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1、STD-JIS B 7525-ENGL I977 = Y7336iOA U55U4U7 152 JIS JIS B 75251997 JAPAN ESE I N DUSTR IAL STANDARD Translated and Published by Japanese Standards Association Density hydrometers c ICs 17.060 Descriptors : reIative density, hydrometers, density, glass Reference number : JIS B 7525 : 1997 (E) 11 s Co
2、pyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 22:58:50 MDTNo reproduction or networking permitted without license from IHS -,-,- B 7525 : 1997 Foreword This translation has been made based
3、on the original Japanese Industrial Standard revised by the Minister of International Trade and Industry through deliberations at Japanese Industrial Standards Committee in accordance with the Industrial Standardization Law. Consequently, JIS B 7525:1992 is replaced with JIS B 7525:1997. Date of Est
4、ablishment: 1961-11-01 Date of Revision: 1997-11-20 Date of Public Notice in Official Gazette: 1997-11-20 Investigated by: Japanese Industrial Standards Committee Divisional Council on Precision Machinery JIS B 7525:1997, First English edition published in 1998-05 Translated and published by: Japane
5、se Standards Association 4-1-24, Akasaka, Minato-ku, Tokyo, 107-8440 JAPAN In the event of any doubts arising as to the contents, the original JIS is to be the final authority. O JSA 1998 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in an
6、y form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. Printed in Japan Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resal
7、e, 03/15/2007 22:58:50 MDTNo reproduction or networking permitted without license from IHS -,-,- STD-JIS B 7525-ENGL 1997 4933b08 UC5UYOq T25 JAPANESE INDUSTRIAL STANDARD JIS B 7525 : 1997 Density hydrometers Introduction This Japanese Industrial Standard has been prepared on the basis of IS0 649-1
8、published as the first edition in 1981 without making any modification on technical contents, except requirements of Annex 3 (Density hydrometer- J series) and Annex 4 (Specific gravity hydrometer) that not specified in the corresponding International Standard are supplemented as Japanese Industrial
9、 Standard. 1 Scope This Japanese Industrial Standard specifies requirements for five basic series of glass hydrometers of constant mass which are graduated to indicate density (kg/m3 or g/cm3) at 20 O C . Each series comprises hydrometers which between them cover the interval 600 kg/m3 to 2000 kg/m3
10、 or 0.6 g/cm3 to 2.0 g/cm3. The hydrometers are graduated appropriately for use in liquids of low, medium or high surface tension. It also specifies three sub-series of hydrometers which are graduated to indicate density at either 20 O C or 15 “C. These hydrometers having smaller tolerances on scale
11、 error are limited to the range 600 kg/m3 to 1100 kg/m3 or 0.6 g/cm to 1.1 g/cm3 and are for use in liquids of low surface tension. This Standard does not cover hydrometers with a built-in thermometer. These hydrom- eters comply with the requirements of IS0 387. recommended stem diameters is given,
12、for guidance in manufacture, in Annex 2. In addition to the five series and three sub-series, Annex 3 describes J series. Further, the requirements for specific gravity hydrometers as specified in former Standard is given in Table 4. A table of standard categories of surface tension is given in Anne
13、x 1. A table of Examples of shape of density hydrometer are shown in Fig.1. Remarks : IS0 649-1 Laboratory glassware - Density hydrometers for general pur- poses - Part l: Specification 2 Normative references The following standard contains provisions which, through reference in this Standard, const
14、itute provisions of this Standard. IS0 387 Hydrometers - Principles of construction and adjustment 3 per cubic meter (kg/m3) or grams per cubic centimetre (g/cm3). Basis of scale The basis of scale shall be density (mass per unit volume) in kilograms Remarks : The symbol g/ml may be used. 4 Referenc
15、e temperature 4.1 The reference temperature for density hydrometers, excluding the sub-series LSOSP, MSOSP and SSOSP, shall be 20 O C . When used in a liquid at this temperature, the hydrometer shall indicate the density of the liquid at 20 “C. Copyright Japanese Standards Association Provided by IH
16、S under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 22:58:50 MDTNo reproduction or networking permitted without license from IHS -,-,- STD-JIS B 7525-EN6L 1197 4933bUA U550410 7ii7 2 B 7525 : 1997 4.2 The reference temperature for density hydromete
17、rs of the sub-series LSOSP, MSOSP and S5OSP shall be either 20 “C or 15 “C. When used in a liquid at the appropriate temperature, the hydrometer shall indicate the density of the liquid at that temperature. 5 follows : Surface tension The adjustment shall be related to specific capillary conditions
