1、STD.BS1 BS EN 37-3-ENGL 1978 = 1b24bb7 07L22bL BRITISH STANDARD Pressure gauges Part 3: Diaphragm and capsule pressure gauges - Dimensions, metrology, requirements and testing * x m The European Standar EN 83731996 has the status of a British Standard ICs 17.100 NO COPYING WITHOUT BSI PERMISSION EXC
2、EPT AS PERMITTED BY COPYRIGHT LAW 22T BS EN 837-3:1998 STD-BSI BS EN 837-3-ENGL 1998 m Lb24669 0732262 Lbb m BS EN 8373:1998 “his British Standard, having been prepared under the direction of the Elemotechnicai Sector Board, was published under the authority of the Standards Board and comes into eff
3、ect on 15 July 1998 National foreword This British Standard is the English language version of EN 83731996 published by the European Committee for Standadhation (CEN). It includes the corrections issued on 1997-02-20. The UK participation in its preparation was entrusted by Technical Committee GEU65
4、, Measurment and control, to Subcommittee GEiJ6512, Elements of systems, which has the responsibility to: - aid enquirem to understand the text; - present to the responsible European commitke any enquiries on the - monitor related international and European developments and promulgate interpretation
5、, or proposals for change, and keep the UK interests informed; themintheUK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement intedonai or European publications referred to in this document may
6、 be found in the BSI Standards Catalogue under the section eptitied “intemonal Standards Correspondence Index“, or by using the “Fnd facility of the BSI Standards Electxonic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standar
7、ds are responsible for their correct application. 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. Amen
8、dments issued since publication I Te*affeded Amd. No. Date O BSI 1998 ISBN O 580 2M5 1 STD-BSI BS EN 837-3-ENGL 1998 M 1624669 0732263 OT2 M EUROPEAN STANDARD NORME EUR0PEE”E EuRopAIIscHE NORM EN 8373 December 1996 ICs 17.100 Descriptors: Metrology, measuring instsuments, pressure measurements, mano
9、meters, indicating instnunents, dimensions, fidelity, measuring scales, specifications, metrological inspection, tests, packing, designation Engush version - gauges - Part3Dmphmgmandcapsulepressuregauges- Dimensions7 metrology, requirements and testmg Manomlres - Druckmegerate - Partie 3 Manomtres m
10、embrane et manomtres Teil 3: Druckmege - EN 037-2, %wure gauges - Part2: Selection and installation recommendations frpwsure gawf3 - EN 8373, Pressure gauges - Part 3: Diaphmgrn and capsule pressure gauges - l?hmshs, w-gy, mpinmkmts and testing. According to the CENICENELEC Internai Regulations, the
11、 national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, ireland, It basic environmental testing procedures - Part 2: Tests - Test Fc and guidance: Vibration (sinu
12、soidal). environmental testing procedures - Part 2: Tests - Test Ea and guidance: Shock. IS0 2281:1994, Pipe threads where pressure-tight joints are not made on ULe threads - Part 1: Dimensions, tlerances and designation. IS0 13021992, Technical drawings - Methods of indicating su?jxe texture on dra
13、wings. Part 1: Tolerames for linear and angular dimensions without indivi.dual tolemnce indications. IS0 2859-1: 1989, Sampling pceures for inspectwn by attributes - Part i: Sampling plans i basic EN 22768-1:19!33, Gd tolemnces - Page 3 EN 8373.1996 IS0 7000: 1989, Motor vehicles; Graphic symbols -
