![]() Nicrosil and Nisil are registered trademarks of Amax Specialty Metals Corp.Solution by area Acoustics Data Recording Flight/Space Testing Monitoring NVH Testing Electrical Power Testing Rotating Machinery Structural Dynamics Vehicle Testing Vibration Analysis Looking for exact specifications? See our catalog.Ĭhromel and Alumel are registered trademarks of Hoskins Mfg. Looking for thermocouple assemblies by style? See our Thermocouples page. It is also less susceptible to grain growth and drift. The type B thermocouple is very similar to type R and type S, but the output is lower. The type R thermocouple is used in industry whereas type S is used in the laboratory.Īlloy Combination: Platinum (6% Rhodium)/Platinum (30% Rhodium) Negative calibration drift can beĬaused by Rhodium diffusion to the pure leg as well as from Rhodium volatilization. Continued high temperature usage causes grain growth, which can lead to mechanical failure. They are both recommended for high temperature applications and must be protected with a non-metallic Type S and Type R thermocouples are obviously very similar. Type R Alloy Combination: Platinum/Platinum (13% Rhodium) Type S Alloy Combination: Platinum/Platinum (10% Rhodium) Type S Thermocouple & Type R Thermocouple Type N thermocouples can be used in applications where Type K elements have a shorter life and stability problems due to oxidation and the development of 'green rot'. This type has the highest thermoelectricĪlloy Combination: Nicrosil®/Nisil® Temp. Sub-zero limits of error are not established. Type E thermocouples are recommended for continuously oxidizing or inert atmospheres. See our catalog for Limits of Error published for sub-zero temperature ranges.Īlloy Combination: Chromel®/Constantan Temp. They are not subject to corrosion in moist atmospheres. ![]() Type T thermocouples can be used in oxidizing, reducing, or inert atmospheres as well as vacuum conditions. Īlloy Combination: Copper/Constantan Temp. Bare elements should not be exposed to sulphurous atmospheres above 538 ☌. Heavy gauge wire is recommended for high temperature applications. Iron oxidizes rapidly above 538 ☌, so only The type J thermocouple is suitable for vacuum, reducing, or inert atmospheres, oxidizing atmosphere with reduced life. Ventilation or inert-sealing of the protection tube can prevent these issues.Īlloy Combination: Iron/Constantan Temp. Preferential oxidation of chromium in positive leg at certain low oxygen concentrations causes 'green rot' and large negative calibration drifts most They are subject to failure ifĮxposed to sulphur. Type K thermocouples are recommended for continuous oxidizing or neutral atmospheres and are mostly used above 538 ☌. ![]() ![]() Type K ThermocoupleĪlloy Combination: Chromel®/Alumel® Temp. Popular generic and trade names for the most common thermocouple type wire combinations follow, as well as typical applications and limitations for each. Selection of the proper thermocouple type for a particular application is determined by temperatureĮxpectations and by the environment in which the sensor will be placed. ![]() Thermocouple positive and negative leg wires define the type of thermocouple. Thermocouple Types: Type J, Type K, Type N, Type T, Type E, Type R, Type S, Type B, Type CĪ thermocouple consists of a welded 'hot' junction between two dissimilar metals - usually wires - and a reference junction at the opposite end. ![]()
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