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 components—NO_x, SO₂, CO, CO₂, and O₂—in industrial combustion exhaust streams. Designed in accordance with international CEMS performance standards—including ISO 14956, EN 15267, and EPA Performance Specification 3 (PS-3) and PS-4A—the system employs dual optical detection principles: alternating-flow non-dispersive infrared (NDIR) spectroscopy for CO, CO₂, and NO_x, and magnetic pressure (paramagnetic) detection for O₂. SO₂ is measured via NDIR with proprietary interference-compensating optical filters, minimizing cross-sensitivity from H₂O vapor and CO₂. The architecture eliminates mechanical zero drift through flow-modulated optical path design and thermally stabilized detector arrays, ensuring long-term baseline stability without routine optical recalibration.

Key Features

• Single-analyzer multi-component capability: Simultaneous, continuous quantification of NO_x, SO₂, CO, CO₂, and O₂ within one integrated analysis unit—reducing footprint, calibration complexity, and maintenance overhead.
• Front-access modular design: All service operations—including filter replacement, sensor inspection, and calibration gas connection—are performed from the front panel. No rear or side access required, enabling installation in space-constrained environments such as boiler rooms or stack enclosures.
• Compact footprint: ENDA-600ZG housing occupies ≤50% of legacy ENDA-500-series volume; ENDA-640ZG variant (with triple gas cylinder configuration) achieves further spatial optimization, supporting wall-mounting and retrofit deployments where floor space is limited.
• Interference-mitigated SO₂ measurement: Integrated dual-wavelength NDIR detection with HORIBA-exclusive interference compensation filters suppresses spectral overlap effects from water vapor and CO₂, maintaining accuracy under variable moisture and temperature conditions.
• Accelerated dry/wet calibration: SO₂ span calibration time reduced to ≤3 minutes using certified dry calibration gases—compared to ≥15 minutes required for traditional wet-gas calibration protocols—minimizing process downtime and improving QA/QC workflow efficiency.
• Intuitive 7-inch capacitive touchscreen interface: Real-time display of all five gas concentrations with trend graphs, alarm status, calibration logs, and diagnostic codes. Menu navigation supports multilingual UI (English, Japanese, Chinese) and configurable data export formats (CSV, PDF).

Sample Compatibility & Compliance

The ENDA-600ZG series is validated for hot, humid, and particulate-laden flue gas streams typical of coal-fired boilers, municipal waste incinerators, cement kilns, and combined-cycle power plants. Sample conditioning employs heated extractive sampling (180 °C probe and line), Peltier-cooled condensate removal (<5 °C dew point), and particle filtration (≤0.1 µm). The system complies with EU Industrial Emissions Directive (IED) monitoring requirements and meets the technical criteria for certification under China’s HJ 75-2017 and HJ 76-2017 CEMS standards. Data integrity adheres to GLP/GMP-aligned audit trail protocols, with optional 21 CFR Part 11-compliant software modules available for regulated pharmaceutical and biomanufacturing applications.

Software & Data Management

Embedded firmware supports automated zero/span verification, drift correction logging, and event-triggered data capture (e.g., alarm activation, calibration start/stop). Raw analog outputs (4–20 mA) and digital communication (RS-485 Modbus RTU, optional Ethernet TCP/IP) enable seamless integration with DCS, SCADA, and central EMS platforms. HORIBA’s optional CEMS Manager software provides remote configuration, historical data visualization (hourly/daily/monthly averages), compliance reporting (e.g., 30-day rolling averages per EPA Method 7E), and electronic signature-enabled calibration records. All data timestamps are synchronized to GPS or NTP servers, and storage includes redundant SD card + internal flash memory (≥1 year at 1-min intervals).

Applications

• Regulatory CEMS for coal-, oil-, and gas-fired thermal power plants subject to national emission limits (e.g., China’s GB 13223, EU LCP BREF)
• Continuous monitoring of acid gases (SO₂, NO_x) and combustion efficiency indicators (O₂, CO) in municipal solid waste (MSW) and hazardous waste incinerators
• Process optimization and combustion control in industrial steam boilers, glass melting furnaces, and ceramic kilns
• Stack testing support and reference method validation per ISO 10849, ASTM D6522, and EN 14792
• Environmental monitoring networks for regional air quality management authorities requiring traceable, auditable emissions data

FAQ

What gas components can the ENDA-600ZG measure simultaneously?
NO_x (as NO), SO₂, CO, CO₂, and O₂—all in a single analyzer unit without external gas switching valves.
Does the system require periodic optical alignment or lamp replacement?
No. The NDIR optical module uses solid-state IR sources and thermopile detectors with no moving parts or consumable lamps; calibration stability is maintained via flow modulation and temperature-compensated signal processing.
How is moisture interference handled during SO₂ measurement?
Through HORIBA’s patented dual-band interference filter array that dynamically corrects for H₂O absorption bands overlapping the SO₂ spectral region, eliminating need for separate moisture analyzers or complex chemometric algorithms.
Can the ENDA-600ZG be integrated into existing plant DCS systems?
Yes—via standard 4–20 mA analog outputs (per gas component) and Modbus RTU over RS-485; optional Ethernet gateway enables OPC UA or MQTT-based cloud connectivity.
Is the system certified for use in explosion-hazardous areas?
The base ENDA-600ZG is rated for general indoor industrial environments (IP54); ATEX/IECEx-certified variants (e.g., ENDA-600ZG-EX) with intrinsic safety barriers are available upon request for Zone 2/22 installations.