Method for determining an operating position of an open/closed valve and field device

摘要: In a method or field device for determining position of an open/closed-valve positioned by pneumatic actuating drive and movable to completely opened open closed depending on operating requirements, during normal operation working chamber the is pneumatically influenced with i/p converter such that moves one open/closed positions and, in case predetermined condition, allows vent so valve automatically other positions. At least pressure prevailing control output at captured continuously over time, thus obtaining change time basis which physical operational variable determined.