《BS-3231-1960.pdf》由会员分享,可在线阅读,更多相关《BS-3231-1960.pdf(8页珍藏版)》请在三一文库上搜索。
1、BRITISH STANDARD BS 3231:1960 Specification for Thermographs (Bimetallic type) For air temperatures within the range 0 F to 140 F ( 20 C to 60 C) Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 03:47:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3231:1960 This British Standard, having been
2、 approved by the Instrument Industry Standards Committee and endorsed by the Chairman of the Engineering Divisional Council, was published under the authority of the General Council on 17 March 1960 BSI 04-2000 The following BSI references relate to the work on this standard: Committee references IN
3、E/4 and INE/4/7 Draft for comment A(INE) 594 ISBN 0 580 34576 9 Co-operating organizations The Instrument Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial orga
4、nizations: Association of Scientific Workers British Ceramic Research Association British Clock and Watch Manufacturers Association British Electrical and Allied Industries Research Association British Electrical and Allied Manufacturers Association* British Industrial Measuring and Control Apparatu
5、s Manufacturers Association* British Iron and Steel Federation* British Nautical Instrument Trade Association British Railways, The British Transport Commission British Scientific Instrument Research Association* Council of British Manufacturers of Petroleum Equipment Electricity Council, the Genera
6、ting Board and the Area Boards in England and Wales* Engineering Equipment Users Association* Gauge and Tool Makers Association Institute of Physics Institution of Chemical Engineers Institution of Electrical Engineers* Institution of Heating and Ventilating Engineers* Institution of Mechanical Engi
7、neers* Iron and Steel Institute Meteorological Office Ministry of Aviation* Ministry of Health Ministry of Housing and Local Government National Coal Board National Physical Laboratory (D.S.I.R.)* Oil Companies Materials Association* Radio Industry Council Scientific Instrument Manufacturers Associa
8、tion* Society of Instrument Technology Water-tube Boilermakers Association The Government departments and scientific and industrial organizations marked with an asterisk in the above list, together with the following, were directly represented on the Committee entrusted with the preparation of this
9、British Standard: Admiralty Air ministry British Coal Utilization Research Association Gas Council Ministry of Power Ministry of Works Physical Society Refrigerated Cargo Research Council Society of Chemical Industry War Office Individual manufacturers and users Amendments issued since publication A
10、md. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 03:47:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3231:1960 BSI 04-2000i Contents Page Co-operating organizationsInside front cover Forewordii 1Scope1 2Materials1 3Design and construction1 4Temperature range1 5Accuracy1
11、6Lag (response)1 7Testing1 8Marking2 9Packaging2 Appendix A General recommendations for despatch by manufacturer and subsequent movement by customer from site to site3 Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 03:47:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3231:1960 ii BSI 04-20
12、00 Foreword This standard makes reference to the following British Standards: BS 1133, Packaging code. BS 1986, Dimensional features of measuring and control instruments and panels for industrial purposes. BS 2548, Wood wool for general packaging purposes. BS 2770, Recommendations for the pictorial
13、marking of handling instructions for non-dangerous goods. This British Standard is one of a series prepared under the authority of the Instrument Industry Standards Committee at the request of the Temperature Measuring Instruments Sub-Committee of the Joint Equipment Standardization Committee. It is
14、 intended to cover Service requirements for a thermograph to record air temperatures, as well as the requirements for certain industrial and marine uses. NOTEWhere metric equivalents are stated, the figures in British units are to be regarded as the standard. The metric conversions are approximate.
15、More accurate conversions should be based on the tables in BS 350, “Conversion factors and tables”. 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
16、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 3 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicate
17、d in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 03:47:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3231:1960 BSI 04-20001 1 Scope This British Standard relates to thermographs of the bimetallic type, for general and marine use in obtaini
18、ng a continuous record of air temperatures within the range 0 F to 140 F ( 20 C to 60 C). Such an instrument comprises a bimetallic element, the response of which to temperature changes controls the movement of a pen, and a clock-driven drum carrying a chart on which the pen movement records against
19、 a temperature scale. A louvred screen may be used to protect the instrument during exposure, but the screen is not included in this British Standard. If the instrument is to be used in conditions where vibration or violent movement is likely, shock absorbers or some other suitable device may be req
20、uired to ensure that the specified accuracy is maintained. 2 Materials Wherever possible, the materials of construction shall be selected to avoid the possibility of electrolytic or atmospheric corrosion. The bimetallic element shall have received an appropriate stress-relieving treatment to ensure
21、freedom from hysteresis. It shall also receive a suitable surface treatment to resist corrosion. 3 Design and construction The thermograph shall preferably use one of the types of drum and chart described in BS 19861). The recorder shall be provided with a suitable cover, with windows on at least th
22、e three sides which embrace the drum, or alternatively with a single window on the side on which the record is being traced, so arranged as to provide free access for removal and replacement of charts. These windows shall be of permanently transparent, non-flammable material. A mechanism for withdra
23、wing the pen from the chart shall also be fitted, operated from outside the cover. The bimetallic element may be of any convenient form, such as a helix, a spiral or a cantilever, arranged to record low temperatures at the bottom of the chart. The position of the fixed end shall be adjustable, e.g.
