THERMOCOUPLES
Frequently you will have a choice of thermocouple
types. Make your selection carefully, based on factors such as operating temperature,
accuracy and EMF output required, and the atmosphere in which you plan to install the
thermocouple. Refer to the tables and charts listed below.
Legend
Type E
Type J
Type T
Type K
Type R
(platinum 13% Rhodium - Platinum)
Type S
(Platinum 10% Rhodium - Platinum)
Type B
Platinum 30% Rhodium
Platinum 6% Rhodium
Tentative Curves:
A Tungsten 5% Rhenium - Tungsten 26% Rhenium C Tungsten - Tungsten 26% Rhenium
Type T Copper-Constantan-High resistance to corrosion from atmospheric moisture or moisture condensation. Can be used in either oxidizing or reducing atmosphere.
Type E (originally *Chromel -
Constantan)- Primarily for oxidizing atmospheres. Does not
corrode at sub-zero temperature. *Trademark, Hoskins Manufacturing Co.
Type K (originally *Chromel - Alumel)- Recommended between 583C (1000F)in oxidizing atmospheres. Type K thermocouple wire is manufactured under such trademarks as *Chromel-Alumel (Hoskins Manufacturing Co.), Tophel-Nial (W.B. Driver Co.), T2-T2(Driver-Harris C.), ETC.
Type J Iron-Constantan- Suitable where free oxygen is deficient. As oxidation of the iron conductor increases rapidly above 583C (1000F) of the instrument with which it will be used. This information can usually be found on the face of the instrument.
Type R and S Platinum Rhodium-Platinum; 13% or 10%
Type B Platinum 30% Rhodium-Platinum 6% Rhodium. Recommended for use in oxidizing atmospheres. Easily contaminated in any other atmosphere, so caution should be used in these cases.
Tungsten-Tungsten 26% Rhenium
Tungsten 5% Rhenium-Tungsten 26%
Rhenium. Recommended for reducing inert atmospheres or
vacuum. CAUTION: DO NOT use in the presence of FREE OXYGEN.
To order, call JIMNEL enterprises now: 1-800-218-6225
