BS EN 207:2017 pdf download.Personal eye-protection equipment Filters and eye-protectors against laser radiation (laser eye-protectors).
This European Standard applies to eye-protectors used for protection against accidental exposure to laser radiation as defined in EN 60825-1:2007 in the spectral range 180 nm (0,18 urn) to 1 000 urn. It defines the requirements, test methods and marking.
A guide is given in the informative Annex B for the selection and use of laser eye-protectors and filters in appliances.
This European Standard does not apply to protectors for intentional exposure to laser radiation. EN 208 applies for laser adjustment eye-protectors.
Before selecting eye protection according to this European Standard, a risk assessment should first be undertaken (see Annex B).
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
3.5 Quality of material and surface of filters
3.5.1 Material and surface defects
The material and surface defects of filters shall be assessed in accordance with 4.6.1.
Except for a marginal area of 5 mm wide, filters shall be free from any material or surface defects likely to impair the intended use, such as bubbles, scratches, inclusions, dull spots, mould marks, scoring or other defects originating from the manufacturing process. No holes are allowed anywhere in the filters.
3.5.2 Diffusion of light
The reduced luminous coefficient j* of a filter, determined in accordance with 4.6.2, shall not be greater than
When tested in accordance with 4.8, the filters and frames shall not ignite or continue to glow.
3.8 Field of vision of eye-protectors
Eye-protectors shall have a clear field of vision of at least 400 in the vertical and horizontal directions
for each eye when measured in accordance with 4.9 (see Figure 1).
3.9 Construction of filters and frames
Filters shall be constructed so that when tested in accordance with 4.4 followed by a visual inspection no splinters are detached from the side of the filter facing the eye. lithe filters consist of several individual filters, they shall be assembled in such a way that they cannot be interchanged.
Filters shall not be interchangeable in the frame. An exception is possible if the protection to laser radiation is determined only by the filter(s) and no part of the frame lies inside the protected range as defined below. In this case the marking of the eye-protector shall be on the filter(s) and there is no requirement for the frame to satisfy 3.3 on resistance to laser radiation.
The frame shall be designed so that no laser radiation can penetrate from the side. This requirement is met if for the horizontal angle range a from – 500 (nasal side) to + 90° (temporal side) the vertical angle range is protected within the following limit angles in degrees (°).
The test shall be carried out in accordance with Clause 6 of EN 168:200 1, with the lamp running at a power of 450 W and an exposure time of (50 ± 0,2) h.
4.7.2 Stability to elevated temperature
Filters and eye-protectors shall be stored for at least 7 h in a climatic cabinet at a temperature of (55 ± 2) °C and a relative humidity of> 60 %, and then stored for at least 2 h at room temperature.
4.8 Resistance of filters and frames to ignition by contact with hot surfaces
The test shall be carried out in accordance with Clause 7 of EN 168:200 1.
4.9 Field of vision of eye-protectors
For measuring the field of vision, the test head specified in EN 168:200 1 with the eye-protector without filters shall be mounted as shown in the example of set up illustrated in Figure 1 so that the two axes of rotation A and B and the optical axis C intersect in the middle of the front surface of one eye. Irradiation is provided by a laser beam of diameter (1 ± 0,5) mm along axis C. When rotated around axis A, the.BS-EN-207-2017