Thermocouple copel wire CuNi40
Copel is a cupronickel thermocouple alloy that consists of nickel (43−44%), ferrum (2−3%) and manganese (0,5%.). A residual portion constitutes cuprum. This alloy is similar to analogous alloy — constantan.
Percentage composition of copel thermocouple CuNi43
A grade CuNi44 is the most common alloy. It can be delivered in a form of wire (Ø 0,10 — 11,5 mm), rod (Ø 12,0 — 100,0 mm) and strip (0,1−5,0 mm of thickness and 3−600 mm of widths).
Percentage composition of copel thermocouple CuNi40
|≤ 0.1||≤ 0.15||42.5 — 44||≤ 0.1||0.6||54.4 — 57.4|
0.1 — 1
It has a high corrosive resistance and heat resistance. An alloy is capable of withstanding a heating up 800 ° C without a loss of the main properties. Maximum thermo-electromotive force appears in combination with cuprum, ferrum, chromel. In this condition, a coefficient of thermal real resistance is quite poor. Such properties are typical only to this alloy.
A density is 8,9 g/cm³, a melting point is 1290 °C. An annealing can be done at a temperature of 800−850°C, and a hot working at 1150 °C. A coefficient of unit-area resistance is 0,5 Ohm-mm2/m; a linear expansion is 14·10−6/°C. At a temperature of 100 °C a thermoelectromotive force equals to 6,95 V and at 600 °C, it rises to 49,0 V.
|Number||Material||Grade||Size (mm)||Rolles stock type||Price|
|1||copel||copel thermocouple CuNi40||Ø 0,1−11,5||wire||contractual|
||copel thermocouple CuNi40
|3||---«---||copel thermocouple CuNi40||3х600 mm||strip|
It is commonly used in pyrometry more often in a form of wire (Ø 0,2 — 3,2 mm), less often in a form of strip, rod for manufacturing thermocouples, heating controllers, compensating lead wires. The thermocouple consists of electric conductor fumes, that are soldered in one end and placed into environment oriented for thermometry («hot junction»). Then, exposed ends are going to be placed into a thermostatic regulator (so-called cold junction). Thanks to alloyage, thermocouple of this kind can stand a short-term effect of temperature up 1300 °C and work in an aggressive environment.
In therms of thermal emf, number one is thermocouple copel-chromel that is used durably at temperatures up 800 °C; number two is cuprum-copel, and then in descending order is copel-ferrum (up to 760°C). Compensating lead wires carry out a transfer of thermoelectromotive force to a measuring device. For such wires is used cheaper wire. Copel, constantan are utilized in measuring electrical gauge for manufacturing the resistance standards.
Physical characteristics at a temperature 20 °C
|Hardness, soft alloy HB 10 -1||90 MPa|
|Hardness, hard alloy HB 10 -1||195 MPa|
|Hot working temperature|
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