This standard applies to the manufacture of nickel-chromium-gold-iron and copper-gold-iron low-temperature thermocouple wires (hereinafter referred to as wires).
GB/T 2904-1982 history
2010GB/T 2904-2010 Nickel-Chromium/Gold-Iron,Copper/Gold-Iron low temperature thermocouple wires
1982GB/T 2904-1982 Nickel-Chromium/Gold-Iron,Copper/Gold-Iron low temperature thermocouple wires and their reference tables