1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 837-1 : 1998 The Eu
2、ropean Standard EN 837-1 : 1996 has the status of a British Standard ICS 17.100 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Pressure gauges Part 1. Bourdon tube pressure gauges Dimensions, metrology, requirements and testingThis British Standard, having been prepared under
3、 the direction of the Electrotechnical Sector Board, was published under the authority of the Standards Board and comes into effect on 15 March 1998 BSI 1998 ISBN 0 580 28893 5 BS EN 837-1 : 1998 Amendments issued since publication Amd. No. Date Text affected National foreword This British Standard
4、is the English language version of EN 837-1 : 1996, and it includes the corrections to table A.2 issued on 1997-02-20. It supersedes BS 1780 : 1985 which is withdrawn. The UK participation in its preparation was entrusted by Technical Committee GEL/65, Measurement and control, to Subcommittee GEL/65
5、/2, Elements of systems, which has the responsibility to: aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and
6、promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue unde
7、r the section entitled International Standards Correspondence Index, or by using the Find facility of the BSI Standards Electronic Catalogue. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an insid
8、e front cover, the EN title page, pages 2 to 21 and a back cover.CEN European Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1996 Copyright reserved to CEN members. Ref. No. EN 837-1 : 1996 E
9、 EUROPEAN STANDARD EN 837-1 NORME EUROPE ENNE EUROPA ISCHE NORM December 1996 ICS 17.100 Descriptors: Metrology, measuring instruments, manometers, vacuum gauges, indicating instruments, designation, specifications, dimensions, fidelity, safety, metrology inspection, marking English version Pressure
10、 gauges Part 1: Bourdon tube pressure gauges Dimensions, metrology, requirements and testing Manome tres Partie 1: Manome tres a tubes de Bourdon Dimensions, me trologie, prescriptions et essais Druckmegera te Teil 1: Druckmegera te mit Rohrfedern Mae, Metechnik, Anforderungen und Pru fung This Euro
11、pean Standard was approved by CEN on 1996-10-30. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concer
12、ning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own l
13、anguage and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland a
14、nd United Kingdom.Page 2 EN 837-1 : 1996 BSI 1998 Foreword This European Standard has been prepared by Technical Committee CEN/TC 141, Pressure gauges Thermometers Means of measuring and/or recording temperature during the distribution of refrigerated frozen and quick-frozen products, the secretaria
15、t of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by June 1997, and conflicting national standards shall be withdrawn at the latest by June 1997. This European Standard is
16、a part of the series of the following standards: EN 837-1: Pressure gauges Part 1: Bourdon tube pressure gauges Dimensions, metrology, requirements and testing; EN 837-2: Pressure gauges Part 2: Selection and installation recommendations for pressure gauges; EN 837-3: Pressure gauges Part 3: Diaphra
17、gm and capsule pressure gauges Dimensions, metrology, requirements and testing. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greec
18、e, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Definitions 3 4 Nominal sizes 3 5 Pressure ranges 3 6 Accuracy classes 4 7 Dimensions 4 8 Pressure element assembly
19、8 9 Requirements 8 10 Testing 13 11 Packaging for transportation 16 12 Designation 17 Annex A (informative) Examples of scale numbering for accuracy classes from 0,6 to 4 18Page 3 EN 837-1 : 1996 BSI 1998 1 Scope This European Standard specifies requirements for Bourdon tube (designated by B, see cl
