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THERMOCOUPLE SELECTING SENSOR CABLES: GUIDE TO INSULATION & COVERING Which insulation Material? COLOUR CODES: THERMOCOUPLE CONNECTORS, EXTENSION AND COMPENSATING WIRES AND CABLES INSULATION COLOUR CODES CABLE Extension & Compensating Leads CODE FORMER STANDARD IEC 60584-3(2007) EX NICKEL CHROMIUM/CONSTANTAN (Nickel Chromium/Copper Nickel, Chromel/Constantan, T1/Advance, NiCr/Constantan) _ IRON*/CONSTANTAN (Iron/Copper Nickel, Fe/Konst Iron/Advance, Fe/Constantan I/C) NICKEL CHROMIUM/NICKEL ALUMINIUM* (NC/NA, Chromel/ Alumel, C/A, T1/T2, NiCr/Ni, NiCr/ NiAL) COPPER/CONSTANTAN (Copper/Copper Nickel, Cu/Con, Copper/Advance) EX JX KX NX NC TX Screened or unscreened? With long cable runs, the cable may need to be screened and earthed at one end (at the instrument) to minimise noise pick-up (interference) on the measuring circuit. Alternative types of screened cable construction are available and these include the use of copper or mylar screening. Twisted pair configurations are offered and these can incorporate screening as required. v^ THERMOCOUPLE ACCURACIES Tolerance classes for thermocouples to IEC 60584-2(1982) (Amend 1-1989) BS EN60584-2(1993) Fe-Con (J) Class 1 - 40 +750°C: ±0.004 . t or ±1.5°C Vx COPPER/CONSTANTAN (LOW NICKEL) (Cu/Constantan) Compensating for K (Cu/Constantan) COPPER/COPPER NICKEL Compensating for Platinum 10% or 13% Rhodium/Platinum (Codes S & R respectively) (Copper/Cupronic Cu/CuNi, Copper/No. 11 Alloy) * Magnetic, ( ) Alternative & Trade Name FOR THERMOCOUPLE CONNECTORS body colours are similar to outer sheath colours FOR THERMOCOUPLE CONNECTORS body colours are similar to outer sheath colours CALIBRATION GUIDE Thermocouple Type 100°C t = actual temperature Use the larger of the two deviation values

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PLATINUM RESISTANCE THERMOMETER PRACTICAL BRIDGE CIRCUITS FOR 2, 3 AND 4 WIRE THERMOMETERS The connection between the thermometer assembly and the instrumentation. The cabling introduces electrical resistance which is placed in series with the resistance thermometer. The two resistances are therefore cumulative and could be interpreted as an increased temperature if the lead resistance is not allowed for. The longer and/or the smaller the diameter of the cable, the greater the lead resistance will be and the measurement errors could be appreciable. In the case of a 2 wire connection, little...

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Wall Chart
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