1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 837-3:1998 The Euro
2、pean Standard EN 837-3:1996 has the status of a British Standard ICS 17.100 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Pressure gauges Part 3: Diaphragm and capsule pressure gauges Dimensions, metrology, requirements and testingThis British Standard, having been prepared
3、under the direction of the Electrotechnical Sector Board, was published under the authority of the Standards Board and comes into effect on 15 July 1998 BSI 1998 ISBN 0 580 28895 1 BS EN 837-3:1998 Amendments issued since publication Amd. No. Date Text affected National foreword This British Standar
4、d is the English language version of EN 837-3:1996 published by the European Committee for Standardization (CEN). It includes the corrections issued on 1997-02-20. The UK participation in its preparation was entrusted by Technical Committee GEL/65, Measurment and control, to Subcommittee GEL/65/2, E
5、lements 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 promu
6、lgate 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 under the
7、 section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct applica
8、tion. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 22, an inside back cover and a back cover.CEN European Committee for Standardization Comite
9、 Europe en de Normalisation Europa isches Komitee fu r Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1996 All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 837-3:1996 E EUROPEAN STANDARD EN 837-3 NORME EUROPE ENNE EURO
10、PA ISCHE NORM December 1996 ICS 17.100 Descriptors: Metrology, measuring instruments, pressure measurements, manometers, indicating instruments, dimensions, fidelity, measuring scales, specifications, metrological inspection, tests, packing, designation English version Pressure gauges Part 3: Diaphr
11、agm and capsule pressure gauges Dimensions, metrology, requirements and testing Manome tres Partie 3: Manome tres a membrane et manome tres a capsule Dimensions, me trolgie, prescriptions et essais Druckmebgera te Teil 3: Druckmebgera te mit Platten- und Kapselfedern Mabe, Mebtechnik, Anforderungen
12、und Prufung This European 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 bibliographi
13、cal references concerning 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
14、member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, P
15、ortugal, Spain, Sweden, Switzerland and United Kingdom.Page 2 EN 837-3:1996 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 qu
16、ick-frozen products, the secretariat 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 Ju
17、ne 1997. This European Standard is 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
18、-3, Pressure gauges Part 3: Diaphragm 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, Czech
19、 Republic, Denmark, Finland, France, Germany, Greece, 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 cl
20、asses 4 7 Dimensions 4 8 Wetted parts 10 9 Requirements 10 10 Testing 13 11 Packaging for transportation 15 12 Designation 16 Annex A (informative) Examples of scale numbering for accuracy classes from 0,6 to 4 17 Annex B (informative) Examples of flanged and special connections 22Page 3 EN 837-3:19
21、96 BSI 1998 1 Scope This European Standard specifies requirements for diaphragm and capsule (designated by D and C respectively, see clause 12) indicating pressure gauges, vacuum gauges and combined vacuum and pressure gauges (compound gauges), from 50 to 250 nominal size with ranges up to 25 bar fo
22、r the measurement of gauge pressure. A reading of zero bar is atmospheric pressure. 1 bar = 10 5 Pa. Gauges specified have circular dials with concentric scales for industrial use. The standard includes methods of test for performance to be applied at type approval and production piece tests. The st
23、andard applies to gauges suitable for industrial use with common industrial fluids. It does not apply to pressure gauges for oxygen or acetylene use nor gauges with electrical contacts. Pressure gauges for welding, cutting and associated processes are not included in this standard, but are specified
24、 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
25、 to or revisions of any 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
26、cabulary. EN 526:1994, Gas welding equipment Pressure gauges used for welding, cutting and allied processes. EN 60529:1991, Degrees of protection provided by enclosures. EN 60068-2-6: 1995, Electrical engineering; basic environmental testing procedures Part 2: Tests Test Fc and guidance: Vibration (
27、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 joints are not made on the threads Part 1: Dimensions, tolerances and designation. ISO 1302:1992, Technical dra
28、wings 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 2859-1:1989, Sampling procedures for inspection by attributes Part 1: Sampling plans indexed by acceptable q
29、uality 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 engineers wrenches. 3 Definitions For the purposes of this European Standard the definitions given in EN 472 a
