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

Overview

The HORIBA ENDA-600ZG Series is a compact, high-integrity Continuous Emission Monitoring System (CEMS) engineered for real-time, simultaneous measurement of up to five key flue gas components: NO_x, SO₂, CO, CO₂, and O₂. Designed for regulatory compliance and long-term operational reliability in demanding industrial environments, the system integrates alternating-flow non-dispersive infrared (NDIR) spectroscopy for acid gases and combustibles with magnetic pressure (paramagnetic) detection for oxygen—eliminating the need for carrier gas or optical realignment. Its core architecture leverages dual-beam, alternating-sample/reference gas modulation at 1 Hz frequency, ensuring intrinsic zero-point stability and eliminating drift-induced calibration drift over time. The system meets international performance standards for CEMS applications—including ISO 14956, EN 15267, and EPA Performance Specification 3/4—supporting continuous compliance reporting under environmental regulatory frameworks such as EU IED, US Clean Air Act Title V, and China’s HJ 75–2017.

Key Features

• Single-Unit Multi-Component Analysis: Simultaneous, independent quantification of NO_x, SO₂, CO, CO₂, and O₂ within one analyzer housing—reducing footprint, integration complexity, and lifecycle maintenance cost.
• Drift-Free NDIR Architecture: Alternating-flow modulation ensures continuous self-cleaning of optical cells; sample and reference gas streams alternately flush the detector chamber, minimizing contamination accumulation and mitigating span drift.
• Interference-Compensated Detection: Integrated interference filter wheels and H₂O/CO₂-specific compensation algorithms correct cross-sensitivity effects—particularly critical for NO_x measurement in high-moisture, high-CO₂ combustion exhaust.
• Compact Modular Design: Overall instrument volume reduced by 50% versus prior-generation models; front-access-only service layout enables full maintenance without rear panel removal or system disassembly.
• Wall-Mountable Auto-Backflush Controller: Reduced footprint (350 × 550 × 180 mm) and 23% smaller than legacy units; supports programmable back-pulse intervals to maintain filter integrity in high-dust applications (e.g., waste incineration, sintering plants).
• Dry-Method SO₂ Calibration: Achieves full-range SO₂ calibration in ≤3 minutes—compared to 15 minutes required for wet calibration on earlier platforms—minimizing downtime during QA/QC procedures.

Sample Compatibility & Compliance

The ENDA-600ZG Series accommodates diverse flue gas matrices through application-specific sampling subsystems. For waste-to-energy facilities, integrated Cl₂ scrubbers and three-stage electronic cooling (primary + dual secondary chillers) suppress SO₃ condensation and minimize aqueous-phase loss of SO₂ and NO₂. In coal-fired power plants, optional NH₃ removal modules prevent sulfite formation during SO₂ analysis, while high-efficiency NO_x converters ensure complete NO₂→NO conversion at elevated inlet concentrations. All sampling trains comply with ISO 12141 for particulate filtration efficiency and EN 14181 for automated performance testing (APT). The system supports GLP/GMP-aligned audit trails via embedded event logging (calibration, alarm, maintenance), and optional FDA 21 CFR Part 11-compliant software packages are available for regulated pharmaceutical and biomanufacturing sites.

Software & Data Management

Embedded Linux-based firmware drives a 10.1-inch capacitive touchscreen interface with intuitive navigation—enabling rapid access to real-time concentration plots, calibration logs, alarm history, and stoichiometric correction settings (e.g., O₂-based dilution correction per EN 14792). The system provides twelve configurable analog/digital outputs: five instantaneous component values, three O₂-corrected emissions (NO_x, SO₂, CO), and four dynamic averaging modes (1-, 8-, 24-hour rolling means). Data export supports Modbus TCP, RS-485, and optional OPC UA protocols for seamless SCADA and EMS integration. Firmware updates are performed via secure HTTPS, with SHA-256 signature verification and rollback capability.

Applications

• Coal- and gas-fired power generation units requiring Tier 3 CEMS compliance
• Municipal solid waste and hazardous waste incinerators subject to EU Directive 2000/76/EC
• Steel sintering plants and coke ovens with high particulate and SO₂ loads
• Glass melting furnaces operating under reducing atmospheres
• Sulfuric acid production lines with aggressive SO₃/H₂SO₄ vapors
• Industrial steam boilers serving chemical, food, and textile manufacturing

FAQ

What gas components can the ENDA-600ZG measure simultaneously?
NO_x (as NO), SO₂, CO, CO₂, and O₂—all measured continuously and independently within a single analyzer unit.
Does the system require external zero/span gases or carrier gas?
No external carrier gas is needed for O₂ measurement (magnetic pressure method uses ambient air); zero/span calibration uses certified standard gases, but no continuous purge gas is required for NDIR operation.
How does the system handle high-moisture or corrosive flue gas?
Through application-tailored sampling trains—including SO₃-resistant probe materials, multi-stage condensate removal, Cl₂/NH₃ scrubbing, and corrosion-resistant internal wetted surfaces per ASTM G101 guidelines.
Is the ENDA-600ZG compliant with EPA PS-3/PS-4 or EN 15267 certification requirements?
Yes—the system is type-approved per EN 15267-3 for SO₂, NO_x, CO, CO₂, and O₂; site-specific QA/QC protocols align with EPA PS-3 (O₂) and PS-4 (SO₂/NO_x).
Can the analyzer be integrated into an existing DCS or environmental data acquisition platform?
Yes—standard Modbus RTU/TCP and optional OPC UA interfaces support bidirectional communication with industrial control systems, including Emerson DeltaV, Siemens PCS7, and Honeywell Experion.