1、UDC 620179152.05 : 620.186 DEUTSCHE NORM June 1992 Non-destructive testing (IS0 5580 : 1985) English version of DIN EN 25 580 Minimum requirements for industrial radiographic illuminators DIN EN 25580 - This standard incorporates the English version of Is0 5580. Zerstrungsfreie Prfung; Betrachtungsg
2、erte fr die industrielle Radiographie; minimale Anforderungen (IS0 5580 : 1985) Supersedes DIN 54116 Part 1, October 1973 edition and DIN 54116 Part 2, December 1976 edition. European Standard EN 25 580 : 1992 has the status of a DIN Standard. A comma is used as the decimal marker: National foreword
3、 This standard has been published in accordance with a decision taken by CEN/TC 138 to adopt, without alteration, Inter- national Standard IS0 5580 as a European Standard. The responsible German body involved in the preparation of this standard was the Technical Committee Durchstrahlungsprfung und S
4、trahlenschutz of the NormenausschuB Materialpr- fung (Materials Testing Standards Committee). Previous editions DIN 54 116 Part 1 : 10.73; DIN 54 116 Part 2: 12.76. Amendments The October 1973 edition of DIN 54116 Part 1 and the December 1976 edition of DIN 54116 Part 2 have been superseded by IS0 5
5、580 (which only covers parts of both standards). international Patent Classification GO1 N21100 H O1 J 291 18 Eh comprises 5 pages. Beuth Verkg GmbH, Berlin, has the exclusive right of sale for German Standards (DIN-Normen). DIN EN 25 580 Eng/. Price group 6 05.93 Sales No. 1106 EUROPEAN STANDARD EN
6、 25 580 NORME EUROPENNE EUROPISCHE NORM April 1992 UDC 620.179.152.05 : 620.186 Descriptors: Non-destructive testing, industrial radiography, radiographic illuminators, equipment specifications, screens: Dis- play, luminance, divergence, lighting, optical measurements, marking. English version Non-d
7、estructive testing Minimum requirements (IS0 5580 : 1985) Industrial radiographic i I I um in ators Essais non destructifs; ngatoscopes utiliss en radiographie industrielle; exigences minimales (IS0 5580 : 1985) Zerstrungsfreie Prfung; Betrachtungs- gerate fr die industrielle Radiographie; minimale
8、Anforderungen (IS0 5580 : 1985) This European Standard was approved by CEN on 1992-03-27 and is identical to the IS0 Standard as referred to. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a nat
9、ional standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A ver- sion in
10、 any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the offi- cial versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece,
11、 Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, 8-1050 Brussels 0 1992. Copyright rese
12、rved to all CEN members. Ref. No. EN 25 580 : 1992 E Page 2 EN 25 580 : 1992 Foreword In 1990, IS0 5580 : 1985 Non-destructive testing: industrial radiographic illuminators; minimum requirements was submitted to the CEN PQ procedure. Following the positive result of the PQ, CEN/BT agreed to submit I
13、S0 5580-1985, without modifications, to Formal Vote. in the countries bound to implement this European Standard, a national standard identical to this European Standard shall be published, and conflicting national standards withdrawn, by 1993-01 -31 at the latest. In accordance with the CENKENELEC I
14、nternal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of I
15、nternational Standard IS0 5580 : 1985 was approved by CEN as a European Standard without any modification. Page 3 EN 25 580 : 1992 1 Scope and field of application This International Standard specifies the minimum require- ments for industriel illuminators used for viewing radiographs. The function
16、of the illuminator is to allow the viewing of radiographs. The illuminator shall guarantee the same safety of personnel as an electric apparatus with maximum voltage, insulation and earthing which is required by corresponding safety standards of eiectrotechnics in each country where these are applie
17、d. 2 Characteristics of radiographic illuminators 2.1 Mechanical construction An illuminator consists of the housing with one of the sides being the viewing screen illuminated from the inside. This screen can itself be the diffusing screen. This housing may also contain a system for thermal protecti
18、on of the radiographs; this system may or may not be ventilated. For the viewing of wet radiographs, the illuminator shall be so designed as to prevent penetration of the liquid if the radiograph comes into contact with the screen. 2.2 Viewing screen The screens shall be easy to clean and shall be m
19、ade of a material which is resistant to scratching during cleaning pro- cesses recommended by the manufacturer and during film viewing. NOTE - The screen may be a combination of elements, all of which should be resistant to heat in terms of deformation and discoloration. The size of the screens shal
20、l allow the viewing of a radiograph without excessive glare reaching the eyes of the operator. Should the illuminator be used for viewing radiographs of dif- ferent sizes, a system of covering masks shall be provided. 2.3 Luminance The screen luminance required depends on the density of the radiogra
