Manganin
Manganin (CuMn12Ni) is the brand name of a copper - nickel - manganese - alloy having a composition (by mass) of 82-84% copper, 12-15% manganese and 2-4% nickel. It is a resistance alloy with an average specific electrical resistance of around 4.3 · 10 −7 Ωm and a low temperature dependence of the resistance ( linear temperature coefficient α = 0.02 · 10 −3 K −1 ). The resistance and temperature curve is not as flat as with constantan ; the corrosion resistance is also lower. Manganin was registered in 1903 as a trademark (brand) for Isabellenhütte Heusler , which also developed the Isaohm alloy .
application areas
Due to its low temperature dependence, manganin is often used as a measuring wire. In low-temperature physics, manganine wires are used as measuring lines in cryostats because of their low thermal conductivity . Since they have a relatively high resistance (with typical diameters: 100 Ω / m), the four-wire measurement is appropriate when measuring small resistances .
Web links
- Manufacturer and brand owner: Isabellenhütte Heusler GmbH & Co. KG in Dillenburg (data sheets etc.)