Okazaki | Kouei Japan Trading

Manufacturer: Okazaki Manufacturing Company

Specifications

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.

Materials and Standard Dimensions of Metal Protection Tubes

Types JIS code is in ( ).	Material code	Dimension (φ/mm)		Max. length （mm）	Common use temperature limit（℃）※1	Features
Types JIS code is in ( ).	Material code	Outer diameter	Inner diameter	Max. length （mm）	Common use temperature limit（℃）※1	Features
304SS （SUS304）	A	10	7	2000	900	Excellent at heat/acid/alkali resistance. Weak against sulfur and reducing gas.
		12	9	2000
		15	11	3950
		21.7	15.7	3950
316SS （SUS316）	C	10	7	2000	900	Heat/acid/alkali resistance is the same as the resistance of 304SS; however, corrosion resistance is excellent at high temperatures.
		12	9	2000
		15	11	3950
		21.7	15.7	3950
316LSS （SUS316L）	CL	10	7	2000	900	The amount of C is less than that in 316SS, and the material has grain-boundary corrosion resistance.
		12	9	2000
		15	11	3950
		21.7	16.1	3950
310S SS （SUS310S）	D	15	11	3950	1000	It is heat-resistant steel with a high content rate of Ni-Cr and great at oxidizing atmospheres at high temperature.
		21.7	16.1
		27.2	21.4
SUH446	P	21.7	16.1	3950	1000	It is heat-resistant with 27Cr steel and strong against reducing flame and sulfur gas.
4C54 （SANDVIK P4）		21.3	16
4C54 （SANDVIK P4）		26.9	21.6
UMCo50	U	22	16	3950	1150	It is a cobalt-base alloy, which has strong heat-resistance/wear-resistance and is also strong for sulfur gas.
UMCo50	U	27	21	3950	1150
INCONEL600 （NCF600eq）	B	22	16	3950	1050	It is strong in both a high temperature oxidizing and reducing atmosphere.
TITANIUM	T	15	11	3950	250	Corrosion resistance is extremely excellent at low temperatures; however, the material becomes fragile with oxidation at high temperatures.
		17.3	12.7
		21.7	16.1
		27.2	21.6

Material and Standard Dimensions of Non-metal Protection Tubes

Types	Material code	Dimension（φmm）		Max. length （mm）	Common use temperature limit（℃）※1	Features
Types	Material code	O.D. Outer diameter	I.D. Internal diameter	Max. length （mm）	Common use temperature limit（℃）※1	Features
Alumina quality	P1	8	5	1000	1500	It is excellently stable in oxidizing/reducing atmospheres at a high temperature equivalent to JIS R1401 PT1 and excellent in corrosion resistance at a high temperature. It is suitable for measuring temperature within a furnace of 1,600℃ or higher and molten metal.
		10	6
		13	9
		15	11
		17	13
		20	15
High-alumina quality	P0	8	5	1000	1600	It has excellent heat resistance/corrosion resistance/electric insulation/mechanical strength equivalent to JIS R1401 PT0. It is excellent in wear resistance because of high hardness.
		10	6
		13	9
		15	11
		20	16
		15	6
		20	10
Silicon carbide Refractory	GK	20	12	1000	1600	It has high refactoriness and a large heat conduction rate. It is not easily affected by zinc, aluminum, lead, acids and alkalis. It is robust for rapid heating/cooling and excellent in spalling resistance. It is suitable for outer tubes for doubled protection tubes.
		by25	17
		30	20
		35	25
		40	25
		45	30
		50	30
		60	40