24、by a fine-adjustment screw and spring. The element shall be protected from damage by a guard of minimum heat capacity, so constructed as to allow free passage of air. A clip shall be provided on the guard to carry a thermometer for air temperature measurement. If ink is used, provision shall be made
25、 for the safe storage of a container within the instrument. 4 Temperature range The nominal range of the instrument shall be either 80 degF or 100 degF, within the extremes of 0 F and 140 F. When specially ordered, provision may be made for recording down to 40 F. A zero adjustment of at least 25 pe
26、r cent of the nominal range shall be provided, of such construction that a screwdriver or other tool can be used for fine control. 5 Accuracy When the temperature is changed by 50 degF over any interval between 0 F and 140 F, the indicated difference in temperature shall not be in error by more than
27、 1 degF when tested in accordance with Clause 7 a). 6 Lag (response) When any change in ambient temperature takes place, the instrument shall record at least two-thirds of such change within 30 seconds when tested in accordance with Clause 7 b). 7 Testing a) Accuracy. The clock shall be removed to a
28、void damage and a metal strip bearing the appropriate scale substituted, the pen arm pressure on the strip being adjusted to simulate pen/paper friction. The instrument shall then be tilted at an angle of 10 degrees and the element immersed alternately in recirculating water baths differing in tempe
29、rature by 50 degF. The difference in temperature shall be indicated to the accuracy specified in Clause 5. b) Response2). The instrument shall be raised about 40 degF above ambient temperature by inserting it in a suitably heated recirculating air oven for at least 30 minutes. The instrument shall t
30、hen be withdrawn from the oven and placed in a current of air moving towards the element at not less than 15 ft/sec (5 m/sec). At least two-thirds of the difference in temperature shall be recorded within 30 seconds (Note), as required by Clause 6. 1) BS 1986, “Dimensional features of measuring and
31、control instruments and panels for industrial processes”. 2) Instruments of identical design may be expected to have the same response time and it will generally only be necessary for a type test to be carried out. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 03:47:17 GMT+00:00 2006, Uncon
32、trolled Copy, (c) BSI BS 3231:1960 2 BSI 04-2000 c) Certification. Certification of thermographs shall normally be carried out by a recognized testing station, but periodic checks on performance and examination for general compliance with this specification may be conducted in the manner described a
33、bove. NOTEAn instrument complying with Clause 6 is likely to have a response of about 3 seconds if the test described above is carried out using two water baths in place of an air oven and a current of air. 8 Marking The following information shall be permanently marked on the instrument in a conven
34、ient position for ready reference, preferably on the cover: a) The manufacturers name or trade mark. b) A serial number. c) The number of this British Standard, i.e. “BS 3231”. d) The nominal range of the instrument. NOTEThe mark “BS 3231” on a product is an indication by the manufacturer that it pu
35、rports to comply with the requirements of this British Standard. The British Standards Institution is the owner of the registered certification trade mark shown below. The presence of the certification mark on a product is an additional independent assurance that the product does comply with the req
36、uirements of the relevant British Standard. This certification mark may be used by the manufacturer only under licence from the BSI and particulars of the conditions under which licences are granted may be obtained from the Director, British Standards Institution, 2 Park Street, London, W.1. 9 Packa
37、ging The instrument shall be packed for transit in such a manner as to minimize the possibility of accidental damage3). Detailed recommendations are given in Appendix A. 3) General guidance on methods of packaging and packaging materials is given in BS 1133, “Packaging Code”. Licensed Copy: sheffiel
38、dun sheffieldun, na, Wed Nov 29 03:47:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3231:1960 BSI 04-20003 Appendix A General recommendations for despatch by manufacturer and subsequent movement by customer from site to site a) Packaging. 1) Allow clock to run down. 2) Remove ink from pen-nib (ab
39、sorb by blotting paper). 3) If reserve ink is contained within the recorder remove the container and pack separately. 4) Operate pen lifter and fix by tying with thread or by using a rubber band, so that the pen-nib cannot hammer the chart drum while in transit. 5) Lock lid, or failing locking arran
40、gement tie with broad tape, so as to prevent the instrument opening if the package is inverted. 6) Cover windows with plywood, fibreboard or very stout paperboard fixed with adhesive tape, thus transferring padding pressure strain to the instrument case. 7) Enclose the instrument in a stout containe
41、r with suitable cushioning, sufficient to withstand normal transit risks, to prevent movement of the instrument within the container. b) Transport. 1) For local delivery by vehicle or for postal or air transport the container is sufficient. 2) For rail transport put container(s) inside a larger cont
42、ainer with wood wool4) cushioning. 3) For sea transport enclose container(s) in strong cases with wood wool4) cushioning. 4) Provide usual warnings of fragility in English for internal transportation but use the appropriate international “Fragile” sign for export5). 4) See BS 2548, “Wood wool for ge
43、neral packaging purposes”. 5) Attention is drawn to BS 2770, “Recommendations for the pictorial marking of handling instructions for non-dangerous goods”. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 03:47:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3231:1960 BSI 389 Chiswick High Roa
44、d London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment
45、 or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would
46、inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel: 020 8996 9000. Fax: 020 8996 7400. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of
47、 standards. Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel: 020 8996 9001. Fax: 020 8996 7001. In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have
48、been published as British Standards, unless otherwise requested. Information on standards BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service. Various BSI electronic information services are also a
49、vailable which give details on all its products and services. Contact the Information Centre. Tel: 020 8996 7111. Fax: 020 8996 7048. Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. For details of these and other benefits contact Membership Administration. Tel: 020 8996 7002. Fax: 020 8996 7001. Copyright Copyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of the publications of the international standardization bodies.
链接地址:https://www.31doc.com/p-3732657.html