1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-23008-1 SANS 115:2009Edition 1 ISO 385:2005Edition 1SOUTH AFRICAN NATIONAL STANDARD Laboratory Glassware Burettes This national standard i
4、s the identical implementation of ISO 385:2005 and is adopted with the permission of the International Organization for Standardization. Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 Pretoria 0001Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS SANS
5、115:2009 Edition 1 ISO 385:2005 Edition 1 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Committee SABS TC 48, Laboratory Equipment in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT a
6、greement. This SANS document was published in September 2009. Reference numberISO 385:2005(E)ISO 2005INTERNATIONAL STANDARD ISO385First edition2005-04-15Laboratory glassware Burettes Verrerie de laboratoire Burettes SANS 115:2009This s tandard may only be used and printed by approved subscription an
7、d freemailing clients of the SABS .ISO 385:2005(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer
8、 performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobes licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create t
9、his PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Cen
10、tral Secretariat at the address given below. ISO 2005 The reproduction of the terms and definitions contained in this International Standard is permitted in teaching manuals, instruction booklets, technical publications and journals for strictly educational or implementation purposes. The conditions
11、 for such reproduction are: that no modifications are made to the terms and definitions; that such reproduction is not permitted for dictionaries or similar publications offered for sale; and that this International Standard is referenced as the source document. With the sole exceptions noted above,
12、 no other part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office C
13、ase postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2005 All rights reservedSANS 115:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 385
14、:2005(E) ISO 2005 All rights reserved iiiContents Page Foreword iv 1 Scope 1 2 Normative references . 1 3 Terms and definitions. 1 4 Basis 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 Type
15、s 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 similar 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
16、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 graduation 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 wait
17、ing time is specified 10 Bibliography . 12 SANS 115:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 385:2005(E) iv ISO 2005 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation
18、 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 that committee.
19、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 accordance wit
20、h 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 requires approv
21、al 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 Technical Committee
22、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. SANS 115:2009This s tandard may onl
23、y be used and printed by approved subscription and freemailing clients of the SABS .INTERNATIONAL STANDARD ISO 385:2005(E) ISO 2005 All rights reserved 1Laboratory glassware Burettes 1 Scope This International Standard provides metrological and construction requirements for an internationally accept
24、able series of burettes, suitable for general laboratory purposes. The details specified are in accordance with the principles of design and construction of volumetric glassware given in ISO 384. NOTE For piston burettes, see ISO 8655-3. 2 Normative references The following referenced documents are
25、indispensable for the application of this document. For dated references, only the edition cited applies. For 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 g
26、lassware ISO 719, Glass Hydrolytic resistance of glass grains at 98 C Method of test and classification ISO 4787:1984, Laboratory glassware Volumetric glassware Methods for use and testing of capacity 3 Terms and definitions For the purposes of this document, the following terms and definitions appl
27、y. 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 volumetric instrument, the volume of liquid delivered is not identical with the volume of liquid contained by the volumetric instrument. 3.2
28、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 time time to be observed after apparent completion of the liquid delivery of the volumetric instrument and before the final reading of the deli
29、vered volume is taken NOTE A waiting time applies for burettes Class AS (see 5.2). SANS 115:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 385:2005(E) 2 ISO 2005 All rights reserved4 Basis of adjustment 4.1 Unit of volume The basic u
30、nit of volume shall be the millilitre (ml), which is equivalent to one cubic centimetre (cm3). 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
31、 meniscus. 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 th
32、e burette 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: Cl
33、ass A (subdivided 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 p
34、ermissible 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. SANS 115:2009This s tandard may only be u
35、sed and printed by approved subscription and freemailing clients of the SABS .ISO 385:2005(E) ISO 2005 All rights reserved 3Table 1 Capacities, subdivisions and 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
36、,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 6.2 If burettes are required with nominal capacities and/or subdivisions other than those listed in Table 1, they shall conform to the essentia
37、l requirements of this International Standard. The relationships between maximum permissible error and capacity, as well as between maximum permissible error 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 o
38、f 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 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 e
39、xceed 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 components of burettes may be manufactured from, or have components manufactured from, suitable inert materials such as ceramics or plastics (se
40、e 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 burette when assembled to the reservoir should not exceed 1 050 mm. Burettes not provided with such a filling device shall comply with the dime
41、nsional requirements shown in Table 2. SANS 115:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 385:2005(E) 4 ISO 2005 All rights reservedTable 2 Dimensional requirements Nominal capacity Subdivision Scale length Overall length mm mm
42、mm ml ml 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 graduatio
43、n line from 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 flan
44、ge or bead 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 specia
45、l purposes. 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 th
46、an that 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 su
47、ch as ceramics 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 Cl
48、ass AS burettes 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
49、the individual burette. SANS 115:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 385:2005(E) ISO 2005 All rights reserved 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 vertical position, the stopcock free from grease, the barrel and key wetted with water, and the burette filled initial
