What does \"preferred type most linear\" mean for thermocouple types?
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Regarding the selection of thermocouples: Chromel Alumel Type K is suitable for temperatures from 0 to 1250 ℃ (it’s the preferred type as it provides the most linear response). For temperatures in the range of 0 to 1250 ℃, the K-type thermocouple made of nickel-chromium and nickel-aluminum alloys is also used (I’m not sure what exactly is meant by “preferred type with the most linear response”). I’d appreciate everyone’s advice! Thank you! This post was last edited by sherry_0_0 on 2009-2-19 16:28.]
Preferred type: most linear – the preferred option for optimal linearity. The linearity of the thermoelectromotive force and temperature is an important factor in evaluating thermocouples.
Chromel-alumel (type-K) can be used in oxidizing atmospheres. It is the most linear thermocouple in general use. Type-N (Nicrosil versus Nisil) is a relatively new base-metal thermocouple. It provides stability as good as the more expensive noble metal thermocouples up to about 2200 °F (1204 °C), where type-K starts to become unstable. The stability of type-N thermocouples is due to increased percentages of chromium, silicon and magnesium.................. One word is missing; it should be “preferred type” – type-K is the preferred type among the most linear thermocouples.