RAT-TJ

Supported Applications

The Omega RAT-TJ series comprises rugged Transition Joint High-Temperature Platinum Assemblies designed for temperature measurement in oxidizing or reducing atmospheres. These assemblies feature a stainless steel support tube and are rated up to 1650°C (3000°F). The product line includes standard probe configurations as well as versions with an optional compression fitting that allows field positioning of the immersion length.

Operating Conditions & Performance

The series is engineered for high-temperature service, supporting process temperatures up to 1650°C (3000°F). The probe diameter measures ¼" (6.35 mm), with insertion lengths that are variable when configured with a compression fitting or fixed based on the selected model length. Standard overall dimensions include a 38 mm (1.50") head and a 27 mm (1.06") transition section for models such as RAT-TJ36-30-12, which features a 300 mm (12") probe.

Wetted materials consist of High-Purity Alumina Protection Tubes, Stainless Steel Support Tubes, and Double Bore High-Purity Hard-Fired Alumina Insulators. The series supports NIST Traceable Calibration availability upon request.

Configuration Options

• Thermocouple Calibrations: Available in Type R (Pt vs Pt 13% Rh), Type S (Pt vs Pt 10% Rh), and Type B (Pt 6% Rh vs Pt 30% Rh).
• Wire Sizes: Offered in 24 AWG or 30 AWG. Note that Type B is specified as 26 AWG stranded.
• Housing and Mounting: Standard configurations include stripped leads; optional compression fittings (SSLK-38-14 for ¼" mounting thread, SSLK-38-38 for ⅜" mounting thread) enable field positioning. A stainless steel support tube is available on specific models.
• Connectors: Standard NHX Ceramic Connector rated to 650°C (1200°F); HSTW Liquid Crystal Polymer connector rated to 260°C (500°F). Optional connectors include SMPW, SHX, OSTW, and NHX-M.
• Cable Options: Lead wires are available with Fiberglass or PFA insulation. BX armored cable is an optional configuration.

Key Product Differences

The series distinguishes between standard probe assemblies and those equipped with a stainless steel support tube and optional compression fitting, indicated by the "ST4" designation in model numbers (e.g., RAT-TJ36-ST4-30-12). Model numbering follows the format RAT/SAT/BAT-TJXX-CALIBRATION-AWG-LENGTH-OPTIONS, where calibration prefixes denote Type R, S, or B. Additional suffixes modify the configuration: "-SB" denotes lead wires over 1 m (40"); "-TT" indicates a specific termination; and connector types are appended as "-SMPW-M", "-SHX-M", "-OSTW-M", or "-NHX-M". Custom probe lengths exceeding standard dimensions require modifying the length digit in the model number.