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1、BRITISH STANDARD BS 7653-1: 1993 Piston and/or plunger operated volumetric apparatus Part 1: Glossary of terms Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:17:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7653-1:1993 This British Standard, having been p
2、repared under the direction of the Laboratory Apparatus Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 July 1993 BSI 08-1999 The following BSI references relate to the work on this standard: Committee reference LBC/36 Draft for commen
3、t 90/53955 DC ISBN 0 580 22114 8 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Laboratory Apparatus Standards Policy Committee (LBC/-) to Technical Committee LBC/36, upon which the following bodies were represented: Association for Sci
4、ence Education British Glass Manufacturers Confederation BLWA (Association of the Laboratory Supply Industry) CLEAPSS School Science Service Department of Trade and Industry (Laboratory of the Government Chemist) Institute of Medical Laboratory Sciences The following bodies were also represented in
5、the drafting of the standard, through a subcommittee: Department of Trade and Industry (National Weights and Measures Laboratory) Royal Society of Chemistry Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08
6、10:17:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7653-1:1993 BSI 08-1999i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2Informative references1 Section 1. Piston and/or plunger operated volumetric apparatus (POVA)2 Section 2.Types of displacement3 Section 3. Types
7、of instrument4 Section 4. Metrology5 Section 5. Temperature5 Section 6. Additional features of POVA6 Figure 1 Piston device2 Figure 2 Plunger device2 Figure 3 Types of displacement with an air interface (air displacement)3 Figure 4 Types of displacement without an air interface (positive displacemen
8、t)4 List of referencesInside back cover Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:17:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7653-1:1993 ii BSI 08-1999 Foreword This Part of BS 7653 has been prepared under the direction of the Laboratory Appara
9、tus Standards Policy Committee, in anticipation of the publication by the International Organization for Standardization (ISO) of ISO 8655-1, which will list definitions for piston and/or plunger operated volumetric apparatus (POVA). The draft International Standard ISO/DIS 8655-1 was prepared by Su
10、bcommittee 1 of ISO/TC 48, Laboratory glassware and related products, with the active participation and approval of the UK. The equivalent draft British Standard was issued for public comment in June 1990. Subsequent to the approval of ISO/DIS 8655-1 for publication, no action was taken by ISO/TC 48
11、/SC 1. To avoid further delay, the Laboratory Apparatus Standards Policy Committee approved publication of the equivalent British Standard, in advance of ISO 8655-1, based on the draft International Standard. This Part of BS 7653 is one of four Parts published together, the other three being as foll
12、ows: Part 2: Methods of operation; Part 3: Methods of test; Part 4: Specification for conditions of test, safety and supply. 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
13、 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 6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had
14、 amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:17:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7653-1:1993 BSI 08-19991 1 Scope This Part of BS 7653 define
15、s terms to be used in connection with piston and/or plunger operated volumetric apparatus (POVA), adequate for general laboratory purposes. The definitions given in this Glossary apply to both single- and multi-channel POVA, i.e. POVA for both single and multiple delivery of the stated volume with e
16、ach operation. 2 Informative references This Part of BS 7653 refers to other publications that provide information or guidance. Editions of these publications current at the time of issue of this standard are listed on the inside back cover, but reference should be made to the latest editions. Licen
17、sed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:17:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7653-1:1993 2 BSI 08-1999 No.TermDefinition Section 1. Piston and/or plunger operated volumetric apparatus (POVA) NOTEThe volume of liquid to be measured with POVA
18、is defined by one or more strokes of one or more pistons or plungers. 1 01piston deviceDevice in which a piston displaces the volume contained in the length of the cylinder through which it moves, i.e. the volume is a function of the cylinders internal dimensions and piston stroke length (see Figure
19、 1). Figure 1 Piston device 1 02plunger deviceDevice in which a plunger displaces its own volume (according to the depth inserted) from the enclosed system it penetrates, i.e. the volume is a function of the plungers external dimensions and stroke length (see Figure 2). NOTE 1In the following text t
20、he word “piston” means “piston or plunger”. NOTE 2POVA may be operated manually or mechanically (i.e. by hand, electrically, pneumatically or by hydrostatic pressure). Figure 2 Plunger device Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:17:55 GMT+00:00 200
21、6, Uncontrolled Copy, (c) BSI BS 7653-1:1993 BSI 08-19993 No.TermDefinition Section 2. Types of displacement 2 01displacement with an air interface Displacement of the delivered liquid by an air interface separating the delivered liquid from the piston or from liquid in the system (see Figure 3). NO
22、TEThis is sometimes called “air displacement”. Figure 3 Types of displacement with an air interface (air displacement) Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:17:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7653-1:1993 4 BSI 08-1999 No.TermDefinit
