Electrical sensing zone

Different methods are available for the determination of the particle-size distribution of powdered solids [30]. These are optical microscopy (usually combined with image analysis), sieve analysis, laser light scattering of suspended particles, and electrical zone sensing. 

Electrical zone sensing counters such as the Coulter counter (Coulter Electronics, Hialeah, Fla.) and the Elzone (Particle Data, Inc., Elmhurst, 111.) can analyze particles in the range of about 1200 to 0.4 /am. To cover this range,... 

The best candidates for electrical zone sensing analysis are those powders which can be easily dispersed in the electrolyte and do not readily agglomerate thus, high particle loading in the dispersion should be avoided. The occurrence... 

Electrical zone sensing 0.4pm-1200pm Coulter Model ZM, Coulter multisizer... 

Washington C., Electrical zone sensing, in Particle Size Analysis in Pharmaceutics and Other Industries, Ellis Horwood, New York, 1992, 79. 

Induction periods are often measured visually, but a different result can be recorded if new crystalline matter in the system is detected by more sensitive means, e.g. by laser light scattering or electric zone sensing methods... 

Both image analysis and electrical zone sensing observe and respond to each particle. Laser diffraction, sedimentation, and dynamic light scattering data are obtained from ensembles of dispersed particles in suspension. 

Figure 4 Electrical zone sensing (Coulter counter).

---