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An alloy containing 94% nickel, 2% aluminum, 3% chromium, and 1% silicon; used to form the chromel-alumel thermocouple.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



an alloy used in pyrometry as the negative ther-moelectrode of the Chromel-Alumel thermocouple and also as a compensation conductor.

The chemical composition of Alumel is 1.8–2.5 percent aluminum, 0.85–2.0 percent silicon, and 1.8–2.2 percent manganese; the remainder is nickel and cobalt. The cobalt is present as an impurity of nickel and, to ensure the required value of the thermoelectric force, its content must be within the range of 0.6–1.0 percent. Thermocouples with Alumel are used in measuring temperatures up to 1000°C. On prolonged exposure at above 1000°C, a change in thermoelectric force becomes very noticeable. Alumel alloys have been developed and used which contain 0.06 -0.1 percent zirconium or 0.06 percent zirconium plus 0.005–0.03 percent boron and other metals. Such alloying of Alumel substantially increases its ductility (at temperatures of 600–1100°C) and durable strength (at temperatures of 700 -900°C), as well as improving the stability of its thermoelectric force at temperatures up to 1250 -1300°C.


Berkovskii, I. Ia., and A. G. Kolokolova. Nikelevye splavy.
Moscow-Leningrad, 1941. Popov, M. M. Termometriia i kalorimetriia, 2nd ed. Moscow, 1954.
Smiriagin, A. P. Promyshlennye tsvetnye metally i splavy, 2nd ed. Moscow, 1956.
“Issledovanie splavov dlia termopar.” Trudy instituta “Giprots-vetmetobrabotki,” 1964, vol. 22; 1967, vol. 25.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Workability is the major selection factor: Type K thermocouples are designed for inert atmospheres and if the applications are associated with the after effects of oxidizing then Type K Chromel and Alumel thermocouples are the best bet.
The thermocouples are chosen for use in temperature measurements; the thermocouple type is K-type (Chromel +, Alumel -).
The classical thermoelectric materials used in devices are metals and metallic alloys, for example, Al, Cu, Ni, Bi, Sb, chromel, and alumel as well as semiconductors PbTe and [Bi.sub.2][Te.sub.3].
The thermocouples used are of K type, chromel (+), alumel (-) alumel, and the measurement field are -50 ...
As such, we are developing connectors under similar assumptions with more exotic materials, such as chromel, alumel, inconel, tellurium, and composites for thermal coupling through a contact system.
Twenty-five 30 gauge Chromel Alumel thermocouples (Omega Engineering, Stamford, Connecticut, USA) connected to two underground Campbell CR10 data loggers (Campbell Scientific, North Logan, Utah, USA) were placed horizontally under the litter layer at the mineral soil surface in the first 13 transect plots extending in each direction from the base of the L.
A line of hermetic headers, connectors, and feedthroughs uses pins made of Alumel, Chromel or Copper.
Conventional iron-constantan or chromel alumel thermocouples, for example, begin to lose accuracy and reliability.
Type K thermocouples are formed by welding together a Chromel (nickel with 10% chromium) wire and an Alumel (nickel with 5% aluminum silicon) wire and are suitable for measuring temperature differences from -200[degrees]C to +1,350[degrees]C.