NAKE 750 Benchtop Direct-Reading Spark Optical Emission Spectrometer

Overview

The NAKE 750 is a refurbished benchtop direct-reading spark optical emission spectrometer (OES) engineered for high-precision elemental analysis of solid metallic samples in industrial quality control and laboratory environments. Based on the Paschen-Runge optical architecture, it employs a vacuum-sealed Czerny-Turner monochromator with a 750 mm focal length and a 2400 lines/mm holographic grating to deliver high spectral resolution and long-term optical stability. The instrument utilizes spark excitation — a controlled, pulsed discharge between a tungsten electrode and the conductive sample surface — to generate plasma emissions. These atomic and ionic line spectra are dispersed across the focal plane and quantified by an array of photomultiplier tubes (PMTs), each independently biased and calibrated for optimal signal-to-noise ratio. Designed for routine operation in foundries, metallurgical labs, and aerospace component suppliers, the NAKE 750 supports quantitative determination of major, minor, and trace elements—including C, P, S, B, Si, Mn, Cr, Ni, Cu, Al, Mg, Ti, Zn, Pb, and Co—in ferrous (Fe-based), non-ferrous (Al, Cu, Ni, Mg, Ti), and superalloy matrices.

Key Features

• Paschen-Runge optical layout with vacuum optical chamber (≤10⁻³ mbar) to eliminate atmospheric absorption below 190 nm—critical for accurate C, P, S, and N measurement.
• High-energy digital solid-state spark source with continuously adjustable frequency (300–1000 Hz) and energy output; enables optimized excitation for diverse matrix types—from low-alloy steels to high-conductivity aluminum alloys.
• Patented Single Discharge Acquisition (SDA) technology: captures full spectral response from individual spark events, improving precision through statistical averaging of ≥100 discharges per analysis.
• Variable Delay Integration (VDI): separates background continuum emission from analyte line intensities by dynamically adjusting integration timing relative to spark onset—reducing interferences from oxide layers or surface contamination.
• Independent high-voltage power supply for each PMT channel (0–1000 V, 0.1 V resolution), programmable via software to maximize dynamic range across concentration orders (ppm to wt%).
• Single-piece lens mount design minimizes optical realignment during maintenance; integrated green LED reference lamp accelerates photometric stabilization and short-term repeatability.
• ARM9-based embedded system provides real-time monitoring of vacuum pressure, argon purity, high-voltage status, spark energy, and detector gain—logging all parameters with timestamps for GLP-compliant audit trails.

Sample Compatibility & Compliance

The NAKE 750 accepts flat, cylindrical, or irregularly shaped conductive solids (minimum diameter 10 mm, thickness ≥3 mm) after standard grinding or milling preparation. It complies with ASTM E415, ISO 11577, and GB/T 4336 for spark OES methodology. Its vacuum optical path meets ISO 8596 requirements for UV transmission stability. All firmware and acquisition logic adhere to IEC 61508 SIL-2 functional safety principles for industrial instrumentation. Data handling supports 21 CFR Part 11-compliant electronic signatures when paired with validated LIMS integration modules. Routine calibration verification follows certified reference materials (CRMs) traceable to NIST SRMs or IRMM standards.

Software & Data Management

Controlled via NAKE SpectraSuite v5.x (Windows 10/11 compatible), the system offers method-driven workflows with password-protected user roles (Operator, Supervisor, Administrator). Calibration curves support multi-point linear and quadratic regression with residual error mapping. Each analysis generates a structured XML report containing raw intensity values, net intensities, background-corrected ratios, certified CRM match scores, and uncertainty estimates per element (k=2, based on within-run SD and CRM homogeneity data). Raw spectral data (ASCII .dat) and processed results (.csv, .pdf) are exportable without proprietary codec restrictions. Audit logs record all parameter changes, calibration updates, and user logins with immutable timestamps—enabling full traceability for ISO/IEC 17025 accreditation audits.

Applications

• Production-line grade verification of carbon steel, stainless steel, and tool steels (C, S, P, Cr, Mo, V, Nb).
• Aluminum alloy composition control in automotive die-casting (Si, Fe, Cu, Mg, Mn, Ti).
• High-purity copper and brass analysis for electrical conductivity certification (O, Ag, As, Bi, Sb, Sn).
• Superalloy feedstock screening in aerospace manufacturing (Ni, Co, Cr, Al, Ti, Ta, W).
• Recycled metal scrap sorting and specification compliance testing (RoHS-relevant Cd, Pb, Hg, Cr⁶⁺ proxy via total Cr).
• Research-grade quantitative mapping of segregation effects in cast ingots using sequential spark positioning.

FAQ

Is the NAKE 750 compliant with ISO/IEC 17025 requirements for accredited laboratories?

Yes—the instrument’s documented calibration procedures, traceable CRM usage, environmental monitoring, and full audit logging meet Clause 7.7 (Measurement Traceability) and Clause 7.8 (Reporting Results) of ISO/IEC 17025:2017.
What maintenance intervals are recommended for the refurbished unit?

Vacuum pump oil change every 6 months; PMT gain recalibration every 12 months or after 5000 analyses; spark stand cleaning and electrode replacement after 10,000 sparks; full optical alignment verification annually.
Can the system be upgraded to support additional analytical channels post-purchase?

Yes—hardware supports up to 32 fixed PMT positions; additional channels require installation of factory-aligned slits and PMTs, followed by full spectral recalibration using NAKE-certified service engineers.
Does the system include argon gas regulation hardware?

Yes—a built-in dual-stage argon pressure regulator (0–0.6 MPa), flow meter (0–20 L/min), and leak-tested purge manifold are integrated into the base platform.
Is remote diagnostics supported?

Yes—via secure TLS-encrypted VNC tunnel over Ethernet; requires customer-provided firewall exception for port 5900 and prior written authorization per NAKE Remote Support Agreement.