1、 STD-BSI BS EN B37-1-ENGL 1778 E lb24bb9 Ob881150 LTB = BRITISH STANDARD Pressure gauges Part 1. Bourdon tube pressure gauges - Dimensions, metrology, requirements and testing The European Standard EN 837-1 : 1996 has the status of a British Standard ICs 17.100 NO COPYTNG WITHOUT BSI PERMISSION EXCE
2、PT AS PERMITTED BY COPYRIGHT LAW BS EN 837-1 : 1998 COPYRIGHT European Committee for StandardizationLicensed by Information Handling ServicesSTD-BSI BS EN 837-1-ENGL 1998 1b24bb9 Ob88451 034 direction of the Electrotechnical Sector Board, was published under the authoring Manomtres - Partie 1: Manom
3、tres tubes de Bourdon - Dimensions, mtrologie, prescriptions et essais und pnifung Druckmel3gea - Teil 1: Druckmefigerate mit khrfedem - MaBe, Mefitchnik, .Morderungen This European Standard was approved by CEN on 19961030. CEN members are bound to comply with the CENKENELEC Internal Regulations whi
4、ch stipulate the conditions for giving this European Standard the status 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 Centrai Secretariat or to any CEN member. This European Sta
5、ndard exists in three official versions (English, French, German). A version in any other language made by transkhon under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national stand
6、ards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Cent
7、ral Secretariat: rue de Stassart 36, B-1050 Brussels O 1996 Copyright reserved to CEN members. Ref. No. EN 837-1 : 1996 E COPYRIGHT European Committee for StandardizationLicensed by Information Handling Services STD.BSI BS EN 837-1-ENGL 1778 Lb2LibbS Ob881153 907 Page 2 EN 837-1 : 1996 Foreword This
8、 European Standard has been prepared by Thermometern - Means of measuring andor recoring ternperahre during the distribution of refrigerated frozen and quick-frozen products, the secretariat of which is held by AFNOR. This European Standard shali be given the status of a national standard, either by
9、 publication of an identical text or by endorsement, at the latest by June 1997, and the latest by June 1997. This European Standard is a part of the series of the Rhnid Committee CEN/IY: 141, pI.essure - conflicting national Stan- shall be withdrawn at following stan- - EN 837-1: Pressure gauges -
10、Part 1: Bmrd4n tube pare gauges - Di-, mmlogy, requ.irements and testing; - EN 837-2 Pressure gauges - Part 2: SeectimL and instauath recommendations for pressure gauges; - EN 837-3: Pressure gauges - Part 3: Diaphragm and capsuh prmw gauges- Be, mmiogy, requin ment. and testing. According to the CE
11、NICENELEC internai Regulations, the national standards organbtions of the foilowing countries are bound to implement this European standard: Aushia, Belgium, Denmark, Finland, France, Germariy, Greece, Iceland, Ireland, Itaiy, Luxembourg, Netherlands, Norwax Portugal, Spain, Sweden, Switzerland and
12、the United Kingdom. Contents Foreword 1 Scope 2 Normative references 3 Defintions 4 Nominalsizes 6 Pressureranges 6 Accuracyclasses 7 Dimensons 8 Pressure element assembly 9 Requirements 10 Testing 11 Packaging for transportation 12 Designation Annex A (informative) Examples of scale numbering for a
13、ccuracy classes from 0,6 to 4 page 2 3 3 3 3 3 4 4 8 8 13 16 17 18 Q BSI 1998 COPYRIGHT European Committee for StandardizationLicensed by Information Handling Services STD-BSI BS EN 837-1-ENGL 1798 1b24bb7 b884511 43 * * v, 1 scope This European Standard specifies requirements for Bourdon tube (desi
14、gnated by B, see clause 12) indicating pressure gauges, vacuum gauges and combined vacuum and pressure gauges (compound gauges), with circular, spiral or coiled forms, from 40 to 250 nominai size, and with ranges up to 1600 bar, for the measurement of gauge pressure. A reading of zero bar is atmosph
15、eric pressure. 1 bar = lo5 Pa Gauges specified have circular dials with concentric scales for industrial and test use. The standard includes methods of test for performance to be applied at type approval and production piece tests. The standard applies to gauges suitable for industrial use with comm
16、on industrial fluids. It applies also to iiquid-lied gauges, gauges for high pressure gases and gauges for use with oxygen or acetylene. It does not apply to pressure gauges with electrical contacts. Pressure gauges for welding, cutting and associated processes are not included in this standard, but
17、 are specified in EN 562. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subseque
18、nt amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. Page 3 EN 837-1 : 1996 IS0 2281 : 1994 Pige threads wke pressure-tight j
