Thermocouple
Demystifying the Science behind high-Temperature Instruments

Materials used for Thermocouple

There are a lot to thermocouple types, Each type of thermocouple exist for its unique properties. All this properties come from the metals and alloys used in the thermocouple.

We will try to list the material used and there properties that make them special.

Below is a list of material used to make thermocouple. Please note Seebeck Coefficent is in reference to Platinum.

Alloy:Chromel
Composition:90% nickel and 10% chromium
Melting Point:1420°C
Seebeck Coefficent:22μV/K
Lead Type:Positive
Note: K Type Thermocouple

Alloy:Alumel
Composition:95% nickel, 2% aluminum, 2% manganese
Melting Point:1399°C
Seebeck Coefficent:-17. 3
Lead Type:Negetive
Note: K Type Thermocouple

Alloy:Iron
Composition:Iron
Melting Point:1538°C
Seebeck Coefficent:19
Lead Type:Positive
Note: J Type Thermocouple

Alloy:Eureka/Constantan
Composition:55% copper and 45% nickel
Melting Point:1210°C
Seebeck Coefficent:-35
Lead Type:Negetive
Note: J Type Thermocouple

Alloy:Copper
Composition:Copper
Melting Point:1085°C
Seebeck Coefficent:6.5
Lead Type:Positive
Note: T Type Thermocouple

Alloy:Pt90Rh10
Composition:Pt90Rh10
Melting Point:1855°C
Seebeck Coefficent:5.4
Lead Type:Positive
Note: S Type Thermocouple

Alloy:Pt87Rh13
Composition:
Melting Point:1890°C
Seebeck Coefficent:5.3
Lead Type:Positive
Note: R Type Thermocouple

Alloy:Platinum
Composition:
Melting Point:1768°C
Seebeck (By Def): 0
Lead Type:Negetive
Note: R Type Thermocouple

Alloy:Nicrosil
Composition:
Melting Point:1420°C
Seebeck Coefficent:29.3
Lead Type:Positive
Note: N Type Thermocouple

Alloy:Nisil
Composition:
Melting Point:1420°C
Seebeck Coefficent:-11
Lead Type:Negetive
Note: N Type Thermocouple

Alloy:NiMo
Composition:82%Ni/18%Mo
Melting Point: 1560 °C
Seebeck Coefficent:
Lead Type:Positive
Note: M Type Thermocouple

Alloy:NiCo
Composition:99.2%Ni/0.8%Co
Melting Point:1375°C
Seebeck Coefficent:
Lead Type:Negetive
Note: M Type Thermocouple

Alloy:WRe
Composition:95%W/5%Re
Melting Point:3350°C
Seebeck Coefficent:
Lead Type:Positive
Note: C Type Thermocouple

Alloy:W
Composition:
Melting Point:3410°C
Seebeck Coefficent:7.5
Lead Type:Positive
Note: G Type Thermocouple

Alloy:PdPtAu
Composition:
Melting Point:
Seebeck Coefficent:
Lead Type:Positive
Note: P Type Thermocouple

Alloy:AuPd
Composition:
Melting Point:
Seebeck Coefficent:
Lead Type:Negetive
Note: P Type Thermocouple


Alloy: Composition: Melting Point: Seebeck Coefficent: Lead Type:
Alumel 95% nickel, 2% aluminum, 2% manganese 1399°C -17. 3 Negetive
Iron Iron 1538°C 19 Positive
Eureka/Constantan 55% copper and 45% nickel 1210°C -35 Negetive
Copper Copper 1085°C 6.5 Positive
Pt90Rh10 Pt90Rh10 1855°C 5.4 Positive
Pt87Rh13 Pt87Rh13 1890°C 5.3 Positive
Pt70Rh30 Pt70Rh30 1930°C Positive
Pt94Rh6 Pt94Rh6 1850°C Negetive
Platinum Platinum 1768°C (By Def) 0 Negetive
Nicrosil Nickel83.8%,14.4% chromium,1.4% silicon 1420°C 29.3 Positive
NiMo 82%Ni/18%Mo 1560 °C Positive
NiCo 99.2%Ni/0.8%Co 1375°C Negetive
WRe 95%W/5%Re 3350°C Positive
W W 3410°C 7.5 Positive
PdPtAu Positive
AuPd Negetive

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