BS EN 137:2006 pdf download.Respiratory protective devices— Self-containedopen-circuitcompressed air breathing apparatus with full face mask —Requirements, testing,marking.
The apparatus shall cperate trouble-free over the termperature range of -30 "C to 60 "C.
Apparalus specilieally designed lor lernperalures beycrd lhese lrnis shall be lesled and the lermparalure(s) shallbe marked on the apparatus.
Apparatus shall meet the breathing resistance requirements given in 6.11.1.2 and 6.11.1.3 at the extremes of thetcmpcraturc rangc given.
6.11.1.2 Braathing resistance at low temperatures
For breathing apparatus without positive pressure the inhalation resistance shall not exceed 10 nbar.
For braathing apparatus with positve pressure a positive pressure shall be maintained in tha cavity of the mask.ecjacent to the face seel.
The exhalation resistance of all types of apparatus shall not excesd 10 mbar.Testing shall be done in accordance with 7.4.1.1.
6.11.1.3 Breathlng reslstance at hlgh temperature
6.11.1.3.1Apparatus without positive pressura
For breathing apparatus without posithve pressure the inhalation resistance shall not exceed 7 mbar.The exhalation resistance shall not axcead 3 nbar.
Testing shall be done in accordance with 7.4.1.2.
6.11.1.3.2Apparatus with positive pressure
For breathing apparatus with posithve pressure a positive pressure shal be meintained in the cavity of the meskadjacent to the face seal.
The exhalatian resistance shall not exceed 10m bar.
Testing shall be done in accordance with 7.4.1.2.
