HORIBA ENDA-600ZG Series Continuous Emission Monitoring System (CEMS) for Flue Gas Analysis

Overview

The HORIBA ENDA-600ZG Series is a compact, high-reliability Continuous Emission Monitoring System (CEMS) engineered for real-time, simultaneous measurement of up to five key flue gas constituents: NO_x, SO₂, CO, CO₂, and O₂. Designed for regulatory compliance and long-term operational integrity in demanding industrial environments, the system integrates alternating-flow non-dispersive infrared (NDIR) spectroscopy for acidic and combustible gases with paramagnetic oxygen detection—eliminating the need for carrier gas supply. Its core architecture employs dual-beam modulation and periodic reference-sample alternation at 1 Hz, ensuring intrinsic zero-point stability and eliminating optical drift without manual alignment. This physical design principle—rooted in over three decades of HORIBA’s field-proven CEMS deployment across >100,000 installations globally—enables continuous, unattended operation under fluctuating temperature, pressure, and particulate load conditions typical of boiler stacks, waste incinerators, and metallurgical furnaces.

Key Features

• Single-analyzer multi-component capability: Simultaneous quantification of NO_x, SO₂, CO, CO₂, and O₂ within one integrated housing—reducing footprint, calibration complexity, and maintenance overhead.
• Zero-drift NDIR detection: Alternating-flow modulation ensures continuous self-cleaning of the measurement cell via periodic sample/reference gas exchange, suppressing span drift and maintaining baseline integrity over extended intervals.
• Paramagnetic O₂ sensing: Utilizes ambient air as the reference medium; no external N₂ or synthetic carrier gas required—lowering consumable costs and simplifying site infrastructure.
• Interference-compensated optics: Proprietary interference filter arrays correct cross-sensitivity from H₂O vapor and CO₂, particularly critical for accurate NO_x and SO₂ reporting in high-moisture streams.
• Reduced physical envelope: Overall analyzer volume reduced by 50% versus prior-generation models; auto-blowback controller dimensions minimized to 350 × 550 × 180 mm—enabling wall-mount installation in space-constrained utility rooms or control cabinets.
• Accelerated dry-gas calibration: SO₂ span adjustment completed in ≤3 minutes using certified dry standard gas—contrasting with legacy wet-calibration protocols requiring ≥15 minutes and condensation management.

Sample Compatibility & Compliance

The ENDA-600ZG series accommodates highly variable flue gas matrices through application-specific sampling subsystems. For waste-to-energy facilities, an integrated Cl₂ scrubber prevents halogen-induced corrosion; for coal-fired power plants, optional NH₃ removal modules mitigate sulfite formation during SO₂ analysis. A three-stage electronic cooling system—comprising primary and secondary Peltier coolers plus a mist eliminator—achieves dew point suppression below 4 °C, minimizing aqueous-phase loss of SO₂ and NO₂. High-dust applications employ a wall-mounted auto-blowback controller (23% smaller than predecessor units) that periodically back-purges the probe filter using instrument-grade compressed air. All configurations comply with ISO 12039, EN 15267, and US EPA Performance Specification 2 (PS-2) for CEMS validation. Data logging and alarm records adhere to GLP/GMP audit-trail requirements per FDA 21 CFR Part 11 when paired with optional secure software licensing.

Software & Data Management

The embedded 7-inch capacitive touchscreen interface supports intuitive navigation across live concentration plots, calibration logs, alarm history, and stoichiometric conversion settings (e.g., O₂-corrected emission values per regulatory limits). Up to 12 analog/digital outputs are configurable—including instantaneous component values, 1-hour rolling averages, and dynamically corrected outputs—supporting integration with DCS/SCADA systems. Firmware enables automated 7-day zero/span verification cycles with timestamped results stored locally for ≥12 months. Optional HORIBA CEMS Manager software provides remote diagnostics, spectral validation reports, and export-ready CSV/PDF archives compliant with EU IED reporting templates and China’s HJ 75-2017 technical specifications.

Applications

The ENDA-600ZG series is validated for continuous monitoring in regulated thermal processes where emission fidelity directly impacts environmental permit adherence and carbon accounting. Primary use cases include:

• Coal- and biomass-fired power generation units subject to EU LCP BREF and US MATS standards;
• Municipal solid waste incinerators requiring simultaneous tracking of acid gases (SO₂, HCl), NO_x, and CO under EU Directive 2000/76/EC;
• Primary steel production (sinter plants, blast furnaces) and non-ferrous smelting (copper, zinc roasters);
• Chemical manufacturing sites (e.g., sulfuric acid plants) where SO₂ recovery efficiency must be verified;
• Combined heat and power (CHP) systems and industrial steam boilers operating under local air quality ordinances.

FAQ

What regulatory standards does the ENDA-600ZG meet for CEMS certification?
It satisfies ISO 12039:2000 for SO₂/NO_x/CO measurement, EN 15267-3 for QA/QC validation, and US EPA PS-2 for relative accuracy testing—subject to site-specific configuration and third-party audit.
How does the system handle high-moisture flue gas without compromising SO₂ accuracy?
The triple-stage condensate management system (primary + dual electronic coolers + mist eliminator) maintains sample gas dew point <4 °C while preserving soluble species via rapid phase separation and inertial droplet removal.
Is carrier gas required for O₂ measurement?
No. The paramagnetic sensor uses ambient air as its reference medium, eliminating dependency on bottled N₂ or synthetic air supplies.
Can the analyzer operate continuously during scheduled maintenance windows?
Yes—its modular front-access design allows all consumables (filters, desiccants, calibration cells) and electronics to be serviced without rear-panel disassembly or system isolation.
What is the maximum particulate loading the sampling probe can tolerate?
With optional auto-blowback control and heated probe assembly, the system sustains reliable operation at inlet dust concentrations up to 10 g/Nm³—verified per EN 15267-3 Annex F test protocols.