Thermocouple Types

Thermocouple		Features
Type	Composition	Features
B	Pt-30Rh/ Pt-6Rh	Type B Thermocouplewhich combines a positive wire of a platinum-rhodium alloy containing 70% platinum and 30% rhodium with a negative wire of platinum rhodium containing 94% platinum and 6% rhodium.B typethermocouple probe is more resistant to heat and mechanical stress thantype Rthermocouple andwithstands 1800°C max. Other features are the same as those oftype R Thermocouple.
R	Pt-13Rh/Pt	Type Rthermocouple which combines a positive wire of platinum and rhodium alloy containing 87% platinum and 13%rhodium with a negative wire of pure platinum.Type R thermocouple sensor is highlyaccurate, excellent in heat resistance and stability,temperature sensor probe R type generally used in oxidizingatmospheres,R typethermocouple is not recommended for use in reducing atmosphere or where metal vapors arepresent.
S	Pt-10Rh/Pt	S typethermocouple which combines a positive wire of a platinum rhodium alloy containing 90% platinum and 10% rhodium with a negative wireof pure platinum.Other features oftype Sthermocouple probe are the same as those ofType Rthermocouple.
N	Ni-Cr-Si/Ni-Si	N typethermocouple is called Nicrosil (positive leg)/Nisil(negative leg) thermocouple, andtype N thermocouple composition and characteristics are very similar tothermocouple probe type k, it is an improved type of K typethermocouple and has more Si additive , higher heatresistance.
K	Ni-Cr/ Ni-Al	K typethermocouple which combines a positive wire of an alloyconsisting mainly of nickel and chromium with negative wire of an alloyconsisting mainly of nickel.K type temperature probe widely used for manyindustrial temperaturemeasurement applications is resistant to oxidizing atmosphere but not to reducingatmospheres.ThermocoupleK particularlyshould not be used in carbon monoxide, sulfurous acid gas or sulfur bearing hydrogen atmospheres.
E	Ni-Cr/Cu-Ni	E typethermocouple which combines a positive wire ofthermocouple K with anegative wire ofthermocouple J, Type Ethermocouple has a high thermal EMF and is suitable for use in oxidizingatmosphere.
J	Fe/Cu-Ni	J typethermocouple which combines a positive wire of iron is resistant in reducingatmosphere and is also resistant to hydrogen and carbon. HoweverJ thermocouple should not be used in atmosphere that will oxidize iron.Type Jthermocouple is relatively low in cost and often used for medium temperature range applications.
T	Cu/Cu-Ni	T typethermocouple which combines apositive wire of cooper with a negative wire of an alloy mainly of copper and nickel, High accuracy is obtained at under 300°C, andtype Tthermocouple is suitable for low temperature from -200°C~100°C, Tthermocouple probe is suitable for use in weakoxidizing and reducing atmosphere.