Field device for process automation, has sensor element for generating control signal for controlling field device based on optical signal provided by control element, where optical signal is impinged on sensor element

摘要

The field device (1) has a sensor element (2) e.g. photodiode, for generating a control signal for controlling the field device, based on an optical signal provided by a control element (4) i.e. laser pointer, where the optical signal is impinged on the sensor element. An electronic unit (3) is controlled by the control signal, and the sensor element generates the control signal based on frequency of the optical signal. A sensor unit (6) detects and/or monitors a process parameter e.g. temperature, and a display unit (5) displays data.