1、BRITISH STANDARDBS EN 50446:2006Straight thermocouple assembly with metal or ceramic protection tube and accessoriesThe European Standard EN 50446:2006 has the status of a British StandardICS 17.200.20g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g4
2、0g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 50446:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2006 BSI 2006ISBN 0 580 49631 7National forewordThis British Stan
3、dard was published by BSI. It is the UK implementation of EN 50446:2006. It supersedes BS EN 50112:1996 and BS EN 50113:1996, which are withdrawn.The UK participation in its preparation was entrusted by Technical Committee GEL/65, Measurement and control, to Subcommittee GEL/65/2, Elements of system
4、s. A list of organizations represented on GEL/65/2 can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from leg
5、al obligations.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARD EN 50446 NORME EUROPENNE EUROPISCHE NORM October 2006 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Nor
6、mung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50446:2006 E ICS 17.200.20 Supersedes EN 50112:1994 and EN 50113:1994English version Straight thermocouple assemb
7、ly with metal or ceramic protection tube and accessories Thermomtres thermocouple droits avec tube de protection mtallique ou en cramique, et accessoires Gerade Thermoelemente mit Metall- oder Keramik-Schutzrohr und Zubehr This European Standard was approved by CENELEC on 2006-09-01. CENELEC members
8、 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 concerning such national standards may be obtained on application
9、to the Central Secretariat or to any CENELEC 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 CENELEC member into its own language and notified to the Central Secretariat has
10、the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway,
11、 Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 50446:2006 - 2 - Foreword This European Standard was prepared by the CENELEC BTWG 109-2, Straight thermocouple thermometers. The text of the draft was submitted to the formal vote and was approved b
12、y CENELEC as EN 50446 on 2006-09-01. This European Standard supersedes EN 50112:1994 and EN 50113:1994. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2007-09-01 latest date
13、by which the national standards conflicting with the EN have to be withdrawn (dow) 2009-09-01 _ - 3 - EN 50446:2006 Contents Page 1 Scope.4 2 Normative references.4 3 Thermocouples, dimensions and description.4 4 Straight thermocouples with metal protection tube.5 5 Straight thermocouples with ceram
14、ic protection tube.6 6 Metal protection tubes, dimensions and description.8 7 Ceramic protection tubes, dimensions and description9 8 Lock rings .10 9 Connection heads 11 10 Stop flanges and counter flanges.12 11 Threaded bushings 13 Annex A (informative) Remarks on the selection and operation of pr
15、otection tubes14 Figure 1 Metal protection tubes form A and C.8 Figure 2 Ceramic protection tube 9 Figure 3 Lock ring10 Figure 4 Illustration of connection heads.11 Figure 5 Illustration of stop flanges and counter flanges .12 Figure 6 Illustration of a threaded bushing 13 Figure A.1 Illustration of
16、 a counter flange17 Figure A.2 Mounting of the stop flange on a weld-on thread plate. Thermocouples forms AM / AMK / BM / BMK. Preferred type of mounting for metal surfaces .17 Figure A.3 Mounting of the stop flange on a weld-on thread plate. Thermocouple forms AK / AKK / BK / BKK. Preferred type of
17、 mounting for meta surfaces .17 Figure A.4 Mounting of the stop flange on a thread plate welded to the process pipe. Preferred type of mounting for non-metal surfaces. Suitable for all thermocouple forms 17 Figure A.5 Mounting of the stop flange on a counter flange welded to the process pipe. Prefer
18、red type of mounting for non-metal surfaces, gas-tight mounting is possible. Suitable for all thermocouple forms17 Table 1 Types and dimensions, metal protection tube5 Table 2 Types and dimensions, ceramic protection tube 6 Table 3 Ident letters for metal protection tubes .7 Table 4 Ident letters fo
19、r ceramic protection tubes .7 Table 5 Ident letters for thermocouples.7 Table 6 Dimensions and permitted deviations for metal protection tubes.8 Table 7 Dimensions and additional data for ceramic protection tubes9 Table 8 Dimensions of lock rings.10 Table 9 Dimensions of connection heads11 Table 10
