BS EN 61298-1-2008 Process measurement and control devices - General methods and procedures for evaluating performance - General considerations《过程测量和控制设备 评估性能的一般方法和程序 总则》.pdf

1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI British StandardsWB9423_BSI_StandardColCov_noK_AW:BSI FRONT COVERS 5/9/08 12:55 Page 1Process measurement and control devices Generalmethods and procedures forevaluating performance Part 1: General c

2、onsiderationsBS EN 61298-1:2008Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 21/01/2010 01:55, Uncontrolled Copy, (c) BSINational forewordThis British Standard is the UK implementation of EN 61298-1:2008. It isidentical to IEC 61298-1:2008. It supersedes BS EN 61298-1:1996 which iswithdrawn

3、.The UK participation in its preparation was entrusted by Technical CommitteeGEL/65, Measurement and control, to Subcommittee GEL/65/2, Elements ofsystems.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all

4、 the necessary provisions of acontract. Users are responsible for its correct application. BSI 2009ISBN 978 0 580 55953 2ICS 25.040.40Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of the StandardsPolicy and Str

5、ategy Committee on 31 October 2009Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN 61298-1:2008Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 21/01/2010 01:55, Uncontrolled Copy, (c) BSIEUROPEAN STANDARD EN 61298-1 NORME EUROPENNE EUROPISCHE NORM November 2

6、008 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2008 CENELEC - All rights of exploitation in any form and by any means reser

7、ved worldwide for CENELEC members. Ref. No. EN 61298-1:2008 E ICS 25.040.40 Supersedes EN 61298-1:1995English version Process measurement and control devices - General methods and procedures for evaluating performance - Part 1: General considerations (IEC 61298-1:2008) Dispositifs de mesure et de co

8、mmande de processus - Mthodes et procdures gnrales dvaluation des performances - Partie 1: Gnralits (CEI 61298-1:2008) Prozessmess-, -steuer- und -regelgerte - Allgemeine Methoden und Verfahren fr die Bewertung des Betriebsverhaltens - Teil 1: Allgemeine Betrachtungen (IEC 61298-1:2008) This Europea

9、n Standard was approved by CENELEC on 2008-11-01. CENELEC 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 c

10、oncerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC 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 CENELEC member i

11、nto its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ire

12、land, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 61298-1:2008Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 21/01/2010 01:55, Uncontrolled Copy, (c) BSIEN 61298-

13、1:2008 - 2 - Foreword The text of document 65B/685/FDIS, future edition 2 of IEC 61298-1, prepared by SC 65B, Devices any particular method or procedure, not covered by this standard, should be developed and specified in the new standard in accordance with the criteria, as far as they are applicable

14、, stated in this standard; any conceptual or significant deviation from the content of this standard, should clearly be identified and justified if introduced in a new standard. BS EN 61298-1:2008Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 21/01/2010 01:55, Uncontrolled Copy, (c) BSI61298

15、-1 IEC:2008 7 PROCESS MEASUREMENT AND CONTROL DEVICES GENERAL METHODS AND PROCEDURES FOR EVALUATING PERFORMANCE Part 1: General considerations 1 Scope This part of IEC 61298 specifies general methods and procedures for conducting tests, and reporting on the functional and performance characteristics

16、 of process measurement and control devices. The methods and procedures specified in this standard are applicable to any type of process measurement and control device. The tests are applicable to any such devices characterized by their own specific input and output variables, and by the specific re

17、lationship (transfer function) between the inputs and outputs, and include analogue and digital devices. For devices that require special tests, this standard should be used, together with any product specific standard specifying special tests. This standard covers general principles which apply to

18、the series. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60050-300,

19、 International Electrotechnical Vocabulary (IEV) Electrical and electronic measurements and measuring instruments (composed of Part 311, 312, 313 and 314) IEC 60050-351, International Electrotechnical Vocabulary (IEV) Part 351: Control technology IEC 60410:1973, Sampling plans and procedures for ins

20、pection by attributes IEC 61298-4, Process measurement and control devices General methods and procedures for evaluating performance Part 4: Evaluation report content IEC 61298-2, Process measurement and control devices General methods and procedures for evaluating performance Part 2: Tests under re

21、ference conditions ISO 31 (all parts), Quantities and units 3 Terms and definitions For the purpose of this document, the following relevant terms and definitions, some of them based on IEC 60050(300) or IEC 60050(351), apply. 3.1 variable quantity or condition whose value is subject to change and c

22、an usually be measured (e.g., temperature, flow rate, speed, signal, etc.) IEV 351-21-01, modified BS EN 61298-1:2008Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 21/01/2010 01:55, Uncontrolled Copy, (c) BSI 8 61298-1 IEC:2008 3.2 signal physical quantity, one or more parameters of which ca

23、rry information about one or more variables which the signal represents IEV 351-21-51, modified 3.3 range range of values defined by the two extreme values, within which a variable can be measured within the specified accuracy IEV 351-27-11, modified 3.4 span algebraic difference between the values

24、of the upper and lower limits of the measuring range IEV 311-03-13 3.5 inaccuracy maximum positive and negative deviation from the specified characteristic curve observed in testing a device under specified conditions and by a specified procedure NOTE Accuracy is defined in IEC 60050-300, definition

25、 311-06-08. 3.6 error algebraic difference between the indicated value and a comparison value of the measured variable IEV 351-27-04, modified NOTE The error is positive when the indicated value is greater than the comparison value. The error is generally expressed as a percentage of the relevant id

26、eal span. 3.7 measured error largest positive or negative value of errors of the average upscale or downscale values at each point of measurement 3.8 non-linearity deviation from linearity NOTE 1 Linearity is defined in IEC 60050(300), definition 311-06-05. NOTE 2 Non-linearity does not include hyst

