Green-White PTFE insulated Type K thermocouple Wire 
Thermocouple wire allows temperatures to be measured electronically. A typical thermocouple construction consists of a pair of dissimilar metals that are electrically joined together at the sensing point and connected to a voltage measuring instrument at the other end. When one junction is hotter than the other, a thermal "electromotive" force (in millivolts) is produced that is roughly proportional to the difference in temperature between the hot and cold junctions.

NiCr-NiSi (Type K) thermocouple wire finds the widest use in all basemetal thermocouple, at temperature above 500 °C.
Type K thermocouple wire has strong resistance to oxidation than other base metal thermocouples. It has high EMF against Platinum 67, excellent temperature accuracy, sensitivity and stability, with a low cost. It is recommended for oxidizing or inert atmospheres, but cannot be used directly in the following cases:
(1) Alternatively oxidizing and reducing atmosphere.
(2) Atmosphere with sulphur gases.
(3) Long time in vacuum.
(4) Low oxidizing atmosphere such as hydrogen and carbon monoxide atmosphere.

Detailed Parameter 

Chemical Composition for thermocouple wire
Conductor Name	Polarity	Code	Nominal Chemical Composition /%
			Ni	Cr	Si
Ni-Cr	Positive	KP	90	10	--
Ni- Si	Negative	KN	97	--	3

 

Working Temperature of thermocouple wire
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

Application of thermocouple wire:
1. Heating - Gas burners for ovens
2. Cooling - Freezers
3. Engine protection - Temperatures and surface temperatures
4. High temperature control - Iron casting