1、BRITISH STANDARD BS5470:1977 Specification for Glass alcohol hydrometers not incorporating a thermometer UDC 531.756.3:542.3:661.722BS5470:1977 This BritishStandard, having been prepared under the directionof the Laboratory Apparatus Standards Committee,was published underthe authority of the Execut
2、ive Board on 31March1977 BSI12-1999 The following BSI references relate to the work on this standard: Committee reference LBC/5 Draft for comment76/54389 ISBN 0 580 09822 2 Cooperating organizations The Laboratory Apparatus Standards Committee, under whose supervision this BritishStandard was prepar
3、ed, consists of representatives from the following Government departments and scientific, industrial and consumer organizations: Agricultural Research Council Association for Science Education Association of Technical, Scientific and Managerial Staffs British Laboratory Ware Association* British Lam
4、pblown Scientific Glassware Manufacturers Association Ltd* British Pharmacopoeia Commission* Chemical Industries Association* Chemical Society, Analytical Division Department of Health and Social Security Department of Industry, Laboratory of the Government Chemist* Department of Industry, National
5、Physical Laboratory Glass Manufacturers Federation Institute of Petroleum* Ministry of Defence Pharmaceutical Society of Great Britain Scientific Instrument Manufacturers Association Society of Chemical Industry Society of Glass Technology* Standardization of Tar Products Tests Committee The Governm
6、ent department and scientific and industrial organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this BritishStandard: Agricultural Education Association Royal Institute of Chemistry Scotch
7、 Whisky Association Wine and Spirit Association of Great Britain Amendments issued since publication Amd. No. Date of issue CommentsBS5470:1977 BSI 12-1999 i Contents Page Cooperating organizations Inside front cover Foreword ii 1 Scope and field of application 1 2 References 1 3 Basis of scales 1 4
8、 Description 1 5 Materials and workmanship 1 6 Scale 1 7 Graduation and numbering 2 8 Surface tension 2 9 Dimensions 2 10 Inscriptions 2 11 Accuracy and testing 2 12 Determination of temperature 2 Appendix A Testing of BritishStandard hydrometers 4 Figure 1 Style of graduation for alcohol hydrometer
9、s 3 Table 1 Density and surface tension 2 Publications referred to 6BS5470:1977 ii BSI 12-1999 Foreword This BritishStandard was published under the authority of the Laboratory Apparatus Standards Committee following consultations between Government departments, manufacturers and users of alcohol hy
10、drometers. It was prepared at the request of HM Customs and Excise in support of an intended statutory instrument to implement a Council Directive of the EEC 1) , and covers only those instruments which are expected to be used in the United Kingdom; it thus excludes alcoholometers (indicating streng
11、th as%m/m or%V/V, instruments incorporating a thermometer, and instruments of classI or classIII accuracy as defined in the EEC Directive. The requirements of this BritishStandard align with those of two draft International Standards for hydrometers, ISO/DIS387 2)and ISO/DIS4801 2) , insofar as they
12、 were known at the time of preparation. These International Standards were in course of preparation by Sub-committee4, Hydrometers, of ISO Technical Committee48, Laboratory glassware and related apparatus. The expression “graduation line” which appears in clauses6, 7 and9, and “datummark” which appe
13、ars in4.5 are internationally accepted terminology, and are equivalent to the expressions “scale mark” and “reference mark” respectively, used in the Directive. Information on the testing of the hydrometers is given in Appendix A. Certification. Attention is drawn to the certification facilities des
14、cribed on theinside back cover of this standard. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal oblig
15、ations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the i
16、nside front cover. 1) Council Directive of27 July1976,76/765/EEC on the approximation of the laws of the Member States relating to alcoholometers and alcohol hydrometers. 2) in course of preparation.BS5470:1977 BSI 12-1999 1 1 Scope and field of application This BritishStandard specifies the require
17、ments of instruments suitable for the accurate determination of the ethanol content of simple mixtures of ethanol and water. They are graduated in density(kg/m 3 ). One class of accuracy is specified. 2 References The titles of the publications referred to in this standard are listed on page 6. 3 Ba