18、as 5.1 When the hydrometer is slightly displaced from its equilibrium position in a liquid, the stem passes through the liquid surface without causing any apparent alteration in the shape of the meniscus. 5.2 The hydrometer scale shall be adjusted either for a given liquid having a given surface ten
19、sion, or for one of the standard categories of surface tension given in Annex 1. Except where the highest precision is required, one of the standard categories of surface tension given in Annex 1 shall be used. For hydrometers of the highest precision, intended for use in particular liquids (for exa
20、mple alcohol solutions), the surface tension values appropriate to clean surfaces of these liquids and to the actual indications of the hydrometer shall be used see clause 14 c). The sub-series LSOSP, MSOSP and SSOSP are limited to the low surface tension category. 6 Reference levels for adjustment
21、and reading 6.1 horizontal liquid surface (horizontal surface reading). The scale of the hydrometers shall be adjusted for readings taken at the level of the Remarks : Alternatively, hydrometers intended for use in opaque liquids may be adjusted for readings at the top of the meniscus (meniscus top
22、reading). 6.2 The middle of the thickness of a scale line shall be taken as its definitive position. 7 in the immediate vicinity of the meniscus. Immersion Hydrometers shall be graduated for use with the emergent stem dry, except 8 Materials and workmanship 8.1 The bulb and the stem shall be made of
23、 a suitable transparent glass, selected and processed to be as free as possible from stress and visible defects, and having a coefficient of cubical thermal expansion of (25 k 2) X 10- O C - I . 8.2 The loading material shall be fixed in the bottom of the hydrometer. After the finished hydrometer ha
24、s been kept in a horizontal position for 1 h at 80 “C and subsequently cooled in that position, the instrument shall meet the requirements of 9.3. 8.3 The strip on which the scale and inscriptions are marked shall have a smooth matt surface. The strip shall show no evidence of charring. The strip be
25、aring the scale shall not become discoloured or distorted when the stem is exposed for 1 h to a temperature of 80 “C. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 22:58:50 MDTNo reproduc
26、tion or networking permitted without license from IHS -,-,- 3 B 7525 : 1997 Remarks: If a hydrometer is intended to be used at a temperature above 80 O C , the loading material and the strip bearing the scale shall meet the requirements of 8.2 and 8.3 at a temperature slightly above the temperature
27、of use. 8.4 There shall be no loose material in the instrument. 9 Form 9.1 The outer surface shall be symmetrical about the main axis. 9.2 preferred, but any design which does not permit air bubbles to be trapped is acceptable. There shall be no abrupt changes in cross-section. The tapered design sh
28、own in Fig. 1 is 9.3 The hydrometer shall float with its axis vertical to within 1.5“ of arc. 9.4 A thermometer shall not form part of a hydrometer conforming with this Standard (see clause 1). Fig. 1 Shape of density hydrometers 10 Scale 10.1 General Examples of recommended scales for the hydromete
29、rs are illustrated in Fig. 2. 10.1.1 fastened in place at the temperature of use (see 8.3). The strip on which the scale and inscriptions are marked shall remain securely 10.1.2 for ensuring that any displacement of the strip is readily apparent. The strip bearing scale shall not displace. Appropria
30、te means shall be incorporated Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 22:58:50 MDTNo reproduction or networking permitted without license from IHS -,-,- STD*JIS B 7525-ENGL 1997 H
31、4933b019 0550432 5LT 4 B 7525 : 1997 10.1.3 No hydrometer shall have more than one type of scale. If a hydrometer has duplicate scales, the values indicated by them shall not significantly differ, and both scales shall comply with the requirements of clause 13. 10.1.4 durably marked. The scale lines
32、 and inscriptions should preferably be black and shall be clearly and 10.1.5 The scale shall be straight and without twist. 10.2 Graduation lines 10.2.1 mm. The graduation lines shall be distinct and of uniform thickness not exceeding 0.3 10.2.2 For the SP series, the thickness of the graduation lin
33、es shall not exceed 0.2 mm. 10.2.3 There shall be no evident local irregularities in the spacing of the graduation lines. 10.2.4 The scale shall be straight and without twist. 10.2.5 one-third and one-half of the way round the circumference of the stem. The short, medium and long scale lines shall e