21、phs. The following luminance levels are recommended for the perception of information at various density levels. The luminance (or brightness) of the illuminated radiograph shall be not less than : - 30 cd/m2 for film densities 2,5 and, wherever possible, approximately 100 cd/mz or higher. These min
22、imum values require the following screen luminance : Film density I I Minimum screen luminance cd/m* 1 1.5 2 2.5 3 3.5 4 45 300 loo0 3000 10 o00 10 o00 moo0 loo o00 3ooOOo NOTE - The illuminator may be provided with a device for continuous control of screen luminance. 2.4 Colour of light The colour
23、of the light used to illuminate the radiograph is nor- mally white. However, in the case of a film with an emulsion type yielding a monocoloured image, light with adapted colours may be used if they have been recommended by the film manufacturers. 2.5 Diffusion of light If the illuminator has a diff
24、using screen, the light shall be suffi- ciently divergent so that both eyes of the observer receive rays from all parts of the screen. The diffusion factor g shall exceed 0.7 (see 3.1). 2.6 Uniformity of illumination The screen shall be uniformly illuminated, the uniformity factor g being higher tha
25、n 0,5 (see 3.2). 2.7 Disturbing light The housing, blinds and covering masks shall be constructed in such a manner that no disturbing light hinders the viewing of the radiographs (see clause 3). Page 4 EN 25 580 : 1992 2.8 Anti-glare device Each illuminator shall be fitted with an anti-glare device
26、which, by manual or automatic operation, prevents the operator from being subjected to excessive glare when the radiograph is removed. 2.9 Heating Appropriate precautions shall be taken to ensure that the temperature of the housing does not exceed 60 OC at the usual contact surfaces after 1 h of int
27、ermittent operation (50 % switched on with maximum of 15 s duration at an ambient temperature of 20 OC). Further precautions shall be taken to ensure that a radiograph of density 2 does not warp after a con- tinuous viewing time of 1 min and 1 h of intermittent operation of the illuminator. 3 Determ
28、ination of certain characteristics All photometric measurements shall be carried out in a dark room. The luminance meter has to be used in the middle part of its measuring scale. Moreover, light escaping from the illumi- nator even when the viewing screen is completely masked shall not affect the me
29、asurements. 3.1 Divergence and dispersion of light (of diffusing screens) The luminance shall be measured on a semi-circle, the centre of which is the centre of the screen and the diameter of which is approximately the same as the maximum dimension of the screen, but at least 50 cm. The luminance sh
30、all be measured with the aid of an appropriate luminance meter, the sensitive surface of which is a tangent to the curve of the circle (see the figure). Figure - Light luminance measurement Page 5 EN 25 580 : 1992 These measurements shall be made at angles of 45O (Le), 20 (Lm) and 5O (L5) related to
31、 the normal. The diffusion factor o shall be calculated according to the formula The measurements shall be made successively in both senses of rotation. 3.2 Uniformity of screen luminance The measurements shall be made with the aid of an illumination photometer or other suitable instrument. If the s
32、creen is rec- tangular, it shall be divided into squares, each side of the squares measuring 3,5 cm, the luminance of each being measured separately. If the screen is circular, the same basic procedure shall be followed. In both cases, the network of the squares shall be so arranged that the middle
33、square is centred in the middle of the screen. The average of the four highest and the average of the four lowest results shall be found, which give the average arithmeti- cal values of the luminance Lmax and LmiW The uniformity factor g shall then be calculated according to the formula L max 3.3 No
34、minal power consumption The nominal power consumption is the number of watts being consumed by the illuminator after it has been in continuous operation at full luminance for a minimum period of 30 min. 4 Marking A plate which is attached to the illuminator shall give the following information : a)
35、nominal operating voltage or permissible voltage range; b) nominal main frequency or permissible frequency range; c) whether for use with both direct and alternating current or only with one or the other; d) nominal power consumption; e) maximum luminance in candelas per square metre. 5 Recommendations for use Operating instructions shall be provided with each illuminator to indicate : a) the operation of the apparatus; b) instructions for the mounting and replacement of lamps and screens; c) care and maintenance; d) safety precautions; e) frequency of checking luminance levels.
