BS EN 208:2009 pdf free download – Personal eye- protection一Eye- protectors for adjustment work on lasers and laser systems (laser adjustment eye- protectors).
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 EN 167:2001, Clause 5.
NOTE Thin film filters should be carefully examined for defects (scratches, 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 EN 167:2001, Clause 4.
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 EN 168:2001, Clause 7.
4.9 Field of vision of eye-protectors
The test shall be carried out in accordance with 4.9 of EN 207:2009.
4.10 Determination of the protected range
Using the apparatus as given in EN 207:2009, 4.9 the scan shall verify that the eye-protector covers at least the range as defined by the limits /3 and f3.
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 aand 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 EN 168:2001, Clause 4.
b) information that the eye-protector is not intended to be used for looking directly into the beam;
c) the information that eye-protectors are only intended to give protection against accidental exposure to laser radiation and the user shall perform active aversion response, if glare caused by the laser beam is noticed;
d) details regarding an appropriate cleaning method;
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 any more;
f) the value for the luminous transmittance. 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;
g) in the case of tinted and coloured filters a warning that the recognition of warning lights or warning signals can be impaired;
h) an explanation of the symbols used in the marking;
i) a warning, that hazards may arise because of accidental reflection of laser radiation, e.g. by reflection from reflective parts (including eye-protectors), tilting or misalignment of optical components. All personnel working in these areas shall wear eye-protectors;
j) 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 30°.
6 Marking
The following shall be marked permanently on the filters or frames for identification:
a) maximum laser power in Watt (W) and maximum pulse energy in joules (J) for which the filters provide protection;
b) wavelength or wavelength range, in nanometres (nm), for which the eye-protector is specified;
c) scale number.