Direct Reading Ferrography

Equipment Particle Analysis using precision magnets to strip iron-laden and other susceptible particles from a used lube oil for study; results indicate extent of equipment wear rate and likelihood of imminent failure.  This testing is commonly called "ferrography',  "wear particle analysis" or "equipment condition monitoring".

Direct-Reading (DR) Ferrography uses optical sensors to measure the density of particles collected and the ratio of large particles to small (fatigue-related catastrophic failure generally is characterized by generation of particles larger than 10-15 microns or um).  The DR obtains two-(2) sets of readings: first for Direct Large (D_L) >5um and the second for Direct Small (D_S) ≤5um  particles. The Wear Particle Concentration (WPC) is calculated by adding D_L + D_S = WPC divided by the volume of sample, establishing a machine wear trend baseline.  Other helpful particle calculations include:

1.	Wear Particle Concetration	(WPC)	DL + DS = WPC
2.	Percentage Large Particles	(PLP)
3.	Wear Severity Index	(WSI)	(DL + DS) (DL - DS) = WSI

 

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