20、ause 12) indicating pressure gauges, vacuum gauges and combined vacuum and pressure gauges (compound gauges), with circular, spiral or coiled forms, from 40 to 250 nominal size, and with ranges up to 1600 bar, for the measurement of gauge pressure. A reading of zero bar is atmospheric pressure. 1 ba
21、r = 10 5 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 common industrial flu
22、ids. It applies also to liquid-filled 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 are specified
23、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, subsequent amendments t
24、o 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. ANSI/ASME B1.20.1 Pipe threads, general purpose (inch) EN 472 : 1994 Pressure gauges Vo
25、cabulary EN 562 : 1994 Gas welding equipment Pressure gauges used for welding, cutting and allied processes EN 29539 : 1992 Materials used for equipment used in gas welding, cutting and allied processes (ISO 9539 : 1988) EN 60529 : 1991 Degrees of protection provided by enclosures EN 60068-2-6 : 199
26、5 Electrical engineering Basic environmental testing procedures Part 2: Tests Test Fc and guidance: Vibration (sinusoidal) EN 60068-2-27 : 1993 Electrical engineering Basic environmental testing procedures Part 2: Tests Test Ea and guidance: Shock ISO 228-1 : 1994 Pipe threads where pressure-tight j
27、oints are not made on the threads Part 1: Designation, dimensions and tolerances ISO 1302 : 1992 Technical drawings Methods of indicating surface texture on drawings EN 22768-1 : 1993 General tolerances Part 1: Tolerances for linear and angular dimensions without individual tolerance indications ISO
28、 2859-1 : 1989 Sampling procedures for inspection by attributes Part 1: Sampling plans indexed by acceptable quality level (AQL) for lot-by-lot inspection ISO 7000 : 1989 Motor vehicles Graphic symbols Principles, synopsis ISO 10102 : 1990 Assembly tools for screws and nuts Double-headed open-ended
29、engineers wrenches 3 Definitions 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. P
30、ressure ranges in bar: 0t o0 , 6 0t o6 0t o6 0 0t o6 0 0 0 to 1 0 to 10 0 to 100 0 to 1000 0 to 1,6 0 to 16 0 to 160 0 to 1600 0 to 2,5 0 to 25 0 to 250 0t o4 0t o4 0 0t o4 0 0 Vacuum ranges in bar: Vacuum gauges have anticlockwise pointer travel with increasing vacuum. 20,6 to 0 21t o0 Combined pre
31、ssure and vacuum ranges in bar: 21 to +0,6 21t o+ 3 2 1t o+ 9 2 1 to +24 21 to +1,5 21t o+ 5 2 1 to +15 The SI units kilopascal (kPa) and megapascal (MPa) should follow the bar series from 0 to 60 kPa up to 1000 kPa, then change to 0 MPa to 1,6 MPa up to a maximum of 160 MPa.Page 4 EN 837-1 : 1996 B
32、SI 1998 d 1 Outside diameter of case d 2 Outside diameter of flange d 3 Diameter of fixing hole circle d 4 Diameter of fixing holes Figure 1 6 Accuracy classes The accuracy class stating the limits of permissible error is expressed as a percentage of the span. The following accuracy classes are defi
33、ned: 0,1; 0,25; 0,6; 1; 1,6; 2,5 and 4 (see table 1). For gauges with a pointer stop, the accuracy class will cover 10 % to 100 % of the range. For gauges with a free zero, the accuracy class will cover 0 % to 100 % of the range and zero shall be used as an accuracy check point. Table 1. Nominal siz
34、e compared to the accuracy class Nominal size Accuracy class 0,1 0,25 0,6 1 1,6 2,5 4 40 and 50 X X X 6 3 XXXX 8 0 XXXX 1 0 0 XXXX 1 5 0 a n d 1 6 0 XXXX 2 5 0 XXXXX 7 Dimensions 7.1 General tolerances General tolerances: EN 22768-1. 7.2 Cases and flanges The user will have to determine the dimensio
35、ns for panel cut-out according to the manufacturers data. Table 2. Dimensions Dimensions in millimetres Nominal size d 1 d 2 d 3 d 4 40 38 61 51 3,6 50 48 71 60 3,6 63 61 86 75 3,6 80 78 110 95 5 100 97 134 118 6 150 147 186 168 6 160 157 196 178 6 250 245 290 276 7 NOTE. d 4 elongated holes can be
36、accepted to ensure interchangeability with previous 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 Taper pipe
