Project Description
Thermocouples Extension and Compensating Alloys
Thermocouple Extension and Compensation Alloy Wire is to extend the hot electrode (cold end of the thermocouple), and connect with the display instrument to form a temperature measuring system. The operating temperature is -25-200℃.
HB SPECIAL ALLOY mainly produce KX, NX, EX, JX, TX, SC/RC, KCA, KCB and WRENC Extension and Compensation Alloy Wire for Thermocouples. They are used in all kinds of temperature measuring devices and cables, and have been widely used in nuclear power, petroleum, chemical industry, metallurgy, electric power and other fields.
Our Thermocouple Extension and Compensation Alloy Wire is produced according to GB/T 4990-2010 ‘Alloy Wires of Extension and Compensating Cables for Thermocouples’ and IEC 60584-3-2007 ‘Standard | Thermocouples – Part 3’.
EMF of Compensating Wire and the Tolerance
| Thermocouple Index No. | Extension and Compensating Wire Type | Usage Classification | Measuring Junction Temperature, ℃ | Standard EMF Value, μV | Precision Grade | General Level | ||
| Tolerance, μV | Thermal EMF Range, μV | Tolerance, μV | Thermal EMF Range, μV | |||||
| S or R | SC or RC | G | 100 | 646 | ±30 | 616-676 | ±60 | 586-706 |
| H | 100 | 646 | – | – | ±60 | 586-706 | ||
| 200 | 11441 | – | – | 1.381-1501 | ||||
| K | KX, KCA or KCB | G | -25 | -968 | ±40 | -924–1012 | ±80 | -1936 |
| 100 | 4096 | ±40 | 4052-4140 | 4008-4184 | ||||
| H | -25 | -968 | ±40 | -924–1012 | ±88 | -1936 | ||
| 100 | 4096 | 4052-4140 | 4008-4184 | |||||
| 200 | 8138 | 8094-8182 | 8050-8226 | |||||
| N | NX or NC | G | -25 | -646 | ±43 | -1292 | ±86 | -1292 |
| 100 | 2774 | 2731-2817 | 2688-2860 | |||||
| H | -25 | -646 | ±43 | -1293 | ±86 | -1292 | ||
| 100 | 2774 | 2731-2817 | 2688-2860 | |||||
| 200 | 59123 | 5870-5956 | 5827-5999 | |||||
| E | EX | G | -25 | -1432 | ±81 | -2864 | ±138 | -2864 |
| 100 | 6319 | 6238- 6400 | 6181-6 457 | |||||
| H | -25 | -1432 | ±81 | -2864 | ±138 | -2864 | ||
| 100 | 6319 | 6238-6400 | 6181-6457 | |||||
| 200 | 13421 | 13340-13502 | 13283-13559 | |||||
| J | JX | G | -25 | -1239 | ±62 | -2478 | ±123 | -2478 |
| 100 | 5269 | 5207-5331 | 5146-5392 | |||||
| H | -25 | -1239 | ±62 | -1478 | ±123 | -2478 | ||
| 100 | 5269 | 5207-5331 | 5146-5392 | |||||
| 200 | 10779 | ±62 | 10717-10841 | ±123 | 10656-10902±1℃ or ±1.5%t | |||
| T | TX | G | -25 | -940 | ±30 | -910 970 | ±60 | -1850 |
| 100 | 4279 | 4249-4309 | 4189-4339 | |||||
| H | -25 | -940 | ±48 | -1880 | ±60 | -1880 | ||
| 100 | 4279 | 4231-4327 | 4189-4369 | |||||
| 200 | 9288 | 9240- | 9198-9378 | |||||
| Compensation Wire Type | Reciprocating Resistance at ℃ Ω/m (less than) | ||||
| 0.2mm2 | 0.5mm2 | 1.0mm2 | 1.5mm2 | 2.5mm2 | |
| SC or RC | 0.25 | 0.1 | 0.05 | 0.03 | 0.02 |
| KCA | 3.5 | 1.4 | 0.7 | 0.47 | 0.28 |
| KCB | 2.6 | 1.04 | 0.52 | 0.35 | 0.21 |
| KX | 5.5 | 2.2 | 1.1 | 0.73 | 0.44 |
| EX | 6.25 | 2.5 | 1.25 | 0.83 | 0.5 |
| JX | 3.25 | 1.3 | 0.65 | 0.43 | 0.26 |
| TX | 2.6 | 1.04 | 0.52 | 0.35 | 0.21 |
| NC | 3.75 | 1.5 | 0.75 | 0.5 | 0.3 |
| NX | 7.15 | 2.86 | 1.43 | 0.95 | 0.57 |