NickelAlumel

NickelAlumel is a nickel-based alloy commonly used as the negative leg in Type K thermocouples. It is primarily composed of nickel, with additions of aluminum, manganese, and silicon. The specific composition is typically around 95% nickel, 2% aluminum, 2% manganese, and 1% silicon. This alloy is designed to exhibit a stable and predictable thermoelectric voltage output when paired with a positive leg, usually Chromel (a nickel-chromium alloy).

Type K thermocouples, which utilize Alumel as the negative conductor, are widely employed across various industries due to their broad temperature range, good linearity, and relatively low cost. They are effective in oxidizing or inert atmospheres and can measure temperatures from cryogenic levels up to approximately 1260 degrees Celsius (2300 degrees Fahrenheit). Alumel's resistance to oxidation at high temperatures is a key characteristic contributing to the reliability of Type K thermocouples. The precise manufacturing and calibration of Alumel wire are crucial to ensure accurate temperature measurements.