37、threads G 1/8 B 1/8-27 NPT EXT G 1/4 B 1/4-18 NPT EXT G 3/8 B G 1/2 B 1/2-14 NPT EXT NOTE. G 3/8 B is not preferred.Page 5 EN 837-1 : 1996 BSI 1998 Table 4. Dimensions of parallel threaded shanks Dimensions in millimetres Thread size d 2 d 3 d 4 l 1 l 2 l 3 fw d 1 min. 0 +0,5 0 +0,5 min. G 1/8 B 4 8
38、 8 10 2 2 1,6 8 G 1 / 4 B59 , 59 , 51 32221 0 G 3 / 8 B5 , 51 31 31 63321 3 G 1/2 B 6 17,5 17,5 20 3331 7 NOTE 1. For stainless steel screwed connection, f dimensions can be raised up to 50 %. NOTE 2. G 1/8 B may be made without spigot. NOTE 3. G 1/8 B may be made without groove f. In this case, the
39、 length of threading shall be equal to l 1 . NOTE 4. For inchangeability with previous standards, the spigot of G 1/4 B can be manufactured with diameter 4 mm. 1) According to ISO 1302. 7.3.1 Screw threads Parallel pipe threads (symbol G) according to ISO 228-1. Taper pipe threads (symbol NPT) accor
40、ding to ANSI/ASME B1.20.1. Other threads specific to certain industries are acceptable. 7.3.2 Shanks with parallel pipe threads NOTE. Minimum height h of flats shall be compatible with use of standard spanners according to ISO 10102. Figure 2 7.3.3 High pressure shank (HP) for connection with lens s
41、eal Figure 3 Table 5. Dimensions for high pressure shank Dimensions in millimetres Thread size d 1 d 2 0,1 d 3 d 4 d 5 20,3 0 l 1 20,3 0 l 2 20,3 0 G 1/2 B (for HP) 7,14 15 17,5 19 25 22Page 6 EN 837-1 : 1996 BSI 1998 1) According to ISO 1302. 7.3.4 Shanks with taper pipe threads Figure 4 Table 6. D
42、imensions of taper threaded shanks Dimensions in millimetres Thread size d 1 l 1 min. w min. 1/8-27 NPT EXT 10 8 1/4-18 NPT EXT 13 10 1/2-14 NPT EXT 18 17 NOTE. Height of flats (h) shall be compatible with use of standard spanners according to ISO 10102. 7.3.5 Parallel threaded tapped holes Figure 5
43、 Table 7. Dimensions of parallel threaded tapped holes Dimensions in millimetres Thread size d 1 d 2 t 1 20,5 t 2 min. G 1/8 4,5 10 7,5 G 1/4 5,5 13 10 G 3/8 6,5 16 12 G 1/2 7 19 15 7.3.6 Sealing washers For use with parallel screw threads only. NOTE. The choice of the sealing washer material depend
44、s on the pressure and the fluid to be measured. Figure 6 Table 8. Dimensions of sealing washers Dimensions in millimetres Thread size d 2 d 3 e 0,2 G 1/8 B 4,2 0 +0,2 8 20,2 0 1,5 G 1/4 B 5,2 0 +0,2 9,5 20,2 0 1,5 G 3/8 B 5,7 0 +0,3 13 20,3 0 2 G 1/2 B 6,2 0 +0,4 17,5 20,5 0 2 7.3.7 Sealing lens For
45、 use with high pressure shank (HP) only, according to 7.3.3. Figure 7Page 7 EN 837-1 : 1996 BSI 1998 Table 9. Type of mounting and connection position Radial connection 10 11 12 Type not preferred Centre back connection 20 21 22 23 Type not preferred Offset back connection 30 31 32 33 Type not prefe
46、rred Direct mounting Surface mounting Flush mounting Three-hole fixing Clamp fixing 7.4 Type of mounting and connection position The different mounting types of gauges shall be as given in table 9. When mounting, ensure that there is enough free space for the blow-out device, if any.Page 8 EN 837-1
47、: 1996 BSI 1998 8 Pressure element assembly 9 Requirements The test methods for these requirements are given in clause 10. 9.1 Accuracy The total errors of indication at reference temperature 208C of the gauge shall not exceed the values given in table 11. Installation of the pressure gauges shall n
48、ot cause any change of readings. Table 11 shows the limits of permissible error as a percentage of span at reference temperature 208C corresponding to accuracy classes. Table 11. Maximum permissible errors Accuracy classes Limits of permissible error (percentage of span) 0,1 0,1 % 0,25 0,25 % 0,6 0,
49、6 % 1 1% 1,6 1,6 % 2,5 2,5 % 4 4%Page 9 EN 837-1 : 1996 BSI 1998 9.2 Hysteresis Hysteresis error in pressure gauges shall not exceed the absolute value of the limits of permissible error at reference temperature 208C. EXAMPLE Pressure gauge with a maximum scale value of 10 bar, accuracy class 1. The maximum permissible hysteresis error is 1 %. The difference between the readings taken at decreasing and increasing pressure shall not exceed 0,1 bar (= 1
