HORIBA ENDA-600ZG Online Multi-Component Flue Gas Analyzer

Overview

The HORIBA ENDA-600ZG is a compact, high-stability online flue gas analyzer engineered for continuous, simultaneous measurement of up to five critical combustion-related gases—NO_x, SO₂, CO, CO₂, and O₂—in industrial stack emissions. Designed for compliance with global regulatory frameworks including EU Directive 2010/75/EU (IED), U.S. EPA Performance Specification 2 (PS-2), and China’s HJ 75–2017 and HJ 76–2017 standards, the ENDA-600ZG integrates dual physical detection principles: alternating-flow non-dispersive infrared (NDIR) spectroscopy for NO_x, SO₂, CO, and CO₂, and magnetic pressure (paramagnetic) detection for O₂. This hybrid architecture eliminates reliance on carrier gases for oxygen analysis and avoids optical alignment drift—key failure modes in conventional dual-beam NDIR systems. The analyzer operates on a 1-second alternating cycle between sample and reference gas streams, ensuring intrinsic zero-point stability and self-cleaning of the optical cell through periodic gas exchange. Its design reflects over three decades of HORIBA’s field-proven expertise in CEMS deployment, with more than 100,000 units installed worldwide across diverse thermal processes.

Key Features

• Single-analyzer, five-gas capability: Simultaneous real-time quantification of NO_x, SO₂, CO, CO₂, and O₂ without external gas switching manifolds or multi-analyzer integration.
• Drift-free NDIR architecture: Alternating-flow modulation eliminates need for mechanical optical recalibration; zero drift remains within ±1.0% F.S. over 24 hours.
• Paramagnetic O₂ detection: No nitrogen or synthetic air supply required—ambient air serves as reference gas, reducing consumables and operational cost.
• Integrated interference compensation: Dedicated H₂O and CO₂ correction sensors mitigate cross-sensitivity in NO_x and SO₂ channels; proprietary interference filter optics suppress spectral overlap effects.
• Compact footprint: Overall analyzer volume reduced by 50% versus prior-generation ENDA platforms; dimensions optimized for retrofit installations where space is constrained.
• Accelerated dry calibration: SO₂ span calibration completed in ≤3 minutes using certified dry standard gas—contrasted with 15-minute wet-gas procedures in legacy models.
• Front-access maintenance: All service operations—including filter replacement, calibration valve actuation, and sensor inspection—are performed from the instrument’s front panel.

Sample Compatibility & Compliance

The ENDA-600ZG is deployed with application-specific sampling systems validated for harsh flue gas matrices. For waste incineration, integrated Cl₂ scrubbers and triple-stage thermoelectric coolers (primary + dual secondary) minimize SO₂/NO₂ loss due to aqueous absorption while achieving T₉₀ ≤ 90 s (SO₂-free) or ≤ 240 s (SO₂-present). In coal-fired power plants, optional NH₃ removal modules prevent sulfamic acid formation during SO₂ analysis. High-dust environments (e.g., sintering plants, cement kilns) utilize wall-mounted auto-blowback controllers (350 × 550 × 180 mm), downsized by 23% versus previous designs. All sampling trains comply with ISO 12039, EN 15267-3, and ASTM D6522 for particulate-laden, humid, and corrosive gas streams. The system supports GLP/GMP audit trails when paired with optional data acquisition software compliant with FDA 21 CFR Part 11.

Software & Data Management

The ENDA-600ZG features an embedded 10.1-inch capacitive touchscreen interface with intuitive navigation for configuration, diagnostics, and historical review. Real-time display shows all five gas concentrations simultaneously, alongside O₂-corrected values (e.g., NO_x @ 6% O₂), 1-hour rolling averages, and alarm status. Calibration logs, zero/span events, and maintenance timestamps are stored onboard for ≥12 months. Up to 12 analog outputs (4–20 mA) support transmission of instantaneous, corrected, or averaged signals to DCS/SCADA systems. Optional HORIBA CEMS Manager software enables remote monitoring, automated report generation (PDF/CSV), and secure user-role management aligned with IEC 62443-3-3 cybersecurity requirements.

Applications

The ENDA-600ZG is qualified for continuous emission monitoring in regulated thermal processes requiring Tier 1 or Tier 2 CEMS certification. Proven deployments include:

• Coal- and gas-fired power stations (NO_x/SO₂ compliance per MATS or LCPD)
• Municipal solid waste and hazardous waste incinerators (Cl₂/HCl co-monitoring readiness)
• Steelmaking facilities (sinter plants, blast furnaces, coke ovens)
• Glass melting furnaces (high-temperature, alkali-rich gas streams)
• Sulfuric acid production plants (SO₂ conversion efficiency tracking)
• Industrial steam boilers and cogeneration units (combustion optimization & carbon accounting)

Its modular sampling architecture allows customization for dew point control, acid gas removal, and particulate pre-filtration—ensuring representative, artifact-free gas conditioning per EN 14181 QA/QC protocols.

FAQ

What detection principles does the ENDA-600ZG use for each gas?
NO_x, SO₂, CO, and CO₂ are measured via alternating-flow non-dispersive infrared (NDIR); O₂ is determined using paramagnetic (magnetic pressure) detection.
Is carrier gas required for O₂ measurement?
No—ambient air serves as the reference gas for the paramagnetic O₂ sensor, eliminating the need for bottled N₂ or synthetic air supplies.
How often does the system require calibration?
Automatic zero and span calibration is scheduled every 7 days; manual dry-gas calibration for SO₂ takes ≤3 minutes and may be performed on-demand.
Can the ENDA-600ZG meet U.S. EPA PS-2 requirements?
Yes—the analyzer and its associated sampling system are designed to satisfy PS-2 accuracy, drift, and response time criteria when installed and maintained per manufacturer specifications.
What is the maximum allowable dust loading for the sampling probe?
With optional auto-blowback controller and heated probe, the system handles particulate concentrations up to 10 g/Nm³ in accordance with EN 15267-3 test protocols.