| Code |
Alloy combination |
Max. useful temp.
range |
Max. thermocouple
grade temp. range |
International IEC 584-3 |
International IEC 584-3
Intrinsically Safe |
British BS 1843 |
| + lead |
- lead |
| J |
Iron
(Fe) |
Constantin
Copper-Nickel
(Cu-Ni) |
Thermocouple grade
0 to 750°C
Extension grade
0 to 200°C |
-210 to
+1200°C |
 |
 |
 |
| K |
Nickel-Chromium
(Ni-Cr) |
Nickel-Aluminium
(Ni-Al) |
Thermocouple grade
-200 to 1250°C
Extension grade
0 to 200°C |
-270 to
1372°C |
 |
 |
 |
| V |
Copper
(Cu) |
Constantin
Copper-Nickel
(Cu-Ni) |
Extension grade
0 to 80°C |
|
|
|
 |
| T |
Copper
(Cu) |
Constantin
Copper-Nickel
(Cu-Ni) |
Thermocouple grade
-250 to 350°C
Extension grade
-60 to 100°C |
-270 to
400°C |
 |
 |
 |
| E |
Nickel-Chromium
(Ni-Cr) |
Constantin
Copper-Nickel
(Cu-Ni) |
Thermocouple grade
-200 to 900°C
Extension grade
0 to 200°C |
-270 to
1000°C |
 |
 |
 |
| N |
Nicrosil
(Ni-Cr-Si) |
Nisil
(Ni-Si-Mg) |
Thermocouple grade
-270 to 1300°C
Extension grade
0 to 200°C |
-270 to
1300°C |
 |
 |
 |
| R |
Platinum - 13% Rhodium
(Pt-13%Rh) |
Platinum
(Pt) |
Thermocouple grade
0 to 1450°C
Extension grade
0 to 150°C |
-50 to
1768°C |
 |
 |
 |
| S |
Platinum - 10% Rhodium
(Pt-10%Rh) |
Platinum
(Pt) |
Thermocouple grade
0 to 1400°C
Extension grade
0 to 150°C |
-50 to
1768°C |
|
|
|
| U |
Copper
(Cu) |
Copper - Low Nickel
(Cu-Ni) |
Extension grade
0 to 50°C |
|
|
|
|
