1、BRITISH STANDARD BS EN ISO 4788:2005 Laboratory glassware Graduated measuring cylinders The European Standard EN ISO 4788:2005 has the status of a British Standard ICS 17.060 BS EN ISO 4788:2005 This British Standard was published under the authority of the Standards Policy and Strategy Committee on
2、 13 June 2005 BSI 13 June 2005 ISBN 0 580 46045 2 National foreword This British Standard is the official English language version of EN ISO 4788:2005. It is identical with ISO 4788:2005. It supersedes BS 604:1982 which is withdrawn. The UK participation in its preparation was entrusted by Technical
3、 Committee LBI/36, Laboratory glassware and related apparatus, to Subcommittee LBI/36/1, General present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European develo
4、pments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN ISO title page, the EN ISO foreword page, the ISO title page, pages ii to iv, pages 1 to 6, an inside back cover and a back cover. The BSI copyright notice displayed in this do
5、cument indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 4788 May 2005 ICS 17.060 English version Laboratory glassware - Graduated measuring cylinders (ISO 4788:2005) Verrerie de laboratoire
6、 - Eprouvettes gradues cylindriques (ISO 4788:2005) Laborgerte aus Glas - Messzylinder und Mischzylinder (ISO 4788:2005) This European Standard was approved by CEN on 29 April 2005. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving th
7、is European Standard the status of a national 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 (
8、English, French, German). A version in 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 official versions. CEN members are the national standards bodies of Austria, Belgium, Cyprus
9、, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN
10、 DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2005 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 4788:2005: EForeword This document (EN ISO 4788:2005) has been prepare
11、d by Technical Committee ISO/TC 48 “Laboratory glassware and related apparatus“ in collaboration with Technical Committee CEN/TC 332 “Laboratory equipment“, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an i
12、dentical text or by endorsement, at the latest by November 2005, and conflicting national standards shall be withdrawn at the latest by November 2005. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this Europe
13、an Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement not
14、ice The text of ISO 4788:2005 has been approved by CEN as EN ISO 4788:2005 without any modifications. EN ISO 4788:2005Reference number ISO 4788:2005(E) INTERNATIONAL STANDARD ISO 4788 Second edition 2005-05-01 Laboratory glassware Graduated measuring cylinders Verrerie de laboratoire prouvettes grad
15、ues cylindriques EN ISO 4788:2005ii EN ISO 4788:2005iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees
16、. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the Intern
17、ational Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Sta
18、ndards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subj
19、ect of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 4788 was prepared by Technical Committee ISO/TC 48, Laboratory glassware and related apparatus, Subcommittee SC 6, Laboratory and volumetric ware. This second edition cancels and replaces the f
20、irst edition (ISO 4788:1980), which has been technically revised to incorporate the following changes: a) three types of graduated measuring cylinders have been specified; b) two classes of accuracy have been introduced; c) cylinders of squat form have been added; d) marking of cylinders has been ch
21、anged; e) capacity at lowest graduation line for 5 ml and 10 ml cylinders has been increased. EN ISO 4788:2005iv Introduction The first edition of this International Standard (ISO 4788:1980) was originally written when the use of measuring cylinders was largely limited to the approximate dispensing
22、of reagents in wet chemical analytical procedures; only one grade of accuracy was specified. More recently, with the increasing demand for accreditation and changing uses to which measuring cylinders are put, a significant demand has emerged worldwide for a more accurate class to complement the orig
23、inally specified range. Also, with more work being carried out in laminar-flow cabinets, glove boxes and fume extraction hoods, in which working heights are restricted, a need for short (squat) measuring cylinders has emerged. This International Standard addresses these two needs, and has been prepa
24、red to meet the requirements of ISO 384. This International Standard includes a) spouted measuring cylinders of traditional (tall) form, accuracy classes A and B, b) stoppered measuring cylinders of traditional (tall) form, accuracy classes A and B, and c) spouted measuring cylinders of squat form,
25、accuracy class B. Class A has been considered for the third type (squat cylinders) but discounted because ISO 384 requirements would only be met by cylinders having manufacturing specifications which would be virtually impossible to satisfy. EN ISO 4788:20051 Laboratory glassware Graduated measuring
26、 cylinders 1 Scope This International Standard specifies dimensions, material and constructional and metrological requirements of graduated measuring cylinders of tall form (Type 1a and Type 1b) and of squat form (Type 2). All types are suitable for general laboratory use. The specifications in this
27、 International Standard are in conformity with the principles of design and construction of volumetric glassware given in ISO 384. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. F
28、or undated references, the latest edition of the referenced document (including any amendments) applies. ISO 384:1978, Laboratory glassware Principles of design and construction of volumetric glassware ISO 719, Glass Hydrolytic resistance of glass grains at 98 C Method of test and classification ISO
29、 4787, Laboratory glassware Volumetric glassware Methods for use and testing of capacity 3 Basis of adjustment 3.1 Unit of volume The unit of volume shall be the millilitre (ml), which is equivalent to the cubic centimetre (cm 3 ). 3.2 Reference temperature The standard reference temperature, i.e. t
