atmospheres. Must be protected from sulphurous atmospheres. Very accurate at high
temperatures. Virtually the same E.M.F. and range as Type K.
(TYPE J) Iron-Constantan thermocouples are suitable for use in vacuum, oxidizing, reducing
or inert atmospheres. Suitable for measuring temperatures up to 760°C for largest wire size.
(TYPE K) Chromel-Alumel thermocouples are suitable for continuous use in oxidizing or inert
atmospheres up to 1260°C for largest wire size. Because their oxidation resistance characteristics
are better than those of other base metal thermocouples, they find widest use at temperatures
above 538°C.
(TYPE E) Chromel-Constantan thermocouples are suitable for use up to 781°C in oxidizing or inert
atmospheres for largest wire size. Type E thermocouples develop the highest E.M.F per degree
of all commonly used thermocouples.
(TYPE T) Copper-Constantan thermocouples are suitable for sub-zero temperatures with an upper
temperature limit of 371°C and can be used in vacuum, oxidizing, reducing or inert atmospheres.
(TYPE R) Platinum 13% Rhodium - Platinum thermocouples are suitable for continuous use in
oxidizing or inert atmospheres at temperatures up to 1482°C.
(TYPE S) Platinum 10% Rhodium - Platinum thermocouples are suitable for continuous use in
oxidizing or inert atmospheres at temperatures up to 1482°C.
(TYPE B) Platinum 30% Rhodium - Platinum 6% Rhodium thermocouples are suitable for continuous use in oxidizing or inert atmospheres and short-term use in vacuum atmospheres at temperatures up to 1705°C.
(TYPE W) Tungsten - Rhenium Alloy thermocouples are used to measure temperatures up to 2760°C.
These thermocouples have inherently poor oxidation resistance and should be used in vacuum,
hydrogen or inert atmospheres.
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