Abstract: An actuator device for a process plant, such as a chemical, power, or food processing facility, includes a pneumatically operated control valve with an electrical actuator (e.g., I/P converter, solenoid valve, position controller, or drive) for performing a test function. At least one sensor verifies the test function and sends a signal describing the result. An electronic monitoring device, separate from the actuator, receives a trigger signal indicating when the test function starts and a functionally safe signal from the sensor. The device's electronic system monitors the relationship between the trigger and sensor signals to confirm correct operation.

Abstract: An actuator device for a process engineering plant, such as a chemical, power, or food processing plant, may include a pneumatically operated control valve with an electric actuator. The actuator, which may function as a drive or as part of a control or safety valve, can support the operating state(s) for executing a safety function, such as moving the valve to a defined safety position. The device may also include at least one sensor configured to detect the actuator's ability to perform the safety function and to transmit a corresponding signal. An electronic monitoring unit, which may be separate from the actuator, can feature a functionally safe output for triggering the actuator and a functionally safe input for receiving the sensor signal. The monitoring unit may be configured to assess the operational relationship between the received signal and the actuator's triggering to ensure reliable execution of the safety function.