Temperature Instrumentation for Research and Industry

Products

Sensors - Marlox Thermocouples - Thermocouple Type

Type T (Copper vs Constantan)
Type T is used for service in oxidizing, inert or reducing atmospheres or in vacuum. It is highly resistant to corrosion from atmospheric moisture and condensation and exhibits high stability at low temperatures; it is the only type with limits of error guaranteed for cryogenic temperatures.
Type J (Iron vs Constantan)
Type J is used protected or unprotected in vacuum, oxidizing, inert or reducing atmospheres. Iron element oxidizes rapidly at temperatures exceeding 1000°F, and therefore heavier gauge wire is recommended for longer life at these temperatures.
Type E (ChromelTM vs Constantan)
Type E may be used protected or unprotected in oxidizing, inert or dry reducing atmospheres, or for short periods of time under vacuum. Must be protected from sulfurous and marginally oxidizing atmospheres. Produces the highest EMF per degree of any standardized metallic thermocouple.
Type K (ChromelTM vs Alumel)
Type K is used protected or exposed to oxidizing, inert or dry reducing atmospheres. Exposure to vacuum is limited to short time periods. Must be protected from sulfurous and marginally oxidizing atmospheres. Reliable and accurate at high temperatures. (TM - HOSKINS MFG. CO.)
Type N (NICROSIL vs NISIL)
Type N is used protected or exposed to oxidizing, inert or dry reducing atmospheres. Exposure to vacuum is limited to short time periods. Must be protected from sulfurous atmospheres.
Thermocouple Wire Alloys Temperature Range (°F) Order Code Standard Grade Initial Calibration Tolerance
Standard Grade Special* Grade
Copper (+) vs.
Constantan (-)		 -32 to +270
+270 to +660		 1T ±1.8°F
±0.75%		 ±0.9°F
±0.4%
Iron (+) vs.
Constantan (-)		 32 to 530
530 to 1400		 1J ±4.0°F
±0.75%		 ±2.0°F
±0.4%
ChromelTM (+) vs.
Constantan (-)		 32 to 600
600 to 1600		 1E ±3.0°F
±0.5%		 ±4.0°F
±0.4%
ChromelTM (+) vs.
Alumel (-)		 32 to 530
530 to 2300		 1K ±4.0°F
±0.75%		 ±2.0°F
±0.4%
Nicrosil (+) vs.
Nisil (-)		 32 to 530
530 to 2300		 1N ±4.0°F
±0.75%		 ±2.0°F
±0.4%
*ACCURACY OF MARLOX THERMOCOUPLES

Marlin products are manufactured to specifications in conformance with Initial Calibration Tolerance of ANSI/ASTM E230. Standard grade wire is used in manufacturing all Marlin thermocouples for temperature above 32°F; special grade thermocouples for use at sub-zero temperatures, and thermocouples with certified traceable calibrations are available upon request. To order a special grade Initial Calibration Tolerance Thermocouple use a designation; e.g.,2T,2J,2E,2K,2N.

For more information regarding Marlox Thermocouples,
Please consult your Marlin catalog.