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1、BRITISH STANDARD BS EN ISO 15212-2:2002 Oscillation-type density meters Part 2: Process instruments for homogenous liquids ICS 17.060 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Incorporating corrigenda May 2002 and December 2008 Licensed CopyChinese University of Hong Kon
2、g, 13/06/2009 08:01, Uncontrolled Copy, (c) BSI BS EN ISO 15212-2:2002 This British Standard, was published under the authority of the Standards Policy and Strategy Committee on 26 April 2002 National foreword This British Standard is the UK implemen tion of EN ISO 15212-2:2002. It is identical with
3、 ISO15212-2:2002, incorporating corrigendum December 2008. The start and finish of text introduced or altered by corrigendum is indicated in the text by tags. Text altered by ISO corrigendum December 2008 is indicated in the text by . The UK participation in its preparation was entrusted to Technica
4、l Committee LBI/36/4, Density measuring instruments. A list of organizations represented on this subcommittee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compl
5、iance with a British Standard cannot confer immunity from legal obligations. Amendments/corrigenda issued since publication AC1AC1 Amd. No.DateComments 13920 Corr. No.1 15 May 2002Incorporating Annex ZA and correction to EN ISO foreword Implementation of ISO corrigendum December 2008 BSI 2009 ISBN 9
6、78 0 580 67109 8 31 May 2009 a Licensed CopyChinese University of Hong Kong, 13/06/2009 08:01, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 15212-2 March 2002 ICS 17.060 English version Oscillation-type density meters - Part 2: Process instruments for homogeneo
7、us liquids (ISO 15212-2:2002) Densimtres oscillation - Partie 2: Instruments industriels pour liquides homognes (ISO 15212-2:2002) Dichtemessgerte nach dem Schwingerprinzip - Teil 2: Prozessgerte fr homogene Flssigkeiten (ISO 15212- 2:2002) This European Standard was approved by CEN on 1 March 2002.
8、 CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on
9、application to the Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Management Centre has
10、the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN C
11、OMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2002 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 15212-2:2002 E Licensed CopyC
12、hinese University of Hong Kong, 13/06/2009 08:01, Uncontrolled Copy, (c) BSI I NESO 51-212:2002( 2E) 2 CORRECTED 2002-04-17 Foreword This document (ISO 15212-2:2002) has been prepared by Technical Committee ISO/TC 48 “Laboratory glassware and related apparatus“ in collaboration with Technical Commit
13、tee CEN/TC 332 “Laboratory equipment“, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 2002, and conflicting national standards shall be withdraw
14、n at the latest by September 2002. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, L
15、uxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of the International Standard ISO 15212-2:2002 has been approved by CEN as a European Standard without any modifications. NOTE Normative references to International Standar
16、ds are listed in annex ZA (normative). 4 egaP EN ISO 152122:2002 BS EN ISO 15212-2:2002 Licensed CopyChinese University of Hong Kong, 13/06/2009 08:01, Uncontrolled Copy, (c) BSI iii Contents Page 1Scope . 1 2Normative references . 1 3Terms and definitions 2 4Principle and functional units 2 4.1Meas
17、uring principle . 2 4.2Functional units . 2 5Density sensor 4 5.1Sensor material . 4 5.2Sensor design 4 6Requirements and tests 4 6.1General 4 6.2Density measuring transducer . 4 6.3Liquid temperature measurement 6 6.4Display and output of results . 7 6.5Auxiliary units and data transfer 7 6.6Safety
18、 requirements 8 6.7Electromagnetic compatibility 8 7Preadjustment and adjustment . 8 7.1Preadjustment of process density meters . 8 7.2Preadjustment of density measuring transducers . 8 7.3Adjustment of installed density measuring transducers 8 7.4Adjustment of processing units 8 8Calibration 9 8.1L
19、aboratory calibration 9 8.2In-situ calibration . 11 9Process density meter accuracy . 13 9.1Accuracy requirements 13 9.2Laboratory conformity test . 13 9.3In-situ tests 14 9.4Test procedure and conformity assessment 14 10Installation 15 11Operating manual . 15 12Marking . 16 EN ISO 152122:2002 BS EN
20、 ISO 15212-2:2002 Licensed CopyChinese University of Hong Kong, 13/06/2009 08:01, Uncontrolled Copy, (c) BSI v Introduction Density values of pure water at different temperatures and information on how to calculate the density values at different pressures can be found in ISO 15212-1:1998, annex A.
