National High Temperature Products Tools

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Thermocouple Wire

Type	Temperature Range (C)	Relevant Information
Type	Temperature Range (C)	Relevant Information
B	800 up to 1700	Used in Inert or Oxidizing Atmospheres. Be aware of the possibility of contamination.
C (W5)	0 up to 2200	Used in Inert, Vacuum or Hydrogen Atmospheres. Not routinely used below 750 C. Do not use in Oxidizing Atmospheres
E	-200 up to 900	Used in Inert or Oxidizing Atmospheres with limited use in Vacuum Atmospheres. The EMF change is the highest per degree.
J	0 up to 750	Used in Reducing and Inert Atmospheres with limited usage in Oxidizing Atmospheres at Higher temperatures.
K	-200 up to 1250	Used in clean Inert or Oxidizing Atmospheres with limited usage in Reducing or Vacuum Atmospheres. This calibration is the most popular.
N	0 up to 1250	Excellent option to type K, because of its stability at higher temperatures.
R or S	0 up to 1450	Used in Oxidizing or Inert Atmospheres. Be aware of the possibility of contamination.

Sheath Materials

Type	Recommended Temperature (C)	Operational Atmospheres
		(I) - Inert, (O) - Oxidizing, (R) - Reducing (V) - Vacuum
Alumina	up to 1900	I, O, R, V
Boron Nitride	up to 2000	I, V
Graphite	up to 3000	I, V
Hastelloy X	up to 1204	I, O, V
Inconel 600	up to 1149	I, O
Inconel 601	up to 1149	I, O
Inconel 601 GC	up to 1204	I, O
Molybdenum	up to 2204	I, R, V
Platinum	up to 1677	I, O, V
Platinum 10% Rh	up to 1760	I, O, V
Platinum 20% Rh	up to 1805	I, O, V
Silicon Nitride	up to 1750	I, V
Silicon Carbide	up to 2200	I, V
SS 304	up to 899	I, O, V
SS 310	up to 1149	I, O, V
SS 316	up to 927	I, O, V
Tantalum	up to 2483	I, V
Tungsten	up to 3000	I, R, V


Insulator Materials


Type	Recommended Temperature (C)	Operational Atmospheres
		(I) - Inert, (O) - Oxidizing, (R) - Reducing (V) - Vacuum
Magnesium Oxide (MgO)	up to 1370	V
Alumina	up to 1900	I, O, V
Hafnia	up to 2400	I, O, V
Boron Nitride	up to 2000	I, V