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Manganin is a trademarked 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 resistors , particularly ammeter shunts , because of its virtually zero temperature coefficient of ...
Copper alloys of manganese, such as Manganin, are commonly found in metal element shunt resistors used for measuring relatively large amounts of current. These alloys have very low temperature coefficient of resistance and are resistant to sulfur. This makes the alloys particularly useful in harsh automotive and industrial environments.
In addition, constantan is characterized by a good fatigue life and relatively high elongation capability. However, constantan tends to exhibit a continuous drift at temperatures above 65 °C (149 °F); [ 5 ] and this characteristic should be taken into account when zero stability of the strain gauge is critical over a period of hours or days.
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Other constant-resistance alloys include manganin (Cu 86 Mn 12 Ni 2), Cupron (Cu 53 Ni 44 Mn 3) [2] and Evanohm. Melts at about 1,220 °C (2,230 °F). Melts at about 1,220 °C (2,230 °F). Balco ( Ni 70 Fe 30 ) and similar alloys have very high, but more linear, temperature coefficients of resistivity, making them suitable for sensing elements.
Most iron alloys are steels, with carbon as a major alloying element.. Elinvar (nickel, chromium); Fernico (nickel, cobalt); Ferroalloys (Category:Ferroalloys) . Ferroboron ...
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For manganin, a common shunt material, at 80 °C thermal drift begins to occur, at 120 °C thermal drift is a significant problem where error, depending on the design of the shunt, can be several percent and at 140 °C the manganin alloy becomes permanently damaged due to annealing resulting in the resistance value drifting up or down.
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