HD 446.1 S1:1984

Thermocouples - Part 1: Reference tables HD 446.1 S1:1984

Scope

This standard provides thermocouple reference tables for use in converting thermocouple voltages into their equivalent measured temperatures and vice versa - The polynominal equations from which the tables are derived have been included in the Appendix hence no tolerances are given - Any error obtained by using these equations directly will be less than one in the last place - This standard is based upon the International Practical Temperature Scale of 1968 (IPTS-68) - Temperatures are expressed in degrees Celsius (Symbol t68) - The tables which it contains are derived from experimental work carried out by the National Research Council (Canada), the National Physical Laboratory (U.K.) and the National Bureau of Standards (U.S.A.) and are not dependent upon any particular values of the secondary reference points included with IPTS-68 - However, if it is desired to calibrate a thermocouple using some of these secondary reference points, then the temperatures assigned to them in the edition of IPTS-68 current at the time the calibration is being carried out should be used