14、Principles, synopsis. IS0 101021990, Assembly tools for scrms and nuts - Double-headed opmen 1,s; 2,5 and 4 (see %ble 1). For gauges with a pointer stop, the accuracy class will cover 10 to 100 % of the range. For gauges wih a free zero, the accuracy class wili cover O to 100 % of the range and zero
15、 shall be used as an accuracy check point 50 63 80 100 160and160 250 lhble 1 - Nominal size compared to the accuracy class X X X X X X X X X X X X X X X X X X X 7 Dimensions 7.1 General tolerances General tolerances: EN 227681. 7.2 Cases and flanges The user will have to determine the dimensions for
16、 panel cut-out according to the manufacturers data O BSI 1998 - _ _ STDmBSI BS EN 837-3-ENGL It998 It624669 0732267 748 D Page 6 EN 8373:1996 Outside diameter of case Outside diameter of flange Diameter of fmng hole circle Figure 1 Threaded pressure connection c- Optional surface mounting brackets D
17、iameter of xing holes Flange diameter (at manufacturers discretion) O BSI 1998 STD=BSI BS EN 837-3-ENGL 1998 m Lb24bh 0732268 la84 m Parallel pipe threads Gi/B G 1/4B Page 6 EN 8373:1996 aper pipe threads W27 Ni“ EXT 1/4-18 NPT EXT nble 2 - Dimensions Dimensions in millimetres GUZB 7.3 Pressure conn
18、ection The positions of the connections can be selected from ?)able 8 “Qpes of mounting and connection position“. For thread forms and sizes, see Wle 3. l/2-14 NPT EX“ G3B I I 7.3. Screw threads Parallel pipe threads (G) according to IS0 2281. ILiper pipe threads (NI“) according to ANSVASME B1.20.1.
19、 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 accoring to IS0 10102. Figure 2 - O BSI 1998 STD-BSI BS EN 837-3-ENGL 1778 Lb24bb9 07122b7 510 Thread size d, Page 7
20、EN 8373.1996 4 d3 d4 1, 12 13 f W min. +0,5 +0,5 min. O O G 1/4 B G3#B GlRB 5 975 995 13 2 2 2 10 575 13 13 16 3 3 2 13 6 17,5 17,5 20 3 3 3 17 NOTE 1 For stainless steel screwed connection, f dimensions can be raised up to 50 %. NOTE 2 G 118 B may be made without spigot. NOTE 3 G 1/8 B may be made
21、without groove f. In this case the length of threading must be equal to 1,. NOTE 4 For interchangeability with previous standards the spigot of G 114 B can be manufactured with diameter 4 mm. NOTE 5 On diaphragm gauges, spigot may be omitted to allow maximum permissible bore. Thread size d, 7.3.3 Sh
22、anks with taper pipe threads 1, W min. min. (hexagon, square or flats) l#27NPTEXT 1/4-18NFTEX 1/2-14NPTEXT Figure 3 I 10 13 18 G 3/8 G 112 675 16 12 7 19 15 8 10 17 NOTE Height of flats h shall be compatible with use of sDamers accordina to IS0 10102. I 7.3.4 Parallel threaded tapped holes I -1 Figu
23、re 4 Table 6 - Dimensions of parallel threaded tapped holes Dimensions in millimetres Thread size dz 4 tz d, I I 0.5 I min. I G 1/8 1495 110 I 775 I G if4 I 575 I 13 I 10 I 1 According to IS0 1302. O BSI 1998 STDmBSI BS EN 837-3-ENGL 1998 W 3b24bb7 O732270 232 Threadsize I d, Page 8 EN 8373:1996 d3
24、I e *0,2 7.3.6 Sealing washers For use with parallel screw threads om. NOTE The choice of the sealing washer material depends on the pressure and the fluid to be measured. 0 -0,2 G 1/4B 5,2 +:2 I 995 I d3 I 1,5 Figure 6 (GMB +O2 I 8 O +0,3 I 13 O -0.3 O l2 +0,4 I 17,5 O -0.5 O l2 7.4 f 0, x (Q - ti)
25、 % of the span for diaphragm gauges; where: tl is the reference temperature in degrees Celsius; t:, is the ambient temperature in degrees Celsius. 9.4 Endurance Gauges shaii withstand the steady pressure, over-presmires and cyclic pressures as described below without exceeding the specified change o
26、f accuracy (see 10.4.3). For gauges with combined pressure and vacuum ranges the endurance test required may be met with gauges of positive range only with same span. EXAMPLE: A gauge with a range of -1 bar to +5 bar may be substituted by a gauge with range of O bar to 6 bar. 9.4.1 Gauges suitable f
