1、BRITISH STANDARD BS 7623:1993 IEC 1153:1992 Electrical and pneumatic analogue chart recorders for use in industrial-process control systems Guidance for inspection and routine testingBS7623:1993 This British Standard, having been prepared under the directionof the Industrial-process Measurement and
2、Control Standards Policy Committee, was published underthe authority of the Standards Board and comes intoeffect on 15 January 1993 BSI 10-1999 The following BSI references relate to the work on this standard: Committee reference PCL/1 Draft for comment 90/26001 DC ISBN 0 580 21553 9 Committees resp
3、onsible for this British Standard The preparation of this British Standard was entrusted by the Industrial-process Measurement and Control Standards Policy Committee (PCL/-) to Technical Committee PCL/1, upon which the following bodies were represented: British Coal Corporation British Gas plc Briti
4、sh Telecommunications plc Department of Energy (Gas and Oil Measurement Branch) Electricity Association Energy Industries Council Engineering Equipment and Materials Users Association GAMBICA (BEAMA Ltd.) Health and Safety Executive Institution of Gas Engineers The following bodies were also represe
5、nted in the drafting of the standard, through subcommittees and panels: Department of Trade and Industry (National Engineering Laboratory) Engineering Industries Association Institute of Metals Institution of Electrical Engineers Amendments issued since publication Amd. No. Date CommentsBS7623:1993
6、BSI 10-1999 i Contents Page Committees responsible Inside front cover National foreword ii 1 Scope and object 1 2 Normative references 1 3 Sampling for test 1 4 Definitions 1 5 Performance test 1 List of references Inside back coverBS7623:1993 ii BSI 10-1999 National foreword BS 7623 has been prepar
7、ed under the direction of the Industrial-process Measurement and Control Standards Policy Committee. It is identical with IECPublication 1153:1992 Electrical and pneumatic analogue chart recorders for use in industrial-process control systems Guidance for inspection and routine testing, published by
8、 the International Electrotechnical Commission (IEC). The Technical Committee has reviewed the provisions of IEC 382:1991 and IEC410:1973, to which normative reference is made in the text, and has decided that they are acceptable for use in conjunction with this standard. A related British Standard
9、to IEC 873:1986 is BS 4671:1987. 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 with a British Standard does not of itself confer immunity from legal obligations. Cross-re
10、ferences International Standard Corresponding British Standard IEC 381-1:1982 BS 5863 Analogue signals for process control systems Part 1:1984 Specification for direct current signals (Identical) IEC 381-2:1978 Part 2:1980 Specification for direct voltage signals (Identical) Summary of pages This do
11、cument comprises a front cover, an inside front cover, pages i and ii, pages1 and 2, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS7623:199
12、3 BSI 10-1999 1 1 Scope and object This International Standard applies to electrical and pneumatic analogue chart recorders (for use in industrial process control systems) using analogue signals which are in accordance with IEC 381 andIEC 382. Some tests may not apply to all instruments and addition
13、al tests may be required for certain types of recorders. This standard is intended to provide technical guidance for inspection and routine testing of electrical and pneumatic analogue chart recorders, for instance, as acceptance tests or after repair. For a full evaluation, IEC 873 should be used.
14、Quantitative criteria for acceptable performance shall be established by agreement between manufacturer and user. The requirements of this standard shall be effective when agreed by the manufacturer and the user. 2 Normative references The following normative documents contain provisions which, thro
15、ugh reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibili
16、ty of applying the most recent editions of the normative documents indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. IEC 381, Analogue signals for process control systems. IEC 382:1971, Analogue pneumatic signal for process control systems. IEC 41
17、0:1973, Sampling plans and procedures for inspection by attributes. IEC 873:1986, Methods of evaluating the performance of electrical and pneumatic analogue chart recorders for use in industrial-process control systems. 3 Sampling for test If, by agreement between user and manufacturer, tests are to
18、 be performed on a sample lot, it is recommended that a sampling method such as presented in IEC 410 be selected. When sampling is used, recorders to be tested may be chosen by the users inspector. 4 Definitions The main terms used for measuring the physical quantities are those used in IEC 873. acc
19、eptance test the acceptance test is intended to prove to the user that the device complies with certain conditions of its requirements as they appear in the contract 5 Performance test Environmental conditions at the location of testing shall be recorded. (See 5.1 of IEC 873.) Adjustments: For zero,
20、 span and damping, the routine tests shall be carried out with the final manufacturing adjustments (e.g., as acceptance tests) or with the adjustments determined by the user (e.g., after repair). The following tests shall be performed unless another series of tests is agreed between user and manufac
21、turer. NOTEInk and paper should be in accordance with the manufacturers specifications. A chart speed of approximately20mm/h should preferably be used. 5.1 Measured error and hysteresis (Full test: see 8.1 of IEC 873.) Prior to recording observations, the device under test shall be exercised by thre
22、e full-range traverses in each direction. The input-output characteristic under reference conditions is to be measured in one measurement cycle traversing the full range in each direction. For this at least five points of measurements should be distributed over the range, e.g., in steps of 20 % from
23、 0 % to 100 % and then from 100 % to 0 %. Tapping or vibrating the instrument under test is not allowed, unless otherwise stated. Adjust the input to bring the output to the required value. Measure the input at this level and determine the difference between this input and the specified input to giv
24、e this output value. As the result, report the difference as “measured error including hysteresis” expressed in per cent of input span. NOTEFor this test, measured error is defined as the greatest positive or negative error in the measuring cycle. Hysteresis (including deadband) is defined as the gr
25、eatest difference between upscale and downscale readings which are determined at each value of output. 5.2 Effects of influence quantities 5.2.1 Power supply variations (Full test: see 9.1.1 and 9.2 of IEC 873.) Adjust the input signal to bring the output to approximately 95 % of span.BS7623:1993 2
26、BSI 10-1999 Measure and report the change of input that is necessary to bring the output level to its original value in % of span at the following variations in power supply or at the manufacturers stated limits, if smaller: 5.2.2 Overrange (Full test: see 9.14 of IEC 873.) With the input adjusted t
27、o bring the output first to approximately 5 % and then to approximately 95 % span, note the input levels. The input shall then be increased gradually to the maximum overrange specified by the manufacturer. After the overrange has been applied for 1 min, the input shall be reduced to the nominal lowe
28、r range value. After a further 5 min have elapsed, using the same output values as before, determine the changes required in input values to bring the output back to the originally used values. The changes in input determined after overranging shall be reported, expressed as per cent input span. NOT
29、EIf overranging produces significant thermal effects, the duration of application should be increased accordingly. 5.3 Recording quality The instrument shall be connected as for normal operation and an alternating input applied with a peak-to-peak amplitude equal to half the span and centred at the
30、mean of the upper and lower range input values. The frequency selected shall be such that all recorded traces can be clearly distinguished (not more than 1 cycle per millimeter chart travel). After an appropriate number of traverses it shall be noted: a) whether all traces are without interruption o
31、f the ink flow; b) whether the ink colours change over a longer distance than 5 mm after crossing different colour traces. 5.4 Paper speed With the chart-drive operating as normal, check by observing over a suitable period of time that the paper speed is within specification. 5.5 Step response With
32、the chart being driven at its fastest selectable speed, apply a suitably large step change of input signal and check that the step response of the pen mechanism is within specification. voltage variation = + 10 %, 15 % of nominal a.c. or d.c. voltage; supply pressure variation = 10 % of nominal supp
33、ly pressure.BS7623:1993 BSI 10-1999 List of references See national foreword.BS 7623:1993 IEC 1153:1992 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Eur
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