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Thermocouple and thermocouple extension wires are flexible, insulated wires the first used to link a thermocouple to a temperature control device or make the sensing point (or probe) of the thermocouple while the second to extend a thermocouple signal from a probe back to the measuring instrument reading the signal over long distances.
There are different types of thermocouples conctructed from 2 conductor solid core thermocouple grade specified gauge insulated wires with a positive and negative lead and an insulated outer jacket. Types N, K, E, J, T are base metal thermocouple wires mostly used while Types S, R and B are precious metal thermocouple wires. Common Thermocouple Wire Types are outlined below while their more detailed presentation and characteristics are included in the Product Description section.
K-Type thermocouple (nickel-chromium (nickel-silicon - nickel-aluminum). Base metal thermocouple with strong oxidation resistance with a temperature measurement capability from 0 to 1300 °C. Main disadvantages include among others a high-temperature stability of thermoelectric potential lower than of N-type and precious metal thermocouples and a poor short-term thermal cycle stability in the range of 250-500 °C.
T-Type thermocouple (copper-copper-nickel). It has the highest accuracy and good uniformity among the base metal thermocouples and an operating temperature between -200 and 350 ℃.
J-Type thermocouple (iron-constantan ). Suitable for reducing or inert atmosphere for vacuum oxidation, and the temperature range from -200 to 800 °C.
N-Type thermocouple (NiCrSi-NiSi). Features of the thermocouple are strong anti-oxidation ability in temperature regulation below 1300 °C, good long-term stability and short-term thermal cycle repeatability, good nuclear radiation resistance, and low-temperature resistance.
E-Type thermocouple (nickel-chromium-copper-nickel [constantan] thermocouple). Its thermoelectric potential is the highest among the commonly used thermocouples. Often selected for applications in conditions of high sensitivity, low thermal conductivity, and large resistance that can be tolerated. Less sensitive than Type K to corrosion in atmospheres containing higher humidity.
Thermocouple wires of diferent types and wire sizes (Gauges) are offered as part of own labelled (AVIATIONEU NEW ERA) product lines. Priced and sold by the foot and offered in specified or cut to order lengths (usually in 10 ft increments).