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Types of Thermocouples JIS C1602

Types		Features
Symbols	Configuration Materials	Features
B	Pt-30Rh/Pt-6Rh	They are the thermocouples in combination of a positive leg made of platinum (70%) rhodium (30%) alloy and a negative leg that is composed of platinum (94%) rhodium (6%) alloy. They have better heat-resistance and mechanical strength than type R thermocouples, and the heat-resistant temperature is up to 1,800℃.
R	Pt-13Rh/Pt	Thermocouples in combination of a positive leg made of platinum (87%) rhodium (13%) alloy and a negative leg that is composed of pure platinum. They generally have good accuracy with excellent heat resistance and stability in an oxidizing atmosphere. They have a tendency to be weak in a reducing atmosphere or against metal vapor.
S	Pt-10Rh/Pt	Thermocouples in combination of a positive leg made of platinum (90%) rhodium (10%) alloy and a negative leg that is composed of pure platinum.
N	Ni-Cr-Si/Ni-Si	They are called Nicrosil (positive leg) Nisil (negative leg), and their composition and characteristics are very similar to type K thermocouples. They are an improved version of type K thermocouples, and the added amount of Si is larger and the heat resistance is better.
K	Ni-Cr/Ni-AI	They are the thermocouples in combination of a positive leg made of alloy of mainly nickel and chrome and a negative leg that is composed of an alloy of mainly nickel. They are used the most frequently for industrial purposes, and they show great resistance in an oxidizing atmosphere; however, they are weak in a reducing atmosphere and cannot be used in the atmospheres characterized by carbon monoxide, sulfurous acid gas, hydrogen sulfide, etc.
E	Ni-Cr/Cu-Ni	They are the thermocouples in combination of a positive leg made of type K thermocouples and a negative leg that is composed of type J thermocouples. They have extremely large thermo-electromotive force for temperature and are suitable to be used in an oxidizing atmosphere.
J	Fe/Cu-Ni	They are the thermocouples in combination of a positive leg made of iron and a negative leg that is composed of an alloy of mainly copper and nickel. They are strong in a reducing atmosphere and robust for hydrogen and carbon. They cannot be used in an oxidizing atmosphere since iron si quickly oxidized. They are relatively cheap so that they are suitable for medium temperatures.
T	Cu/Cu-Ni	They are thermocouples in combination of a positive leg made of copper and a negative leg that is composed of an alloy of mainly copper and nickel. They show high accuracy at 300℃ or lower and are especially suitable for low temperatures of -200 to 100℃. They are also suitable for a weak oxidizing and reducing atmosphere.

