METHODS FOR PARTICLE COUNTING IN HYDRAULIC FLUIDS.
Rept. for Sep 61-Nov 63,
MONSANTO RESEARCH CORP DAYTON OHIO
Pagination or Media Count:
Four methods of sizing and counting particles in hydraulic fluids and lubricants were studied. The reproductibility of SAE Aeronautical Recommended Procedure No. 598 was established. Test results on three automatic particle counters the Cintel Flying Spot Resolver, the Coulter Counter, and the HIAC Particle Counter were evaluated against the ARP No. 598. Instrument theory and test methods are described. Design and construction of a simple but effective dustless area are given. Two of the automatic counters were found to give counts well within the prescribed precision 33 of the ARP No. 598. Numerical differences in counts on the same sample are attributable to the measurement of different physical properties by the various methods. Correlations between counts were made. Precision of the HIAC Counter was established, with standard deviations of 4.1 for the total count. 3.3 in the 6-15 micron range, and 11.2 in the 16-25 micron range. Author