1、BRITISH STANDARD BS EN ISO 385:2005 Laboratory glassware Burettes The European Standard EN ISO 385:2005 has the status of a British Standard ICS 17.060; 71.040.20 BS EN ISO 385:2005 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 4 May 2005 B
2、SI 4 May 2005 ISBN 0 580 45991 8 National foreword This British Standard is the official English language version of EN ISO 385:2005. It is identical with ISO 385:2005. It supersedes BS 846:1985 which is withdrawn. The UK participation in its preparation was entrusted by Technical Committee LBI/36,
3、Laboratory glassware and related apparatus, to Subcommittee LBI/36/1, General and volumetric, glass and plastics apparatus, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards wh
4、ich implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This public
5、ation does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible internationa
6、l/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN ISO titl
7、e page, the EN ISO foreword page, the ISO title page, pages ii to iv, pages 1 to 12, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORM
8、EEUROPENNE EUROPISCHENORM ENISO385 April2005 ICS17.060;71.040.20 Englishversion LaboratoryglasswareBurettes(ISO385:2005) VerreriedelaboratoireBurettes(ISO385:2005) LaborgerteausGlasBretten(ISO385:2005) ThisEuropeanStandardwasapprovedbyCENon14April2005. CENmembersareboundtocomplywiththeCEN/CENELECInt
9、ernalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheCentralSecretariatortoanyCENmember. ThisEuropeanStandardexistsinthreeoff
10、icialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheCentralSecretariathasthesamestatusast heofficial versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,Cyprus,CzechRepublic,Denmark,Eston
11、ia,Finland,France, Germany,Greece,Hungary,Iceland,Ireland,Italy,Latvia,Lithuania,Luxembourg,Malta,Netherlands,Norway,Poland,Portugal, Slovakia, Slovenia,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCen
12、tre:ruedeStassart,36B1050Brussels 2005CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.ENISO385:2005:E Foreword This document (EN ISO 385:2005) has been prepared by Technical Committee ISO/TC 48 “Laboratory glassware and related apparatus“ in collabora
13、tion 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 identical text or by endorsement, at the latest by October 2005, and conflicting national sta
14、ndards shall be withdrawn at the latest by October 2005. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germ
15、any, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 385:2005 has been approved by CEN as EN ISO 385:2005 without any modificat
16、ions. ENISO385:2005 Reference number ISO 385:2005(E)INTERNATIONAL STANDARD ISO 385 First edition 2005-04-15 Laboratory glassware Burettes Verrerie de laboratoire Burettes ENISO385:2005ii ENISO385:2005 iiiContents Page Foreword iv 1 Scope 1 2 Normative references . 1 3 Terms and definitions. 1 4 Basi
17、s of adjustment 2 4.1 Unit of volume . 2 4.2 Delivery volume. 2 4.3 Reference temperature. 2 5 Types and classes of accuracy . 2 5.1 Classes of accuracy 2 5.2 Types of burette 2 6 Maximum permissible errors . 2 7 Material. 3 8 Construction 3 8.1 Dimensions 3 8.2 Top of burette 4 8.3 Stopcocks and si
18、milar devices 4 8.4 Stopcock leakage 5 8.5 Delivery jet . 5 8.6 Delivery time 5 8.7 Waiting time. 6 9 Graduation, figuring and patterns. 6 9.1 Graduating patterns 6 9.2 Position of graduation lines. 6 9.3 Marking of graduation lines . 6 10 Setting of the meniscus 6 11 Markings. 7 12 Visibility of gr
19、aduation lines, numbers and inscriptions 7 Annex A (normative) Burettes for which no waiting time is specified 8 Annex B (normative) Burettes for which a 30 s waiting time is specified 10 Bibliography . 12 ENISO385:2005iv Foreword ISO (the International Organization for Standardization) is a worldwi
20、de federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on tha
21、t committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in a
22、ccordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard re
23、quires 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 subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 385 was prepared by Technic
24、al Committee ISO/TC 48, Laboratory glassware and related apparatus, Subcommittee SC 6, Laboratory and volumetric ware. This first edition cancels and replaces ISO 385-1:1984, ISO 385-2:1984 and ISO 385-3:1984, which have been technically revised and combined into one document. ENISO385:2005 1Laborat
25、ory glassware Burettes 1 Scope This International Standard provides metrological and construction requirements for an internationally acceptable series of burettes, suitable for general laboratory purposes. The details specified are in accordance with the principles of design and construction of vol
26、umetric glassware given in ISO 384. NOTE For piston burettes, see ISO 8655-3. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the refe
27、renced 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 4787:1984, Laboratory glassware Volumetric glassware
28、 Methods for use and testing of capacity 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 delivery volume volume of liquid discharged from a volumetric instrument, such as a burette NOTE Due to retention of liquid on the inner surface of the v
29、olumetric instrument, the volume of liquid delivered is not identical with the volume of liquid contained by the volumetric instrument. 3.2 delivery time time required for the descent of the liquid meniscus from the zero line to the lowest graduation line of the volumetric instrument 3.3 waiting tim
30、e time to be observed after apparent completion of the liquid delivery of the volumetric instrument and before the final reading of the delivered volume is taken NOTE A waiting time applies for burettes Class AS (see 5.2). ENISO385:20052 4 Basis of adjustment 4.1 Unit of volume The basic unit of vol