30、he temperature at which the cylinder is intended to contain its nominal capacity, shall be 20 C. When the cylinder is required for use in a country which has adopted a standard reference temperature of 27 C; however, this value shall be substituted for 20 C. EN ISO 4788:20052 4 Types and classes of
31、accuracy 4.1 Types The following three types of graduated measuring cylinders are specified (see Figure 1): a) tall form with spouted neck Type 1a; b) tall form with stoppered neck Type 1b; c) squat form with spouted neck Type 2. a) Type 1a, Class B b) Type 1b, Class B c) Type 2 Key h 1overall heigh
32、t h 2internal height to highest graduation line 1 hexagonal or circular base Figure 1 General forms of graduated measuring cylinders 4.2 Classes of accuracy Two classes of accuracy are specified: a) Class A for the higher grade (Type 1a and Type 1b only); b) Class B for the lower grade. EN ISO 4788:
33、20053 5 Series of capacities and dimensions The three types of cylinder shall have a series of nominal capacities as shown in Table 1 and Table 2. If cylinders of capacities other than those listed below are required, it is recommended that they conform, as far as possible, to the essential requirem
34、ents of this International Standard. Table 1 Dimensions, subdivisions and limits of error for Type 1 (a and b) cylinders Nominal capacity Overall height Distance from top of scale to top of cylinder Internal height to highest graduation line Sub- divisions Capacity at lowest graduation line Max. per
35、missible error h 1 h 2 ml ml mm max. mm min. mm min. ml ml max. Class A Class B 5 115 20 55 0,1 1,0 0,05 0,1 10 140 20 65 0,2 1,4 0,1 0,2 25 170 25 85 0,5 2,5 0,25 0,5 50 200 30 110 1 5 0,5 1 100 260 35 145 1 10 0,5 1 250 335 40 200 2 26 1 2 500 390 45 250 5 50 2,5 5 1000 470 50 310 10 100 5 10 2000
36、 570 50 380 20 200 10 20 Table 2 Dimensions, subdivisions and limits of error for Type 2 cylinders Nominal capacity Overall height Distance from top of scale to top of cylinder Internal height to highest graduation line Sub- divisions Capacity at lowest graduation line Max. permissible error a h 1 h
37、 2ml mm max. mm min. mm min. ml ml max. ml 5 80 25 30 0,5 1 0,2 10 100 30 40 1 2 0,3 25 125 30 65 1 5 0,5 50 150 30 90 1 or 2 10 1 100 170 35 90 2 12 1 250 220 35 125 5 30 2 500 255 50 160 10 60 5 1000 295 50 190 20 100 10 2000 345 50 240 50 200 20 aThese maximum permissible errors correspond to acc
38、uracy Class B in accordance with ISO 384. 6 Definition of capacity The capacity of a graduated measuring cylinder is defined as the volume of water at 20 C, expressed in millilitres, contained by the cylinder when filled to the highest graduation line. Where, exceptionally, the reference temperature
39、 is 27 C, this value shall be substituted for 20 C. Setting the meniscus shall be performed according to ISO 4787. The meniscus is set so that the plane of the top edge of the graduation line is horizontally tangential to the lowest point of the meniscus, the line of sight being in the same plane. E
40、N ISO 4788:20054 7 Maximum permissible error Maximum permissible errors in capacity shall not exceed the values specified in Table 1 for Type 1 cylinders, and in Table 2 for Type 2 cylinders. These errors represent the maximum permissible error at any point on the scale, and also the maximum permiss
41、ible difference between the errors at any two points. 8 Material The cylinders shall be manufactured from glass of hydrolytic class not lower than HGB3 in accordance with ISO 719. The glass shall be as free as possible from visible defects, and steps shall be taken in manufacture to ensure that it i
42、s reasonably free from internal stress. 9 Construction and form 9.1 Wall thickness The cylinders shall be sufficiently robust in construction to withstand usual laboratory usage, and the wall thickness shall show no gross departure from uniformity. 9.2 Stability The cylinders shall stand vertically
43、without rocking or spinning when placed on a level surface. They shall not topple when placed empty (without stopper, if provided) on a surface inclined at an angle of 15 to the horizontal. 9.3 Base The base may be integral, of glass, or it may be detachable, of a suitable plastics or other material
44、, and may be either hexagonal or of other form provided the cylinder satisfies the requirements of 9.2. 9.4 Rim and spout 9.4.1 The rim of the cylinder shall be fire-polished and shall lie in a plane at right angles to the axis of the cylinder. 9.4.2 The spout of a Type 1a spouted cylinder shall be
45、so formed as to enable the contents of the cylinder to be poured out in a narrow stream without spilling or running down the outside of the cylinder. 9.5 Neck and stopper On a Type 1b stoppered cylinder, the neck shall be ground to a suitable socket size, preferably selected from ISO 383. A well-fit
46、ting stopper of glass or suitable inert plastics material shall be supplied. If individually ground stoppers are supplied, each stopper, and the cylinder it fits, shall be marked with an identification number. 9.6 Dimensions Type 1 (a and b) cylinders shall comply with the dimensional requirements g
47、iven in Table 1. In the case of a stoppered cylinder, the “overall height” shall be considered to be the height to the base of the ground neck (see Figure 1, Type 1b). Type 2 cylinders shall comply with the dimensional requirements given in Table 2. EN ISO 4788:20055 10 Graduation and figuring 10.1
48、Graduation The graduation of all cylinders within this specification shall be in accordance with ISO 384:1978, Clause 9, Graduation pattern II in the case of Class A cylinders and Graduation pattern III in the cases of Class B and Type 2 measuring cylinders. 10.2 Figuring Figuring shall be in accord
49、ance with ISO 384:1978, 10.4. 11 Accuracy testing Testing of capacity and accuracy shall be performed in accordance with ISO 4787. 12 Marking 12.1 The following shall be permanently marked on each cylinder: a) number indicating the nominal capacity; b) the symbol “ml” or “cm 3 ” to indicate the unit of volume; The 1 000 ml and 2 000 ml cylinders may, if desired, be inscribed in terms of the litre in place of the millilitre. c) the inscription “2
