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 61298-1:2008National 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.The UK participation in its preparation was entrusted by Technical CommitteeGEL/65, Measurement an
3、d 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 the necessary provisions of acontract. Users are responsible for its correct application. BSI 2009
4、ISBN 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 Strategy Committee on 31 October 2009Amendments issued since publicationAmd. No. Date Text affectedBRI
5、TISH STANDARDBS EN 61298-1:2008EUROPEAN STANDARD EN 61298-1 NORME EUROPENNE EUROPISCHE NORM November 2008 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stass
6、art 35, B - 1050 Brussels 2008 CENELEC - All rights of exploitation in any form and by any means reserved 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 eva
7、luating performance - Part 1: General considerations (IEC 61298-1:2008) Dispositifs de mesure et de commande 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 d
8、ie Bewertung des Betriebsverhaltens - Teil 1: Allgemeine Betrachtungen (IEC 61298-1:2008) This European 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 s
9、tatus of a national standard without any alteration. Up-to-date lists and bibliographical references concerning 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, Germa
10、n). A version in any other language made by translation under the responsibility of a CENELEC member into 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,
11、 Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 61298-1:2008EN 612
12、98-1:2008 - 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 applica
13、ble, 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 61298-1:200861298-1 IEC:2008 7 PROCESS MEASUREMENT AND CONTROL DEVICES GENERAL METHODS AND PROCEDURES FOR EVALUAT
14、ING 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 of process measurement and control devices. The methods and procedures specified in this standa
15、rd 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 relationship (transfer function) between the inputs and outputs, and include analogue and digital
16、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 the series. 2 Normative references The following referenced documents are indispensable for the
17、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, International Electrotechnical Vocabulary (IEV) Electrical and electronic measurements and meas
18、uring 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 inspection by attributes IEC 61298-4, Process measurement and control devices General methods and p
19、rocedures 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 reference conditions ISO 31 (all parts), Quantities and units 3 Terms and definitions For the purp
20、ose 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 can usually be measured (e.g., temperature, flow rate, speed, signal, etc.) IEV 351-21-01, modifi
21、ed BS EN 61298-1:2008 8 61298-1 IEC:2008 3.2 signal physical quantity, one or more parameters of which carry 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 measure
22、d within the specified accuracy IEV 351-27-11, modified 3.4 span algebraic difference between the values 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 unde
23、r specified conditions and by a specified procedure NOTE Accuracy is defined in IEC 60050-300, definition 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
24、is greater than the comparison value. The error is generally expressed as a percentage of the relevant ideal 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
25、 Linearity is defined in IEC 60050(300), definition 311-06-05. NOTE 2 Non-linearity does not include hysteresis. 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 giv
26、es different output values in relation to its input values depending on the directional sequence in which the input values have been applied IEV 351-24-15, modified BS EN 61298-1:200861298-1 IEC:2008 9 3.11 dead band finite range of values within which a variation of the input variable does not prod
27、uce any 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 carri
28、ed out, 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 p
29、rinciple 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 de
30、vice under 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., rout
31、ine tests 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). D
32、eviations 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
33、the generic 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 qual
34、ity and 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 t
35、o meet in service. Unfortunately, it is not practical to evaluate performance under all possible BS EN 61298-1:2008 10 61298-1 IEC:2008 combinations of operating conditions. A standard test procedure is therefore specified which is practical under laboratory conditions, which will provide sufficient
36、 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 compared. 5.2 Economic aspects The test procedures, and the number of test points and measurem
37、ent 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 procedures should be used, but if tests are omitted or curtailed for economic or other reasons, thi
38、s 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 different devices of the same type, the test procedures and methods need to be well defined
39、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 with standardized test methods wherever possible. Deviation from standard methods shall be rep
40、orted. 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 of the specific condition being tested). 5.3.3 Documentation of the test methods The test rep
41、ort 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 (a format for a full report of an evaluation is presented in IEC 61298-4). 5.4 Processing the
42、 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 meaningful information from the evaluation, therefore, cannot be performed following statistical
43、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 band, etc.) the calculations are based on maximum values (positive and negative) of the diffe
44、rence 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 results of a test from the effects of other tests Special care shall be exercised to ensure t
45、hat the results of a test are not influenced by the previous tests. BS EN 61298-1:200861298-1 IEC:2008 11 6 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 te
46、st conditions Temperature C Relative humidity % Atmospheric pressure kPa Standard reference atmosphere 20 65 101,3 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
47、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 the manu
48、facturer. NOTE It is recognized that there may not be a factor to correct for humidity. When measurements within the recommended range of ambient conditions are unsatisfactory, and the correction factors to adjust parameters to the standard atmosphere are unknown, repeat measurements (referee measur
49、ements) may be conducted under the conditions listed in the above Table 1, either aor b, or others reference operating conditions identified by the manufacturer. NOTE Special equipment may be required to maintain the basic tests conditions within the limits specified. 6.1.1 Recommended limits of ambient conditions for test measurements Electromagnetic field: value to be stated, if relevant. The maximum rate of change of ambient temperature permissible during any test shall be
