SIST EN 50446:2007

Straight thermocouple assembly with metal or ceramic protection tube and accessories

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 operational 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.

Gerade Thermoelemente mit Metall- oder Keramik-Schutzrohr und Zubehör

Diese Norm gilt für gerade Thermoelemente für die Nenndruckstufe PN 1, die aus genormten Einzelteilen (Anschlusskopf, Schutzrohr und Thermoelement(e)) gebaut werden. Einzelheiten über die Betriebsbereiche der Thermopaare und die Verwendung der Schutzrohre sind in dieser Norm enthalten. Anschlussköpfe sowie Anschlagflansche und Gewindemuffen für die Befestigung der Thermoelemente an der Einbaustelle sind in dieser Norm ebenfalls enthalten. Sonderausführungen sind zwischen Lieferant und Anwender zu vereinbaren.

Thermomètres à thermocouple droits avec tube de protection métallique ou en céramique, et accessoires

Cette norme traite des thermocouples droits pour la pression nominale PN°1 et qui sont constitués de composants normalisés (tête de connexion, tube de protection et thermocouples(s)). Les détails concernant les domaines d’application des thermocouples et l’utilisation des tubes de protection font partie de cette norme. Les têtes de connexion ainsi que les plaques d’arrêt et les traversées filetées pour le montage des thermocouples font également partie de cette norme. Le fournisseur et l’utilisateur devront se mettre d’accord pour les conceptions particulières.

Ravni termočlen s kovinsko ali keramično zaščitno cevjo in priborom

General Information

• Status: Published
• Publication Date: 31-Dec-2006
• Withdrawal Date: 31-Dec-2006
• ICS: 17.200.20 - Temperature-measuring instruments
• Technical Committee: MKP - Industrial-process measurement and control
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Jan-2007
• Due Date: 01-Jan-2007
• Completion Date: 01-Jan-2007
• Ref Project: EN 50446:2006 - Straight thermocouple assembly with metal or ceramic protection tube and accessories

Relations

• Replaces: SIST EN 50113:2001 - Measurement, control, regulation - Electrical temperature sensors - Isolating tubes for thermocouples
• Effective Date: 01-Sep-2009
• Revised: SIST EN 50113:2001 - Measurement, control, regulation - Electrical temperature sensors - Isolating tubes for thermocouples
• Effective Date: 13-May-2010
• Replaces: SIST EN 50112:2001 - Measurement, control, regulation - Electrical temperature sensors - Metal protecting tubes for TC assemblies
• Effective Date: 01-Jan-2007
• Replaces: SIST EN 50112:2001 - Measurement, control, regulation - Electrical temperature sensors - Metal protecting tubes for TC assemblies
• Effective Date: 07-Jun-2022

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 50446:2007
01-januar-2007
1DGRPHãþD
SIST EN 50112:2001
SIST EN 50113:2001
5DYQLWHUPRþOHQVNRYLQVNRDOLNHUDPLþQR]DãþLWQRFHYMRLQSULERURP
Straight thermocouple assembly with metal or ceramic protection tube and accessories
Gerade Thermoelemente mit Metall- oder Keramik-Schutzrohr und Zubehör
Thermomètres à thermocouple droits avec tube de protection métallique ou en
céramique, et accessoires
Ta slovenski standard je istoveten z: EN 50446:2006
ICS:
17.200.20
SIST EN 50446:2007 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

EUROPEAN STANDARD
EN 50446

NORME EUROPÉENNE
October 2006
EUROPÄISCHE NORM

ICS 17.200.20 Supersedes EN 50112:1994 and EN 50113:1994


English version


Straight thermocouple assembly
with metal or ceramic protection tube
and accessories


Thermomètres à thermocouple droits  Gerade Thermoelemente
avec tube de protection métallique mit Metall- oder Keramik-Schutzrohr
ou en céramique, et accessoires und Zubehör





This European Standard was approved by CENELEC on 2006-09-01. CENELEC 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 concerning such national standards may be obtained on
application 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 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, Poland, Portugal, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

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

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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 by 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 by which the national standards conflicting
with the EN have to be withdrawn (dow) 2009-09-01
__________

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- 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 ceramic protection tube.6
6 Metal protection tubes, dimensions and description.8
7 Ceramic protection tubes, dimensions and description.9
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 protection tubes.14
Figure 1 – Metal protection tubes form A and C.8
Figure 2 – Ceramic protection tube .9
Figure 3 – Lock ring.10
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 a counter flange.17
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 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. Preferred
type of mounting for non-metal surfaces, gas-tight mounting is possible. Suitable for all
thermocouple forms.17
Table 1 – Types and dimensions, metal protection tube.5
Table 2 – Types and dimensions, ceramic protection tube .6
Table 3 – Ident letters for metal protection tubes .7
Table 4 – Ident letters for 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 tubes.9
Table 8 – Dimensions of lock rings.10
Table 9 – Dimensions of connection heads.11
Table 10 – Dimensions of stop flanges and counter flanges.12
Table 11 – Data of threaded bushings .13
Table A.1 – Resistance of metal protection tubes when in contact with gases.14
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 materials.15
Table A.5 – Materials for special applications .16

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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 operational 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 Normative 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, regulation - 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 classification (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 standard 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
Diameter 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 of the thermocouple

