EN 269-1994 pdf download.Respiratory protective devices Powered fresh air hose breathing apparatus incorporating a hood Requirements, testing, marking.
6 Requirements
6.1 Materials
6.1.1 All materials used in the construction shall have adequate mechanical strength, durability and resistance to deterioration by heat.
6.1.2 Exposed parts of the apparatus i.e. those that may be subjected to impact during use of the apparatus, shall not be made of aluminium, magnesium, titanium or alloys containing such proportions of these metals as will, on impact, give rise to frictional sparks capable of igniting flammable gas mixtures.
6.1.3 Materials that may come into direct contact with the wearer’s skin or that may affect the quality of the breathed air shall not be known to be likely to cause skin irritation or any other adverse effect to health.
6.1.4 The finish of any part of the apparatus likely to be in contact with the wearer shall be free of sharp edges or burrs.
6.1.5 The requirements of 6.1.1, 6.1.2, 6.1.3 and 6.1.4 shall be assessed by visual inspection in accordance with 7.2.
6.2 Cleaning and disinfecting
The materials used shall withstand the cleaning and disinfecting agents and procedures recommended by the manufacturer.
Testing in accordance with 7.2.
6.3 Resistance to temperature
6.3.1 After storing in accordance with 7.3.1 and returning to room temperature the apparatus shall show no appreciable deformation or distortion of the lens(es) or visor and all performance requirements of this standard shall be met.
6.3.2 After storing in accordance with 7.3.1 the apparatus shall continue to operate satisfactorily as assessed by the procedures of 7.3.2 and 7.3.3.
6.3.3 Apparatus specifically designed for temperatures beyond the limits for storage or use given in 7.3.1 shall be tested and marked accordingly.
6.4 Inward leakage
The continuous flow valve (if fitted) in the “minimum flow” position shall permit the minimum flow specified by the manufacturer, when measured at the coupling to the hood and with the maximum stated length of air supply hose and filter(s) if fitted and the inward leakage shall not exceed an average of 0.5% of the inhaled air of any of the 10 test subjects in any of the test exercises when tested in accordance with 7.4.
6.5 Flammability
After beign tested in accordance with 7.5 all exposed components of the apparatus including the hood shall not continue to burn for more than 5 s after removal from the flame.
6.6 Practical performance test
When assessed in accordance with 7.6 the apparatus shall be such that it can be worn without avoidable discomfort, the wearers shall show no undue signs of strain attributable to wearing the apparatus, and it shall impede the wearer as little as possible when in a crouched position or when working in a confined space.
These tests serve the purpose of checking the equipment for imperfections that cannot be determined by the tests described elsewhere in this standard.
Where in the opinion of the test station approval is not granted because practical performance tests show the apparatus has imperfections related to wearer’s acceptance, the test station shall describe the test which revealed these imperfections. This will enable other test stations to duplicate the tests and assess the results thereof.
6.7 Connectors
6.7.1 General
Components of the apparatus shall be readily separated for cleaning, examining and testing.
All demountahie connections shall he readily connected and secured, where possible by hand. Any means of sealing shall be retained in position when the joints or couplings are disconnected during normal maintenance.
Testing in accordance with 7.2 and 7.6.
6.7.2 Couplings
The apparatus shall be constructed so that any twisting of the breathing hose or fresh air supply hose does not affect the fit or performance of the apparatus, or cause either hose to become disconnected. The design of the coupling shall be such as to prevent unintentional interruption of the air supply.
Testing in accordance with 7.2 and 7.6. 6.7.3 Strength of breathing hose connections When tested in accordance with 7.7, the connections of the breathing hose to the belt and to the hood shall withstand axially a force of 250 N for 10 s for class 2 and 50 N for 10 s for class I apparatus.
6.8 Connection between apparatus and hood The connection between the hood and the remainder of the apparatus may he achieved by a permanent or special type of connection or by a screw thread connection.EN 269-1994 pdf download.