Butterfly valve positioner is not working
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Air ok
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4 to20 MA ok
Water went inside the positioner and its not working since then.
Check the restriction screw and pilot relay, check the auto manual screw and the sensitivity screw. You must also check the small valve inside the positioner and clean it.
There could be water in the nozzle. Try striking it manually to force water out. If not then the coil could be dead. check the air quality. Maybe because of Humid air the orifice/pilot relay or similar parts must have been choked. clean it carefully