DIN Standards Committee Welding and allied processes
DIN EN 60584-1
Thermocouples - Part 1: EMF specifications and tolerances (IEC 60584-1:2013); German version EN 60584-1:2013
Thermoelemente - Teil 1: Thermospannungen und Grenzabweichungen (IEC 60584-1:2013); Deutsche Fassung EN 60584-1:2013
Overview
This International Standard relates the electromotive force (hereinafter abbreviated as EMF) generated by the designated thermocouple types to temperature, based upon the International Temperature Scale of 1990 (IST-90). The reference polynomials for Types R, S, B, J, T, E, K and N are those used in the previous edition of this standard, IEC 60584-11995. They were originally produced by the National Institute of Standards and Technology (NIST) and published in NIST Monograph 175:1995. The major revision of this new edition of the standard is standardization of two kinds of tungsten-rhenium thermocouple, designated Type C and Type A. Both of them have been used in industry for a long time. Temperature versus EMF relationship for Type C and Type A are those values published in the national standards GOST R 8.585-2001 (Type A) and ASTM E 230-M12 (Type C). This edition merges two parts of the former IEC 60584 series, IEC 60584-1:1995 (Part 1 "Reference tables") and IEC 60584-2:1982 (Part 2 "Tolerances") and supersedes both standards. IEC 60584-3:2007 (Part 3 "Extension and compensating cables - Tolerances and identification system") remains valid. The reference functions are polynomials which express the EMF (electromotive force) as a function of temperature with the thermocouple reference junctions at 0 °Celsius. Values of EMF at intervals of 1 K are tabulated in Annex A. For convenience of calculating temperatures, inverse functions are given in Annex B which express temperature as functions of EMF within stated accuracies. This International Standard specifies the tolerances for thermocouples manufactured in accordance with this standard. The tolerance values are for thermocouples manufactured from wires, normally in the diameter range 0,13 mm to 3,2 mm, as delivered to the user and do not allow for calibration drift during use. Informative Annex C gives guidance on the selection of thermocouples with regard to temperature range and environmental conditions. The responsible committee is DKE/K 961 "Elektrische Messwertaufnehmer und Messgrößenumformer" ("Electrical measurement sensors and transducers") of the DKE (German Commission for Electrical, Electronic and Information Technologies) at DIN and VDE.