20、Dimensions of stop flanges and counter flanges12 Table 11 Data of threaded bushings .13 Table A.1 Resistance of metal protection tubes when in contact with gases14 Table A.2 Materials for operation in gases 14 Table A.3 Materials for operation in melting plants .15 Table A.4 Operating conditions and
21、 materials.15 Table A.5 Materials for special applications 16 EN 50446:2006 - 4 - 1 Scope This standard applies to straight thermocouples for the nominal pressure level PN 1, which are made of standardized components (connection head, protection tube and thermocouple(s). Details regarding the operat
22、ional areas of the thermocouples and the use of protection tubes are part of this standard. Connection heads as well as stop flanges and threaded bushings for the mounting of the thermocouples are also part of this standard. Special designs are to be agreed upon between manufacturer and user. 2 Norm
23、ative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 50113 Measurement, control, r
24、egulation - Electrical temperature sensors Isolating tubes for thermocouples EN 60529 Degrees of protection provided by enclosures (IP code) (IEC 60529) EN 60584-1 Thermocouples - Part 1: Reference tables (IEC 60584-1) EN 60672-1 Ceramic and glass insulating materials - Part 1: Definitions and class
25、ification (IEC 60672-1) EN 22768-1 General tolerances - Part 1: Tolerances for linear and angular dimensions without individual tolerance indications (ISO 2768-1) ISO 2944 Fluid power systems and components - Nominal pressures 3 Thermocouples, dimensions and description All dimensions in this standa
26、rd are given in mm. If not stated differently the general tolerances according to EN 22768-1 apply. The thermocouples do not have to conform to the illustration, only the indicated dimensions must be adhered to. Thermocouple EN 50446 - AKK 24 t y - 1 S 1 - 050-1000 Description EN main number Type Di
27、ameter F of the outer protection tube Ident letter for the outer protection tube material Ident letter for the inner protection tube material No. of thermocouples Ident letter for the thermocouple material Permitted deviation of the thermo-EMF (class) Diameter of the thermocouple Nominal length NL o
28、f the thermocouple - 5 - EN 50446:2006 4 Straight thermocouples with metal protection tube Table 1 Types and dimensions, metal protection tube Type AM Type AMK Type BM Type BMK Code for straight thermocouples AM AMK BM BMK Connection head Form A B 22 x 2 15 x 2 24 x 3 Metal outer protection tubes 26
29、 x 4 C 610 15(16) x 2 10 x 1,5 Protection tube F x s aCeramic inner protection tubes C 799 15 x 2,5 10 x 2 Ident letter Diam. E, J, K, N *)3,0 1 TC 2 TC 1 TC 2 TC E, J, K, N *)2,5 1 TC 2 TC 1 TC 2 TC E, J, K, N *)1,38 1 TC 2 TC 1 TC 2 TC 1 TC 2 TC 1 TC 2 TCE, J, K, N *)1,0 1 TC 2 TC 1 TC 2 TC 1 TC 2
30、 TC 1 TC 2 TC*)Thermocouple(s) preferably form A or B acc. to EN 50113. R, S, B *)0,5; 0,35 1 TC 2 TC 1 TC 2 TC1 TC=1 thermocouple 2 TC=2 thermocouples Thermocouple acc. to EN 60584-1 Capillary tubes acc. to EN 50113 *)Thermocouple(s) preferably form C or D acc. to EN 50113. 355 500 500 710 710 1 00
31、0 1 000 1 400 1 400 Nominal length NL NOTE Depending on diameter, nominal length and design an additional support must be provided by the user in the case of horizontal mounting.2 000 b as = wall thickness of the protection tube. b This nominal length with built-in precious-metal thermocouple is not
32、 suitable for vertical mounting. Connection head Form A Connection head Form B Outer protection tube metal Outer protection tube metal Inner protection tube ceramic Inner protection tube ceramic Nominal lengthNLCapillary tube and thermocouple(s) Capillary tube and thermocouple(s) F FEN 50446:2006 -
33、6 - 5 Straight thermocouples with ceramic protection tube Table 2 Types and dimensions, ceramic protection tube Type AK Type AKK Type BK Type BKK Code for straight thermocouples AK AKK BK BKK Connection head Form A B Mounting tube, type of steel at the discretion of the manufacturer F4x s / L432 x 2
34、 / 200 22 x 2 / 150 15 x 2 / 80 C 530 26 x 4 C 610 24 x 2,5 15(16) x 2 10 x 1,5 Ceramic outer protection tubes C 799 24 x 3 15 x 2,5 f10 x 2 fC 610 15(16) x 2 10 x 1,5 Protection tube F x s aCeramic inner protection tubes Types AKK and BKK onlyC 799 15 x 2,5 10 x 2 6 x 1 Ident letter Diam. K, N *)3,
