BS 1704-1985 Specification for solid-stem general purpose thermometers《普通固体杆式温度计规范》.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/.513BS1704:1985 This British Standard, having been prepared under the directionof the Laboratory Apparatus Standards Committee,was published underthe author
2、ityof the BoardofBSIandcomes into effect on 28June1985 BSI 01-2000 First published February 1951 First revision June 1985 The following BSI references relate to the work on this standard: Committee reference LBC/4 Draft for comment 79/54294 DC ISBN 0 580 14258 2 Committees responsible for this Briti
3、sh 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 bodies were represented: British Laboratory Ware Association British Lampblown Scientific Glassware Manufacturers Associat
4、ion Ltd. British Medical Association Department of Health and Social Security Department of Trade and Industry (National Physical Laboratory) Institute of Petroleum Ministry of Defence Amendments issued since publication Amd. No. Date of issue CommentsBS1704:1985 BSI 01-2000 i Contents Page Committe
5、es responsible Inside front cover National foreword ii 0 Introduction 1 1 Scope and field of application 1 2 Reference 1 3 Temperature scale 1 4 Immersion 1 5 Glass 1 6 Liquid filling 2 7 Gas filling 2 8 Construction 2 9 Scale lines, immersion line and figuring 2 10 Accuracy 2 11 Inscriptions 3 Nati
6、onal appendix A Testing of British Standard thermometers 7 Figure Examples of scale lines and figuring 6 Table 1 Requirements for solid-stem general purpose thermometersformeasurements of lower accuracy 4 Table 2 Requirements for solid-stem general purpose thermometersformeasurements of higher accur
7、acy 5 Table 3 Uncertainty of test for certification of British Standard generalpurpose thermometers 7 Publication referred to 8BS1704:1985 ii BSI 01-2000 National foreword This British Standard has been prepared under the direction of the Laboratory Apparatus Standards Committee. This edition is ide
8、ntical with ISO1770:1981 “Solid-stem general purpose thermometers” published by the International Organization for Standardization (ISO) and incorporates a change to clause11 brought about by Amendment1 to ISO1770 issued in August1983. This standard supersedes BS1704:1951 which is withdrawn. The pri
9、ncipal differences between the1951 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 line thicknes
10、s. 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 identical with those
11、 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 to this standa
12、rd, they should be read as “British Standard”. Cross-reference. The reference to ISO386, which only appears in clause0, 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 information. Attentio
13、n is drawn to the requirement for marking in clause11 1) . 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 responsible for t
14、heir 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, pages1 to 8, an inside back cover and a back cover. This standard has been updated (s
15、ee copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. 1) Marking BS1704:1985 on or in relation to a product is a claim by the manufacturer that the product has been manufactured to the requirements of the standard. The a
16、ccuracy 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 Box375, Milton Keynes MK146LO for certification marks administer
17、ed by BSI or to the appropriate authority for other certification marks.BS1704:1985 BSI 01-2000 1 0 Introduction Although the thermometers covered by this International Standard are not intended for use in any specific test method, the overall lengths of the series of higher accuracy are specified w
18、ith 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 thermometer has been allocated a designation consisting of a single letter representing the range of the thermometer and the indication
19、“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, and which are in current use, are of a lower quality than those strictly covered in ISO386. Accordingly, whilst this Internationa
20、l 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 than0,8mm and the maximum error to be one scale division. In order to avoid increasing the cost of the thermometers, some of the dimensions recomm
21、ended to be specified in ISO386 have also been omitted. 1 Scope and field of application This International Standard specifies requirements for two series of inexpensive “commercial quality” liquid-in-glass thermometers of the solid-stem type suitable for general purpose use in industry, schools and
22、 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 which may not be acceptable for testing by a national verification laboratory; b) a series designated J to W of greater accuracy than
23、 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 covered by each series is from 100 C to +500 C. 2 Reference ISO 386, Liquid-in-glass laboratory thermometers Principles of design, cons
24、tructionand use. 3 Temperature scale The thermometers shall be graduated in accordance with the Celsius scale as defined in the current definition of the International Practical Temperature Scale (IPTS) adopted by the Confrence gnrale des poids et mesures, and in accordance with the International Sy
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