21、EN ISO 152122:2002 BS EN ISO 15212-2:2002 Licensed CopyChinese University of Hong Kong, 13/06/2009 08:01, Uncontrolled Copy, (c) BSI 1 Oscillation-type density meters Part 2: Process instruments for homogeneous liquids 1Scope This part of ISO 15212 specifies metrological requirements, among others,
22、for oscillation-type density meters as well as for functional units (see 4.2) of oscillation-type density meters, which are used in process for all kinds of homogeneous liquids. This includes liquified gases. Instructions and methods for installation, preadjustment, adjustment and calibration of pro
23、cess instruments are also given. The instruments are either integral systems or functional units, which can be combined into an integral measuring system. This part of ISO 15212 does not describe the method of use of process density meters for particular applications or products, e.g. petroleum prod
24、ucts or beverages. Such methods of use can be defined by relevant institutions such as ISO or responsible Government agencies. This part of ISO 15212 does not define an instrument specification for any particular application. For this information reference should be made to the relevant standard cov
25、ering the method of use. This part of ISO 15212 is addressed to manufacturers of density meters and to bodies, testing and certifying the conformity of density meters. This part of ISO 15212 also gives recommendations for adjustment and calibration of process density meters. Oscillation-type density
26、 meters used in laboratories are addressed in ISO 15212-1. 2Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of ISO 15212. For dated references, subsequent amendments to, or revisions of, any of these
27、publications do not apply. However, parties to agreements based on this part of ISO 15212 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to ap
28、plies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 15212-1:1998, Oscillation-type density meters Part 1: Laboratory instruments IEC 61010-1, Safety requirements for electrical equipment for measurement, control and laboratory use Part 1: General requirem
29、ents EN ISO 152122:2002 IEC 61326-1, Electrical equipment for measurement, control and laboratory use EMC requirements Part 1: General requirements ISO/IEC Guide 98-3, Uncertainty of measurement Part 3: Guide to the expression of uncertainty in measurement (GUM:1995) AC1 AC1 BS EN ISO 15212-2:2002 L
30、icensed CopyChinese University of Hong Kong, 13/06/2009 08:01, Uncontrolled Copy, (c) BSI 2 3Terms and definitions For the purposes of this part of ISO 15212, the terms and definitions given in ISO 15212-1 and the following apply. 3.1 preadjustment process density meter adjustment performed in a lab
31、oratory environment before installation NOTEAdjustment, see 3.1 of ISO 15212-1:1998. 3.2 laboratory calibration process density meter calibration for the intended entire working range of the instrument performed in a laboratory environment before installation NOTECalibration, see 3.2 of ISO 15212-1:
32、1998. 3.3 in-situ calibration process density meter calibration of the installed instrument for its actual working conditions in a process environment 4Principle and functional units 4.1Measuring principle The sensors used in density meters are electrically or mechanically induced oscillating system
33、s, whose oscillation frequencies or periods are a function of the liquid density. Depending on the sensor design, the liquid can either flow through the sensor or the sensor can be immersed in the liquid. Instrument constants of the adjusted density meter are used to calculate the sample density fro
34、m the oscillation frequency or oscillation period and from associated measurements, e.g. temperature or pressure. 4.2Functional units Oscillation-type process density meters shall consist of the following functional units: a)a density sensor through which the liquid flows or which is immersed in the
35、 liquid; b)a device to determine the density sensor temperature; c)a device to condition and/or preamplify the density sensor signal; d)a device to condition and/or preamplify the temperature sensor signal; e)a unit for signal processing, output of results and functional monitoring. Optional functio