23、ion 2 02displacement without an air interface Displacement of the delivered liquid either by a liquid interface or by actual contact with the piston (see Figure 4). NOTEThis is sometimes called “positive displacement”. Figure 4 Types of displacement without an air interface (positive displacement) S
24、ection 3. Types of instrument 3 01pipetterPOVA for the transfer of a predetermined volume of liquid from one vessel to another. NOTEIt is not connected to a reservoir. 3 02dispenserPOVA for delivery of predetermined volumes of liquid from a reservoir. NOTEThe reservoir may be integrated with the POV
25、A or connected externally. 3 03dilutorPOVA for taking up different liquids (e.g. sample and diluent) and delivering them in combination so as to comprise a predetermined ratio and/or predetermined volumes. NOTEThe reservoir of diluent may be integrated with the POVA or connected externally. 3 04disp
26、lacement burette Measuring instrument, the volume delivered from which is determined by an external indicator, such that the volume delivered can then be read. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:17:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS
27、 7653-1:1993 BSI 08-19995 No.TermDefinition Section 4. Metrology NOTEThe metrological vocabulary used is in accordance with PD 6461-1. Statistical vocabulary and terms used are in accordance with BS 5532-1. 4 01nominal volume(s)The stated volume(s) for which performance is specified by the manufactu
28、rer. 4 02unit of volumeThe millilitre (ml) or the microlitre (4l), which are accepted substitutes for the cubic centimeter (cm3) or cubic millimetre (mm3). NOTEIt is recommended that volumes should be specified in microlitres up to 999 4l, and in millilitres from 1 ml. 4 03accuracy of measurement Th
29、e closeness of the agreement between the result of a measurement and the (rated) nominal volume of the measuring instrument, as obtained by applying the test procedure specified in BS 7653-3. It is quantified by the inaccuracy of the mean. 4 04repeatability of measurements The closeness of agreement
30、 between the results of successive measurements of the same measuring instrument, as obtained by applying the test procedure specified in BS 7653-3. It is expressed quantitatively in terms of the scatter of the results, as the percentage coefficient of variation. NOTE 1The repeatability is commonly
31、known also as “precision”. NOTE 2The definitions accuracy of measurement and repeatability of measurements apply only in cases where the distributions are Gaussian. 4 05working range (of a measuring instrument) That part (of the total range) for which manufacturers performance specifications are giv
32、en. Section 5. Temperature 5 01reference temperature The temperature at which the measuring instrument is designed to deliver its rated nominal volume(s). NOTEAt this temperature, the closest agreement between manufacturers performance claims and test results may be expected. 5 02reference temperatu
33、re range The temperature interval for which the highest accuracy of measurement is specified. 5 03working temperature range That interval of temperatures for which manufacturers performance specifications are given, where these differ from the accuracy specification referred to in 5.02. Licensed Cop
34、y: London South Bank University, London South Bank University, Fri Dec 08 10:17:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7653-1:1993 6 BSI 08-1999 No.TermDefinition Section 6. Additional features of POVA 6 01stated featureAny feature claimed by the manufacturer. 6 02durabilityAny claim by th
35、e manufacturer of resistance of apparatus to conditions of use (e.g. sterilization or chemical exposure). NOTEA claim of durability implies that long-term or repeated exposure to the conditions (as indicated by the manufacturer) will not affect the rated performance of the apparatus. 6 03sample carr
36、yoverThat portion of the sample which is retained in the measuring instrument and which may affect subsequent samples. 6 04disposable partsThose parts of an apparatus which are intended to be used once only and then discarded. NOTEDisposable parts, e.g. pipette tips, are generally intended for use i
37、n applications where sample carryover is intolerable. 6 05reusable partsThose parts of an apparatus which are intended to be used more than once. NOTE 1As the “reusability” of some parts can rarely be quantified, any institution or individual reusing a reusable part bears responsibility for its safe
38、ty and effectiveness. NOTE 2Reusable parts are generally intended for use in applications where sample carryover is tolerable, or can be adequately prevented. NOTE 3The liquid may be contained in or delivered by either reusable parts or disposable parts. Licensed Copy: London South Bank University,
39、London South Bank University, Fri Dec 08 10:17:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7653-1:1993 BSI 08-1999 List of references (see clause 2) Informative references BSI standards publications BRITISH STANDARDS INSTITUTION, London BS 5532, Statistical terminology. BS 5532-1:1978, Glossary
40、 of terms relating to probability and general terms relating to statistics. PD 6461, Vocabulary of metrology. PD 6461-1:1985, Basic and general terms (international). BS 7653, Piston and/or plunger operated volumetric apparatus. BS 7653-2:1993, Methods of operation. BS 7653-3:1993, Methods of test.
41、BS 7653-4:1993, Specification for conditions of test, safety and supply. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:17:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7653-1: 1993 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institutio
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