IEC 61515 pdf download.Mineral insulated metal-sheathed thermocouple cables and thermocouples
1 Scope
This International Standard establishes the requirements for simplex, duplex and triplex mineral-insulated metal-sheathed thermocouple cables and thermocouples, which are intended for use in general industrial applications. The abbreviation MIMS (for “mineral-insulated metal-sheathed”) will be used hereafter. It covers thermocouple cables and thermocouples with only base-metal conductors of Types T, J, E, K and N. The specifications in this standard apply to new thermocouple cables and thermocouple units as delivered to the user. They do not apply to the product after use. External seals, terminations, connections and other accessories are not within the scope of this International Standard. This standard does not apply to precious metal thermocouple cables and thermocouples. The special requirements for nuclear primary loop applications are dealt with in the other standards.
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60584-1 and the following apply. 3.1 mineral insulated metal-sheathed thermocouple cable bendable cable consisting of one or more pairs of thermocouple conductors encapsulated in a metal protecting sheath, insulated from each other and from the sheath by a compacted mineral material Note 1 to entry: Abbreviation MIMS for “mineral insulated metal-sheathed” is used hereafter. 3.2 MIMS thermocouple thermocouple manufactured from mineral-insulated metal-sheathed thermocouple cable Note 1 to entry: This note applies to the French language only.3.3 simplex thermocouple thermocouple unit comprising one pair of thermocouple conductors 3.4 duplex thermocouple thermocouple unit comprising two pairs of thermocouple conductors 3.5 triplex thermocouple thermocouple unit comprising three pairs of thermocouple conductors 3.6 measuring junction junction of the thermocouple conductors which is subjected to the temperature to be measured 3.7 grounded junction bonded junction earthed junction measuring junction electrically connected to the metal sheath 3.8 insulated junction ungrounded junction measuring junction electrically insulated from the metal sheath 3.9 thermal response time time a thermocouple takes to respond at a specified percentage to a step change in temperature Note 1 to entry: The time to register 50 % of the step change, for example, is written τ 0,5 . Note 2 to entry: The test medium and its flow conditions shall be specified (usually flowing water or flowing air). 3.1 0 type test test conducted on one or more samples of the production to verify that the product is compliant with the requirements of IEC 61 51 5 following the introduction or change of material specification, design or manufacturing process 3.1 1 routine test test to which each individual product is subjected during or after manufacture to ascertain whether it complies with the requirements of IEC 61 51 5 3.1 2 optional test test that is performed upon agreement between a supplier and a user to ensure compliance with the user’s specific application
4 General principles
4.1 A MIMS thermocouple A MIMS thermocouple specified in this standard shall be made of a MIMS thermocouple cable that complies with this standard.4.2 Electromotive force The electromotive force (abbreviated EMF hereafter) versus temperature relationship shall comply with IEC 60584-1 . The EMF tolerance, as specified in IEC 60584-1 , should be agreed between the supplier and the user. 4.3 Materials and their properties 4.3.1 Sheath The sheath material shall be of qualified stainless steel or high nickel alloy or other metals selected by agreement between users and suppliers. It shall be chosen to suit user’s application in order to protect the thermocouple during use. The general surface finish of the sheath upon delivery shall be equal to, or better than, roughness grade ISO 1 302 scale 8 (3,2 µm Ra). 4.3.2 Conductors Conductors shall be those forming thermocouple types T, J, E, K or N as specified in IEC 60584-1 .This standard applies to thermocouple cables and thermocouples that have 1 , 2 and 3 pairs of thermocouple conductors. For duplex and triplex, cables basic adjacent conductor configurations are specified. Alternative configurations are acceptable by the agreement between supplier and user provided that all the other requirements of this standard are met. Some examples of alternative adjacent conductor configurations are given in Annex A. 4.3.3 Insulation materials The mineral insulation shall consist of compacted ceramic powder. The purity of insulating material should be at least 96 % and informative compositions are shown in Annex B. Specific requirements, concerning the purity of the insulation material, can be customized by agreement between the user and the supplier.
IEC 61515 pdf download
