Particle counting

Introduction to particle counting

Particle counting is a technique that is used for measuring particle size distributions and for counting the number of particles in a suspension. This technique is used for suspensions with a low content of particles, or when the total number of particles in the suspension is of interest. In cases with low content of particles, laser diffraction is not applicable for determination of particle sizes. Particle counting is done by light obscuration. The applied technique complies with Ph.Eur. 2.9.19 or USP <788>.

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Instrument and measuring principle

Particle counting measures the time a particles blocks the light when it passes a laser and this is used to count and size the particles. The particles are pumped through the laser path in a capillar tube so the suspension should be aqueous and must not contain large particles.

Technical info
Instrument Liquilaz E20P particle counter
Sample requirement Counts the number of particles in a suspension
Measuring range 2-125 µm
Sample amount Minimum 25mL for analysis by Ph.Eur. 2.9.19 or USP <788>..