BS 1704-1985 ISO 1770-1981.pdf
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1、BRITISH STANDARD BS 1704:1985 ISO 1770:1981 Incorporating Amendment No. 1 Specification for Solid-stem general purpose thermometers UDC 536.512/.513 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 05:59:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1704:1985 This British Standard, having b
2、een prepared under the direction of the Laboratory Apparatus Standards Committee, was published under the authority of the Board of BSI and comes into effect on 28 June 1985 BSI 01-2000 First published February 1951 First revision June 1985 The following BSI references relate to the work on this sta
3、ndard: Committee reference LBC/4 Draft for comment 79/54294 DC ISBN 0 580 14258 2 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Laboratory Apparatus Standards Committee (LBC/-) to Technical Committee LBC/4, upon which the following bod
4、ies were represented: British Laboratory Ware Association British Lampblown Scientific Glassware Manufacturers Association Ltd. British Medical Association Department of Health and Social Security Department of Trade and Industry (National Physical Laboratory) Institute of Petroleum Ministry of Defe
5、nce Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 05:59:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1704:1985 BSI 01-2000i Contents Page Committees responsibleInside front cover National forewordii 0Introduction1 1Scope
6、and field of application1 2Reference1 3Temperature scale1 4Immersion1 5Glass1 6Liquid filling2 7Gas filling2 8Construction2 9Scale lines, immersion line and figuring2 10Accuracy2 11Inscriptions3 National appendix A Testing of British Standard thermometers7 Figure Examples of scale lines and figuring
7、6 Table 1 Requirements for solid-stem general purpose thermometers for measurements of lower accuracy4 Table 2 Requirements for solid-stem general purpose thermometers for measurements of higher accuracy5 Table 3 Uncertainty of test for certification of British Standard general purpose thermometers7
8、 Publication referred to8 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 05:59:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1704:1985 ii BSI 01-2000 National foreword This British Standard has been prepared under the direction of the Laboratory Apparatus Standards Committee. This edition
9、 is identical with ISO 1770:1981 “Solid-stem general purpose thermometers” published by the International Organization for Standardization (ISO) and incorporates a change to clause 11 brought about by Amendment 1 to ISO 1770 issued in August 1983. This standard supersedes BS 1704:1951 which is withd
10、rawn. The principal differences between the 1951 edition and this edition include the introduction of a series of greater accuracy intended for possible testing by a national verification laboratory, the withdrawal of thermometers marked in Fahrenheit, and changes to the scale division, accuracy and
11、 line thickness. National appendix A gives details of testing of the thermometers J to W. Terminology and conventions. The text of the International Standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identi
12、cal with those used in British Standards; attention is drawn especially to the following. The comma has been used as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. Wherever the words “International Standard” appear, referring
13、to this standard, they should be read as “British Standard”. Cross-reference. The reference to ISO 386, which only appears in clause 0, is of an informative nature only and the lack at present of an equivalent British Standard therefore does not affect the validity of this standard. Additional infor
14、mation. Attention is drawn to the requirement for marking in clause 111). Certification. Attention is drawn to the certification facilities described on the inside back cover. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are re
15、sponsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 8, an inside back cover and a back cover. This standard has
16、 been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. 1) Marking BS 1704:1985 on or in relation to a product is a claim by the manufacturer that the product has been manufactured to the requirements of th
17、e standard. The accuracy of such a claim is therefore solely the manufacturers responsibility. Enquiries as to the availability of third party certification to support such claims should be addressed to the Director, Quality Assurance Division, BSI, PO Box 375, Milton Keynes MK14 6LO for certificati
18、on marks administered by BSI or to the appropriate authority for other certification marks. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 05:59:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1704:1985 BSI 01-20001 0 Introduction Although the thermometers covered by this International Stan
19、dard are not intended for use in any specific test method, the overall lengths of the series of higher accuracy are specified with a tolerance so as to provide a degree of interchangeability for any special apparatus into which the thermometers are incorporated. For ease of reference, each thermomet
20、er has been allocated a designation consisting of a single letter representing the range of the thermometer and the indication “TOTAL” or, for example, “75” relating to the intended immersion. Some of the thermometers described in the scope and field of application of this International Standard, an
21、d which are in current use, are of a lower quality than those strictly covered in ISO 386. Accordingly, whilst this International Standard is based on the provisions of ISO 386, it does not align with those which recommend the distance between consecutive scale lines to be greater than 0,8 mm and th
22、e maximum error to be one scale division. In order to avoid increasing the cost of the thermometers, some of the dimensions recommended to be specified in ISO 386 have also been omitted. 1 Scope and field of application This International Standard specifies requirements for two series of inexpensive
23、 “commercial quality” liquid-in-glass thermometers of the solid-stem type suitable for general purpose use in industry, schools and laboratories when great accuracy of measurement is not required: a) a series designated A to H, in which nominal ranges and maximum overall lengths are specified but wh
24、ich may not be acceptable for testing by a national verification laboratory; b) a series designated J to W of greater accuracy than in a) and with specified ranges and a tolerance on overall length, which may be acceptable for testing by a national verification laboratory. The temperature range cove
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