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Cu- CuNi (Constantan) thermocouple (Type T)

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Cu-CuNi thermocouple (type T) is also named Cu- Constantan thermocouple. The positive leg Cu(TP) is made by pure Copper, and the main chemical composition of negative leg Constantan (TN) is Cu: Ni≈ 55%: 45%. Although EN, TN, JN are all called Constantan, TN and EN don not give the same EMF output curve as JN. EN and TN are able to interchange but they are not interchangeable with JN. The operating temperature range of type T thermocouple is -200~350℃, Due to the low resistance of oxidation that Copper has, it is not advisable to go beyond that range.

Type T thermocouple has good resistance to oxidation, high EMF output, with good temperature accuracy, sensitivity and stability. In the temperature range -200~0℃, it has better property, the year stability is less than ±3μV

TYPE Chemical Composition%
Ni Cu Mn Si Fe
TP / 100 / / /
TN 45 55 / / /

Standard:IEC60584-1

TYPE EMF Versus Pt.67(mV)
100℃ 200℃ 300℃
TP 4.229~4.325 9.238~9.334 14.792~14.932
TN 0.763~0.783 1.826~1.846 3.137~3.161
TP-TN 3.484~3.524 7.412~7.488 11.655~11.771

PhysicalProperties:

Type Density at 20℃(g/cm³) Melting point(℃) Tensile Strength(Soft annealed condition in 20℃)(Mpa) Elongation(Soft annealed condition in 20℃)(%) Resistivity at 20℃ (μΩ.m)
TP 9 1084 ≥190 ≥20 0.018
TN 8.9 1220 ≥390 ≥25 0.5

 

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