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Type J Thermocouple Compensation Wire 2 Conductors Thermocouple Cable Wire
J-type thermocouple compensation wire is a special wire used to
extend the J-type thermocouple measurement loop and compensate for
the cold end temperature change. It is made of materials such as
iron-copper-nickel alloy, has good thermoelectric performance and
stability, and can maintain the same thermoelectric electromotive
force characteristics as the J-type thermocouple within a certain
temperature range (usually -25℃ to 70℃ or higher, depending on the
insulation material).
Depending on the insulation and sheath materials, J-type
compensation wires are available in a variety of models, such as
polyvinyl chloride insulated polyvinyl chloride sheath (JX-GA-VV),
fluoroplastic insulated sheath (JX-HA-FF), cross-linked
polyethylene insulated polyvinyl chloride sheath (JX-GA-YJV), etc.
In addition, shielded and flame-retardant wires are also available
to meet the anti-interference and fire prevention requirements in
different environments.
J-type compensation wires are widely used in industrial temperature
measurement fields, such as electricity, metallurgy, chemical
industry, etc., which can effectively improve the accuracy and
reliability of the temperature measurement system. When using, pay
attention to matching with the J-type thermocouple and ensure that
the positive and negative poles of the wire are connected
correctly.
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) |
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 |
|
The iron-copper-nickel thermocouple (J-type thermocouple) is also
called the iron-constantan thermocouple. Its positive electrode
(JP) has a nominal chemical composition of pure iron, and its
negative electrode (JN) is a copper-nickel alloy, often vaguely
called constantan. Its nominal chemical composition is 55% copper
and 45% nickel, as well as a small but very important amount of
cobalt, iron, manganese and other elements. Although it is called
constantan, it is different from the constantan of
nickel-chromium-constantan and copper-constantan, so it cannot be
replaced by EN or TN.
The iron-constantan thermocouple covers a measurement temperature
range of -210~1200°C, but the commonly used temperature range is
0-750°C.