HT-THERMIC 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°C.
• 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.

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 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 Alloy] THE INDIAN INSTITUTE of METALS

ULTRA HIGH TEMPERATURE THERMOCOUPLE

MODEL HT

• Max. Temp. 2,000℃, 1% Accuracy of the Reading
• For use in Inert, Reducing (H2) and Vacuum Applications
• Patented Special Hot Junction
• Electron Beam weld closed Protection Tube, filled with Pure Dry Argon Gas
• Perfectly Integrated Robust Construction

MODEL HT 270A

• Max. Temp. 1,500℃, A Heavy Duty, Flame-Proof Version of already proven Model HT
• 1% Accuracy of the Reading
• The only High Temperature Thermocouple for use both in dry Oxidizing and Reducing environments where all the platinum group thermocouples fail
• No need of expensive gas purging, successfully be used for a long-term under dry stagnant atmospheres
• Unique Triple protection and Flame-Proof Safety Construction
• Avoid use under wet or water-vapour rich conditions

Descriptions of HT-THERMIC

HT-THERMIC is a trade name of inert gas filled thermocouple for use under super- high temperatures. HT-THERMIC was first developed in Japan by YAMARI through unique process and is enjoying good reputation as a prominent sensor for the
use in high temperature heat treatments and sinterings, etc. because of its capability of measuring temperatures up to 2,000℃ for a long-term with an excellent stability.
Based-on the technology of HT-THERMIC, YAMARI manufactures various
sophisticated thermocouples for high temperature measurement to the customer's needs. HT-THERMIC will exceed foreign products in all respect of cost merit, quality and performance.

Standard Types of HT-THERMIC