ELTRA CHS-580 Carbon/Hydrogen/Sulfur Elemental Analyzer

Overview

The ELTRA CHS-580 is a high-performance, laboratory-grade elemental analyzer engineered for the simultaneous and independent quantification of carbon (C), hydrogen (H), and sulfur (S) in solid and viscous samples. It operates on the principle of high-temperature combustion followed by selective infrared (IR) absorption spectroscopy — a method standardized under DIN EN 15936 for total organic carbon (TOC) determination in soils and solid waste. During analysis, samples (typically 50–500 mg) are combusted in a precisely controlled resistance furnace at temperatures up to 1,350 °C, converting C, H, and S into CO₂, H₂O, and SO₂, respectively. These gaseous combustion products are then swept through a series of gas-conditioning modules (including drying, desulfurization, and halogen removal) before entering dedicated IR detection cells. Each element is measured using dual-wavelength non-dispersive infrared detectors, enabling high linearity and reproducibility across an exceptionally broad dynamic range (0.005–100 wt%). The instrument’s modular architecture supports flexible configuration — from single-element (C-only or S-only) to full C/H/S operation — with optional high-concentration sulfur cells and integrated total inorganic carbon (TIC) measurement capability.

Key Features

• Simultaneous C/H/S determination in a single run, eliminating sequential analysis delays and cross-contamination risks
• Dual IR detection cells per element for extended linear range coverage and improved low-level sensitivity (down to 0.005 wt%)
• Resistance-heated combustion furnace with stable thermal profile (230 V, 50/60 Hz) and programmable ramp/hold temperature control
• Modular gas purification system: integrated Mg(ClO₄)₂ dryer, CuO-based sulfur trap, and halogen scrubber for matrix robustness
• Compliance-ready design: meets DIN EN 15936 for TOC in environmental matrices; supports FDA 21 CFR Part 11–compliant software via optional audit trail and electronic signature modules
• Scalable automation: optional 36-position or high-capacity 130-position autosampler with acid-resistant plastic crucible holder for aggressive sample types (e.g., coal ash, flue dust, acidic sludges)

Sample Compatibility & Compliance

The CHS-580 accommodates a wide spectrum of heterogeneous and challenging matrices without pre-dilution or derivatization. Validated applications include geological materials (limestone, gypsum, soil, fly ash), fossil fuels (coal, coke, petroleum coke), industrial byproducts (slag, foundry sand, catalyst residues), biomass (tobacco, plant tissue, rubber), and environmental samples (dust, filter particulates, sewage sludge). Its combustion protocol ensures complete oxidation of refractory carbon forms (e.g., graphite, carbides) and volatile sulfur species (e.g., sulfides, sulfates), delivering stoichiometric recovery. All configurations comply with ISO 10693 (carbon in iron and steel), ASTM D5373 (C/H/S in coal and coke), and USP for elemental impurity screening in pharmaceutical excipients. When equipped with the TIC module, the system satisfies regulatory requirements for inorganic carbon quantification in environmental and geochemical testing workflows.

Software & Data Management

ELTRA’s proprietary WinElement software provides full instrument control, method development, calibration management, and real-time spectral monitoring. It supports GLP/GMP-aligned data integrity practices, including user-level access control, password-protected method editing, and timestamped audit trails for all critical events (e.g., calibration updates, sample re-runs, parameter changes). Quantitative results are exportable in multiple formats — CSV, TXT, XML — and integrate natively with LIMS platforms via ODBC or HL7 interfaces. Calibration curves are stored with metadata (date, operator, standard lot number), and drift correction algorithms apply automatic baseline compensation during long analytical sequences. For regulated environments, optional 21 CFR Part 11 compliance packages include electronic signatures, locked result archives, and change-controlled software versioning.

Applications

• Quality control of metallurgical feedstocks (e.g., carbon content in ferroalloys, sulfur in pig iron)
• Environmental monitoring of contaminated soils and sediments per EPA Method 9060A (TOC) and ISO 10390 (pH + elemental C)
• Coal and coke certification per ASTM D3176 and ISO 6256 for energy content modeling
• Pharmaceutical raw material screening for residual catalysts and elemental impurities (ICH Q3D)
• Research in carbon sequestration studies, where precise C/H ratio determination informs organic matter stability assessments
• Waste-to-energy facility feedstock characterization, ensuring optimal combustion efficiency and emissions compliance

FAQ

What sample types require the acid-resistant autosampler configuration?

Samples containing high concentrations of halogens, fluorides, or acidic ash residues (e.g., municipal waste incinerator fly ash, PVC-contaminated plastics, or sulfuric acid-treated ores) necessitate the acid-resistant plastic crucible holder to prevent corrosion-induced carryover and hardware degradation.
Can the CHS-580 quantify inorganic carbon independently?

Yes — when equipped with the optional TIC (Total Inorganic Carbon) module, the instrument performs acid liberation of carbonate-bound CO₂ prior to combustion, enabling discrete quantification of inorganic vs. organic carbon fractions in soils, sediments, and carbonates.
Is method validation support available for regulated laboratories?

ELTRA provides IQ/OQ documentation templates, certified reference material (CRM) compatibility lists (NIST, BAM, ERM), and application notes aligned with ISO/IEC 17025 method validation criteria (precision, trueness, LOD/LOQ, ruggedness).
How does the dual-IR cell configuration improve measurement reliability?

Dual cells per element allow auto-ranging between high-sensitivity (low-concentration) and high-dynamic-range (high-concentration) modes within one analysis sequence, eliminating manual range switching and reducing operator-induced variability.
Does the system support unattended overnight operation?

With the 130-position autosampler and scheduled start/stop functions in WinElement, the CHS-580 supports fully automated batch processing — including calibration verification checks and blank monitoring — for extended unattended runs compliant with ISO 17025 surveillance requirements.