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In 2021, a supermajor with a refinery in the far northern continental  USA, came to us looking for a solution to their need to install two Non-Intrusive Pig Signallers.  One was to be installed just inside the fence of the facility and was to be powered by local 24VDC.  The other unit was outside the fence of the facility and was to provide warning of the approach of the pig.  The second unit was too far away to be powered economically and needed to be able to communicate with their local PLC

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