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Hello List About 12 months ago I seen a thread about keeping the wet leg for a Dp transmitter open from blockages. The application is for sump levels in a coal preparation plant. Where slurry or magnetite especially after a shutdown have a tendency to block the wet leg of the Dp transmitter. I can't remember whether this is a regulated water or air stream passing across the diaphragm. If anyone can remember or knows of this technique, comments would be appreciated. Regards Phil Dryburgh