36、nal units of process density meters may be: f)a temperature transducer to measure the liquid temperature (see item 6 in Figure 1); g)a pressure transducer to measure the liquid pressure (see item 7 in Figure 1). The functional units a) to d) are often referred to as density measuring transducer (see
37、 item 8 in Figure 1). The unit e) can be referred to as processing or indicating unit (see item 5 in Figure 1) and may accept additional signals or process parameters, e.g. from a flow meter. The functional units, items 5 and 8 in Figure 1, can be integrated into a single instrument or can be separa
38、te units. EN ISO 152122:2002 BS EN ISO 15212-2:2002 Licensed CopyChinese University of Hong Kong, 13/06/2009 08:01, Uncontrolled Copy, (c) BSI 3 Key 1Density sensor see 4.2 a) 2Temperature sensor see 4.2 b) 3Density sensor signal preamplification see 4.2 c) 4Temperature sensor signal preamplificatio
39、n see 4.2 d) 5Processing or indicating unit see 4.2 e) 6Temperature transducer see 4.2 f) 7Pressure transducer see 4.2 g) 8Density measuring transducer 9Liquid to be measured 10Output (display, printer, interface) Figure 1 Functional units of a process density meter EN ISO 152122:2002 BS EN ISO 1521
40、2-2:2002 Licensed CopyChinese University of Hong Kong, 13/06/2009 08:01, Uncontrolled Copy, (c) BSI 4 5Density sensor 5.1Sensor material Density sensor materials can be, for example, metal, metal alloys, coated metals or glass. The material is considered to be suitable if it is compatible with the p
41、rocess liquids to be measured at the process conditions and with the cleaning agents to be used in the density meter. Erosion, abrasion as well as special forms of corrosion shall be considered in this respect since they have an impact on the accuracy of the instrument. The manufacturer shall provid
42、e certificates about the sensor material on request. 5.2Sensor design Density sensors can be designed as straight, U-formed or omega-formed tubes. Other designs are tuning-forks, cylinders, bells or membranes. All designs which conform with the functional principle in accordance with 4.1 can be cons
43、tructed. 6Requirements and tests 6.1General 6.2Density measuring transducer 6.2.1Drift 6.2.1.1Within 30 days, the drift of the measured density at a temperature of , at a pressure of to 1) ( to ) and at a typical flow rate specified in the manual shall not exceed of the maximum permissible error spe
44、cified by the manufacturer for the instrument. If the working range of the density meter does not include the above mentioned conditions, the drift at the typical measuring conditions of the density meter shall not exceed of the specified maximum permissible error. 6.2.1.2The test for the drift dete
45、rmination shall be performed as follows: install the instrument, preadjusted by the manufacturer, to a liquid circulation system; suited liquids can be for example water or mineral oil; switch on the instrument and attemper it for ; circulate the liquid through the instrument and record the density
46、at least three times at within ; 1). 3020 C 0,1 MPa 0,2 MPa1 bar2 bar20 % 1 bar=105N/m2=0,1 MPa 40 % 24 h (200,1) C 30 min EN ISO 152122:2002 All the tests of Clause 6 are intended to be type tests and to be performed at a measurement temperature of 20 C if not otherwise specified in the text. When
47、the density meter is required for use in a country which has adopted a standard reference temperature of 27 C (the alternative recommended for tropical use), this figure shall be substituted for 20 C and all temperatures representing differences in temperature compared to 20 C shall be replaced by c
48、orresponding temperatures, e.g., in 6.2.1.2, (10 1) C shall be replaced by (17 1) C and (30 1) C by (37 1) C. AC1 AC1 BS EN ISO 15212-2:2002 Licensed CopyChinese University of Hong Kong, 13/06/2009 08:01, Uncontrolled Copy, (c) BSI 5 Instrument, liquid circulation and thermostating device shall be i
49、n operation during the whole test. During the minimum time period of 30 days between the two density measurements, the instrument shall be run at least 2 days at a temperature of and another 2 days at a temperature of . To calculate the drift, , use the following equation: (1) where is the difference in days between the two threefold measurements. If the density measuring transducer is not designed for a measuring temperature of , testing shall be performed at the mean measuri