Products Description
NiCr-NiSi(Type K) thermocouple wire
NiCr-NiSi (Type K) thermocouple finds the widest use in all base metal thermocouple, at temperature above 500C.The main chemical composition of positive leg NiCr (KP) are Ni≈90% and Cr≈10%; negative leg NiSi (KN) are Ni≈97% and Cr≈3%. The operating temperature range is -200^ 1300ºC (for short term) and 0~ 1100ºC( for long term) .
Type K thermocouple 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 monox ide atmosphere
NiCr-CuNi (Constantan) thermocouple wire (Type E)
NiCr- CuNi thermocouple (type E) is also named NiCr- Constantan thermocouple. The main chemical composition of positive leg NiCr (EP) is Ni: Cr≈90:10; negative leg Constantan (EN) is Cu: Ni≈55%: 45%.Although EN,TN, JN are all called Constantan, EN and TN don not give the same EMF output curve as JN. EN and TN are able to interchange but they are not interchangeable with JN. The operating temperature range of type E thermocouple is-200 -900ºC.
Type E thermocouple has the largest EMF output and highest sensitivity, so it is ideal for measuring small temperature change. It also has good stability in the low temperature range up to 300C,and good property of anti corrosion in humidity atmosphere. It is recommended for oxidizing or inert atmospheres,but cannot be used directly in reducing atmosphere and atmosphere with sulphur gases.
Fe- CuNi(Constantan) thermocouple (Type J)
Fe-CuNi thermocouple (type J) is also named Fe- Constantan thermocouple. The positive leg Fe(JP) is made by pure lron, and the main chemical composition of negative leg Constantan UN) is Cu: Ni≈55%: 45%. Although they are all calld Constantan, JN does not give the same EMF output curve as EN and TN, it cannot be instead by other Constantan.
The operating temperature range of type J thermocouple is -210~1200ºC, but it is usually used in the temperature range 0~750C due to embrittlement of lron.
Type J thermocouple has good resistance to oxidation and high EMF output against Platinum 67, with good temperature accuracy, sensitivity and stbility. It is recommended for vacuum, oxidizing, reducing or inert atmospheres, but it can not be used in sulphurous atmosphere above 500°C.
Cu- CuNi (Constantan) thermocouple (Type T)
Cu-0uNi thermocouple (type T) is also named Cur Constantan thermocouple. The positive leg Cu(TP) is made by pure Copper, and the main chemical composition of negative leg Constantan (TN) is Cu: Ni≈55%: 45% Although EN, TN, JN are all called Constantan, TN and EN don not give the same EMF output curve as JN.EN and TN are able to interchange but they are not interchangeable with JN. The operat ing temperature range of type T thermocouple is- 200 -350ºC,Due to the low resistance of oxidation that Copper has, it is not advisable to go beyond that range.
Type T thermocouple has good resistance to oxidation, high EXF output, with good temperature accuracy,sensitivity and stability. In the temperature range - -200 0C,it has better property, the year stability is less than±3μV .
Nicrsi-NisiMg (Type N) thermocouple
Nicrsi-NisiMg (Type N) thermocouple is the latest base metal thermocouple, developed to improve the drawbacks that type K thermocouple has. The main chemical composition of positive leg Nicrsi (NP) is Ni: Cr: Si≈84.4: 14.2: 1.4; negative 1eg NisiMg (NN) is Ni: Si: Mg≈95.5: 4.4: 0.1. Type N thermocouple also be used in the similar atmospheres that type K works, and the operating temperature range is -200~ 1300ºC.
Type N thermocouple improves the EMF drift and short term EMF change, compared to type K thermocouple,and has a longer life than type K thermocouple. Therefore, in the industries where temperature control and measurement are especially critical, type N thermocouple has more advantages than other thermocouple
Thermocouple temperature range and tolerance
| Name |
Grade |
operating temperature range(ºC) |
temperature range(ºC) |
Tolerance |
standard |
| long term |
short term |
| K |
l |
1200 |
1300 |
-40~1100 |
+1.5ºC or+0.4%t |
GB/T2614 |
| ll |
-40~1300 |
+2.5ºC or+0.75%t |
| E |
l |
750 |
900 |
-40~800 |
+1.5ºC or+0.4%t |
GB/T4993 |
| ll |
-40~900 |
+2.5ºC or+0.75%t |
| J |
l |
600 |
750 |
-40~750 |
+1.5ºC or+0.4%t |
GB/T4994 |
| ll |
-40~350 |
+2.5ºC or+0.75%t |
| T |
l |
300 |
350 |
-40~350 |
±0.5ºC or±0.4%t |
GB/T2903 |
| ll |
±1ºC or±0.75%t |
| lll |
-200~40 |
±1ºC or±1.5%t |
| N |
l |
1200 |
1300 |
-40~1100 |
+1.5ºC or+0.4%t |
GB/T17615 |
| ll |
-40~1300 |
+2.5ºC or+0.75%t |
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