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DITWDuplex Insulated Thermocouple Wire

Duplex Insulated Thermocouple Wire

For easier use of thermocouples, Ninomiya Electric Wire sheathes thermocouple component wires and provides them as lightweight, flexible, easy-to-use duplex insulated thermocouple wires. If a closed circuit consisting of two different wires made of different materials has differing temperatures at the joints at both ends, then the Seebeck effect generates a thermal electromotive force in the circuit, causing a current to flow through it. A thermocouple refers to a combination of two different wires (thermocouple component wires) with one end electrically connected for the purpose of generating the said thermal electromotive force. Thermocouple component wires provide the long parts from which thermocouples are made; they are cut to desired lengths and electrically connected at one end. The duplex insulated thermocouple wire refers to thermocouple component wires sheathed with vinyl, silicone rubber, a fluorine resin, glass yarn, silica fiber, ceramic fiber, or a similar insulating material.

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Supplementary Information

Types/Identifications/Conductor Materials of Duplex Insulated Thermocouple Wire

Ninomiya’s duplex insulated thermocouple wire are insulator-coated products using the thermocouple wires, which comply with JIS C 1602-2015 and ASTM E 230 (formerly ANSI MC 96.1), as their conductors. Regarding insulators and sheathes, we have established the Ninomiya Electric Wire's Standards using the extension and compensating cables for thermocouples standards (JIS C 1610-2015) as a reference, so that our customers can use them for a wide range of applications.

Thermocouple Type Conductor Material JIS C1602-2015 ASTM E230(旧 ANSI MC 96.1)
+ - Color of Thermocouple Wire Tolerance Color of Thermocouple Wire Tolerance
JIS C1610-2012 (1995 classification 1) JIS C1610-1995 Classification 2 Class Measured Temperature Range Tolerance Class Measured Temperature Range Tolerance
N Nickel-chromium alloy Nickel-silicon alloy N J1 +桃 -白 桃 N J1 +桃 -白 桃 - Class 1 −40°C and higher, lower than +375°C ±1.5℃ N ASTM +橙 -赤 茶 N ASTM +赤 -橙 茶 Sp：Special 0～1260℃ ±1.1℃
or
±0.4%
375°C and higher, lower than 1000°C ±0.004･| t|

Class 2

 −40°C and higher, lower than +333°C ±2.5℃ St：Standard ±2.2℃
or
±0.75%
333°C and higher, lower than 1200°C ±0.0075･| t|
K Nickel-chromium alloy Nickel alloy金 K J1 +緑 -白 緑 K J1 +緑 -白 緑 K J2 +赤 -白 青 K J2 +赤 -白 青 Class 1 −40°C and higher, lower than +375°C ±1.5℃ KX ASTM +黄 -赤 茶 KX ASTM +赤 -黄 茶 Sp：Special 0～1260℃ ±1.1℃
or
±0.4%
375°C and higher, lower than 800°C ±0.004･| t|

Class 2

 −40°C and higher, lower than +333°C ±2.5℃ St：Standard ±2.2℃
or
±0.75%
333°C and higher, lower than 1200°C ±0.0075･| t|
E Nickel-chromium alloy Copper-nickel alloy E J1 +紫 -白 紫 E J1 +紫 -白 紫 E J2 +赤 -白 紫 E J2 +赤 -白 紫 Class 1 −40°C and higher, lower than +375°C ±1.5℃ EX ASTM +紫 -赤 茶 EX ASTM +赤 -紫 茶 Sp：Special 0～870℃ ±1.0℃
or
±0.4%
375°C and higher, lower than 800°C ±0.004･| t|

Class 2

 −40°C and higher, lower than +333°C ±2.5℃ St：Standard ±1.7℃
or
±0.75%
333°C and higher, lower than 900°C ±0.0075･| t|
J 鉄 Copper nickel alloy J J1 +黒 -白 黒 J J1 +黒 -白 黒 J J2 +赤 -白 黄 J J2 +赤 -白 黄 Class 1 −40°C and higher, lower than +375°C ±1.5℃ J ASTM +白 -赤 茶 J ASTM +赤 -白 茶 Sp：Special 0～760℃ ±1.1℃
or
±0.4%
375°C and higher, lower than 750°C ±0.004･| t|

Class 2

 −40°C and higher, lower than +333°C ±2.5℃ St：Standard ±2.2℃
or
±0.75%
333℃以上750℃未満 ±0.0075･| t|
T 銅 Copper nickel alloy T J1 +茶 -白 茶 T J1 +茶 -白 茶 T J2 +赤 -白 茶 T J2 +赤 -白 茶 Class 1 −40°C and higher, lower than +125°C ±0.5℃ T ASTM +青 -赤 茶 T ASTM +赤 -青 茶 Sp：Special 0～370℃ ±0.5℃
or
±0.4%
125°C and higher, lower than 350°C ±0.004･| t|

Class 2

 −40°C and higher, lower than +133°C ±1.0℃ St：Standard ±1.0℃
or
±0.75%
133°C and higher, lower than 350°C ±0.0075･| t|

* The term tolerance refers to the maximum allowable value of the thermo-electromotive force converted using the standard thermo-electromotive force table minus the temperature of the measurement contact.
* t = Measured temperature (°C)
* For glass-insulated and ceramic-insulated products, identification by streaks of each color is set as standard.
* Because K-SLGB product (P.9) uses polyimide paint (brown), identification with black streaks is set as standard.
* The deterioration status (i.e. life) of thermocouple wires and Extension and Compensating Cables for Thermocouples varies depending on the usage environment and conductor size. We recommend that you calibrate and replace such products on a regular basis.

Conductor resistance/Electromotive force/Allowable operating temperature

List of reciprocating conductor resistances of thermocouple wires on a size-by-size basis (reference values at 20°C/standard)

(Ω/m)

Type
Conductor diameter (mm)		 N K E J T
0.05 - 494 - - -
0.1 158 124 150 - 64.6
0.2 39.5 30.9 37.6 19.4 16.1
0.32 15.4 12.1 14.7 7.58 6.30
0.65 3.74 2.92 3.56 1.84 1.53
1.0 1.58 1.24 1.50 0.777 0.646

List of electromotive forces of thermocouple wires

(μV)

Temperature (℃)
Type		 0 100 200 400 600 800 1000
N 0 2774 5913 12974 20613 28455 36256
K 0 4096 8138 16397 24905 33275 41276
E 0 6319 13421 28946 - - -
J 0 5269 10779 21848 - - -
T 0 4279 9288 - - - -

Normal-use temperature and overheating temperature limits for conductors of thermocouple wire

Wire diameter (mm) N K E J T
0.05 Normal use (℃) - 100 - - -
Overheating (℃) - 200 - - -
0.1 Normal use (℃) 300 200 100 - 100
Overheating (℃) 400 300 150 - 150
0.2 Normal use (℃) 400 300 200 200 100
Overheating (℃) 500 400 300 300 150
0.32 Normal use (℃) 500 400 200 200 200
Overheating (℃) 600 500 300 300 250
0.65 Normal use (℃) 850 650 450 400 200
Overheating (℃) 900 850 500 500 250
1.0 Normal use (℃) 950 750 500 450 250
Overheating (℃) 1000 950 550 550 300

*The figures in the cells with the yellow background are from JIS C1602-1995 (Explanation Chart 3) (10000∙250).
The other figures are reference values.
*The normal-use temperature limit refers to the upper limit of the temperatures at which each product can be used in air.
*The overheating temperature limit refers to the upper limit of the temperatures at which each product can be exceptionally used for a short time for unavoidable reasons.