Thermocouples -- Extension and compensating cables. Tolerances and identification system
IEC 60584-3:2021 addresses the necessity for precise measurement of the electro-motive force (e.m.f.) in thermocouple temperature measurement. It is essential that the e.m.f. of the thermocouple circuit be accurately measured by a measuring instrument.
A thermocouple is electrically connected to the instrument by a proper pair of electric cables. The IEC 60584-3:2021 standardizes these cables.
The standard specifies identification and manufacturing tolerances for extension and compensating cables (excluding mineral insulated extension and compensating cables) provided directly to users of industrial processes.
These tolerances are determined with respect to the e.m.f. versus temperature relationship of IEC 60584-1.
Furthermore, IEC 60584-3:2021 specifies the requirements for extension and compensating cables intended for use in industrial process control.
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