Aerosol Particle Size Spectrometer - Model LAP 322 -Particle Size and Concentration Measurement

• Measuring range of particle size: 200 nm … 40 µm (with just one sensor), various measuring ranges selectable
• Wide concentration range: from 1 to max. 104 particles/cm3) – ideal for filter testing
• Easy and defined extension of concentration measuring range by use of Aerosol Dilution Systems
• Optimized measuring zone:
• no border zone –> no border zone error
• vertical flow guiding ensures the transportation of large particles to the measuring zone
• High counting efficiency of >50% already at 200nm
• Light source with long life time (20,000 h) by use of approved laser diode
• Very good size resolution by means of multi channel analysis with typically >90 size channels
• Mobile and flexible –  both sensor and signal acquisition combined in a compact housing
• Incl. ease of use and comprehensive Windows based Control and Analysis Software PASWin
• Easy control of Sample Switching Unit SYS 520 for measurement of fractional efficiencies

• Measurement of particle size distributions (spray, dust, powder)
• Filter testing and characterization
• Determination of fractional efficiency
• Indoor air quality
• Atmospheric research and environmental monitoring
• Characterization of pharmaceutical aerosols
• Aerosol research

• Measuring size range 0,2-40um , (O^-Sum.O.S-TOum)
• Concentration range : <104Partikel/cms
• Size classes : max. 128 (64) or user-defined
• Volume flow : 3l/min
• Light source : 30mW laser diode 632, 8nm
• Interface : RS232
• Power supply : 110..230VAC  12VDC4.2A
• Dimensions : 220mmx380mmx200mm
• Weight : 9,4kg

The aerosol spectrometer underlies the principle of light scattering. According to size of a particle passing the measuring volume scattered light occurs that is mapped on photo detector situated in 90° direction. Change of collected light at the photo detector is a measure of particle size and is subject to multi channel analysis.

The counting results that are sorted into several channels according to their impulse height represent the basis for determining of number based particle size distribution by means of calculation base and calibration function.

The entire measuring range covers particle sizes from 0.2 µm to 40 µm. It has been proved that only at number concentrations higher than 104particle/cm3 noticeable losses in the counting rate are caused by coincidence. By using Topas dilution systems of series DIL the concentration range can reliably be enhanced and coincidence can be reduced to an insignificant scale.
The compact design and easy operation allow flexible utilization of aerosol spectrometers of series LAP for measuring particle size distribution as well as particle concentration in aerosols.