N type thermocouple what are the advantages and disadvantages compared with k type thermocouple _ instrument
by:JVTIA
2020-10-30
N type thermocouple n type thermocouple have the advantages of high temperature oxidation resistance is strong, long term stability.
K type thermocouple nickel chromium anode preferential oxidation caused by cr, si element in the alloy composition is uneven and thermoelectric drift, cr, si content in n type thermocouple, nickel-chromium alloy oxidation patterns by internal oxidation into external oxidation, the oxidation reaction on the surface only;
Short-term thermal cycling stability at low temperature, and inhibit the magnetic change;
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Radiation resistant ability.
N type thermocouple is cancelled easy disintegration of k type thermocouple elements mn, co, further strengthen ability to resist neutron irradiation;
, within the range of 400 ~ 1300 ℃, the thermoelectric properties of n type thermocouple linear than k type.
N type thermocouple material is harder than k type thermocouple, the more difficult processing;
The price is relatively expensive.
The thermal expansion coefficient of n type thermocouple 15% lower than stainless steel, so the outer casing of n type thermocouple shall adopt the nicrsi/nisi alloy;
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200 ~ 400 ℃ within the scope of nonlinear error is bigger.
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