KQXL High Temp. Low Drift TC Probes w/Standard Size Connectors

Supported Applications

The Omega KQXL/NQXL series comprises Super OMEGACLAD™ XL Thermocouple Probes designed for high-performance temperature measurement in demanding environments. These mineral insulated (MI) probes are engineered to resist carburization, oxidation, and chlorination. The series is available exclusively in Type K (CHROMEGA™-ALOMEGA™ XL Sheath) and Type N (OMEGA-P™-OMEGA-N™ XL Sheath) calibrations.

Operating Conditions & Performance

The probes are rated for process temperatures up to 1335°C (2400°F). The series meets or exceeds Special Limits of Error (SLE) and EN 60584-2: Tolerance Class 1. Temperature drift is specified as less than 2.8°C (37°F) in 25 weeks, with a documented capability for a 0.8 mm (0.032") probe to withstand 815°C (1500°F) for 3 years.

Response times vary by sheath diameter and are measured as approximate values for ungrounded probes in water:

• 0.25 sec** (0.8 mm)
• 0.3 sec** (1.6 mm)
• 0.55 sec** (3.2 mm)
• 2.25 sec** (6.4 mm)

Note: Tests were conducted using ungrounded probes in an open-air, electric muffle furnace versus a Type 'S', NIST-traceable standard. Individual results may vary depending on customer application.

Configuration Options

The series supports multiple probe styles and dimensional configurations to accommodate various installation requirements:

• Probe Styles: Quick-Connect, Transition Junction (Miniature or Heavy-Duty), Industrial Head Assemblies, Utility Handle Probes.
• Junction Types: Specify 'G' (Grounded), 'E' (Exposed), 'U' (Ungrounded), or 'S' (Surface).
• Dual Element Configuration: Available upon request.

Sheath Diameters and Dimensions

• Inch Sizes: 0.010 in, 0.020 in, 0.032 in, 0.040 in, 0.062 in, 0.125 in (1/8"), 1/16", 3/16", 1/4", 5/16", and 3/8".
• Metric Sizes: 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 inch lengths include 6 in, 12 in, 18 in, and 24 in; metric options include 150 mm, 300 mm, 450 mm, and 600 mm. Custom lengths are available.

Connectors and Accessories

• Mating connectors and clamps are sold separately; see accessory charts for compatible parts.
• Probes with 0.032" diameter (and larger) or 0.75 mm diameter (and larger) are supplied with molded transition joints. Smaller-sized probes feature stainless steel transition joints with stripped leads standard.
• M8/M12 Plug Options: Add "M8-S-M" for male straight M8, "M8-R-M" for male right-angled M8, "M12-S-M" for male straight M12. Note: The source lists "M12-S-M" as the code for both straight and right-angled M12 plugs.
• PFA Coating: Order standard model number with suffix '-PFA' (max 200°C / 400°F).

Key Product Differences

The series is divided by calibration and sheath material. Type K probes utilize the CHROMEGA™-ALOMEGA™ XL Sheath, while Type N probes use the OMEGA-P™-OMEGA-N™ XL Sheath.

• Quick-Connect Probes: Model prefixes include KQXL/NQXL for standard inch sizes and SCAXL/SNNXL or KMQXL/NMQXL for miniature diameters (e.g., 0.010" to 0.125"). Metric quick-connect models use the M suffix in the diameter code.
• Transition Junction Probes: Identified by prefixes such as TJ36-CAXL/TJ36-NNXL for standard sizes and KMTXL/NMTXL or SCAXL/SNNXL variants for miniature diameters. Metric transition junctions follow similar naming conventions with M suffixes.
• Industrial Head Assemblies: Replacement probes are available under the NB(*) prefix (e.g., NB-CAXL-18). These assemblies include industrial head housings.
• Utility Handle Probes: Identified by prefixes KHXL/NHXL with suffix '-RSC' for replacement probe configurations.