19、oints are not made on the threads - Part I: Designation, dimensions and tolerances IS0 1302 : 1992 Technical drawings - Methods of indicating su?$xce texture on drawings Geneml tohnces - Part 1: Tolemnces for linea,r and angular dimensions without individual tolerance indicatwns Sampling pmcedures f
20、or inspection by attributes - Part 1: Sampling plans indexed by acceptable quality level (AQL) for lot-by-bt inspection IS0 7000 : 1989 Motor vehicZes - Graphic symbols - IS0 10102 : Assembly tools for screws and nuts - wrenches EN 227681 : 1993 IS0 2859-1 : 1989 Principles, sympsis 1990 DOuble-bdd
21、Opm-ended CWAJWCYS 3 Denitions For the purpose of this European Standard, the definitions given in EN 472 apply. 4 Nominal sizes Nominal sizes of gauges are as follows: 40, 50, 63,80, 100, 150, 160 and 250. See table 2 for dimensions. 5 Pressure ranges The bar is the preferred unit of pressure. Pres
22、sure ranges in bar o to 1 o to 10 o to 100 o to 1000 O to 1,6 O to 16 O to 160 O to 1600 EN 472 : 1994 EN 562 : 1994 Pressure gauges - Vocabulary Gas welding equipment - Pressure gauges used for welding, cutting and 0 to 2,5 0 to 25 0 to 250 allied processes O to 4 O to 40 O to 400 EN 29539 : 1992 M
23、aterials used for equipment use in gas welding, cutting and allied processes (Iso9539: 1988) EN 60529 : 1991 Degrees of protection provided by EN 600682-6 : 1995 environmental testing procedures - mbsures ElectricaL engineering - Basic Part 2: Tests - Test Fc and guidance: Vibmtion (sinusoida) EN 60
24、0682-27 : Electrical wiering - BWC 1993 enwironmmntal testing pmcedures - Part2: Tests- Test Ea and guiclance: Shock Vacuum ranges in bar Vacuum gauges have anticlockwise pointer travel with increasing vacuum. -0,6 to O Combined pressure and vacuum ranges in bas: -1 to O -1 to +0,6 -1 to +3 -1 to +9
25、 -1 to +24 -1 to +1,5 -1 to +5 -1 to +15 The SI units kilopascal (Wa) and megapascal (MPa) should follow the bar series from O to 60 kPa up to 1000 Wa, then change to O MPa to 1,6 MPa up to a maximum of 160 MPa. O BSI 1998 COPYRIGHT European Committee for StandardizationLicensed by Information Handl
26、ing Services STD=BSI BS EN 837-1-ENGL 1778 9 1b24bbS Ob88455 78T 100 150 Page 4 EN 837-1 : 1996 97 134 118 6 147 186 168 6 6 Accuracy classes The accuracy class stating the limits of permissible error is expressed as a percentage of the span. The foilowing accuracy classes are dend 071; 0725; O, 1;
27、1, 2,5 and4 (see table i). For gauges with a pointer stop, the accuracy class will cover 10 % to 100 % of the range. For gauges with a he zero, the accuracy class wiU cover O % to 100 % of the range and zero shall be used as an accuracy check point. 160 250 Table 1. Nominal size compared to the accu
28、racy class 157 196 178 6 245 290 276 7 Nominal size 40and50 Accuracy class 0,l 0,26 0,6 1 1,6 2,6 4 xxx 63 80 I Table 2. Dimensions I xxxx xxxx Nominai size 40 160 and 160 250 Dimensions in miilimetres 61 51 xxxx xxxxx 48 71 60 376 61 86 75 376 I 80 I 78 Il10 I 95 15 I NOTE. d4 elongated holes can b
29、e accepted to ensure interchangeabiiitv with DXWOUS standards. 7.3 Pressure connection The positions of the connections can be selected from table 9 (types of mounting and connection position). For thread forms and sizes, see table 3. Table 3. Thread forms and sizes Parallel pipe threads I %per pipe
30、 threads GMB G l/4B G3/8B G1/2B y827 NFT EXT 1/4-18 NFT EXT 1/2-14 NFT EXT NOTE. G 318 B is not preferred. I threaded pressure connection di Outside diameter of case entre back :onnection 3ffset back connectioi 4. ect mounting L not preferred Type not preferred 22 32 I O BSI 1998 COPYRIGHT European
31、Committee for StandardizationLicensed by Information Handling ServicesSTD-BSI BS EN 837-1-ENGL 1996 m LbZLfbbS b88459 325 m Pressure Threads Page 8 EN 837-1 : 1996 pi250bar p250bar p400baf p600bu p1000b- Nomidshe pS4bar psbar p51ooObar pSl600bar Preferred 8 Pressure element assembly Accnracy clasees
32、 Limits of permissible error (percentage of Soan) Material with RP 0,2 2 160 Nh* (e.g. brass) - i Material with Rp 0,2 2 190 N/m* (e.g. stainless steel - monel) - Material with Rp 0,2 2 260 Nh (e.g. stainless steel) 1(10l1/ NOTE. Combinations marked (- shall not be used. 0,25 0.6 9 Requirements The
33、test methods for these requirements are given in clause 10. 9.1 Accuracy The total errors of indication at reference temperaime 20 OC of the gauge shall not exceed the vaues given in table 11. Installation of the pressure gauges shall not cause any change of readings. pabe 11 shows the hits of permi
34、ssible error as a percentage of span at reference temperahre 20 OC corresponding to accuracy ciasses. f 0,25 % f 0.6 % 176 275 f 1,6 % f 2,5 % I1 (f1% O BSI 1998 COPYRIGHT European Committee for StandardizationLicensed by Information Handling Services9.2 Hysteresis Hysteresis error in pressure gauge