18、sis of scales 3.1 The standard reference temperature for the instruments shall be20 C. 3.2 The instruments shall be graduated for reading at the level of the free horizontal surface of the liquid. 4 Description 4.1 Each instrument shall consist of a cylindrical body whose lower end is of such a form
19、, cone-shaped or hemispherical, as will effectively prevent the entrapment of air bubbles. 4.2 At its upper end the body shall be fused on to a hollow cylindrical stem. The top end of the stem shall be sealed. 4.3 The shape of the instrument shall be symmetrical about its longitudinal (vertical) axi
20、s. Its cross section shall not exhibit any abrupt variations. 4.4 The loading material for adjusting the mass of the instrument shall be contained in the lower part of the body. 4.5 The stem shall contain a graduated scale, marked on a cylindrical strip of suitable material (see6.2, 6.3 and6.4) whic
21、h shall be securely fastened to the interior of the stem. Datum marks shall be provided on the strip and on the stem in order that any displacement of the former relative to the latter would be readily apparent. 5 Materials and workmanship 5.1 The instrument shall be constructed from soda lime glass
22、 which shall be transparent, free from stress (i.e.properly annealed) and free from flaws such as would obscure or alter the reading of the scale. 5.2 The coefficient of cubical thermal expansion of the glass shall be(25 2) 10 6 C 1 . 5.3 The loading material shall be so fixed that after the finishe
23、d instrument has been kept in a horizontal position for1h at80 C and subsequently cooled to room temperature in that position, the instrument shall meet the requirements of5.4. Mercury shall not be used as the loading material. 5.4 The instrument shall float with its axis vertical to within1.5degree
24、s of arc. 5.5 There shall be no loose material in any part of the instrument. 6 Scale 6.1 The instrument shall not have more than one scale. 6.2 The scale and the inscriptions shall be marked on a strip having a smooth matt surface of white or off-white colour. The graduations within the nominal sca
25、le limits and the inscriptions shall be marked in black. Graduations outside the nominal scale limits (see6.9) may be marked in a colour other than black. 6.3 The strip bearing the scale shall be of cylindrical form, straight and free from twist. 6.4 The strip bearing the scale shall show no evidenc
26、e of charring. The strip shall not become discoloured or distorted when the stem is maintained for24h at a temperature of70 C. 6.5 The graduation lines shall lie in planes perpendicular to the axis of the stem. They shall be distinct and of uniform thickness not exceeding one-fifth of the distance b
27、etween the centres of adjacent graduation lines or0.2mm, whichever is less. 6.6 The short and long graduation lines shall extend, respectively, to at least one-fifth and one-half of the circumference of the stem. The long lines shall extend beyond the ends of the short lines (seeFigure 1). 6.7 There
28、 shall be no evident local irregularity in the spacing of the graduation lines. 6.8 The mean value of the scale spacing (i.e.distance between centres of adjacent graduation lines) shall be not less than1.05mm. 6.9 The nominal range of each instrument shall be20kg/m 3 . Each instrument shall carry5 t
29、o10 additional graduation lines beyond the nominal limits at both ends of its scale, except that there shall be no lines beyond1000kg/m 3 .BS5470:1977 2 BSI 12-1999 7 Graduation and numbering 7.1 Each graduation line corresponding to a whole unit ofkg/m 3shall be a long line. There shall be four sho
30、rt lines corresponding to0.2kg/m 3between two consecutive long lines. 7.2 All the long lines shall be numbered; with the exception of the nominal scale limits they may be partially numbered if required. The short lines shall not be numbered. 7.3 The numbers shall appear immediately above the long li
31、nes to which they refer and to the left of the short lines. 8 Surface tension In marking the graduation lines, the conventional values given in Table 1 shall be assumed for the surface tension at20 C of ethanol solutions of various concentrations. NOTEThe values given in Table 1 are based on values
32、adopted by the International Organization of Legal Metrology (OIML) and the International Organization for Standardization (ISO). 9 Dimensions 9.1 The total length of the instrument shall not exceed300mm. 9.2 The body diameter shall be382mm. 9.3 The volume below the lower nominal scale limit shall b
