LECO ON736 Oxygen and Nitrogen Analyzer

Overview

The LECO ON736 Oxygen and Nitrogen Analyzer is a high-precision, inert gas fusion-based elemental analyzer engineered for the simultaneous quantitative determination of oxygen and nitrogen in solid inorganic materials. It operates on the fundamental principle of high-temperature graphite furnace fusion under ultra-pure helium or argon atmosphere—effectively liberating interstitial, combined, and surface-bound oxygen and nitrogen as diatomic gases (O₂, N₂) and carbon monoxide (CO). The evolved gases are then separated and quantified using dual detection modules: a thermally stabilized non-dispersive infrared (NDIR) cell for CO (proportional to total oxygen content) and a high-sensitivity thermal conductivity detector (TCD) for N₂. This dual-detection architecture ensures trace-level accuracy, excellent linearity across wide dynamic ranges (ppm to %), and long-term signal stability without mechanical moving parts or routine optical realignment.

Key Features

• Thermally isolated NDIR detector with constant-temperature housing and drift-compensated electronics—eliminates ambient temperature fluctuations and enables >12-month calibration stability.
• OMI-2 bypass-capable gas filtration system featuring chemically selective scrubbers and particulate traps, minimizing detector contamination and extending maintenance intervals.
• Robust, fully sealed electrode assembly with integrated crucible holder—prevents atmospheric ingress during sample loading and ensures reproducible fusion geometry and gas evolution kinetics.
• Modular 20-position automatic sample and crucible changer with non-sequential queue management, supporting priority insertion, batch reordering, and unattended overnight operation.
• Touch-optimized Windows®-based control software with intuitive workflow navigation, real-time spectral preview, and embedded diagnostic dashboards for rapid fault isolation.
• Optional SmartLine® Remote—a secure, encrypted remote diagnostics platform compliant with ITAR and ISO/IEC 27001 data handling protocols—enables OEM-level troubleshooting and firmware updates without on-site service calls.

Sample Compatibility & Compliance

The ON736 accommodates diverse sample forms including metals (ferrous and non-ferrous alloys, superalloys, titanium grades), refractory compounds (tungsten carbide, silicon nitride, alumina ceramics), and geological matrices (slags, ores, synthetic oxides). Its graphite crucible compatibility extends to standard 3–5 g samples with optional low-mass crucibles for micro-analysis (<100 mg). All hardware and software components comply with ASTM E1019 (Standard Test Methods for Determination of Carbon, Sulfur, Nitrogen, and Oxygen in Steel, Iron, Nickel, and Cobalt Alloys), ISO 14284 (Steel and Iron—Sampling and Sample Preparation for Determination of Chemical Composition), and USP for elemental impurity testing. Data integrity meets FDA 21 CFR Part 11 requirements via electronic audit trails, user-authenticated access controls, and immutable raw-data archiving.

Software & Data Management

The instrument is controlled by LECO’s proprietary Cornerstone® software suite, deployed on a dedicated industrial PC with multi-touch interface support. Core functions include method-driven analysis sequencing, real-time gas chromatogram visualization, peak integration with baseline correction algorithms, and automated report generation in PDF/XLS formats. Optional Cornerstone® Mobile extends full analytical visibility to iOS and Android devices—allowing remote monitoring of run status, live gas signal plots, and instrument health metrics (furnace temperature, carrier gas pressure, detector voltage drift). All data files are stored in vendor-neutral HDF5 format, enabling third-party integration with LIMS platforms (e.g., Thermo Fisher SampleManager, LabVantage) via ODBC and RESTful APIs. Audit logs record every user action—including parameter changes, calibration events, and result overrides—with timestamp, IP address, and digital signature.

Applications

The ON736 serves critical quality assurance roles across metallurgical R&D, foundry process control, aerospace material certification, and semiconductor substrate purity verification. Typical use cases include: monitoring interstitial oxygen in Ti-6Al-4V turbine blades per AMS 2249; quantifying nitrogen pickup in stainless steel welds per AWS A5.4; validating oxygen content in silicon carbide ceramics for nuclear-grade applications (ASTM C1597); and certifying low-nitrogen purity in high-purity copper anodes used in electrorefining. Its 85-second typical analysis cycle supports high-throughput QC labs processing >120 samples per shift with <0.5% RSD at 100 ppm O level.

FAQ

What sample types require special preparation prior to ON736 analysis?

Surface-oxidized or hygroscopic samples (e.g., magnesium alloys, rare-earth metals) must be cleaned via ultrasonic acetone rinse and dried under vacuum to prevent erroneous oxygen contribution from adsorbed moisture or oxide layers.
Is the ON736 compliant with GLP/GMP documentation requirements?

Yes—Cornerstone® software includes configurable electronic signatures, 21 CFR Part 11-compliant audit trails, and IQ/OQ documentation templates aligned with ASTM E2500 and Annex 11.
Can the instrument be integrated into an existing factory automation network?

Yes—via optional Ethernet/IP or Modbus TCP gateway modules, enabling PLC-triggered analysis start/stop, real-time result push to MES systems, and alarm event forwarding to SCADA platforms.
What maintenance intervals are recommended for the OMI-2 filtration system?

Filter cartridges should be replaced every 500 analyses or quarterly—whichever occurs first—with usage logging automatically tracked in the maintenance dashboard.
Does the ON736 support certified reference material (CRM) library management?

Yes—users can define custom CRM libraries with uncertainty propagation, matrix-matched calibration curves, and automatic drift correction based on scheduled CRM checks.