BS EN 170:2002 pdf download
BS EN 170:2002 pdf download.Personal eye-protection一 Ultraviolet filters – Transmittance requirements and recommended use.
The other applicable requirements for these types of filters and the frames/mountings to which they axe intended to be fitted are given in EN 166.
GuKfance on the selection and use of these fillets are given in annex B.
NOTE The protective filters specified ii this standard are not suitable for the direct viewing of bright light sources like Xenon high-pressure arc lamps or for the direct or direct observation of an electric welding arc. For this purpose a welding filter as specified in EN 189 and with a scale number appropriate to the source being observed should by used.
2 Normative references
This European Standard incorporates by dated or undated reference, provisions I toni other publications. These normative references are cited at the appropriate places In the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of those publications apply to this European Standard only when incorporated in It by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments).
EN 165:1995, Personal eye-protection – Vocabulary.
EN 166. Per-serial eye-protection – Specilications.
EN 167, Personal eye-protection — Optical test methods.
ISO/GtE 10526:1999, CIE Standard lIt uminants for calorimetry.
ISO/GtE 10527:1991, CIE Standard colorimetric observers.
3 Terms and definitions
For the purposes of this European Standard, the terms and definitions given in EN 165:1995 apply.
4 Designation and identification
The complete table of numbering of filters is given in EN 166.
The marking of oculars and frame is described in EN 166.
The scale number of ultraviolet filters comprises the code number 2 and the shade number corresponding to the filter, from 1,2 to5(see Table 1).
5 RequIrements
5.1 General
The requirements of EN 1 bfi apply to ultraviofet tilters Only those requirements that are ditlereni trom or
supplement the EN 166 specifications are given in this European standard.
5.2 Transmittance requirements
The definitions of transmitiances are given in EN 165.
B.1 For the personal protection of the operator the flter must be mounted in a suitable eye protector. Eye protector types are described in EN 166.
B.2 For protection against ultraviolet radiation, fiters should be selected from those classied in Table B.1.
These filters can have a yellowish tinge which can modity colour perception.
B.3 For processes in which colour recognition is important, the use of UV filters with enhanced colour recognition is recommended.
B.4 Filters according to this standard are not suitable for direct viewing of bright light sources like Xenon high-pressure arc lamps or welding arcs. For this purpose welding filter according to EN 169 should be used.
B.5 The guldelines given in Table B.1 (typical applications) are not applicable to persons with photophobia or tothose under medical treatment that can increase the sensitity of the eyes to optical radiation.
C.1 Test report and uncertainty of measurement
Fo each of the required measurements performed in accordance with this standard, a corresponding estimate of the uncertainty of measurement should be evafuated,
This estimate of uncertainty should be applied and stated when reporting test results, in Order to enable the user of the test report to assess the rekability of the data.
The following protocol with regard to uncertainty of measurement should be applied to test results:
If the limit value for the particular test given in the standard, fall5 outsãde of the range of values calculated from the test data plus’minus the uncertainty U of measurement, then the result should be deemed to be a straightforward pass or fail (see Figures Ci and C 2).
