The monitoring of particle contamination in lubricating fluids is a critical indicator of incipient and impending failures. Recent research, under both laboratory and field conditions of the contaminant sensitivity of bearings, reveals a well defined cause and effect relationship between contaminant levels and relative machine life.

This paper discusses the contaminant sensitivity of bearings as well as turbines, diesel engines, gear systems, and hydraulic systems. Also discussed is the benefit of applying contaminant monitoring to both proactive and predictive maintenance programs. Proactive maintenance is the process of monitoring root causes (pre-degradation conditions) as opposed to predictive maintenance which focuses on impending failure conditions.

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