What is Coulter Counter Method for Powder Particle Size

       The Coulter counter method, also known as the electric field induction zone method, is based on the principle that a sample particle is suspended in an electrolyte, which is guided through an indicator hole and a voltage is applied across the cross section of the hole. As the particles flow through the orifice, the capacitance changes, generating a pulsed voltage, which is displayed, with an amplitude proportional to the volume of the particle flowing through it. This method is a relatively accurate and widely used method with good repeatability. However, accurate analysis is more difficult for samples with particularly broad particle size distributions. Because the principle of this method is that all the particles in the sample are required to be suspended in the electrolyte, and the sedimentation phenomenon cannot be caused by the large particles.