A gas turbine engine, a method, and a system for detecting oil debris are provided. The gas turbine engine includes an oil debris monitor sensor configured to detects oil debris in an oil flow, and generate a sensor signal based on the detected oil debris, a controller configured to control the oil flow through the oil debris monitor sensor using a plurality of valves, and a signal processor configured to receive the sensor signal from the oil debris monitor and to receive a valve system configuration from the controller, the signal processor further configured to generates a health indicator based on the sensor signal and valve configuration.