temperature hand book 7 - Tempsens Instruments

7.3 BASE METAL EXTENSION WIRES AND COMPENSATINGCABLES TYPES AND TOLERANCESThermocouple. Wire Types and CodesThermocouple Conductors ± CableTypeCodeE Nickel Chromium / Constantan (Nickel EXChromium / Copper-Nickel, Chrome /Constantan, T1 / Advance, Ni Cr /Constantan)J Iron* / Constantan Iron / Copper-Nickel, Fe / JXKonst, Iron /Advance, Fe /Constantan, I/C)K Nickel Chromium / Nickel Aluminium* KX(NC/NA, Chromel / Alumel, C/A, T1/T2 NiCr / Ni, Ni Cr / Ni Al)N Nicrosil / Nisil NXNCT Copper / Constantan (Copper / Copper-Nickel, TXCu / Con, Copper / Advance)Vx Copper / Constantan (Low Nickel) Cu / KCBConstantan) Compensating for “K”(Cu / Constantan)U Copper /Copper Nickel, Compensating For RCAPlatinum 10% or 13% Rhodium / Platinum SCA(Codes S and R respectively) Copper /Cupronic, Cu / Cu Ni, Copper / No. 11 Alloy)• Magnetic () Alternative & Trade NamesIdentification as to whether a thermocouple cable type is extension orcompensating is indicated in the example which follows; however, please notethat a letter A or B after the C for Compensating refers to the CableTemperature Range in accordance with the table of Tolerance Values set out inthis standard.K X 1 = K EXTENSION CLASS 1K CA 2 = K COMPENSATION CLASS 2 0 to 150° 7.4 THERMOCOUPLE WIRE TOLERANCESThe figure shown in the tables are those appropriate to the measuring junctiontemperature in the final column. In most cases the error expressed in degreesTEMPSENSINSTRUMENTS57

celcius will be larger at lower thermocouple junction temperatures.Cable Tolerance Class Cable Temp. Measuring JunctionRangetemperatureJX ±85µV (±1.5°C) ±140µV (±2.5°C) -25°C to 200°C 500°CTX ±30µV (±0.5°C) ±60µV (±1.0°C) -25°C to +100°C 300°CEX ±120µV (±1.5°C) ±200µV (±2.5°C) -25°C to +200°C 500°CKX ±60µV (±1.5°C) ±100µV (±2.5°C) -25°C to +200°C 900NX ±60µV (±1.5°C) ±100µV (±2.5°C) -25°C to +200°C 900KCA -- ±100µV (±2.5°C) 0°C to +150°C 900KCB -- ±100µV (±2.5°C) 0°C to +100°C 900NC -- ±100µV (±2.5°C) 0°C to +150°C 900RCA -- ±30µV (±2.5°C) 0°C to +100°C 1000RCB -- ±60µV (±5.0°C) 0°C to +200°C 1000SCA -- ±30µV (±2.5°C) 0°C to +100°C 1000SCB -- ±60µV (±5.0°C) 0°C to +200°C 1000NOTE:1. Cable temperature range may be restricted to figure lower then thoseshown in the table because of temperature limitation imposed by theinsulant.2. A cable comprising two copper conductors may be used with type Bthermocouple. The expected maximum additional deviation within thecable temperature range 0°C to 100°C is 40 µV. the equivalent intemperature is 3.5°C when the measuring junction of the thermocouple isat 1400°C.TEMPSENSINSTRUMENTS58