33、e110 15ml. 9.4 The stem diameter shall be not less than4mm. 9.5 The cross section of the stem shall remain unchanged for at least5mm below the lowest graduation line of the scale. 9.6 The stem shall extend by at least15mm above the uppermost graduation line of the scale. 10 Inscriptions The followin
34、g shall be legibly and indelibly marked inside each instrument. a) The basis of the scale and the standard temperature, i.e.kg/m 3 ,20 C. b) The word “ethanol”. c) The accuracy class of the instrument, i.e.classII. d) The makers name or readily identifiable mark. e) The serial number of the instrume
35、nt, the last two digits of which indicate the year of manufacture. f) The number of this BritishStandard, i.e.BS5470. With the consent of the appropriate pattern approval agency, the EEC pattern approval sign “” may also be marked. 11 Accuracy and testing The maximum permissible error shall be 1 sca
36、le division. When an instrument is tested for compliance with this requirement, at least three points evenly distributed over the nominal scale shall be tested. (SeeAppendix A). 12 Determination of temperature A thermometer suitable for the determination of sample temperature, required during the us
37、e of the instruments, is one designated AH/0.5/5/+40 complying with the requirements of BS5471. Table 1 Density and surface tension Density at20 C Surface tension at20 C Density at20 C Surface tension at20 C kg/m 3 780 786 790 794 800 806 810 814 820 826 830 834 840 846 850 854 860 866 870 874 880 8
38、86 890 894 mN/m 21.1 22.3 22.4 22.7 22.9 23.2 23.4 23.5 23.8 24.1 24.3 24.4 24.7 25.0 25.2 25.3 25.6 25.9 26.1 26.3 26.5 26.8 27.0 27.1 kg/m 3 900 906 910 914 920 926 930 934 940 946 950 954 960 966 970 974 980 986 990 994 1000 mN/m 27.5 27.8 28.0 28.2 28.6 29.0 29.4 29.8 30.4 31.3 32.1 32.9 34.7 37
39、.1 39.1 41.7 46.2 51.9 56.5 62.0 80.5BS5470:1977 BSI 12-1999 3 Figure 1 Style of graduation for alcohol hydrometersBS5470:1977 4 BSI 12-1999 Appendix A Testing of BritishStandard hydrometers The BritishStandards Institution at its Hemel Hempstead Centre is prepared to examine hydrometers for complia
40、nce with the requirements of this BritishStandard. Testing arrangements and particulars of fees can be obtained on application to the Director, BritishStandards Institution, Maylands Avenue, Hemel Hempstead, Herts HP24SQ.5 blankBS5470:1977 BSI 12-1999 6 Publications referred to BS5471, Thermometer f
41、or use with alcohol hydrometers. ISO/DIS387, Hydrometers Principles of construction and adjustment 3) . ISO/DIS4801, Glass alcoholometers and alcohol hydrometers not incorporating a thermometer 3) . 3) In course of preparation.BS5470:1977 BSI 12-1999 The Kitemark is a registered certification trade
42、mark of the BritishStandards Institution. A licence to use the Kitemark on or in relation to a product will be granted to any manufacturer or producer who demonstrates that he can and will be able consistently to make that product to a specified British Standard. His capability of doing so is initia
43、lly assessed by inspection of his production process, quality control organization and test facilities, and by independent testing of a sample of the product against all the criteria of the relevant standard. The licensee is required to accept, and to operate in accordance with, a BSI scheme of supe
44、rvision and control which identifies the tests to be carried out during manufacture and on the completed product, and specifies the frequency of such testing. BSI carries out unannounced inspection visits to the manufacturers works and audit testing of the product, and may withdraw the licence for a
45、ny failure of the manufacturer to comply with the relevant standard or the requirements of the scheme of supervision and control. The presence of the Kitemark on or in relation to a product is an assurance that the goods have been produced under a system of supervision, control and testing, operated
46、 during manufacture and including periodical inspection of the manufacturers works in accordance with the certification mark scheme of BSI. Further particulars of the terms of licence may be obtained from the Quality Assurance Department, BritishStandards Institution Maylands Avenue, Hemel Hempstead
47、, Herts HP24SQ.BS5470:1977 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revi
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