Siemens Aktiengesellschaft

Gerhard Klebert

Klaus-Dieter Fiebelkorn

Klaus Ludwig

Wolfgang Clemens

Andre-Heinrich Meinhof

Alf Puettmer

Holger Schmaedicke

A positioner for a valve that is actuated by means of a drive. The positioner includes a locator ( ) and a control unit ( ). The locator ( ) detects the actual position of an actuator ( ). The control unit ( ) compares the actual position with a predefined desired position, and generates an actuating signal. A magnet ( ) having a magnetoresistive sensor, preferably a GMR sensor, is provided as the locator. The locator ( ) is less susceptible to dirt and less prone to wear and tear than a conventional slide potentiometer. The positioner is thus less fault-prone.

Positioner for a valve that can be actuated by a drive

The invention relates to a diagnostic system and method, especially for a valve ( ) that can be actuated by a positioner ( ) via a drive ( ). The system utilizes a sensor ( ) for recording structure-related sound and has a device ( ) for evaluating a recorded measurement signal ( ). A spectral region greater than 50 kHz is evaluated for conducting fault recognition. A fault indication signal is generated if the intensity of the measurement signal in this spectral region exceeds a defined threshold value. The sound caused by cavitation is primarily evaluated for conducting fault recognition.

Diagnostic system and method, especially for a valve

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Bad Herrenalb, Germany

Gerhard Klebert