Alumel is an alloy consisting of approximately 95% nickel, 2% manganese, 2% aluminium and 1% silicon. This magnetic alloy is used for thermocouples and thermocouple extension wire. Alumel is a registered trademark of Concept Alloys, Inc. Properties of Alumel: In thermocouples, alumel is often used together with chromel to form type K thermocouples...
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http://en.wikipedia.org/wiki/Alumel
Trade name for an alloy of nickel with up to 5% aluminium, manganese and silicon, used with chromel in K-type thermocouples.
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https://www.encyclo.co.uk/local/20687
An aluminum nickel alloy used in the negative leg of a Type K thermocouple (Trade name of Hoskins Manufacturing Company).
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https://www.encyclo.co.uk/local/20850
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