35、0 1 TC 2TC d1TC d2TC d K, N *)2,5 1 TC 2 TC 1 TC 2TC e K, N *)1,38 1 TC 2 TC 1 TC 2 TC 1 TC 2 TC K, N *)1,0 1 TC 2 TC 1 TC 2 TC 1 TC 2 TC *)Thermocouple(s) preferably form A or B acc. to EN 50113. R, S, B *)0,5; 0,35 g g1 TC 2 TC g g1 TC 2TC c1 TC=1 thermocouple 2 TC=2 thermocouples Thermocouple acc
36、. to EN 60584-1 Capillary tubes acc. to EN 50113 *)Thermocouple(s) preferably form C or D acc. to EN 50113. 355 500 500 710 710 1 000 1 000 1 400 Nominal length NL NOTE Depending on diameter, nominal length and design an additional support is to be provided by the user in the case of horizontal moun
37、ting. 2 000 b as = wall thickness of the support resp. the protection tube. bThis nominal length with built-in precious-metal thermocouple is not suitable for vertical mounting. cOnly thermocouples with 0,35 mm diam. can be installed. dThermocouple(s) cannot be installed in ceramic protection tubes
38、15(16) x 2 and 15 x 2,5. eThermocouples cannot be installed in ceramic inner protection tubes 10 x 2. fCeramic inner protection tube is not possible. gDesign without inner protection tube is not recommended. Connection head Form A Connection head Form B Outer protection tube ceramic Outer protection
39、 tube ceramic Steel mounting tube Steelmounting tube Inner protection tube ceramic Inner protection tube ceramicCapillary tube and thermocouple(s) Capillary tube and thermocouple(s) F F F4 F4 L4Nominal lengthNL- 7 - EN 50446:2006 Table 3 Ident letters for metal protection tubes 1)Ident. letter Brief
40、 description Material No. H St 35.8 1.0305 D X 10 CrAl 24 1.4762 Q X 15 CrNiSi 2520 1.4841 F X 18 Cr Ni 28 1.4749 U X 10 NiCrAlTi 3220 a1.4876 a Detailed material specifications as well as the available diameters and lengths are to be agreed upon between manufacturer and user. Table 4 Ident letters
41、for ceramic protection tubes Ident. letter Material T C 530 U C 610 Y C 799 X SiC re-crystallized, porous a, bZ SiC reaction-bonded, gas-tight a, ba Detailed material specifications as well as the available diameters and lengths are to be agreed upon between manufacturer and user. bFor deviating dim
42、ensions see Table 6 and footnotes. Table 5 Ident letters for thermocouples Ident. letter Thermocouple EN 60584-1 E NiCr CuNi J Fe CuNi K NiCr Ni N NiCrSi NiSi S Pt 10 % Rh Pt R Pt 13 % Rh Pt B Pt 30 % Rh Pt 6 % Rh 1)Coatings on metal protection tubes are to be agreed upon between manufacturer and us
43、er. EN 50446:2006 - 8 - 6 Metal protection tubes, dimensions and description Form A Form C Protection tube, round bottom Protection tube, weld-in bottom Figure 1 Metal protection tubes form A and C EXAMPLE: Protection tube - A 22 x 1 020 1.4841 or Q: The example gives a description of a metal protec
44、tion tube Form A with diameter F = 22 mm and protection tube length L = 1 020 mm, made from material no. 1.4841 (Ident letter Q acc. to Table 3). Table 6 Dimensions and permitted deviations for metal protection tubes Diameter Wall For straight thermocouples with nominal length NL Form thickness 355
45、500 710 1 000 1 400 2 000 s 0,1 Protection tube length L Permitted deviation +3/-0Protection tube length L Permitted deviation +5/-0 15 2 370 515 725 1 015 1 415 - 22 2 - 520 730 1 020 1 420 2 020 24 3 - 520 730 1 020 1 420 2 020 A / C 26 4 - 520 730 1 020 1 420 2 020 Protection tubes forms A and C
46、are technically equivalent. Coatings on metal protection tubes are to be agreed upon between manufacturer and user; please observe the changing diameters in this case. F s n/= 1.3 s L L +0,2 -0,1 F - 9 - EN 50446:2006 7 Ceramic protection tubes, dimensions and description Figure 2 Ceramic protection
47、 tube EXAMPLE: Protection tube 15 x 1030 C 799: The example gives a description of a ceramic protection tube with diameter F = 15 mm and protection tube length L = 1030 mm, made of ceramic insulating material C 799. EN 60672-1 applies regarding further details on design, demands and tests. Table 7 D
48、imensions and additional data for ceramic protection tubes For straight thermocouples types AK, AKK, BK and BKK Nominal length NL 355 500 710 1 000 1 400 2 000 Protection tube length L F as min. Permitted deviation +/ -3 +/ -5 Protection tube material Tempe-rature shock resistance Tightness cPermitt
49、ed permanent tempe-rature C b10 1,5 375 520 730 1 020 medium 15/16 2 530 740 1 030 1 430 C 610 to gas-tight1 500 24 2,5 530 740 1 030 1 430 2 030 good 10 2 375 520 730 1 020 15/16 2,5 530 740 1 030 1 430 C 799 medium gas-tight1 600 24 3 530 740 1 030 1 430 2 030 26 4 740 1 030 1 430 2 030 C 530 very good porous 1 500 20 e5 530 74
