Thermocouple Extension Wire
Type T Thermocouple extension wire (TP--Copper, TN--Cu-Ni):
Cu-CuNi thermocouple extension (type T) is also named Cu-Constantan thermocouple. It is a very stable thermocouple and is often used in extremely low temperature applications such as cryogenics or ultra low freezers. It is found in other laboratory environments as well. The type T has excellent repeatability between –380F to 392F (–200C to 200C).
Our plant mainly manufacture type KX, NX, EX, JX, NC, TX, SC/RC, KCA, KCB compensating wire for thermocouple, and they are used in temperature measurement instruments and cables. Our thermocouple compensating products are all made abiding by GB/T 4990-2010 'Alloy wires of extension and compensating cables for thermocouples' (Chinese National Standard), and also IEC584-3 'Thermocouple part 3-compensating wire' (International standard).
The thermocouple compensation cables can also be termed as instrumentation cables, since they are used for process temperature measurement. The construction is similar to pair instrumentation cable but the conductor material is different. Thermocouples are used in processes to sense temperature and is connected to the pyrometers for indication and control. The thermocouple and pyrometer are electrically conducted by thermocouple extension cables / thermocouple compensating cables. The conductors used for these thermocouple cables are required to have similar thermo-electric (emf) properties as that of the thermocouple used for sensing the temperature.
Thermocouple Wire
| Code | Wires component of the thermocouple |
| +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) |
Standards
| ASTM | ANSI | IEC | DIN | BS | NF | JIS | GOST |
| (American Society for Testing and Materials) E 230 | (American National Standard Institute) MC 96.1 | (European Standard by the International Electrotechnical Commission 584)-1/2/3 | (Deutsche Industrie Normen) EN 60584 -1/2 | (British Standards) 4937.1041, EN 60584 - 1/2 | (Norme Française) EN 60584 -1/2 - NFC 42323 - NFC 42324 | (Japanese Industrial Standards) C 1602 - C 1610 | (Unification of the Russian Specifications) 3044 |
Detailed Parameter of thermocouple wire
| Thermocouple No. indexing | Compensation wire type | Usag Classification | Measuring junction temperature / ℃ | standard EMF value/μV | Precision grade | General grade |
| Tolerance μV | Thermal EMF range μV | Tolerance μV | Thermal EMF range μV |
| SorR | SC or RC | G | 100 | 646 | ±30 | 616~676 | ±60 | 586~706 |
| H | 100 | 646 | - | - | ±60 | 586~706 |
| H | 200 | 1 1441 | - | - | ±60 | 1.381~1 501 |
| H | | | | | | |
| K | KX,KCA | G | -25 | -968 | ±40 | -924~-1 012 | ±80 | -880~-1 056 |
| or KCB | G | 100 | 4 096 | ±40 | 4 052~4 140 | ±80 | 4 008~4 184 |
| H | -25 | -968 | ±40 | -924~-1 012 | ±88 | -880~-1 056 |
| H | 100 | 4 096 | ±40 | 4 052~4 140 | ±88 | 4 008~4 184 |
| H | 200 | 8 138 | ±40 | 8 094~8 182 | ±88 | 8 050~8 226 |
| N | NX or NC | G | -25 | -646 | ±43 | -603~-689 | ±86 | -560~-732 |
| G | 100 | 2 774 | ±43 | 2 731~2 817 | ±86 | 2 688~2 860 |
| H | -25 | -646 | ±43 | -603~-690 | ±86 | -560~-732 |
| H | 100 | 2 774 | ±43 | 2 731~2 817 | ±86 | 2 688~2 860 |
| H | 200 | 5 913 | ±43 | 5 870~5 956 | ±86 | 5 827~5 999 |
| E | EX | G | -25 | -1 432 | ±81 | -1 351~-1 513 | ±138 | -1 294~-1 570 |
| G | 100 | 6 319 | ±81 | 6 238~ 6400 | ±138 | 6 181~6 457 |
| H | -25 | -1 432 | ±81 | - 177~-1 513 | ±138 | -1 294~-1 570 |
| H | 100 | 6 319 | ±81 | 6 238~6 400 | ±138 | 6 181~6 457 |
| H | 200 | 13 421 | ±81 | 13 340~13 502 | ±138 | 13 283~13 559 |
| J | JX | G | -25 | -1 239 | ±62 | -1 177~-1 301 | ±123 | -1 116~-1 362 |
| G | 100 | 5 269 | ±62 | 5 207~5 331 | ±123 | 5 146~5 392 |
| H | -25 | -1 239 | ±62 | - 177~-1 301 | ±123 | -1 116~-1 362 |
| H | 100 | 5 269 | ±62 | 5 207~5 331 | ±123 | 5 146~5 392 |
| H | 200 | 10 779 | ±62 | 10 717~10 841 | ±123 | 10 656~10 902 |
| T | TX | G | -25 | -940 | ±30 | -910~-970 | ±60 | -850~-1 000 |
| G | 100 | 4 279 | ±30 | 4 249~4 309 | ±60 | 4 189~4 339 |
| H | -25 | -940 | ±48 | -892~-988 | ±90 | -850~-1 030 |
| H | 100 | 4 279 | ±48 | 4231~4 327 | ±90 | 4 189~4 369 |
| H | 200 | | | | | |
Size range
Wire: 0.10 to 8.0 mm.
- Type T Temperature Range:
- Thermocouple grade wire, -454 to 700F (-270 to 370C)
- Extension wire, 32 to 392F (0 to 200C)
- Type T Accuracy (whichever is greater):
- Standard: +/- 1.0C or +/- .75%
- Special Limits of Error: +/- 0.5C or 0.4%
