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Precious metal and base metal thermocouples widely used in industries for the measurement of temperature in the range from low to ultrahigh temperatures. With the best staff and advanced technologies, we manufacture a wide variety of quality products for use in general industry and explosive and hazardous areas.
■Metal Sheathed Thermocouple (THERMIC)
■Protection Tube Type Thermocouple
■CERATHERMO Thermocouple
■AD-THERMIC for Reducing Atmosphere at High Temp.
■Tungsten Rhenium Thermocouple for High Temp.
Metal Sheathed Thermocouple (THERMIC)
Metal Sheathed thermocouple is comprised of metal sheath in which the thermoelectric elements are embedded in highly compacted magnesium oxide (MgO) insulation.

The construction guarantees a superb insulation quality and high resistance to pressure, and has, in addition, an excellent flexibility, which has been given to it by annealing in a proper method

Types of Thermocouple
K, E, J, T, N, R
Sheath O.D. (mm)
0.25, 0.5, 1.0, 1.6, 2.2, 3.2, 4.8, 6.4, 8.0
Sheath Material
SS316L, SS310S, Inconel 600
JIS Class 1, JIS Class 2
Single, Double
Hot Junctions
Type I(Grounded), Type II(Ungrounded), Type III(Exposed)
*Please consult us for other sheath material, type of thermocouple and dimension.
Standard Models of THERMIC Metal Sheathed Thermocouple (Model: TM)
TMB: Flexible Shield Lead Type
TMH: Terminal Head Type
TMES(L): Metal Connector Type
TMN: Screwed-in Plain Nipple Type
TNDS(L): Quick Connector Type
TMNF: Flange Nipple Type
Protection Tube Type Thermocouple
Protection tube type thermocouple is comprised of metal or ceramic protection tube in which the thermoelectric elements are embedded with beaded ceramic insulators. Proper selecting of protection tube and insulators in consideration of measuring condition is the key for the measurement of temperature.
Types of Thermocouple
K, E, J, T, N, R
Conductor Dia. (mm)
0.32, 0.5(Type R), 0.65, 1.0, 1.6, 2.3, 3.2
JIS Class 1, JIS Class 2
Standard Models of Protection Tube Type Thermocouple (Model: TE)
TE12: Metal Protection Tube Type
TE22: Ceramic Protection Type
with Metal Support
TE13: Screwed-in Metal Protection
Tube Type with Nipple
TE23: Screwed-in Ceramic Protection
Tube Type with Nipple
TE14: Metal Protection Tube Type
with Fixed Flange
TE24: Ceramic Protection Tube Type
with Fixed Flange
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CERATHERMO Thermocouple
Ceramics-tubed wires or mineral insulated cables have conventionally been used in harsh environments. However, they posed serious problems in flexibility, connections, and the ratio of outer cable diameter to conductor diameter. Yamari has launched a flexible ceramic-insulated thermocouple wire, achieved through a new fabrication process, SLPC using a liquid phase process similar to an electrostatic spattering method.
1. Easy to handle - - - - - - - - No breakage at joints in insulators
2. Space Saving - - - - - - - - Virtually same diameter as bare wire
3. Lightweight - - - - - - - - Virtually same weight as bare wire
4. High Flexibility - - - - - - - - No insulators are necessary
5. Low out gassing - - - - - - - - Usable in super vacuum atmosphere
Semiconductor processing equipment
Temperature distribution measurement of silicon wafer and P.C. board
Vacuum equipment
Temperature measurement of P.C. board on spattering equipment, and various evaporation equipment
CVD equipment, Heat treatment furnace, etc.
Temperature measurement of precision sintering furnace, etc.
Thermocouple Wire
Type of Thermocouple
Diameter (mm)
0.2, 0.32
※We make hot junction upon request.
※Improper EMF may be generated, if hot junction and leads were made without removing ceramic layer.
CERATHERMO Thermocouple with hot junction
CERATHERMO Thermocouple with hot junction
※Any length can be made upon request.
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AD-THERMIC Thermocouple for use in Reducing Atmosphere at High Temperature
A new type K thermocouple conductor was jointly developed with a world-class manufacturer of thermoelectric wire to improve long-term stability and service life at elevated temperature in reducing atmosphere. AD-THERMIC is a MI thermocouple cable comprising of this advanced thermocouple conductor and Inconel 600 sheath with MgO insulation. An excellent long-term stability and longer service life compared to the conventional MI thermocouple cables have been proven on our field test using heat treatment furnace and reducing furnace.
1. Excellent long-term emf stability in hydrogen and carburizing atmosphere at elevated temperature.
2. Prolonged service life in continuous operation.
Drift Test at 1,000℃ (Sheath O.D.: 1.6mm)
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Tungsten Rhenium Thermocouple VAC-Curate 2100 (W・5%Re-W・26%Re)
Tungsten Rhenium Thermocouple
The demand for measuring very high temperature in research laboratories, specialized furnaces, and in other high temperature experimental and industrial applications has grown dramatically in recent years. In response to this demand, Yamari Industries has been providing its Tungsten Rhenium thermocouples and expert knowledge to customers needing accurate measurements of high temperatures in a wide range of fields. Now, Yamari is pleased to announce it has developed a new type of Tungsten Rhenium thermocouple, “VAC-Curate 2100”, in conjunction with a world class Japanese manufacturer of quality alloys and can supply thermocouple elements conforming to ASTM standard E988-96 in matched pairs.
Advantages of the Tungsten Rhenium Thermocouple
Compared to platinum elements, the tungsten rhenium thermocouple has a high and relatively linear thermal emf output.
Tungsten Rhenium can measure temperature over a range extending to 2,300℃.
Noble metal thermocouples are usually used in oxidizing or inert atmosphere. Tungsten Rhenium thermocouples are suitable for use in reducing or inert atmosphere and in vacuum or nuclear environments.
Characteristics of the VAC-Curate 2100 Thermocouple
The graphs below compare conventional Tungsten Rhenium thermocouple against Yamari’s VAC-Curate 2100 thermocouple. As shown, the VAC-Curate 2100 outperforms conventional Tungsten Rhenium both on initial tolerance and emf drift.
Initial; Tolerance Drift
Tolerance comparison between a conventional Tungsten Rhenium thermocouple and Yamari VAC-Curate 2100 thermocouple, using the standard thermocouple calibrated by NIST.
Measured errors at the freezing point of Cu(1084.62℃) after 3 hours and 10 hours exposure in an argon atmosphere.
Physical Properties of the VAC-Curate 2100
Melting point (℃) 3375℃※ 3021℃※
Specific Gravity 19.4 19.6
Resistivity μΩ・cm(30℃) 12.6 28.8
Coefficient of Expansion(0~100℃) 4.6×10 -6 4.9×10 -6
Specific Heat (30℃) 0.131 0.132
※Melting points refer to W/3%Re-W/25%Re as the references listed do not provide values to W/5%Re-W/26%Re alloys.
References: Monograph Series on Alloy Phase Diagrams 7
「Phase Diagrams of Binary Tungsten Alloys」THE INDIAN INSTITUTE of METALS
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