High Temperature And High Pressure Tungsten-Rhenium Thermocouple

High temperature and high pressure tungsten‑rhenium thermocouples are the most heat‑resistant metallic thermocouples available at present. They are mainly used in vacuum, hydrogen and inert gas atmospheres, with a maximum operating temperature up to 2300℃.They feature excellent linear thermoelectric characteristics, high thermoelectric power rate, ultra-high temperature resistance and low cost.The available types include WRe5‑WRe26 (Type C) and WRe3‑WRe25 (Type D), with accuracy classes of 1.0% and 0.5%.

Our company took the lead in promoting and applying tungsten‑rhenium thermocouples nationwide starting in 1997, and is one of the key manufacturers of tungsten‑rhenium thermocouples in China. We hold a leading position in the industry in terms of production output and market share.We have participated in formulating the national standard Tungsten‑Rhenium Thermocouple Wires and Reference Tables and the industrial standard Technical Specifications for Tungsten‑Rhenium Thermocouples.

Our tungsten‑rhenium thermocouples are constructed with protective tubes made of specially processed molybdenum, tantalum, tungsten and alumina, densely filled with high‑temperature insulating materials suitable for corresponding temperatures, and hermetically sealed in a vacuum environment.

In particular, our high temperature and high pressure tungsten‑rhenium thermocouples capable of withstanding temperatures above 1900℃ and pressures above 6 MPa were the first successfully developed in China. A national patent was applied for on December 10, 2012 (Patent No. ZL 2012 2 0676417.6).

The double‑sheath tungsten‑rhenium thermocouple with alumina and molybdenum can also be used in oxidizing atmospheres up to 1600℃, creating technical conditions for tungsten‑rhenium thermocouples to replace precious metal thermocouples in most applications.

At present, the main application field of tungsten‑rhenium thermocouples is the vacuum furnace industry."Vacuum" refers to a state where the pressure within a given space is lower than standard atmospheric pressure.The standard atmospheric pressure is 101325 Pa. Generally:

• 10⁵–10² Pa: low vacuum
• 10²–10⁻¹ Pa: medium vacuum
• 10⁻¹–10⁻⁵ Pa: high vacuum
• <10⁻⁵ Pa: ultra‑high vacuum

Tungsten‑rhenium thermocouples for vacuum furnaces have very high sealing requirements. Our company adopts special treatments to ensure that the leakage rate of the thermocouple inside the vacuum furnace is lower than the overall pressure rise rate of the furnace.

The type designation method for tungsten‑rhenium thermocouples is specified in Type Designation Method for Thermocouples and Resistance Temperature Detectors.The relevant technical parameters for selection are shown in the table below:

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