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Sub-micron sizing in 60 seconds. Now you c a n measure t h e a v e r a g e size of particles in t h e 0.003 - 3 g m range or t h e molecular w e i g h t from 103 -10 1 0 DALTONS. In just 60 seconds. I n d e p e n d e n t of particle shape, structure, refractive index or relative density. The COULTER® Model N4 'Sub-Micron Particle Analyzer' determines particle size by measuring t h e particles' Brownian motion, w h i c h is directly proportional t o particle size. Since N4 measurements are b a s e d o n physical law, results are absolute a n d reproducible. The Model N4 is simple t o o p e r a t e a n d requires no calibration. In a d d i t i o n t o particle size, t h e w i d t h of t h e particle size distribution is reported as t h e standard deviation in nanometers diameter, diffusion coefficient as cm 2 /sec, a n d the display of t h e fitted size distribution. Results are a u t o m a t i c a l l y c a l c u l a t e d by a built-in microprocessor w h i c h also monitors instrument performance, t e m p e r a t u r e control a n d sending d a t a via a n RS232 interface. For more information o n w h a t t h e COULTER® M o d e l N4 c a n d o for you, call t h e Coulter or Curtin Matheson Scientific office nearest you.
Coulter... Quality Counts.
COULTER ELECTRONICS, INC. 590 West Twentieth Street Hialeah. FL 33010 1-800-327-6531, Ext. 382
CIRCLE 36 ON READER SERVICE CARD
ANALYTICAL CHEMISTRY, VOL. 54, NO. 13, NOVEMBER 1982 · 1391 A
