Figure F4. A. Layout of the laser particle sizer "Analysette 22"-Economy (Fritsch GmbH Laborgerätebau, 1994). The unit is equipped with a 632.8-nm wavelength and 3-mW helium-neon laser and handles suspensions with a particle size between 0.1 and 600 µm. B, C. The unique fixed focus size analyzing system with particle size range-dependent cell shift. Shifting the sampling cell relative to the detector changes the diffraction angle and the size of the sensor area affected. A large distance between sampling cell and detector therefore permits the measurement of larger particles with a smaller diffraction angle, and short distances are used for small particles with a wide diffraction angle.