DELTAPLUS - Main Catalogue Page 69
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Respiratory protection HELP WITH CHOICE Step 1: O2 or not O2? http://respiratory.deltaplus.eu Air is mainly composed of FILTERING* > 21% OXYGEN 19,5% O2? 78% NITROGEN INSULATING < * Except for : - strong hazardous substance - [ C ] > 2000 x OEL - no odor 19,5% 1% OTHER GAS Step 2: Identify the type of risk OEL Particles Aerosols OCCUPATIONAL EXPOSURE LIMIT P Mist Fume TWA Dust Gas vapours A B E STEL 1 WORKING DAY TIME WEIGHTED AVERAGE SHORT TERM EXPOSURE LIMIT Average exposure limit over an 8 hour time period Should not be longer than 15 minutes Should not occur more than 4 times per day with at least 60 minutes between exposures K Hg Vapours Gases Step 3: Concentration (in ppm or mg/m3) <2000 x OEL = FILTERING system PROTECTION FACTOR x 4 ))3ৰ PROTECTION FACTOR x 12 ))3ৱ NPF > [Concentration] >2000 x OEL = INSULATING system PROTECTION FACTOR x 50 ))3৲ NPF: Nominal Protection Factor means the level of protection tested in laboratory The Level of APF, Assigned Protection Factor, PLJKWEHGLↂHUHQWDFFRUGLQJORFDOUHJXODWLRQV PROTECTION FACTOR x 50 Half mask [C] OEL PROTECTION FACTOR x 2000 Full face mask P P P www.deltaplus.eu P P A B E K A B E K Hg 51
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