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FAS 362

Particle Counter for Liquids FAS 362 for analysis of particle size distributions and particle number concentrations in liquids

The Liquid Particle Counter FAS 362 is designed for measuring particle size distribution (PSD) and particle number concentration of particles in liquids.
Particle Counter for Liquids FAS 362 Particle Counter for Liquids FAS 362
Determining the mean extinction (attenuation) of the light due to single particles is an efficient optical measuring method to measure the particle size in a wide range. This method of single particle measurement is applied in the liquid particle counter FAS 362.

By means of competetive solutions this instrument is capable of measuring particle sizes with a high resolution and good reduction of the systematic measuring deviation. The complete detection of all particles present in the measuring volume is ensured even at high measuring concentrations.Detecting the extinction at a special angle to the measuring cell (sensor position) – according to ISO 21501-3 – reduces the influence of the particle material.

The comfortable software PASWin for controlling the instrument and analysing the measuring data enables easy use and flexible application.


ISO 21501-3
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  • wide range for particle concentration and particle size
  • minimal impact of optical material properties on the measurement result due to special designd optic
  • no assumption of a distribution function
  • flexible sampling system
  • fast, contactless optical analytical method


  • analysis of particle size distributions and concentrations in liquids
  • quality control of ultra pure water
  • characterisation of the separation efficiency of filters
  • flocculation analysis
  • analysis of biological systems

For the series FAS, the physical effect is used that an illuminated particle causes a definite light extinction (blockage) corresponding to its cross section and size, like described in ISO 21501-3. For this, the particle system is continuously streaming through a sensing zone inside a measuring cell. Particle concentration and measuring volume must be in such a relation that with high probability, the sensing zone contains only one particle at any time. Electrical pulses of the photo detector caused by single particles are amplified and classified by their height into different channels.

Parameter title Unit Value
measuring range, concentration #/cm³ max. 20000 (max. 5000)
measuring range, particle size µm 1 ... 100 (2 ... 200)
measurand(s) - particle size distribution, particle concentration
resolution, particle size - 64 size channels
resolution, measurement time s ≥ 1
volumetric flow rate, analysis L/min 0,01 (0,03)
power supply - 100 ... 260 V AC
weight kg 8,3 (sensor, sample feeding unit, tripod, signal processing unit)
  • carry case
  • balance for determination of analysed volume or volume flow, respectively, with additional serial interface and integration in software PASWin
  • peristaltic pump for continuous sampling or for low viscid liquids
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