IEC 62828-3:2018 pdf download

IEC 62828-3:2018 pdf download.Reference conditions and procedures for testing industrial and process measurement transmitters
1 Scope
This part of IEC 62828 establishes specific procedures for testing temperature transmitters used in measuring and control systems for industrial process and for machinery control systems. When the process measurement transmitter features the temperature transmitter separated from the sensing element (RTD, TC, etc.), the standard applies only to the temperature transmitter without the sensing element. In case of device where the sensing element is fully integrated with the temperature transmitter, the standard applies to the complete device. For general test procedures, reference is made to IEC 62828-1 , which is applicable to all types of industrial and process measurement transmitters (PMT). NOTE In the industrial and process applications, to indicate the process measurement transmitters, it is common also to use the terms “industrial transmitters”, or “process transmitters”. The sensing element itself (e.g., RTD, TC, etc.) as well as radiation thermometers are excluded from the scope of this document.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements 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. IEC 60584 (all parts), Thermocouples IEC 62828-1 :201 7, Reference conditions and procedures for testing industrial and process measurement transmitters – Part 1: General procedures for all types of transmitters
3 Terms and definitions
3.1 Definitions regarding temperature For the purposes of this document, the terms and definitions given in IEC 62828-1 and the following apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: • IEC Electropedia: available at http://www.electropedia.org/ • ISO Online browsing platform: available at http://www.iso.org/obp
3.1 .1 cold junction compensation CJC suitable automatic system to compensate the thermocouple EMF to 0 °C 3.1 .2 International Temperature Scale of 1 990 ITS 90 temperature scale adopted by the International Committee on Weights and Measures (CIPM) in 1 989 for the purpose of practical measurements Note 1 to entry: The quantities corresponding to thermodynamic temperature and Celsius temperature defined by this scale are denoted T 90 and t 90 , respectively, where t 90 = T 90 – T 0 with T 0 = 273,1 5 K. Note 2 to entry: The units for T 90 and t 90 are the kelvin, symbol K, and the degree Celsius, symbol °C, respectively. [SOURCE: IEC 60050-1 1 3:201 1 , 1 1 3-04-1 8] 3.1 .3 resistance temperature detector RTD temperature sensor containing a sensing element made of platinum or other metals whose resistance changes with temperature Note 1 to entry: Resistance thermometers are often called RTDs. Note 2 to entry: A platinum resistance thermometer (PRT) is an RTD that has a sensing element made of platinum; other common RTDs are nickel resistance thermometers (NRT) and copper resistance thermometers (CRT), with the sensing element made of nickel or copper respectively. [SOURCE: IEC 62465:201 0, 3.20, modified – The notes have been added.] 3.1 .4 thermocouple TC pair of conductors of dissimilar materials joined at one end and forming part of an arrangement using the thermoelectric effect for temperature measurement Note 1 to entry: The production of an electromotive force (EMF) due to a temperature gradient along a conductor is called thermoelectric effect (or Seebeck effect). [SOURCE: IEC 60584-1 :201 3, 2.3, modified – The abbreviation and notes have been added.]
4 General description of the device
The general description outlined in Clause 4 and Annex A of IEC 62828-1 :201 7 is applicable. In Annex A of this document, some additional information is only given regarding the measuring section of a temperature industrial and process measurement transmitter (temperature PMT).
5 Reference test conditions
To verify the influence of external quantities on accuracy, as well as the mechanical and electrical conditions which a device can withstand and still work within specification, the corresponding clause of IEC 62828-1 applies, both for standard reference test conditions and for operating reference test conditions.