N type thermocouple


silicon nickel chrome - nickel silicon magnesium thermocouple ( N type thermocouple)


English entry name: nickel - 铬- 硅合金/ nickelchromium -


the positive (of the thermocouple NP） 13 for the nominal value. 7% ~ 14. 7% of chromium and 1. 2% ~ 1. 6% of the silicon


and < 0. 01% of the magnesium and nickel ( Yu) Alloy, the cathode ( NN） For the nominal value 4. 2% ~ 4. 6% of the silicon and 0. 5% ~ 1. 5%


magnesium, and < 0. 02% of chromium and nickel ( Yu) Alloy.


2 product introduction


N type thermocouple for inexpensive metal thermocouple, thermocouple is a new international standard of *, is successfully developed by the Australian defence laboratory, in the early 70 s it overcome the K type thermocouple two important faults: K type thermocouple between 300 ~ 500 ℃ due to the lattice short-range order of nickel-chromium alloy thermoelectric emfs caused by unstable; At about 800 ℃ caused by nickel chrome preferential oxidation thermoelectric emfs instability.


N type thermocouple has advantages of good linearity, thermoelectric emfs is larger, higher sensitivity, stability and good uniformity, oxidation resistance is strong, cheap, is not affected by short-range ordering etc, and its comprehensive performance is better than that of K type thermocouple, thermocouple is a kind of very promising.


N type thermocouple cannot be directly used at high temperature, reducing or reduction, oxidation atmosphere and vacuum alternately, is not recommended for people with weak oxidizing atmosphere.


3 characteristics of


1, under 1300 ℃ temperature anti-oxidation ability;


2, short and long term stability thermal cycling good reproducibility;


3, radiation resistance and good low temperature resistance;


4, within the scope of the 400 ~ 1300 ℃, the thermoelectric properties of N type thermocouple linear better than K type I;


5, within the scope of the low temperature ( - 200～400℃) The nonlinear error is bigger, at the same time, are difficult to machine materials hard.


this series of products of protecting tube with high temperature oxidation resistance of high temperature alloy tube material, lining of ceramic tube, pipe structure, thermal components are assembled, sheathed type and ceramic tube 3 kinds, has the high resistance to high temperature oxidation performance, is mainly used in the aluminum metallurgical industry anode baking furnace temperature measurement.


- the main technical index






type no.




indexing,




tolerance values




measurement range ( ℃)




thermal element form




tau zero thermal response time. 5 ( s)






wrny - 133年□




n




±0。
or
4% t + 0. 75% t




0 ~ 1300




ordinary
prefabricated




Φ 12 tube < 90
Φ below 20 tube < 150
Φ below 30 tube < 180






WRKY - 133年□




k






wrnyk - 133 -




N




armor type




< 60 Φ 12 tube
Φ below 20 tube < 120
Φ below 30 tube < 150






WRKYK - 133 -




K






- specifications ( mm)






type no.




indexing,




the measuring end form




protection tube






materials




diameter d




length L






WRNY - 133 -




N





multiple tube type prefabricated




OR1300 3 yc52






12 ~ 30







1250 1000 1500 1750

2000






WRKY - 133年□




k






wrnyk - 133 -




N





multiple tube type sheathed type




GH3030
GH3039 601







WRKYK - 133□




K