Most mechanical failures are caused by mechanical wear. Among the failure forms of mechanical equipment components, metal abrasive particles account for over 70% of wear failures. The particles generated by wear in the equipment oil circuit can truly reflect the wear situation of the equipment. Lubricating oil debris reflects the health status of equipment and is also an important basis for diagnosing equipment faults and predicting equipment faults. The metal debris sensor adopts the principle of three-coil electromagnetic induction, integrates high-precision signal sampling and processing units internally, and combines built-in algorithms to achieve real-time detection of ferromagnetic and non ferromagnetic abrasive indicators in the oil circuit.