35、s shall not exceed the absolute value of the limits of permissible error at reference temperature 20 “C. EXAMPLE Pressure gauge with a maximum scale value of 10 bar, accuracy class 1. The maximum permissible hysteresis error is 1 Oh The difference between the readings taken at decreasing and increas
36、ing pressure shall not exceed 0,l bar (= 1 % of 10 bar). 9.3 Temperature effect The variation of indication caused by effects of temperature shall not exceed the percentage values given by the formula: where: *O, x (Q - tl)% of the span Maximum scale value of pressure gauge bar tl is the reference t
37、emperature in degrees Celsius; t2 is the ambient temperature in degrees Celsius. Number of pressure cycles 9.4 Endurance Gauges shall withstand the steady pressure, over-pressures and cyclic pressures as described below without exceeding the specified change of accuracy (see 10.4.3). For gauges with
38、 combined pressure and vacuum ranges the endurance test required may be met with gauges of positive range only with the same span. EXAMPLE A gauge with arange of -1 to + 5 bar may be substituted by a gauge with a range of O to 6 bar. 9.4.1 Gauge suitable for maximum steadg working pressure 75 % of t
39、he maximum scale value 9.4.1.1 Steady pressure The gauge shall withstand a steady pressure equal to the maximum scale value for an extended period. 9.4.1.2 Ow-pressure The gauge shall withsand the over-pressure shown in table 12 for a short period. 5 25 25to 5600 100 000 50 000 600to1600 1 i,10 x ma
40、ximum scale value I 9.4.1.3 Cyclic pressure The gauge shall withstand a pressure fluctuating from 30 % to 60 % of the maximum scale value for the number of pressure cycles shown in table 13. Maximum scale value of pressure gauge bar 5 100 100 to 5 600 Page 9 EN 837-1 : 1996 Over-pressure to be appli
41、ed 1,25 X maximum scale value 1.15 X maximum scale value 9.4.2 Gauges suitable for maximum steady working pressure equal to the maximum scale value 9.4.2.1 Steady pressure and over-pressure The gauge shail withstand a steady pressure of 1,3 times the maximum scale value for an extended period. 9.4.2
42、.2 Cyclic pressure The gauge shall withstand a pressure fluctuating between 30 % and 95 % of the maximum scale value for 200 O00 cycles. 15 O00 cycles are sufficient for gauges of classes 0,l; 0,25 and 0,6. 9.6 Operating conditions 9.6.1 Rated temperatures in service Ambient temperature and temperat
43、ure of the fluid under pressure: -20 “C to + 60 “C Minimum and maximum temperature in service for liquid-filled gauges shali be in accordance with the liquid properties. 9.6.2 Rated storage temperature Storage temperature: -40 “C to +70 “C. The gauge shd not change its appearance. The dial and point
44、er shall not crack, blister or change colour. 9.5.3 Protection against ingress of water and foreign particles (degree of protection) Recommended minimum protection ratings in accordance with EN 60529 - for indoor use: P 31; - for outdoor use: IP 44. 9.6.4 Eflect of mechanical shock After the applica
45、tion of shock loads of 150 ds2, the gauge shall remain within its accuracy class. The shock test is required for gauges with accuracy classes 1 to 4 only 9.6.6 Eflect of mechanical vibration The gauge shall be subjected to vibrations on three orthogonal axes of the following conditions: - accelerati
46、on 5 m/s2; - range of frequency from 10 Hz to 150 Hz; - scan rate 1 octave per minute for the period of 2 h per axis. The change of indication after the vibration test shall not exceed 0,5 times class. The vibration test is required for gauges of accuracy classes 1 to 4 only O ES1 1998 COPYRIGHT Eur
47、opean Committee for StandardizationLicensed by Information Handling ServicesPage 10 EN 837-1 : 1996 9.6.6 Leak rate The leak rate shall not exceed 5 X mbar Vs. 9.6.7 Mounting position Avariation of the nominai mountjng position of * 5“ shaU not give a change of indidon of more than 0,5 imes class. 9
48、.6 Dials and pointers 9.6.1 Scale angk The scale normally covers 270“ of arc, but may be longer for accuracy ciasses 0,1, 0,25 and 0,6. 9.6.2 Scale intend ?he scale intervai shal be a value that represents 1 X lon, 2 X 1On or 5 X 1On of the pressure unit, where n is the whole number which can be pos
49、itive, negative or zero. The minimum number of minor scale divisions for each class of accuracy and size of gauge are as shown in table 14. For illustrative examples see annex A. 9.6.3 Scale mark 9.6.3.1 The thicknes of the scale marks shall not exceed U5 of the scale spacing. Examples are shown in annex A Table 14. Minimum number of minor scale divisions Nominal size Scale oto100 Minimum number of minor scale divisions Accuracy classes 1 196 20 20 20 2.6 20 20 20 4 20 20 20 50 - - - 40 50 63 - - 200 200 - 100 100 100 50 50 50 50 50 50
