Ceramaseal® Online Store
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at CeramTec North America
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Ceramaseal® Thermocouples
Ceramaseal® thermocouples are manufactured with thermocouple materials or compensating material and transmit the electromotive force (EMF) generated by the application of heat to the thermocouple bead through the wall of the chamber without introducing error.
External instrumentation can then evaluate the strength of the EMF that is proportional to the temperature at the thermocouple bead, thus yielding a temperature measurement. Ceramaseal® thermocouple feedthroughs from CeramTec provide the necessary electrical isolation and a hermetic seal. CeramTec uses compensating wires for refractory and noble metal thermocouples. The joints between the compensating material and the true thermocouple conductor material must be thermally shielded and not exceed 250°C.
Typical Construction of Ceramaseal® Thermocouples
(1) Contact, (2) Insulator, (3) Shims, (4) Cap, (5) Adapter, (6) Flange, (7) Spacer, (8) Conductor, (9) Contact
Ceramaseal® thermocouple feedthroughs use only inorganic materials. The insulators are made from high-purity, high-strength, low-loss alumina ceramics. Hardware metals include Kovar®, stainless steel, nickel, copper, nickel-iron alloys, cupro-nickel alloys and molybdenum. Conductor materials and contacts include Chromel®, Alumel®, Alloy 405, Alloy 426, Alloy 11, copper, Constantan® and iron. Alloy 11, copper, Alloy 405 and Alloy 426 are used as a compensation material in C, R and S feedthrough types.
ANSI Type | Thermocouples | Polarity | °C | EMK (mV) |
---|---|---|---|---|
*Not an ANSI symbol | ||||
T | Copper Constantann |
+ - |
-200 to 350 | -5,60 to 17,82 |
K | Chromel Alumel |
+ - |
-200 to 1.250 | -5,9 to 50,63 |
J | Iron Constantan |
+ - |
0 to 750 | 0 to 42,28 |
S | Platinum 10% Rhodium Platinum |
+ - |
0 to 1.450 | 0 to 14,97 |
R | Platinum 13% Rhodium Platinum |
+ - |
0 to 1.450 | 0 to 16,74 |
C* | Tungsten 5% Rhenium Tungsten 26% Rhenium |
+ - |
0 to 2.315 | 0 to 37,06 |
E | Chromel Constantan |
+ - |
-200 to 900 | -8,82 to 68,78 |
Braze materials used are silver, copper, silver-copper or gold-copper alloys. Metalization processes include both refractory-metal and active-metal metalizations, depending on the size, geometry and performance requirements for the seals. CeramTec uses advanced techniques and methods to control and monitor critical processes, including 100 percent helium leak testing and x-ray measurements for metalization control.
Standard installation mountings for Ceramaseal® thermocouples include:
Please click on the button “Contacts” to the right, to get a list with the personal and direct responsible contacts within the CeramTec Group.