27、or maximum steady working pressure 75 % of the maximum scale value 9.4.1.1 swy pressure The gauge shall withstand a steady pressure equal to the maximum scale value for an extended period. 9.4.1.2 OVW-WSSUW The gauge shall withstand a 25 % over-pressure for a short period. 9.4.1.3 cyclic pressure Th
28、e gauge shall withstand a pressure varying from 30 % to 60 % of the maximum scale value for 100 o00 cycles. 9.4.2 Gauges suale for maximum steady working pressure equal to the maximum scale value 9.4.2.1 Steady pressure and over-pressure The gauge shall withstand a steady pressure of 1,3 times the m
29、aximum scale value for an extended period 9.4.2.2 Cyclic pressure The gauge shall withstand a pressure fluctuating between 30 94 and 95 % of the maximum de value for 100 O00 cycles. 15 O00 cycles am sufficient for gauges of class 0,6. 9.6 Operating conditions 9.5.1 Rated temperatures in service Ambi
30、ent temperatwe and temperature of the fluid under pressure: Mm -20 “C to +60 “C. Minimum and maximum temperature in service for iquid-lled gauges shall be in accordance with iquid properties. 9.6.2 Rated storage temperature Storage temperature: hm -40 “C to +70 “C. The gauge shall not change its app
31、earance. The dial and pointer shai not crack, blister or change their colour. 9.6.3 Protection against ingress of water an foreign particles (Degree of protection) Recommended minimum protection ratings in accordance with EN 0529 - for indoor use IP 31; - for outdoor use IP 44. 9.6.4 wect of mechani
32、cal shock No change of indication after application of a shock load of 150 ds2. Shock test is required for gauges of accuracy classeslto4only. O BSI 1998 STD.BSI ES EN 837-3-ENGL 1998 1624669 0732273 T43 Scale Nominai size Minimum number of minor scale divisions Accuracy classes 80 100 150and160 250
33、 50 63 - 100 100 100 - - 80 100 150and160 250 50 63 80 100 150and160 250 - 80 80 80 - - - 125 125 125 80 100 150and160 250 50 63 - 80 80 80 - - Page 11 EN 8373.1996 9.6.6 mect of mechanical vibration The gauge shall be subjected to vibrations on three orthogonal axes in the following conditions: - a
34、cceleration 5 ds2; - 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. Vibration test is required for gauges of acuraq classes 1 to 4 only 9.5.6 Leak rate The le
35、ak rate shall not exceed 5 X 5 X mbmYs for dmphragm pressure gauges, rnbar.Ys for capsule pressure gauges. 9.5.7 Mounting position A variation of the nominal mounting position of “5“ shall not give a change of indication of more than 0,5 times the class. 9.6 Dials and pointers 9.6.1 Scale angle The
36、scale normaly covers 270“ of arc. 9.6.2 Scale interval The scaie interval shall be of value that represents 1 X lon, 2 X 10% or 5 X 10% of the pressure unit where n is an integer number which can be positive, negative or zero. The minimum number of minor scaie divisions for each class of accuracy an
37、d size of gauge are as shown in Table 10. For iilustmtive examples see annexk 1 4 - oto100 50 163 l- - 20 20 20 20 20 20 20 50 50 50 50 50 50 50 50 50 50 50 - 50 50 50 - - 32 32 32 32 32 32 32 oto 160 32 32 32 32 32 32 32 32 25 25 50 50 50 50 32 50 50 25 25 50 50 50 - - 32 50 50 - 25 25 50 50 50 - 2
38、5 50 50 50 50 O to 250 50 I- - 20 20 20 20 20 20 20 I 63 I- o to400 40 40 40 40 40 40 40 40 40 40 40 - 40 40 40 - - 30 30 30 30 30 30 30 O to 600 1i!and160 1; 250 60 60 60 60 60 60 60 60 60 60 60 - 60 60 60 - O BSI 1998 STDmESI ES EN 837-3-ENGL 3998 = Lb24bb9 0732274 988 m Gauge nominal size 50 63 8