30、pply. 4 Nominal sizes Nominal sizes of gauges are as follows: 50, 63, 80, 100, 150, 160 and 250. See Table 2 for dimensions. 5 Pressure ranges The bar is the preferred unit of pressure, with millibar being used for ranges of 600 mbar or less. a) Pressure ranges in bar 0 to 0,6 0 to 2,5 0 to 10 0t o1
31、 0t o4 0t o1 6 0t o1 , 6 0t o6 0t o2 5 b) Vacuum ranges in bar (Vacuum gauges have anti-clockwise pointer travel with increasing vacuum.) 20,6 to 0 21t o0 c) Combined pressure and vacuum ranges in bar 21 to +0,6 21t o+ 3 2 1t o+9 2 1t o+2 4 2 1 to +1,5 21t o+ 5 2 1 to +15 Ranges in millibars are acc
32、eptable providing the span is in line with 5d). d) Pressure ranges in millibar 0t o1 0t o6 0t o4 0 0t o2 5 0 0 to 1,6 0 to 10 0 to 60 0 to 400 0 to 2,5 0 to 16 0 to 100 0 to 600 0t o4 0t o2 5 0t o1 6 0 e) Vacuum ranges in millibar Vacuum gauges have anti-clockwise pointer travel with increasing vacu
33、um. 21t o0 2 6t o0 2 40 to 0 2250 to 0 21,6 to 0 210 to 0 260 to 0 2400 to 0 22,5 to 0 216 to 0 2100 to 0 2600 to 0 24t o0 2 25 to 0 2160 to 0 The SI-units Pascal (Pa) and Kilopascal (kPa) and Megapascal (MPa) should follow the millibar and bar series from 0 to 100 Pa up to 1000 Pa, then change to 0
34、 to 1,6 kPa up to 1000 kPa then change to 0 to 1,6 MPa and 2,5 MPa.Page 4 EN 837-3:1996 BSI 1998 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 defined: 0,6; 1; 1,6; 2,5 and 4 (see Table 1). F
35、or 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 size compared to the accuracy class Nominal size Accuracy class
36、 0,6 1 1,6 2,5 4 50 333 63 3333 80 3333 100 33333 150 and 16033333 250 333 7 Dimensions 7.1 General tolerances General tolerances: EN 22768-1. 7.2 Cases and flanges The user will have to determine the dimensions for panel cut-out according to the manufacturers data.Page 5 EN 837-3:1996 BSI 1998 d 1
37、Outside diameter of case d 4 Diameter of fixing holes d 2 Outside diameter of flange d 5 Flange diameter (at manufacturers discretion) d 3 Diameter of fixing hole circle Figure 1Page 6 EN 837-3:1996 BSI 1998 Table 2 Dimensions Dimensions in millimetres Nominal size d 1 d 2 d 3 d 4 min. max. 50 48 71
38、 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 accepted to ensure interchangeability with standards. NOTE Minimum height h of flats shall be compatible with use of standard spanners according to ISO 10102.
39、 Figure 2 7.3 Pressure connection The positions of the connections can be selected from Table 8 “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 threads G 1/8 B 1/8-27 NPT EXT G 1/4 B 1/4-18 NPT EXT
40、G 3/8 B G 1/2 B 1/2-14 NPT EXT NOTE G 3/8 B is not preferred. 7.3.1 Screw threads Parallel pipe threads (G) according to ISO 228-1. Taper pipe threads (NPT) according to ANSI/ASME B1.20.1. Other threads specific to certain industries are acceptable. 7.3.2 Shanks with parallel pipe threadsPage 7 EN 8
41、37-3:1996 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 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 ste
42、el 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 length of threading must be equal to l 1 . NOTE 4 For interchangeability with previous standards the spigot of G 1/4 B can be manufac
43、tured with diameter 4 mm. NOTE 5 On diaphragm gauges, spigot may be omitted to allow maximum permissible bore. 1) According to ISO 1302. 7.3.3 Shanks with taper pipe threads Figure 3 Table 5 Dimensions of taper threaded shanks Dimensions in millimetres Thread size l 1 w d 1 min. min. 1/8-27 NPT EXT
44、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 spanners according to ISO 10102. 7.3.4 Parallel threaded tapped holes Figure 4 Table 6 Dimensions of parallel threaded tapped holes Dimensions in millimetres Thread size d 2 t 1 t 2 d 1 20,5 0 min.
45、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 15Page 8 EN 837-3:1996 BSI 1998 7.3.5 Sealing washers For use with parallel screw threads only. NOTE The choice of the sealing washer material depends on the pressure and the fluid to be measured. Figure 5 Table 7 Dimensions of sealing wash
46、ers 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 7.4 Types of mounting and connection position for screwed connection The different mounting types of gauges shall
47、be as given in Table 8. When mounting, ensure that there is enough free space for the blow-out device, if any.Page 9 EN 837-3:1996 BSI 1998 Table 8 Types of mounting and connection position Radial connection 10 11 12 13 14 Type not preferred 20 21 22 23 Centre back connection Type not preferred 30 3
48、1 32 33 Offset back connection Type not preferred Direct mounting Surface mounting Flush mounting Three hole fixing Clamp fixing NOTE Attention is drawn to annex B for examples of flanged and special connections.Page 10 EN 837-3:1996 BSI 1998 8 Wetted parts The purchaser shall indicate to the manufa
49、cturer all information concerning the materials which are compatible with the fluid in relation to the specific conditions of measurement. 9 Requirements The test methods for these requirements are given in clause 10. 9.1 Accuracy The total errors of indication at reference temperature 20 C of the gauge shall not exceed the values given in Table 9. Installation of the pressure gauges shall not cause any change of readings. Table 9 shows the limits of permissib