34、xtend, respectively, at least one-fifth, 10.2.6 The highest and lowest graduation lines indicating the nominal limits of the scale shall be long lines (see 10.3.1, 10.3.2 and 10.3.3). 10.2.7 The short, medium and long lines shall each be vertically disposed so that either the mid-points, or the righ
35、t hand ends or the left hand ends of all graduation lines shall lie on an imaginary line parallel to the axis of the instrument. 10.3 Sequence of graduation lines 10.3.1 On hydrometer scales whose smallest interval is 1 kg/m3 or 0.001 g/cm3 : a) every tenth graduation line shall be a long line; b) t
36、here shall be a medium line between two consecutive long lines ; c) there shall be four short lines between consecutive medium and long lines. 10.3.2 or 0.000 2 g/cm3 : On hydrometer scales whose smallest interval is 2 kg/m3 or 0.2 kg/m3 or 0.002 g/cm3 a) every fifth graduation line shall be a long
37、line; b) there shall be four short lines between two consecutive long lines. 10.3.3 On hydrometer scales whose smallest interval is 0.5 kg/m3 or 0.000 5 g/cm3 : a) every tenth graduation line shall be a long line ; Copyright Japanese Standards Association Provided by IHS under license with JSALicens
38、ee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 22:58:50 MDTNo reproduction or networking permitted without license from IHS -,-,- STD-JIS B 7525-ENGL 1997 E 4933808 0550413 I5b E 5 B 7525 : 1997 b) there shall be four medium lines between two consecutive long lines ; c) th
39、ere shall be one short line between two consecutive medium lines and between consecutive medium and long lines. 10.4 Figuring of graduation lines 10.4.1 Except in the case of duplicate scales, the scale shall have only one set of numbers, and the last digits of the numbers shall be vertically aligne
40、d. 10.4.2 line to be readily identified. The scale shall be figured so as to enable the value corresponding to any graduation 10.4.3 full. The highest and lowest graduation lines of the nominal limits shall be figured in 10.4.4 At least every tenth line shall be figured. 10.4.5 numbers expressed in
41、full, but may be omitted from abbreviated numbers. For density values expressed in g/cm3, the decimal sign shall be included for 10.5 indicated in Table 1. Extension of scale The scale shall be extended beyond the nominal scale limits as L20 series L50 and LSOSP series for typical hydrometers Fig. 2
42、 Recommended scales Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 22:58:50 MDTNo reproduction or networking permitted without license from IHS -,-,- STD-JIS B 7525-ENGL 1977 I I Li733bfl8
43、 U550Li14 372 6 B 7525 : 1997 1300= - 0.8= O0 1300= 10 - 20 40= 0.8 = 50 1 3 5 E M50 and M50SP series M100 series 1 300 1 - 0.8 = O0 - - 20 _. - 20 30= 40- - -40 0.8 = 50 1 3 5 E S50 series S5OSP sub-series Fig. 2 Recommened scales for typical hydrometers (concluded) Copyright Japanese Standards Ass
44、ociation Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 22:58:50 MDTNo reproduction or networking permitted without license from IHS -,-,- 7 B 7525 : 1997 Minimum length of scale range number of scale divisions 1 1 g/cm3 mm Table
45、 1 Principal requirements for series of hydrometers Bulb Volume below Extension diameter lowest scale beyond graduation line scale limits graduation lines mm g/cm3 Series L20 LSO M50 M100 s50 L5OSP M50SP S5OSP Nominal graduation range Maximum total length mm 335 335 270 250 190 335 270 190 kg/m3 20
46、0.020 50 0.050 50 0.050 100 0.100 0 . 2 100 0.0002X 100 105 36 to 40 108* to 132 5 to 10 O.SX100 0.0005X100 125 23 to 27 SO* to 65 2 to 5 1x50 0.001X50 70 20 to 24 30 to 45 2 to 5 2x50 0.00250 85 18 to 20 18 to 26 2 o r 3 50 0.050 50 0.050 50 0.050 2x25 0.002X25 50 18 to 20 18 to 26 2 to 5 0.5X100 0
47、.0005X100 125 23 to 27 SO to 65 2 to 5 1 X.50 0.001 X S O 70 20 to 24 30 to 45 2 to 5 50 Note* For the diameter of the stem to exceed 4mm (see 12.4), these volumes, for hydrometers covering the range 1 700 kg/m3 to 2 O00 kg/m3 (1.7 g/cm3 to 2.0 g/cm), may be near the maximum value. 0.050 1x50 0.001
48、X 5 0 50 18 to 20 18* to 26 2 o r 3 11 Each of the five main series of hydrometers shall cover a total range of 600 kg/m3 to 2 O00 kg/m3 or 0.600 g/cm3 to 2.000 g/cm3. The lower nominal limits of the scales of the L20 series having each range of 20 kg/m3 or 0.02 g/cm3 shall be 600 kg/m3, 620 kg/m3, 640 kg/m3, etc., or 0.600 g/cm3, 0.620 g/cm3, 0.640 g/cm3, etc. Those of the L50, M50, and S50 series hydrometers having each range of 50 kg/m3 shall be 600 kg/m3, 650 kg/m3, 700 kg/m3, etc., or 0.600 g/cm3, 0.650 g/cm3, 0.700 g