BS EN 207:2017 download free.Personal eye-protection equipment Filters and eye-protectors against laser radiation (laser eye-protectors).
1 Scope
BS EN 207 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 pm) to 1 000 pm. 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.
BS EN 207 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.
EN 166:200 1, Personal eye-protection -Specifications
EN 167:200 1, Personal eye-protection – Optical test methods
EN 168:200 1, Personal eye-protection – Non-optical test methods
EN 60825-1:2007, Safety of laser products – Part 1: Equipment classification and requirements (IEC 60825-1:2007)
I SO 11664-1:2007, Colorimet,y – Part 1: CJE standard calorimetric observers ISO 11664-2:2007, Colorimetiy- Part 2: C1E standard illuminants
3.7 Resistance of filters and frames to ignition by contact with hot surfaces
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 cx from – 50° (nasal side) to + 900 (temporal side) the vertical angle range fi is protected within the following limit angles in degrees (°).
The upward limit fl of the protected range shall be:
4.5 Refractive value of filters and eye-protectors
The test shall be carried out in accordance with Clause 3 of EN 167:2001.
4.6 Quality of material and surface of filters
4.6.1 Material and surface defects
The test shall be carried out in accordance with Clause 5 of EN 167:200 1.
Thin film filters should be carefully examined for defects (scratches and holes) as damage of deposited layer can affect protection against laser radiation.
4.6.2 Diffusion of light
The test shall be carried out in accordance with Clause 4 of EN 167:200 1.
If the simplified method cannot be used because the spectral transmittance is too low, the basic method shall be used.
4.7 Stability to UV radiation and stability to elevated temperature
4.7.1 Stability to UV radiation
The test shall be carried out in accordance with Clause 6 of EN 168:2001. 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
4.11 Frames
4.11.1 It shall be tested by means of manual and visual inspection whether the filters are interchangeable.
4.11.2 The test shall be carried out using the method given in 4.9. The zero values of the angles z and fi are reached when the axis A, B and C of the test apparatus are perpendicular to each other.
4.12 Mechanical strength
The test shall be carried out in accordance with Clause 4 of EN 168:200 1.
5 Information supplied by the manufacturer
In addition to the requirements of EN 166:200 1, Clause 10, the selection criteria and instructions for use shall contain at least the following:
a) luminous transmittance;
b) if the luminous transmittance is less than 20 %, this shall be indicated and the user shall be recommended to increase the intensity of Illumination at the workplace;
c) in the case of tinted and coloured filters a warning to the user that the recognition of warning lights or warning signals can be impaired;
d) the information that eye-protectors are only intended to give protection against accidental radiation and that both the limit values and the resistance tests are based on a maximum period of 5s;
e) a warning that eye-protectors and filters against laser radiation which have been damaged, have scratched oculars or which have undergone a colour change shall not be used anymore;
f) an explanation of the symbols used in the marking;
g) details regarding an appropriate cleaning method;
h) in case of filters with angle dependent transmittance an information shall be given that the protection is only provided for angles of incidence up to 300.
Instructions shall include a warning of risk of exposure to laser radiation due to reflection from reflective parts (including eye-protectors), tilting or misalignment of optical components.
Instructions shall include a recommendation that in areas where there is a risk of exposure to laser radiation appropriate eye-protection should be worn by all personnel.
In addition, the manufacturers shall supply additional data in the form of transmission curves.
6 Marking
6.1 Eye-protectors
The following shall be marked permanently on the filters or the frames for identification:
a) wavelength(s) or wavelength range (given in nanometres (nm)) in which the filter provides protection;
b) the symbol for the test condition (see Table 4);
c) scale number (see Table 1);
If the filter guarantees protection in one or several spectral ranges, the lowest scale number shall be given in the corresponding spectral range.
d) if the eye-protector is not tested with low repetition rates (25 Hz), the suffix Y shall be added to the scale number, e.g. RLB5Y;
e) manufacturer’s identification mark;
In order to prevent multiple use, only marks granted at European or national level shall be used.
1) if the eye-protector satisfies the mechanical strength requirement of 3.10.2, one of the marks specified in Clause 9 of EN 166:2001 shall also be added.
If the symbols are marked on the filters, they shall not impair vision nor the protective effect.