What is the working principle of a fisher sub sieve sizer?201-5

What is the working principle of a fisher sub sieve sizer?201-5

Turn on HMK-22 Fisher Sub-Sieve Sizer, the air pump generates compressed air and the air passes air filter to filter out impurities, after constant pressure regulator, the air goes through the dryer made up of allochroic silicagel to dehydrate, then the air enters sample tube, after passing through the packed powder sample, part of compressed air enters manometer, read on the calculator chart average particle size (Fisher Number) according to the water level height in manometer, excessive air exits via high needle valve. There is void among tested particles, pressure drop △P is generated after passing the tested powders, when the mass of powder is fixed, the bigger the particle is, the bigger the void among particles is therefore more easily the air passes the powder and the smaller pressure drop is and the higher the manometer water level is and the bigger the size on the calculator chart is, vise versa. The obtained value is fisher number particle size, i.e. averaged particle diameter of surface area of tested powders.

HMK-22 Fisher sub sieve sizer

The Sub-Sieve Sizer operates on the air-permeability principle for measuring the average particle size of powders. The principle is based upon the fact that particles in the path of a regulated airflow will affect that airflow in relation to their size. More specifically, however, the principle finds its basis in the fact that a current of air flows more readily through a bed of coarse powder than through an otherwise equal bed of fine powder that is eaual in shape of bed, apparent volume, and percentage of voids; but by reason of difference in general coarseness of material (differing in average pore diameter and in total interstitial surface), measurements of average particle sizes are obtained.

Fiher Model 95 parts

After switching on the power of average particle size meter, the air pump starts to work. The compressed air passes through a filter to remove dust and impurities, and then stabilized by a voltage stabilizer, passes through a dryer composed of color-changing silica gel, the molecules in the compressed air are removed, and then the compressed air enters the sample tube. After passing through the measured powder, part of the compressed gas enters the u-shaped pressure gauge. The average particle size of the measured powder can be read on the HMK-22 Average Particle Size Meter reading board according to the water level height of the manometer. Excess gas is discharged through the high value needle valve.

fisher number

fisher scientific sub sieve sizer model 95 parts

HMK-22 Fisher Sub Sieve Sizer’s working principle is：

• Steady air flow pump produces a steady air flow.
• After stabilivolted by stabilivolt, the air is dried by the dryer and passes through the sample test area.
• The size of the powder determines the air permeability, which determines the height of the manometer level.
• The user can directly count the particle size of the powder from the reading board.

Fisher Sub Sieve Sizer https://www.labulk.com/hmk-22-fisher-sub-sieve-sizer/