by. Frank Celio Bel INTRODUCTION AND SUMMARY e e" CALIBRATION OF THE ROLLER ANALYZER OOP TNT rea APPENTIX B Pam athe 1 ee oteom tee UNCLASSIFIED The Roller particle size analyzer,* Fig. Bl, was used to separate The Roller analyzer was used for the pare ‘ticle size separation of corel. (CaCO, density 2.3 g/cc) in the O-Lh j _ range, The Roller analyzer and the éalibration curves in the in- struction manual are designed for the size separation of spherical particles. Since the coral in question was not spherical, it was necessary to calibrate the instrument for the coral, Separation was achievedexperimentally with favorable and usable resuits in the fole lowing ranges: 0-5, 5-10, 10-20, 20-30, and 30-40 1. B.2 OPERATIONAL FUNCTION 1, The air is pumped from the air compressor to an oil filter and then proceeds to the capillary flowneter where the proper rate of flow is selected, ' 2, ‘Tuwee paper thimble filters connected in parallel are used . to remove any impurities in the alr, © 3. The air passes through the Laboratory Lectrodryer™ (an 5 he ee= mR RO tek OR A6 fn Heats By ee “Wo the particles under study, activated alumina system) in which it is dried to 3 per cent relative humidity at room temperature, he ‘A Drierite train is next in the system. When it turns a 5. The air is passed through the humidifying solution, which gives it a 25 per cent relative humidity at room temperature, : e It then passes through a water trap and flows directly to the sample in the glass tube. We Tnstroment for particle size separation made by the American OEY ITO pinkish color, the Lectrodryer must be reactivated, NCLASSEDSSID wer Instrument Company, Silver Spring, Maryland x*Manufactured by the Pittsburgh Lectrodryer Corporation, Pittsburgh, Pennsylvania