EP Extension Grade Thermocouple Wire
Thermocouple Extension Wire
Type E Thermocouple extension wire (EP--Ni-Cr, EN-Cu-Ni) offers stronger signal and higher accuracy than Type K or Type J at moderate temperature ranges up to 1,000°F. Its enhanced stability compared to Type K contributes to superior measurement precision.
Our manufacturing facility specializes in producing various thermocouple compensating wires including KX, NX, EX, JX, NC, TX, SC/RC, KCA, and KCB types for temperature measurement instruments and cables. All products comply with:
- GB/T 4990-2010 'Alloy wires of extension and compensating cables for thermocouples' (Chinese National Standard)
- IEC584-3 'Thermocouple part 3-compensating wire' (International standard)
These instrumentation cables feature construction similar to pair instrumentation cable but with specialized conductor materials designed for process temperature measurement. They maintain thermo-electric (emf) properties matching the connected thermocouples.
Thermocouple Wire Specifications
| Code |
Positive Leg |
Negative Leg |
| N |
Ni-cr-si (NP) |
Ni-si-magnesium (NN) |
| K |
Ni-Cr (KP) |
Ni-Al(Si) (KN) |
| E |
Ni-Cr (EP) |
Cu-Ni<constantan> (EN) |
| J |
Iron (JP) |
Cu-Ni<constantan> (JN) |
| T |
Copper (TP) |
Cu-Ni<constantan> (TN) |
Compliance Standards
| ASTM |
ANSI |
IEC |
DIN |
BS |
NF |
JIS |
GOST |
| E 230 |
MC 96.1 |
584-1/2/3 |
EN 60584 -1/2 |
4937.1041, EN 60584 - 1/2 |
EN 60584 -1/2 - NFC 42323 - NFC 42324 |
C 1602 - C 1610 |
3044 |
Working Temperature Range
| Diameter (mm) |
Long Term Working Temp (°C) |
Short Term Working Temp (°C) |
| 0.3, 0.5 |
350 |
450 |
| 0.8, 1.0, 1.2 |
450 |
550 |
| 1.6, 2.0 |
550 |
650 |
| 2.5 |
650 |
750 |
| 3.2 |
750 |
900 |
Detailed Technical Parameters
| Thermocouple Type |
Compensation Wire |
Usage Classification |
Temp (°C) |
Standard EMF (μV) |
Precision Grade Tolerance (μV) |
Precision Grade Range (μV) |
General Grade Tolerance (μV) |
General Grade Range (μV) |
| E (EX) |
G |
-25 |
-1,432 |
±81 |
-1,351~-1,513 |
±138 |
-1,294~-1,570 |
| E (EX) |
G |
100 |
6,319 |
±81 |
6,238~6,400 |
±138 |
6,181~6,457 |
| E (EX) |
H |
-25 |
-1,432 |
±81 |
-1,351~-1,513 |
±138 |
-1,294~-1,570 |
| E (EX) |
H |
100 |
6,319 |
±81 |
6,238~6,400 |
±138 |
6,181~6,457 |
| E (EX) |
H |
200 |
13,421 |
±81 |
13,340~13,502 |
±138 |
13,283~13,559 |
Size Range & Temperature Specifications
Wire Diameters: 0.10 to 8.0 mm
Type E Temperature Range:
- Thermocouple grade wire: -454°F to 1600°F (-270°C to 870°C)
- Extension wire: 32°F to 392°F (0°C to 200°C)
Type E Accuracy (whichever is greater):
- Standard: ±1.7°C or ±0.5%
- Special Limits of Error: ±1.0°C or ±0.4%