisfied with these two Krohne Optiwave units because they let us detect the filling levels in our tanks with far more accuracy than was previously possible.”

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