Product Code Database
Manganin is a name for an alloy of typically 84.2% copper, 12.1% manganese, and 3.7% nickel. It was first developed by Edward Weston in 1892, improving upon his Constantan (1887).
Manganin foil and wire is used in the manufacture of , particularly ammeter shunts, because of its virtually zero temperature coefficient of resistance value and long term stability. Several Manganin resistors served as the legal standard for the ohm in the United States from 1901 to 1990. Manganin wire is also used as an electrical conductor in Cryogenics, minimizing heat transfer between points which need electrical connections.
Manganin is also used in gauges for studies of High pressure shock waves (such as those generated from the detonation of explosives) because it has low strain sensitivity but high hydrostatic pressure sensitivity.
Manganin wire as we know it was developed by Weston's assistant John Forrest Kelly. In May 1893, Weston received a patent for the material and its use for resistors. While Manganin represented a significant advance in technology -- the material was a conductive metal with constant resistance over a wide range of working temperatures, Weston did not receive wide recognition at the time.
| + Cu84/Mn12/Ni4 | |
| 12 | +.000006 |
| 25 | .000000 |
| 100 | −.000042 |
| 250 | −.000052 |
| 475 | .000000 |
| 500 | +.00011 |
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