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- 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

Connection head
Connection head
Form A
Form B
Outer protection tube
metal
Outer protection tube
metal
F
F
Inner protection tube
Inner protection tube
ceramic ceramic
Capillary tube and
Capillary tube and
thermocouple(s)
thermocouple(s)
 Code for straight thermocouples AM AMK BM BMK
 Connection head Form A B
22 x 2 15 x 2
Metal outer protection tubes 24 x 3 –
a
26 x 4 –
Protection tube F x s
C 610 – 15(16) x 2 – 10 x 1,5
Ceramic inner protection
tubes
C 799 – 15 x 2,5 – 10 x 2
Ident letter Diam.
*)
3,0 1 TC 2 TC 1 TC 2 TC – – – –
  E, J, K, N
1 TC=1 thermocouple
*)
2,5 1 TC 2 TC 1 TC 2 TC – – – –
  E, J, K, N
2 TC=2 thermocouples
*)
Thermocouple
1,38 1 TC 2 TC 1 TC 2 TC 1 TC 2 TC 1 TC 2 TC
  E, J, K, N
acc. to EN 60584-1
*)
1,0 1 TC 2 TC 1 TC 2 TC 1 TC 2 TC 1 TC 2 TC
  E, J, K, N
Capillary tubes
acc. to EN 50113
*)
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 TC
**)
Thermocouple(s) preferably form C or D acc. to EN 50113.
– 355
500 500
Nominal length NL
710 710
NOTE  Depending on diameter, nominal length and design an additional
1 000 1 000
support must be provided by the user in the case of horizontal mounting.
1 400 1 400 –
b
– –
2 000
a
 s = wall thickness of the protection tube.
b
This nominal length with built-in precious-metal thermocouple is not suitable for vertical mounting.
Nominal length
NL

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EN 50446:2006 - 6 -
5 Straight thermocouples with ceramic protection tube
Table 2 – Types and dimensions, ceramic protection tube
Type AK  Type AKK  Type BK Type BKK

Connection head
Form A
Connection head
Form B
Steel
mounting tube
L4
Steel
mounting tube F4
F4
Outer protection tube
F
ceramic
Outer protection tube
ceramic
Inner protection tube
Inner protection tube
ceramic
ceramic
F
Capillary tube and
Capillary tube and
thermocouple(s)
thermocouple(s)
 Code for straight thermocouples AK AKK BK BKK
 Connection head Form A B
 Mounting tube, type of steel at the discretion of
F x s / L
32 x 2 / 200 22 x 2 / 150 15 x 2 / 80
4 4
 the manufacturer
C 530 26 x 4 – –
Ceramic outer protection
C 610 24 x 2,5 15(16) x 2
10 x 1,5
tubes
Protection tube
f f
a C 799 24 x 3
15 x 2,5  10 x 2
F x s
Ceramic inner protection
C 610 15(16) x 2 10 x 1,5 – –
tubes
C 799 15 x 2,5 10 x 2 – 6 x 1
Types AKK and BKK only
Ident letter Diam.
d d d
*)
3,0 1 TC – – – –
2TC 1TC 2TC
  K, N
1 TC=1 thermocouple
2 TC=2 thermocouples
e
*)
2,5 1 TC 2 TC 1 TC – – – –
2TC
  K, N
Thermocouple
*)
1,38 1 TC 2 TC 1 TC 2 TC 1 TC 2 TC – –
acc. to EN 60584-1  K, N
*)
1,0 1 TC 2 TC 1 TC 2 TC 1 TC 2 TC – –
Capillary tubes
  K, N
acc. to EN 50113
*)
Thermocouple(s) preferably form A or B acc. to EN 50113.

**) g g g g c

  0,5; 0,35 1 TC 2 TC 1 TC
–  –  –  –  2TC
  R, S, B
**)
Thermocouple(s) preferably form C or D acc. to EN 50113.
– 355
500 500
Nominal length NL
710 710 –
NOTE  Depending on diameter, nominal length and design an
additional support is to be provided by the user in the case of horizontal
1 000 1 000 –
mounting.
1 400 – –
b
– – –
2 000
a
s = wall thickness of the support resp. the protection tube.
b
This nominal length with built-in precious-metal thermocouple is not suitable for vertical mounting.
c
Only thermocouples with 0,35 mm diam. can be installed.
d
Thermocouple(s) cannot be installed in ceramic protection tubes 15(16) x 2 and 15 x 2,5.
e
Thermocouples cannot be installed in ceramic inner protection tubes 10 x 2.
f
Ceramic inner protection tube is not possible.
g
Design without inner protection tube is not recommended.
Nominal length
NL

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- 7 - EN 50446:2006
1)
Table 3 – Ident letters for metal protection tubes
Ident. letter Brief 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
a
U X 10 NiCrAlTi 3220 1.4876
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 for ceramic protection tubes
Ident. letter Material
T C 530
U C 610
Y C 799
a, b
X SiC re-crystallized, porous
a, b
Z SiC reaction-bonded, gas-tight
a
Detailed material specifications as well as the available diameters and lengths are
to be agreed upon between manufacturer and user.
b
For deviating dimensions see Table 6 and footnotes.

Table 5 – Ident letters for therm
...