Reliable validating of pure areas

A crucial condition for a reliable and economic acceptance or validating of clean-spacetechnical plants is the correct aerosol equipment. Final filters for pure areas are to be tested after EN 1822 with a test aerosol, whose maximum of the particle distribution sucked in. MP HP range (Most penetration Particle Size range) to lie is. Natural outside air can accept after the boy distribution within the MP HP range concentrations to 10 to the power of 9 per m³. The particle concentration and the particle size of outside air are different at different places, and they are likewise different at the same place at different times. Therefore for the fast and safe acceptance test by pure areas highly concentrated test aerosols are used. The concentrations of these test aerosols are with approx.. 10 to the power of 11 to 10 to the power of 14 per m³. The particle concentrations in the pure area are with approx.. 10 to 10 to the power of 5 per m³.Optical particle counters (OPC) are to measure the few events in the pure area fast and reliably. OPCs have therefore a large suction flow rate, z. B. 28.3 l/min.. The maximum measurable particle concentration of a "pure space counter" is with approx.. 10 to the power of 6 per ft³ and/or. 35 x 10 to the power of 6 per m³. For this reason for the measurement of outside air and for the characterisation by test aerosols so-called aerosol spectrometers are inserted, which can measure particle concentrations to 10 to the power of 11 per m³ undiluted. At these numerical examples it becomes clear that during the concentration regulation of the raw gas with so-called pure space counters dilution systems must be used. The aerosol generators of the company Palas® supply the desired narrow particle size spectrum and get thus not unnecessarily the filters dirty which can be tested. The Palas® Aerosolgeneratoren is clearly characterized for the different adjusting parameters.They are characterised by a high dosing Konstanz and a reproducible attitude. Also the Palas® Verduennungssysteme is characterised by the clear characterisation. For this reason they are also in the VDI recommendation 3491 Bl. 16 described. The Palas® Verduennungssysteme can be cascaded, whereby simply and reliably dilution factors can be realized from 10 to 100,000. With cascading locally a safe function test of the entire aerosol equipment can be accomplished. The Palas® Aerosolspektrometer possesses a clear calibration curve by the white source of light and the 90° scattered light detection and makes therefore measurements possible with high resolution and very good classifying accuracy. The Palas products worked satisfactorily in the world-wide employment. Sold numbers of items: Aerosol generators: approx.. 500 dilution systems: approx.. 1000 aerosol spectrometers: approx..140 further information receives you from the Palas® GmbH: mail@palas.de or info@dr lindenthal.de attendance it also our Website: www.palas.de literature /1/ EN 1822 /2/ clean-room technology, measuring technique in the pure room air, VDI 2083 sheet 3 /3/ methods for characterisation and monitoring of test aerosols, overview VDI 3489, Blatt1 /4/ optical particle counter, VDI 3489, sheet 3 /5/ methods for the production of test aerosols, VDI 3491, sheet 1-2 /6/ Gail, Lothar; Hortig, Hans-Peter: Clean-room technology, Berlin Heidelberg 2002