27、eresis. 3.9 non-repeatability deviation from repeatability NOTE Repeatability is defined in IEC 60050(300), definition 311-06-06. 3.10 hysteresis property of a device or instrument whereby it gives different output values in relation to its input values depending on the directional sequence in which

28、 the input values have been applied IEV 351-24-15, modified BS EN 61298-1:2008Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 21/01/2010 01:55, Uncontrolled Copy, (c) BSI61298-1 IEC:2008 9 3.11 dead band finite range of values within which a variation of the input variable does not produce an

29、y measurable change in the output variable IEV 351-24-14, modified 3.12 unexpected event device breakdown, failure to work, anomaly, or inadvertent damage occurring during an evaluation, which requires correction by the device manufacturer 3.13 test procedure statement of the tests to be carried out

30、, and the conditions for each test, agreed between the manufacturer, the test laboratory, and the purchaser/user before the evaluation starts 3.14 type tests a test of one or more devices made to a certain design to show that the design meets certain specifications NOTE The type tests are in princip

31、le applied only on a sample. Normally are not repeated on all the individual units of equipment made in series. 4 Test categories The tests specified can be considered under two categories. a) Complete tests These cover performance evaluations or type tests to establish the performance of a device u

32、nder any likely operating conditions; to permit comparison with the manufacturers published or stated performance specification for the device, or the users requirements. b) Simplified tests These cover a selection of the complete tests to check specific characteristics of a device (e.g., routine te

33、sts of all devices before delivery, or tests on a random sample of devices). Where the full range of tests is not carried out, this shall be stated in all reports on the testing, and the reasons given (e.g., economy, lack of relevance to the particular application, or failure of the device). Deviati

34、ons from the test procedures specified shall also be reported. The programme of tests, prepared in accordance with this standard, shall be agreed between the test house, the initiator/purchaser, and where appropriate, the device supplier or manufacturer, before tests are commenced. Because of the ge

35、neric nature of this standard, the tests listed may be too extensive, or insufficiently comprehensive for a particular requirement, and a modification of the test programme may be agreed. The criteria for accepting test results (e.g., expected or limiting values), and for judgement of the quality an

36、d acceptance of the device under test, are strictly related to the subsequent use of the test results, and are outside the scope of this standard. 5 General criteria 5.1 Realistic operating conditions Ideally, instruments should be evaluated under each of the conditions which they are likely to meet

37、 in service. Unfortunately, it is not practical to evaluate performance under all possible BS EN 61298-1:2008Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 21/01/2010 01:55, Uncontrolled Copy, (c) BSI 10 61298-1 IEC:2008 combinations of operating conditions. A standard test procedure is ther

38、efore specified which is practical under laboratory conditions, which will provide sufficient data on which a prediction of field performance can be made. Use of a small number of standard conditions covering the range will simplify testing, and enable tests on different devices to be more readily c

39、ompared. 5.2 Economic aspects The test procedures, and the number of test points and measurement cycles, shall be chosen so as to obtain the best compromise between objectives and relevance of the results on the one hand, and costs and technical difficulties of the test on the other. Standard proced

40、ures should be used, but if tests are omitted or curtailed for economic or other reasons, this shall be stated in the test report. 5.3 Replication of the tests and comparability of the results To obtain comparable results from tests performed at different times and places, by different operators, on

41、 different devices of the same type, the test procedures and methods need to be well defined and reproducible. In particular, the following are required. 5.3.1 Standardization of test methods The test methods to be followed during the evaluation shall be decided before the start, and shall conform w

42、ith standardized test methods wherever possible. Deviation from standard methods shall be reported. 5.3.2 Influence factors During the test, all the factors which might influence the behaviour of the Device Under Test (DUT) shall be checked and maintained as constant as possible (with the exception

43、of the specific condition being tested). 5.3.3 Documentation of the test methods The test report shall clearly indicate the standards or standard referred to during the evaluation, and state the test conditions and any deviation from the specified conditions which has occurred during the evaluation

44、(a format for a full report of an evaluation is presented in IEC 61298-4). 5.4 Processing the results Due to economic aspects (see 5.2), the number of measurements during a test is often reduced to the minimum, and therefore it is statistically insignificant. Processing of the results to obtain mean

45、ingful information from the evaluation, therefore, cannot be performed following statistical methods, but it shall be performed following conventional methods. Consequently, in view of the general nature of the parameters characterizing the DUT (e.g., inaccuracy, hysteresis, non-repeatability, dead

46、band, etc.) the calculations are based on maximum values (positive and negative) of the difference between the measured value and conventional true values, with the exception of a few quantities, for which use is made of averaged values (e.g., measured error, non-linearity). 5.5 Independence of the

47、results of a test from the effects of other tests Special care shall be exercised to ensure that the results of a test are not influenced by the previous tests. BS EN 61298-1:2008Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 21/01/2010 01:55, Uncontrolled Copy, (c) BSI61298-1 IEC:2008 11 6

48、General conditions for tests and samples 6.1 Environmental test conditions The test shall be performed under these ambient test conditions. Table 1 Environmental test conditions Atmospheric test conditions Temperature C Relative humidity % Atmospheric pressure kPa Standard reference atmosphere 20 65

49、 101,3 Recommended limits 15-25 45-75 86-106 a 20 2 65 5 86-106 Referee measurements b 23 2 50 5 86-106 aFor equipment suitable for mechanical, weight, pressure and similar applications. bFor equipment for electrical, temperature, humidity and similar applications. The test values shall be corrected back to the standard reference atmosphere conditions listed above. The standard reference atmosphere is equivalent to the normal reference operating conditions commonly identified by