Abstract: A method of improving a timing of a planned maintenance of a wear part in a device, in particular in an electropneumatic or electric motor-driven process valve, is provided. In a method step, at least one system value of the device, which is related to the wear of the wear part, is acquired by an acquisition device during operation of the device. The at least one system value is evaluated by an analysis unit and a maintenance time is determined by the analysis unit at which the wear part is to be replaced on the basis of the at least one system value. When the system value reaches a defined maintenance value, the wear part is replaced. The wear part replaced is assessed with regard to its wear and classified into one of three categories, a first category denoting too early a replacement of the wear part, a second category denoting a timely replacement of the wear part, and a third category denoting too late a replacement of the wear part.

Abstract: A method of monitoring a state of a component and/or a process value including detecting and comparing at least one value characteristic of the state to be monitored with a defined value, and/or a process value, wherein, for each deviation of the detected value from the defined value, a mean value of the deviation or of the detected characteristic value is calculated and/or a maximum value and/or a minimum value and/or a count value is determined and first stored in a first storage cell within a preset first time interval. The further storage cells are successively filled in the same way for one respective preset time interval until all storage cells present are filled with a corresponding value.

Abstract: A diagnosis method for continuous function monitoring of a process valve during normal operation. The diagnosis method includes the steps of determining process set data (S) with discrete-time process set values from an input signal supplied to the process valve, b) determining process actual data (s) with discrete-time process actual values using a displacement-measurement system assigned to the process valve, and c) analyzing the process actual data (s) dependent on the process set data (S) by comparing the process set data (S) and the process actual data (s) with each other to detect defined error states.

Abstract: A pneumatic drive and a method for acquiring the power of a pneumatic drive are specified. A piston is movably disposed in a working space and coupled to a path transducer. A pressure sensor is provided for acquiring an internal pressure of the working space. An evaluation unit of the pneumatic drive is adapted to process the value of a path distance of a movement of the piston acquired by the path transducer as well as a variation of the internal pressure in the working space acquired by the pressure sensor. The variation of the internal pressure is associated with the movement of the piston in the working space. Based on these values, a power of the pneumatic drive can be determined.

Abstract: A pneumatic drive and a method for acquiring the power of a pneumatic drive are specified. A piston is movably disposed in a working space and coupled to a path transducer. A pressure sensor is provided for acquiring an internal pressure of the working space. An evaluation unit of the pneumatic drive is adapted to process the value of a path distance of a movement of the piston acquired by the path transducer as well as a variation of the internal pressure in the working space acquired by the pressure sensor. The variation of the internal pressure is associated with the movement of the piston in the working space. Based on these values, a power of the pneumatic drive can be determined.