31、ume shall be the millilitre (ml), which is equivalent to one cubic centimetre (cm 3 ). 4.2 Delivery volume Burettes shall be adjusted with water to deliver their volume (Ex), from the zero line to any graduation line, the outflow being unrestricted until approaching the final position of the meniscu
32、s. For burettes with a waiting time (Class AS), 30 s shall elapse before final setting of the meniscus. 4.3 Reference temperature The standard reference temperature, i.e. the temperature at which the burette is intended to deliver its nominal volume (nominal capacity), shall be 20 C. When the burett
33、e is required for use in a country which has adopted a standard reference temperature of 27 C (the alternative recommended in ISO 384 for tropical use), this value shall be substituted for 20 C. 5 Types and classes of accuracy 5.1 Classes of accuracy Two classes of accuracy are specified: Class A (s
34、ubdivided into Classes A and AS) for the higher grade; Class B for the lower grade. 5.2 Types of burette The following two types of burette are specified: that for which no waiting time is specified (Classes A and B); that for which a waiting time of 30 s is specified (Class AS). 6 Maximum permissib
35、le errors 6.1 Errors in the delivered volume shall not exceed the limits given in Table 1. These limits represent the maximum permitted error at any point on the scale, and also the maximum permissible difference between the errors at any two points. ENISO385:2005 3Table 1 Capacities, subdivisions a
36、nd maximum permissible error Maximum permissible error Nominal capacity Subdivision Classes A and AS Class B ml ml ml ml 1 0,01 0,006 0,01 2 0,01 0,01 0,02 5 0,01 0,01 0,02 5 0,02 0,01 0,02 10 0,02 0,02 0,05 10 0,05 0,03 0,05 25 0,05 0,03 0,05 25 0,10 0,05 0,10 50 0,10 0,05 0,10 100 0,20 0,10 0,20 6
37、.2 If burettes are required with nominal capacities and/or subdivisions other than those listed in Table 1, they shall conform to the essential requirements of this International Standard. The relationships between maximum permissible error and capacity, as well as between maximum permissible error
38、and meniscus diameter as given in ISO 384:1978, Annex A and Annex B, shall be observed. 7 Material Burettes shall be manufactured from glass of chemical resistance and thermal properties at least to HGB3 in accordance with ISO 719, shall be as free as possible from visible defects, and shall be free
39、 from internal stress. If the burette is of Schellbach tubing, the coloured stripe on the back of the burette shall be durable and shall not exceed 40 % of the circumference of the tube. NOTE The durability of coloured enamel stripes can be assessed by the test methods specified in ISO 4794. Some co
40、mponents of burettes may be manufactured from, or have components manufactured from, suitable inert materials such as ceramics or plastics (see 8.3). 8 Construction 8.1 Dimensions Burettes may be supplied with an auto-zero device and liquid storage reservoir. In this case the overall length of the b
41、urette when assembled to the reservoir should not exceed 1 050 mm. Burettes not provided with such a filling device shall comply with the dimensional requirements shown in Table 2. ENISO385:20054 Table 2 Dimensional requirements Nominal capacity Subdivision Scale length Overall length mm mm mm ml ml
42、 min. max. max. 1 0,01 150 200 575 2 0,01 200 300 650 5 0,01 480 600 820 5 0,02 250 600 800 10 0,02 480 600 820 10 0,05 250 450 620 25 0,05 480 600 820 25 0,10 250 450 620 50 0,10 500 600 820 100 0,20 550 650 870 Distance of zero line from top of burette: W 50 mm Distance of lowest graduation line f
43、rom top of stopcock: W 50 mm Length of tube of uniform bore below lowest graduation line: W 20 mm Distance of end of jet from underside of stopcock: W 50 mm 8.2 Top of burette The top of each burette, if not provided with a filling device, shall be smoothly finished with a strengthening flange or be
44、ad which shall lie in a plane at right angles to the axis of the burette. Burettes with subdivisions of 0,05 ml or less, if not fitted with a filling stopcock, should preferably be finished with a cylindrical cup at the top. Larger diameter burettes may be fitted with a funnel top for special purpos
45、es. The length of the tube of uniform bore between the zero graduation line and the cup shall be at least 20 mm. 8.3 Stopcocks and similar devices 8.3.1 Stopcocks shall be of good quality construction to allow smooth and precise control of outflow, and to prevent a rate of leakage greater than that
46、allowed by 8.4. Suitable key-retaining devices should be fitted. 8.3.2 Stopcocks of conventional design, made entirely of glass, shall have the barrel and key finely ground to a taper, usually of 1:10. 8.3.3 Stopcocks of other designs, whether glass or suitable inert alternative materials such as ce
47、ramics or plastics, are allowed provided they comply with the requirements of 8.3.1. 8.3.4 Stopcocks used on Class A and Class AS burettes should preferably be integral with the burette and have jets that form an integral part of the stopcock. If this is not the case, then for Class A and Class AS b
48、urettes each removable component shall be clearly identified to link it to the nominal burette tube size for which it is designed. For individually certified burettes, removable components shall clearly be identified (typically with a permanently inscribed or printed number) to link them to the individual burette. ENISO385:2005 58.4 Stopcock leakage 8.4.1 A stopcock of conventional design made entirely of glass or intended for use with grease shall be tested for leakage with the burette clamped in a vertic
