SPPL

The Omega SPPL Series offers high-quality bare thermocouple wire made with noble Platinum-Rhodium alloys for demanding temperature measurement applications. Designed for use where insulation isn’t an option, this bare thermocouple wire delivers exceptional resistance to oxidation and corrosion—ideal for use in high-heat furnaces, metallurgical research, and process industries pushing the limits of temperature.

Choose from Type S, R, or B wire options to suit your environmental conditions.  Sizes range from 0.025 to 0.812 mm (0.001 to 0.032"") diameter.  

Types R and S are recommended for continuous use in oxidizing or inert atmospheres up to 1398°C (2550°F) or short-term exposures to 1482°C (2700°F). Type B is rated for continuous use up to 1704°C (3100°F) in oxidizing or inert atmospheres. When operating near these maximum temperatures, the heavier-gage wire sizes are recommended. All 3 thermocouple types can be used in a vacuum for short periods. Type B offers the greatest stability in such applications. None should be used in reducing atmospheres or in atmospheres containing metallic or non-metallic vapors unless protected by non-metallic protection tubes. Do not insert directly into metallic protection tubes.

Backed by Omega’s longtime reputation for quality and precision, the SPPL Series wire is supplied as matched pairs (positive and negative) for accurate temperature referencing. Whether you’re building custom probes, retrofitting existing sensors, or conducting high-temperature testing, this bare thermocouple wire gives you reliable performance, material purity, and consistent measurement you can trust.