1、BRITISH STANDARD BS1794:1952 Specification for Chart ranges for temperature recording instrumentsBS1794:1952 This British Standard, having been approved by the InstrumentIndustry StandardsCommittee andendorsed by the Chairmanofthe EngineeringDivisional Council,was published undertheauthority of the
2、GeneralCouncil on 16April1952 BSI 10-1999 ISBN 0 580 35608 6 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 organiz
3、ations: Admiralty Engineering Equipment Users Association* Association of Scientific Workers Gauge and Tool Makers Association British Ceramic Research Association Incorporated Association of Kinematograph British Clock and Watch Manufacturers Manufacturers Limited Association Institute of Physics B
4、ritish Electrical and Allied Industries Institution of Chemical Engineers Research Association Institution of Electrical Engineers* British Electrical and Allied Manufacturers Institution of Heating and Ventilating Association* Engineers British Electricity Authority and Area Institution of Mechanic
5、al Engineers* Boards* Iron and Steel Institute British Industrial Measuring and Control Meteorological Office Apparatus Manufacturers Association* Ministry of Education British Iron and Steel Federation* Ministry of Health British Nautical Instrument Trade Ministry of Housing and Local Government As
6、sociation Ministry of Supply* British Non-Ferrous Metals Federation National Coal Board British Photographic Manufacturers National Physical Laboratory* Association Limited Oil Companies Materials Committee* British Railways, The Railway Executive Radio Industry Council British Scientific Instrument
7、 Research Scientific Instrument Manufacturers Association* Association* Council of British Manufacturers of Society of Instrument Technology Petroleum Equipment Water-Tube Boilermakers Association The Government departments and scientific and industrial organizations marked with an asterisk in the a
8、bove list, together with the following, were directly represented on the committees entrusted with the preparation of this standard: British Coal Utilization Research Institute of Metals Association Physical Society Gas Council Society of Chemical Industry Amendments issued since publication Amd. No
9、. Date CommentsBS1794:1952 BSI 10-1999 i Contents Page Co-operating organizations Inside front cover Foreword ii Table 1 Even scale recorders (gas expansion, mercury-in-steel, etc.) C. and F 1 Table 2 Base metal thermocouple recorders C 2 Table 3 Base metal thermocouple recorders F 2 Table 4 Platinu
10、m/rhodium v platinum thermocouple recorders C 2 Table 5 Platinum/rhodium v platinum thermocouple recorders F 2 Table 6 Resistance thermometer recorders C 3 Table 7 Resistance thermometer recorders F 3 Table 8 Radiation pyrometer recorders C 3BS1794:1952 ii BSI 10-1999 Foreword This British Standard,
11、 which has been prepared under the aegis of the Instrument Industry Standards Committee, makes recommendations for the temperature ranges of charts used in recording instruments actuated by: Gas expansion Mercury-in-steel Platinum/rhodium v platinum thermocouple Resistance thermometer Radiation pyro
12、meter As the preferred ranges have been compiled from data supplied by many instrument manufacturers their calculation has been achieved by grouping and consolidating the ranges favoured by individual users. Where minor differences in starting point and range were encountered during compilation they
13、 were embodied, wherever possible, in one range containing their maximum and minimum temperatures. It will be readily appreciated that there are in use many preferred ranges which are peculiar to a particular industry or process; these have been included in the ranges specified in this standard. In
14、most cases these special ranges have developed from the need to provide openness of scale at important temperatures and their use requires some special arrangement of the measuring system in order to provide the necessary sensitivity. Although these chart ranges embrace the whole of the useful tempe
15、rature scale it is appreciated that not every instrument manufacturer will be in a position to adopt them in their entirety, especially since some of them are for use in conjunction with particular types of measuring systems. Further, the use of the whole of such a comprehensive selection of ranges
