Compensation wire specifications and models

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1. Overview A compensation wire (compensation cable) refers to a pair of insulated wires that, within a certain temperature range, possess a nominal electromotive force identical to that of the thermocouple they are paired with. These wires are used to connect the thermocouple to temperature display and control instruments, in order to compensate for errors caused by temperature changes at the points where they connect to the thermocouple. Compensation wires (compensation cables) are suitable for single-point or multi-point connection of automatic temperature measurement instruments in industries such as electricity, metallurgy, petroleum, chemicals, and light textiles, as well as in sectors like national defense and scientific research. 2. Product standards: Compensation wire: GB/T4989-94 3. Operating characteristics: Operating temperature: Heat resistance grades: -65 ℃ ~+200 ℃ and -65 ℃ ~+260 ℃ ； Standard grade: two options, -40 ℃ ~+70 ℃ and -40 ℃ ~+105 ℃ ； Small bending radius: Compensation wire: not less than 8 times the outer diameter of the conductor ； Compensation cable: When armored, it should be no less than 12 times the outer diameter of the cable; when unarmored, it should be no less than 6 times the outer diameter of the cable. 4. Main technical specifications: Model, alloy wire material, and insulation color. Model, Thermocouple, Calibration number, Compatible thermocouple, Alloy wire for compensation wire, Insulation layer color, Positive pole, Negative pole, Positive pole, Negative pole: BC, B – Platinirhodium 30-, Platinirhodium 6, Copper, Copper, Gray; SC, S – Platinirhodium 10-, Platinum, SPC (Copper), SNC (Copper-nickel 0.6), Red, Green; RC, R – Platinirhodium 13-, Platinum, RPC (Copper), RNC (Copper-nickel 0.6), Red, Green; KCA, K – Nickel-chromium -, Nickel-silicon, KPCA (Iron), KNCA (Copper-nickel 2), Red, Blue; KCB, KPCB (Copper), KNCB (Copper-nickel 4), Red, Blue; KX, KPX (Nickel-chromium 10), KNX (Nickel-silicon 3), Red, Black; NC, N – Nickel-chromium-silicon -, Nickel-silicon, NPC (Iron), NNC (Copper-nickel 18), Red, Gray; NX, NPX (Nickel-chromium 14 with silicon), NNX (Nickel-silicon 4), Red, Gray; EX, E – Nickel-silicon -, Nickel-silicon, EPX (Nickel-chromium 10), ENX (Copper-nickel 45), Red, Brown; JX, J – Iron – Copper-nickel, JPX (Iron), JNX (Copper-nickel 45), Red, Purple; TX, T – Copper – Copper-nickel, TPX (Copper), TNX (Copper-nickel 45), Red, White. WC3/25, WRe3-WRe25 – Tungsten – Tungsten-rhenium 25, WPC3/25, WNC3/25, Red, Yellow; WC5/26, WRe5-WRe26 – Tungsten-rhenium 5 – Tungsten-rhenium 26, WPC5/26, WNC5/26, Red, Orange. Application categories and insulation layer colors: Application category, Accuracy grade and marking, Insulation layer color: Ordinary grade, Precision grade, Ordinary grade, Precision grade. Generally used: G/S, Black, Gray; For high-temperature applications: H/S, Black, Yellow. Tolerances and alternating resistance: Model of compensation wire, Alternating resistance at 20°C in ohms per meter, Not more than: 0.2 mm², 0.5 mm², 1.0 mm², 1.5 mm², 2.5 mm²; NC or BC: 0.25, 0.10, 0.05, 0.03, 0.02. KCA: 3.50, 1.40, 0.70, 0.47, 0.28; KCB: 2.60, 1.40, 0.70, 0.47, 0.28; KX: 5.50, 2.20, 1.10, 0.73, 0.44; EX: 6.25, 2.50, 1.10, 0.73, 0.44; JX: 6.25, 2.50, 1.25, 0.83, 0.50; TX: 3.25, 1.30, 0.65, 0.43, 0.26; NC: 3.75, 1.50, 0.75, 0.50, 0.30; N: 7.15, 2.86, 1.43, 0.95, 0.57. WC3/25: 0.50, 0.20, 0.10, 0.07, 0.04; WC5/26: 0.50, 0.20, 0.10, 0.07, 0.04. Insulation resistance (at 20°C): For PVC insulation, it should be no less than 25 MΩ·Km ； The FEP or PEA insulation should be no less than 100 MΩ·Km. Flame-retardant properties: Meets Class A standards (tested in accordance with GB12666.5-90). Specifications: Structure\Cross-sectional area in mm2 – 0.2, 0.5, 1.0, 1.5, 2.5. Number of conductor pairs: Single-conductor core dimensions in mm – 1/0.52, 1/0.80, 1/1.13, 1/1.37, 1/1.76. For 1 pair of conductors; cables can have 2–37 pairs. Multi-conductor core dimensions in mm – 7/0.20, 7/0.30, 7/0.43, 7/0.52, 19/0.41