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PLC Software Eliminates Need for Standalone Flow Computer; Highly Accurate Flow Control can be Achieved at Lower Cost.

NORTH ANDOVER, Mass., July 10 /PRNewswire/ --

A technological breakthrough from Schneider Electric promises more accurate gas flow computations at lower cost. The Starling Associates Gas Flow Loadable Function Block for electronic flow measurement allows calculations to be done in a programmable logic controller, eliminating the need for a separate, standalone flow computer.

Kenneth Starling, who wrote the flow equation code that is accepted by the American Gas Association (AGA), replicated the code for Schneider Electric. The function block eliminates the need for an additional computer in the field, saving on operation and maintenance costs. The simplified system also is more accurate than flow computers because information does not have to be transmitted to a separate computer. All calculations are handled directly within the PLC, which maintains an audit trail in protected memory.

The gas flow computation software is available for select models of MODICON(R) COMPACT(TM) and MICRO(TM) controllers. It runs in 984 ladder logic and is compatible with MODSOFT(R) 2.5 or higher, PROWORX(R) NXT and CONCEPT(R) PLC programming software. It's also compatible with Meter Manager software available from Starling Associates.

The function block meets the requirements of AGA 3 for orifice plate meters and the AGA 8 and NX-19 compressibility equations used for special gas compositions. It also conforms to the American Petroleum Institute (API) audit trail and event log requirements for custody transfer.

Applications for the gas flow function block include custody transfer, allocation metering and well testing, flow control and plant balance.

For literature on MODICON automation products from Schneider Electric, call 1-800-392-8781. For technical questions, call 1-800-468-5342.

Schneider Electric, the World's Power and Control Specialist with leading international brands such as MERLIN GERIN, MODICON, SQUARE D and TELEMECANIQUE, anticipates and meets its customers' needs in the energy, buildings, industry and infrastructure markets. Schneider Electric's 67,000 employees generated sales of approximately $9.7 billion in 2000 through 9,000 sales outlets in 130 countries. Visit Schneider Electric at,, or

CONTACT: Jeanne Schweder of pricemcnabb, 704-916-6173, or fax, 704-375-0222, or, for Schneider Electric

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Publication:PR Newswire
Date:Jul 10, 2001
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