Signal processing technique which separates signal components in a sensor signal for sensor diagnostics

摘要

A device (40) in the process control system (2) includes a sensor input receiving a sensor signal. The sensor signal comprises a process variable signal and a residual sensor signal related to sensor operation. Diagnostic circuitry (12) receives a separated sensor signal and responsively provides a diagnostic output related to the sensor (20). Sensor signal processing circuitry (14) separates the sensor signal into signal components which are provided to the diagnostic circuitry (12).