39、0 100 150 160 250 Page 12 EN 8373:lM Minimum length of pointer 18 23 28 36 67 62 95 9.6.3 Scae marks 9.6.3.1 The thickness of the scale marks shail not exceed fi of the scale spacing. Examples are shown in annexk 9.6.3.2 The scale spacing shall not be der tbIl1ItUl-l. 9.6.3.3 The scale spacing shall
40、 be as constant as possible. The Merence between the longest and shortest spacing shall not exceed fi of the latter. 9.6.4 Scale numbering Scale numbering will be at manufacturers discretion. Examples of scale numbering are shown in annexA for accuracy classes from 0,6 to 4. 9.6.6 Pointer imensions
41、The tip of the pointer that sweeps the de mark shall be no wider than the minor scale mark The pointer shall cover between Y10 to 9/10 of the length of the shortest lines of the minor scale marks. The minimum lengths of pointer from axis to the tip are shown in Table 11. 9.6.6 Ivormaton on ul a) Uni
42、t of pressure shall be marked b) Accuracy class shall be marked preferably at the end of the scale. c) The symbol for the type of pressure element may be marked, see lble 12. d) Gauges suitable for maximum steady working pressure equal to the maximum scale value shaii have an identifying mark at the
43、 maximm scale due (see Figure 6). e) The symbol for the diai piane SM be marked when the manufacturer is required to calibrate the gauges other than in the vertical position (= Figwe n. f) if the customer requires the gauge to be calibrated at other than reference temperature this shall be marked Th
44、is applies to 0,6 class gauges. g) EN number of this standard may be marked. h) Name or logo of the manufacturer andor supplier shall be marked. i) Serial numbers shall be marked on ail gauges which are subject to state metrologid controL Serial numbers may be marked on the other gauges. j) Where th
45、e gauge has wetted parts, different from brass, bronze, tin or hard solder, then the material of the wetted parts may be marked. Table 12 - Symbols for types of pressure elements I Element type I Symbol I l- Identifying mark Figure 6 O BSI 1998 STDmBSI BS EN 837-3-ENGL 1998 D Lb24669 0732275 834 * *
46、 m Page 13 EN 8373:1996 Dial Figure 7 9.6.7 Pointer stop Gauges with maximum steady working pressure equal to the maximum scale value shall have a free zero. Gauges with maximum steady working pressure 75 % of the maximum scale value may have a free zero. 9.7 Safety Safety gauges shall prom an opera
47、tor from faiiure of the pressureresponsive element and the release of high pressure gases into the case by deflecting the blast and debris away from the front of the gauge. 9.7.1 Blow-out device gauges When a blow-out device is fitted to a pressure gauge (designated by S1, see clause 12) it shall be
48、 resistant to blocking by debris and dirt and shall operate at a pressure of not more than half of the window-burst pressure. Where the gauge is sealed for the purpose of liquid filling a blow-out device shall be fitted These gauges shall have no special marking. 9.8 Liquid-filled gauges Liquid-fill
49、ed gauges shall have an appropriate device in order to assure atmospheric compensation. 9.9 Additional constructional requirements for gauges subject to Legal Metrology Control For applications in Legal Metsology the appropriate OIML recommendations and the national legislation as well as the requirements below are to be observed. 9.9.1 The pressureresponsive element, the movement, the pointer, and the dial shall be instaled inside an enclosing case, which can be sealed by a securing se
