Type E Thermocouple Wire Description
The NiCr-CuNi thermocouple (Type E) is also referred to as the NiCr-Constantan thermocouple. The principal chemical composition of the positive leg, NiCr (EP), is approximately 90% Ni and 10% Cr; the negative leg, Constantan (EN), comprises approximately 55% Cu and 45% Ni. The operating temperature range of the Type E thermocouple is –200 to 900°C.
Type E produces a stronger signal and higher accuracy than Type K or Type J at moderate temperature ranges up to 1 000°F. Type E is more stable than Type K, thereby increasing its measurement accuracy.

Type E Thermocouple Wire Specifications
Type
|
Chemical Composition in %
|
Ni
|
Cr
|
Cu
|
Si
|
Al
|
NiCr (Anode)
|
90
|
10
|
/
|
/
|
/
|
CuNi (Cathode)
|
45
|
/
|
55
|
/
|
/
|
Type
|
EMF versus Pt.67 (mV)
|
100°C
|
200°C
|
400°C
|
600°C
|
800°C
|
NiCr (EP)
|
2.784-2.844
|
5.938-6.002
|
12.709-12.819
|
19.537-19.699
|
26.102-26.308
|
CuNi (EN)
|
3.467-3.543
|
7.410-7.492
|
16.109-16.255
|
25.362-25.588
|
34.664-34.960
|
NiCr-CuNi (EP-EN)
|
6.251-6.387
|
13.348-13.494
|
28.818-29.074
|
44.899-45.287
|
60.766-61.268
|
Type
|
Density at 20°C (g/m³)
|
Melting Point (°C)
|
Tensile Strength (annealed at 20°C) (MPa)
|
Elongation (annealed at 20°C) (%)
|
Specific Resistivity at 20°C (µΩ·m)
|
NiCr (EP)
|
8.5
|
1 427
|
≥490
|
≥10
|
0.71
|
CuNi (EN)
|
8.5
|
1 220
|
≥390
|
≥25
|
0.5
|
Type E Thermocouple Wire Applications
- For cryogenic applications.
- For applications where magnetic fields are generated, given that Type E is inherently non-magnetic.
- In the aerospace industry, where a rapid response is required.
- Measurement of gas temperature in a flow chamber.