CuNi44 Copper Nickel Ribbon/ Wire Coil 1.2mm-2mm Resistance Wire
Constantan Wire Resistance
The resistance of constantan wire is 15.94 ohm-cmil/ft. Since the resistance of constantan does not change with temperature, it is used for the purpose of making thermocouples and other such appliances where the resistance should remain constant for a particular range of temperature. It is an electric resistance wire.
Uses of Constantan
Constantan is used for the measurement of temperature. It is used for the formation of thermocouple, along with the wires of other metals such as copper, iron and chromel. It is especially used for resistance purpose since its resistance does not change much with the change in its temperature. It is used for DC current shunts. In the DC current shunts, the precision low value resistance wire is placed in series with the load in a direct current circuit, which is already carrying a high current. It one measures the voltage drop; he can easily measure the current.
Constantan Alloy
Constantan is one of the most widely used alloys. This is owing to the fact that it has the best overall composition of the important properties that is needed for many of the strange gauge applications. Constantan has the highest resistivity among all the other alloys, which makes it insensitive to the level of strain and temperature. Its resistivity is so high that it can also achieve suitable resistance levels in very small grids also. The temperature coefficient of resistance is not at all excessive in case of constantan alloy. Therefore it has very many advantages over the other alloys.
Constantan has a good fatigue life and a very high elongation capacity also. All these additional properties make it a highly useful and good alloy. But this alloy shows drift at the temperature range of 65 °C, therefore this point should be kept n mind when one tests the stability strain if the gauge, since its stability strain is critical at this temperature.
Constantan Applications
The application of constantan falls in three important categories:
Temperature Measurement
Constantan is used for the formation of thermocouples with the wires of copper, iron and chromel. It is used to form Chrome- constantan thermocouples and good iron constantan thermocouples also.
Heavy Duty Industrial Rheostats
Constantan is an ideal alloy for the electric motor starter resistances and for heavy duty industrial rheostats. Since it has a high specific heat resistance, and a good ductile nature, it satisfies the entire important requirement for this category of specifications. Constantan is transformed into wires of large size or this kind of requirements.
Wire Wound Precision Resistors
Constantan is one of the most widely used alloys in wire wound precision resistors, volume control devices and temperature stable potentiometers. It is a main attraction in this field owing to the fact that it has negligible temperature coefficient and high resistance.
Development of a high thermal E.M.F – This is another important property of constantan, that it develops a high thermal E.M.F against other metals. It is therefore used in thermocouple alloys, with other metals like iron and copper.
| Chemical Composition | Designations | Typical Applications |
| Element | Min | Max | | C | – | 0.10 | | Si | – | 0.50 | | Mn | – | 1.00 | | Fe | – | 1.00 | | Cu | 55.00 nominal | | Ni | bal | | W.Nr. 2.0842
AWS 081 | Power resistors, shunts, thermocouples and wire-wound precision resistors having operating temperatures up to 400 °C (750 °F). |
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CuNi44 Copper Nickel Alloy Wire Coil 1.2mm-2mm Resistance Min 43% Ni Content Images
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