ASTM D7917-14

5.4.1 Can detect both ferromagnetic and non-ferromagnetic metallic wear debris.

5.4.2 Can detect 95 % or more of metallic wear debris above some minimum particle size threshold.

5.4.3 Can count and size wear debris detected.

5.4.4 Can provide total mass loss.

5.4.5 Can provide algorithms for RUL warnings and limits.

5.6.1 Firstly, bearing failures on rotating machines tend to occur as events often without sufficient warning and could be missed by means of only periodic inspections or data sampling observations.

5.6.2 Secondly, because larger wear metallic debris particles are being detected, there is a lower probability of false indication from the normal rubbing wear that will be associated with smaller particles. And because wear metal debris particles are larger than the filter media, detections are time correlated to wear events and not obscured by unfiltered small particles.

5.6.3 Thirdly, build or residual debris, from manufacturing or maintenance actions, can be differentiated from actual damage debris because the cumulative debris counts recorded due to the former tend to decrease, while those due to the latter tend to increase.

5.6.4 Fourthly, bearing failure tests have shown that wear debris size distribution is independent of bearing size (1.1 This practice covers the minimum requirements for an online inductive sensor system to monitor ferromagnetic and non-ferromagnetic metallic wear debris present in in-service lubricating fluids residing in gearboxes and drivetrains.

1.2 Metallic wear debris considered in this practice can range in size from 40 μm to greater than 1000 μm of equivalent spherical diameter (ESD).

1.3 This practice is suitable for use with the following lubricants: industrial gear oils, petroleum crankcase oils, polyalkylene glycol, polyol esters, and phosphate esters.

1.4 This practice is for metallic wear debris detection, not oil cleanliness.

1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.