16、is unnecessary when instruments are manufactured for a particular section of industry. The ranges for base metal thermocouples are not classified according to their various types, viz., copper v constantan, 1)iron v constantan, and nickel/chromium v nickel/aluminium (chromel v alumel and T 1alloy v
17、T 2alloy types) 2)as most ranges have been used up to the individual maximum working temperatures. Due to the different characteristics of the temperature/thermo-electric relationships of the couples, charts of the same temperature range require different spacings according to the thermocouple being
18、 used. Hence, the total number of different charts required is considerably greater than the number of chart ranges tabulated. Suggested preferred ranges for temperature recorders The suggested preferred ranges for temperature recorders are given in the following tables: Table 1 Even scale recorders
19、 (gas expansion, mercury-in-steel, etc.) C. and F Table 2 Base metal thermocouple recorders C Table 3 Base metal thermocouple recorders F Table 4 Platinum/rhodium v platinum thermocouple recorders C Table 5 Platinum/rhodium v platinum thermocouple recorders F Table 6 Resistance thermometer recorders
20、 C Table 7 Resistance thermometer recorders F Table 8 Radiation pyrometer recorders C. 1) Constantan. The generally accepted name of an alloy having a nominal composition of approximately5560per cent copper,4540per cent nickel. 2) Attention is drawn to the fact that the names chromel, alumel, T 1all
21、oy and T 2alloy are proprietary trade names.BS1794:1952 BSI 10-1999 iii 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 im
22、munity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi to iv, pages1 to4, 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 a
23、mendment table on the inside front cover.iv blankBS 1794:1952 BSI 10-1999 1 Table 1 Even scale recorders (gas expansion, mercury-in-steel, etc.) C. and F Starting temperature Maximum temperature on chart 150 100 50 30 20 10 0 20 50 100 150 200 300 20 30 50 70 80 50 70 80 100 120 150 110 50 100 130 1
24、50 200 250 200 220 250 300 400 500 100 250 150 300 350 400 500 400 500 550 500 600 800 600 800 700 800 1000 900 1000 Temp. range 50 80 100 110 150 200 250 300 400 500 600 700 800 900 1000BS1794:1952 2 BSI 10-1999 Table 2 Base metal thermocouple recorders C Table 3 Base metal thermocouple recorders F
25、 Table 4 Platinum/rhodium v platinum thermocouple recorders C Table 5 Platinum/rhodium v platinum thermocouple recorders F Starting temperature Maximum temperature on chart 200 150 100 50 0 100 150 200 250 300 400 500 600 700 100 300 100 150 200 300 350 400 500 600 500 100 150 250 400 500 550 600 90
26、0 400 500 600 500 700 800 900 1000 600 800 900 1000 1100 1200 1300 650 700 1300 800 1000 1200 1200 1000 1200 1100 1200 Temp. range 150 200 250 300 400 500 600 700 800 900 1000 1100 1200 NOTEThe maximum temperatures are limited by the maximum permissible working temperatures of the base metal. Starti
27、ng temperature Maximum temperature on chart 150 20 0 250 500 750 100 250 500 150 300 400 500 750 1000 1250 750 1000 1000 1500 1250 1500 2000 1750 2500 2000 2500 Temp. range 250 300 400 500 750 1000 1250 1500 1750 2000 2500 Starting temperature Maximum temperature on chart 0 300 500 600 700 800 1000
28、1250 1000 1500 1750 1300 1400 1000 1300 800 1600 1000 1500 1400 1200 1500 1400 1500 1600 Temp. range 500 600 700 800 1000 1100 1200 1400 1500 1600 Starting temperature Maximum temperature on chart 0 1000 2000 3000BS1794:1952 BSI 10-1999 3 Table 6 Resistance thermometer recorders C Table 7 Resistance
29、 thermometer recorders F Table 8 Radiation pyrometer recorders C Starting temperature Maximum temperature on chart 200 100 50 20 0 50 100 10 50 100 20 60 50 100 200 20 120 110 150 200 160 0 100 150 200 250 300 100 300 500 400 500 600 Temp. range 30 50 70 80 100 120 130 150 180 200 300 400 500 600 St
30、arting temperature Maximum temperature on chart 150 30 20 10 0 50 100 200 400 70 80 90 100 150 200 300 130 140 150 50 180 200 250 300 400 100 250 150 350 400 400 600 800 550 600 800 1000 800 1000 1000 1100 Temp. range 100 150 200 250 300 400 500 600 700 800 900 1000 1100 Starting temperature Maximum
31、 temperature on chart 500 700 800 900 1000 1200 1000 1400 1600 1800 2000 2400 Temp. range 500 700 800 900 1000 12004 blankBS1794:1952 BSI 10-1999 British Standards The following are available on application: YEARBOOK Including subject index and numerical list of British Standards SECTIONAL LISTS. Gr
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