List of Thermocouple Tolerance and Standards Applied by Each Country

S t a n d a r d sT y p e s	JIS C1602			IEC 60584-2		ASTM E230
S t a n d a r d sT y p e s	Temperature range	C l a s s	Tolerance ℃	C l a s s	Tolerance ℃	Temperature range	C l a s s	Tolerance ℃
B	600℃ or higher and lower than 1,700℃	2	±0.0025\|t\|	2	±0.0025\|t\|	870℃ or higher and lower than 1,700℃	STD.	±0.5％
	600℃ or higher and lower than 800℃	3	±4	3	±4
	800℃ or higher and lower than 1,700℃	3	±0.005\|t\|	3	±0.005\|t\|
R&S	0℃ or higher and lower than 1,100℃	1	±1	1	±1	0℃ or higher and lower than 1,450℃	STD.	±1.5or ±0.25％
	0℃ or higher and lower than 600℃	2	±1.5	2	±1.5		SP.	±0.6or ±0.1％
	600℃ or higher and lower than 1,600℃	2	±0.0025\|t\|	2	±0.0025\|t\|		SP.	±0.6or ±0.1％
N&K	-40℃ or higher and lower than +375℃	1	±1.5	1	±1.5	0℃ or higher and lower than +1,260℃	STD.	±2.2or ±0.75％
	+375℃ or higher and lower than +1,000℃	1	±0.004\|t\|	1	±0.004\|t\|		STD.	±2.2or ±0.75％
	-40℃ or higher and lower than +333℃	2	±2.5	2	±2.5		SP.	±1.1or ±0.4％
	+333℃ or higher and lower than +1,200℃	2	±0.0075\|t\|	2	±0.0075\|t\|		SP.	±1.1or ±0.4％
	-167℃ or higher and lower than +40℃	3	±2.5	3	±2.5	-200℃ or higher and lower than 0℃	STD.	±2.2or ±0.2％
	-200℃ or higher and lower than -167℃	3	±0.015\|t\|	3	±0.015\|t\|	-200℃ or higher and lower than 0℃	STD.	±2.2or ±0.2％
E	-40℃ or higher and lower than +375℃	1	±1.5	1	±1.5	0℃ or higher and lower than +870℃	STD.	±1.7or ±0.5％
	+375℃ or higher and lower than +800℃	1	±0.004\|t\|	1	±0.004\|t\|		STD.	±1.7or ±0.5％
	-40℃ or higher and lower than +333℃	2	±2.5	2	±2.5		SP.	±1or ±0.4％
	+333℃ or higher and lower than +900℃	2	±0.0075\|t\|	2	±0.0075\|t\|		SP.	±1or ±0.4％
	-167℃ or higher and lower than +40℃	3	±2.5	3	±2.5	-200℃ or higher and lower than 0℃	STD.	±1.7or ±1％
	-200℃ or higher and lower than -167℃	3	±0.015\|t\|	3	±0.015\|t\|	-200℃ or higher and lower than 0℃	STD.	±1.7or ±1％
J	-40℃ or higher and lower than +375℃	1	±1.5	1	±1.5	0℃ or higher and lower than +760℃	STD.	±2.2or ±0.75％
	+375℃ or higher and lower than +750℃	1	±0.004\|t\|	1	±0.004\|t\|		STD.	±2.2or ±0.75％
	-40℃ or higher and lower than +333℃	2	±2.5	2	±2.5		SP.	±1.1or ±0.4％
	+333℃ or higher and lower than +750℃	2	±0.0075\|t\|	2	±0.0075\|t\|		SP.	±1.1or ±0.4％
T	-40℃ or higher and lower than +125℃	1	±0.5	1	±0.5	0℃ or higher and lower than +370℃	STD.	±1or ±0.75％
	+125℃ or higher and lower than +350℃	1	±0.004\|t\|	1	±0.004\|t\|		STD.	±1or ±0.75％
	-40℃ or higher and lower than +133℃	2	±1.0	2	±1.0		SP.	±0.5or ±0.4％
	+133℃ or higher and lower than +350℃	2	±0.0075\|t\|	2	±0.0075\|t\|		SP.	±0.5or ±0.4％
	-67℃ or higher and lower than +40℃	3	±1.0	3	±1.0	-200℃ or higher and lower than 0℃	STD.	±1or ±1.5％
	-200℃ or higher and lower than -67℃	3	±0.015\|t\|	3	±0.015\|t\|	-200℃ or higher and lower than 0℃	STD.	±1or ±1.5％

（1）
The tolerance is the maximum allowable limit calculated by the value of the temperature obtained from the standard thermo-electromotive force table converted from thermo-electromotive force subtracted by the temperature at the temperature measuring junction.
（2）
The tolerance of ASTM is a larger value of either ℃ or the % of the measured temperature.
（3）
|t| is the measured temperature indicated with the temperature (℃) unrelated to + and - signs.
（4）
Classes 1, 2, and 3 correspond to Classes 0.4, 0.75, and 1.5 of the old JIS.
（5）
JIS, BS, and DIN Standards are the same as the IEC Standard.
（6）
ASTM Standard is the old ANSI Standard.
（7）
The standard year is applied to the latest version.