WWW26-W5W26-W3W25

Supported Applications

The Omega Tungsten-Rhenium Fine Diameter Bare Thermocouple Wire series provides uninsulated refractory metal wire for high-temperature temperature measurement. The product overview identifies use in hydrogen or inert-gas atmospheres and vacuum environments, where the material is specified to operate up to 2315°C (4200°F). The series includes matched pairs with calibrated accuracy and supports extreme temperature sensor configurations.

Operating Conditions & Performance

The wire operates in hydrogen or inert-gas atmospheres and vacuum. It is rated for temperatures up to 2315°C (4200°F) under these conditions but deteriorates rapidly under oxidizing conditions. The series encompasses multiple thermocouple types, including Tungsten vs. Tungsten 26% Re (Symbol G*), Tungsten 5% Re vs. Tungsten 26% Re (Symbol C*), and Tungsten 3% Re vs. Tungsten 25% Re (Symbol D*). Note that these symbols are not ANSI symbols.

Configuration Options

The series offers fine diameter bare wire in various configurations defined by material composition and wire size. The model number guide follows the format W<type><wire_dia_code>-<wire_dia_code>, such as W5W26-010 for 1' of 0.25 mm (0.010") Dia., uninsulated refractory metal tungsten-rhenium thermocouple wire.

Wire Types and Diameters

• Type G*: Tungsten vs. Tungsten 26% Re available in diameters of 0.08 (0.003), 0.13 (0.005), 0.25 (0.010), 0.38 (0.015), and 0.51 (0.020) mm.
• Type C*: Tungsten 5% Re vs. Tungsten 26% Re available in diameters of 0.08 (0.003), 0.13 (0.005), 0.25 (0.010), 0.38 (0.015), and 0.51 (0.020) mm.
• Type D*: Tungsten 3% Re vs. Tungsten 25% Re available in diameters of 0.13 (0.005), 0.25 (0.010), 0.38 (0.015), and 0.51 (0.020) mm.

Extension-Grade Wire Options

The series documentation also lists extension-grade wire options for specific thermocouple types:

• Tungsten-Rhenium Extension: Uninsulated lead wire (Model EX-C) for W5%Re vs W26%Re, covering 204 to 426 °C (400 to 800 °F).
• Platinum Thermocouple Extensions: Insulated duplex extension wires are available for Types R and S using Cu-Alloy 11 up to 200°C (392°F), Type B using Cu-Cu up to 100°C (212°F), and Type C using Ni/Al-Ni/Cu up to 427°C (800°F).

Accessories

The series supports integration with accessories including Ceramic Connectors NOX Series, Ceramic Protection Tubes PTRA Series, Bare Wire Platinum Thermocouples P10R/P13R/P30R Series, and High Temperature Metal Sheathed Probes XMO Series.

Key Product Differences

Variants within the series are distinguished by thermocouple material composition (Types G*, C*, D*) and wire diameter. The documentation notes that some items are sold only as matched pairs, where a double foot consists of 1' of positive and 1' of matched negative wire. Metric dimensions provided in specifications are approximate.