KHXL High Temp Low Drift Handheld Thermocouple Probes

 Supported Applications

The Omega KHXL and NHXL series comprises Super OMEGACLAD® XL thermocouple probes designed for high-temperature measurement in harsh environments. These mineral-insulated (MI) handheld probes are engineered to resist carburization, oxidation, and chlorination. The series supports Type K (CHROMEGA®-ALOMEGA®) and Type N (OMEGA-P®-OMEGA-N®) calibrations.

Operating Conditions & Performance

The probes operate in process temperatures up to 1335°C (2400°F). Accuracy meets or exceeds SLE and EN 60584-2 Tolerance Class 1 standards. Long-term stability is documented as less than 2.8°C drift in 25 weeks.

Response time varies by sheath diameter for ungrounded probes tested in water:

• 0.3 sec** for 0.032" Dia. probe
• 0.55 sec** for 0.125" Dia. probe
9 2.25 sec** for 0.250" Dia. probe

Note: Tests were conducted using ungrounded probes in an open-air, electric muffle furnace versus a Type 'S', NIST-traceable standard.

Configuration Options

The series offers extensive configuration options across probe styles, dimensions, and junction types to accommodate specific installation needs.

• Probe Styles: Quick-connect (molded), miniature connector, heavy-duty transition junction, industrial head assemblies, and utility handle probes.
• Junction Types: Grounded (G) or ungrounded (U). Some configurations include exposed options depending on the specific model series.
• Diameters: Available in standard inch sizes from 0.010" to 3/8", and metric sizes including 0.25 mm, 0.5 mm, 0.75 mm, 1.0 mm, 1.5 mm, 3.0 mm, 4.5 mm, 6.0 mm, 8.0 mm, and 9.5 mm.
• Lengths: Standard lengths include 6", 12", 18", and 24" (inch series) or 150 mm, 300 mm, 450 mm, and 600 mm (metric series). Custom insertion lengths are available via ordering codes.
• Sheath Materials: CHROMEGA®-ALOMEGA® XL Sheath for Type K; OMEGA-P®-OMEGA-N® XL Sheath for Type N.

Additional options include dual-element configurations and PFA coating (consult sales). A universal connector and cable clamp are included with the probes. Replacement probes are available for industrial head assemblies by adding '-RP' to the part number.

Key Product Differences

The series is divided into two primary alloy families based on thermocouple type:

• KHXL Series (Type K): Utilizes CHROMEGA®-ALOMEGA® XL Sheath. Model numbers begin with 'K' or include the ANSI color code for Type K.
• NHXL Series (Type N): Utilizes OMEGA-P®-OMEGA-N® XL Sheath. Model numbers begin with 'N' or include the ANSI color code for Type N.

Variations also exist by connector style and housing:

• Quick-Connect Probes (KQXL/NQXL): Feature molded standard connectors. Miniature versions are designated with 'M' in the model number (e.g., KMQXL).
• Transition Junction Probes (TJ36/KMTXL/NMTXL): Designed for heavy-duty transition junctions or miniature transition junction probes.
• Industrial Head Assemblies: Feature replaceable probe elements. Model numbers typically include 'NB' prefixes in the ordering guide context, with replacement parts ordered by adding '-RP'. Smaller-sized probes are supplied with stainless steel transition joints and stripped leads as standard.
• Utility Handle Probes (KHXL/NHXL): Designed for handheld use with a utility handle configuration. Model numbers include the 'RSC' suffix in many variants to denote specific connector or assembly configurations.