Type K / J / E / N / T / R / S / B Thermocouple Extension Cable
with PVC Sheath for -20~100℃ Temperature Range
Thermocouple compensation wire temperature measurement principle
The function of compensating wires for thermocouples is to extend
the thermoelectric electrode, that is, move the cold end of the
thermocouple, and connect it with the display instrument to form a
temperature measurement system. The product is mainly used in
various temperature measurement devices and has been widely used in
departments such as petroleum, chemical, metallurgy, and power.
Generally speaking, thermocouples may be several tens of meters
away from the thermometer, and the temperature at the cold end
(outlet) of the thermocouple is different from the ambient
temperature of the thermometer (even up to several tens of
degrees).
If ordinary copper wires are used, according to the principle of
thermocouples, the junction will generate thermoelectric potential,
which will result in measurement errors.
The voltage drop problem of long-distance transmission wires is due
to the high input impedance of the thermometer, the small
transmission current (micro A level) generated by the thermocouple
(millivolt level), and the small voltage drop loss on the wire,
which is generally within the error range. So there is a
thermocouple transmitter that inputs thermocouple signals and
outputs 4-20mA, which allows for long-distance transmission without
compensating for wires.
If a compensating wire is used (which must match the thermocouple
graduation number), the metal material used can generate the
smallest possible thermoelectric potential at the wiring point and
minimize temperature measurement errors as much as possible. That
is to say, move the cold end of the thermocouple to the
thermometer.
Equipped with thermoelectric Even graduation number | common(G) | heat resistant(H) |
Common | Precision(S) | Common | Precision(S) |
S | SC-G | SC-GS | SC-H | -- |
N | NC-G | NC-GS | NC-H | NC-HS |
K | NC-G | NC-GS | NC-H | -- |
KC2-G | KG2-GS | KC2-H | KC2-HS |
KX-G | KX-GS | KX-H | KX-HS |
E | EX-G | EX-GS | EX-H | EX-HS |
J | JX-G | JX-GS | JX-H | JX-HS |
T | TX-G | TX-GS | TX-H | TX-HS |
| 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 |
Working Temperature Range
| Diameter/mm | Long time Working temperature /ºC | Short period Working temperature /ºC |
| 0.3 | 700 | 800 |
| 0.5 | 800 | 900 |
| 0.8,1.0 | 900 | 1000 |
| 1.2,1.6 | 1000 | 1100 |
| 2.0,2.5 | 1100 | 1200 |
| 3.2 | 1200 | 1300 |
| 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 | | 200 | 1 1441 | - | - | 1.381~1 501 | | | | | | | K | KX,KCA | G | -25 | -968 | ±40 | -924~-1 012 | ±80 | -880~-1 056 | | or KCB | 100 | 4 096 | 4 052~4 140 | 4 008~4 184 | | H | -25 | -968 | ±40 | -924~-1 012 | ±88 | -880~-1 056 | | 100 | 4 096 | 4 052~4 140 | 4 008~4 184 | | 200 | 8 138 | 8 094~8 182 | 8 050~8 226 | | N | NX or NC | G | -25 | -646 | ±43 | -603~-689 | ±86 | -560~-732 | | 100 | 2 774 | 2 731~2 817 | 2 688~2 860 | | H | -25 | -646 | ±43 | -603~-690 | ±86 | -560~-732 | | 100 | 2 774 | 2 731~2 817 | 2 688~2 860 | | 200 | 5 913 | 5 870~5 956 | 5 827~5 999 | | E | EX | G | -25 | -1 432 | ±81 | -1 351~-1 513 | ±138 | -1 294~-1 570 | | 100 | 6 319 | 6 238~ 6400 | 6 181~6 457 | | H | -25 | -1 432 | ±81 | -1 351~- 1513 | ±138 | -1 294~-1 570 | | 100 | 6 319 | 6 238~6 400 | 6 181~6 457 | | 200 | 13 421 | 13 340~13 502 | 13 283~13 559 | | J | JX | G | -25 | -1 239 | ±62 | -1 177~-1 301 | ±123 | -1 116~-1 362 | | 100 | 5 269 | 5 207~5 331 | 5 146~5 392 | | H | -25 | -1 239 | ±62 | - 177~-1 301 | ±123 | -1 116~-1 362 | | 100 | 5 269 | 5 207~5 331 | 5 146~5 392 | | 200 | 10 779 | 10 717~10 841 | 10 656~10 902 | | T | TX | G | -25 | -940 | ±30 | -910~-970 | ±60 | -850~-1 000 | | 100 | 4 279 | 4 249~4 309 | 4 189~4 339 | | H | -25 | -940 | ±48 | -892~-988 | ±90 | -850~-1 030 | | 100 | 4 279 | 4231~4 327 | 4 189~4 369 | | 200 | | | |
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