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

Overview

The HORIBA ENDA-600ZG Series is a compact, high-integrity flue gas continuous emission monitoring system (CEMS) engineered for long-term, unattended operation in demanding industrial environments. Designed around dual-principle detection architecture—alternating-flow non-dispersive infrared (NDIR) spectroscopy for NO_x, SO₂, CO, and CO₂, and magnetic pressure (paramagnetic) detection for O₂—the system eliminates optical drift, avoids zero-point instability, and requires no carrier gas for oxygen measurement. Each analysis cycle operates on a 1-second alternating basis between sample and reference gas streams, enabling continuous self-cleaning of the optical cell and intrinsic compensation for optical fouling or thermal drift. This architecture delivers metrological stability compliant with international CEMS performance standards including ISO 14956, EN 15267, and EPA Performance Specification 3 (PS-3) and PS-4A for gaseous pollutants.

Key Features

• Single-analyzer platform simultaneously quantifies up to five regulated flue gas components: NO_x, SO₂, CO, CO₂, and O₂, reducing footprint, calibration complexity, and maintenance overhead.
• Alternating-flow NDIR detection eliminates need for periodic optical realignment; no zero drift over extended operational periods due to synchronous differential measurement.
• Magnetic pressure O₂ sensor utilizes ambient air as reference gas—no external N₂ supply required—lowering installation cost and operational energy demand by 200 VA versus prior-generation units.
• Integrated interference compensation: proprietary interference filter wheels correct for cross-sensitivity from H₂O vapor and CO₂ in NO_x/SO₂ channels; dedicated CO₂ sensor enables real-time correction of CO₂-induced NO_x bias.
• Touchscreen HMI with intuitive navigation supports rapid access to live concentration plots, calibration logs, alarm history, dilution/temperature/pressure compensation settings, and O₂-corrected emission values (e.g., NO_x @ 3% O₂).
• Physical footprint reduced to 50% of predecessor models (W×H×D: 350 × 550 × 180 mm for auto-blowback controller); all service operations—including filter replacement, calibration, and sensor access—performed from front panel only.

Sample Compatibility & Compliance

The ENDA-600ZG series integrates with application-specific sampling systems validated across diverse combustion sources: municipal waste incinerators (with Cl₂ scrubbers and NH₃ removal modules), coal- and gas-fired power plants, glass melting furnaces, steel reheating furnaces, and sulfuric acid production lines. Its three-stage electronic cooling dehydration system—comprising primary and dual secondary coolers—achieves dew points ≤2 °C while minimizing dissolution losses of SO₂ and NO₂ in condensate. Optional SO₃ mist eliminators prevent acid corrosion downstream; low-temperature NO_x converters maintain >95% conversion efficiency across 0–500 °C flue gas ranges. All configurations meet EU Industrial Emissions Directive (IED) requirements and support GLP-compliant audit trails per FDA 21 CFR Part 11 when paired with HORIBA’s optional data acquisition software.

Software & Data Management

• Real-time output of raw and O₂-normalized concentrations (NO_x, SO₂, CO) via analog (4–20 mA) and digital (RS-485/Modbus RTU) interfaces—up to 12 configurable outputs.
• Automated 7-day calibration cycle with dry-gas SO₂ span verification completed in ≤3 minutes—reducing downtime versus legacy wet-calibration protocols requiring ≥15 minutes.
• Embedded event logging records calibration events, alarm triggers (including pre-alarm diagnostics), sensor faults, and flow/pressure excursions with UTC timestamps.
• Compliant with EN 14181 QA/QC requirements: automatic zero/span checks, drift verification, and data validation flags for regulatory reporting (e.g., EU MRV, US EPA Subpart F).

Applications

The ENDA-600ZG is deployed globally in stationary source compliance monitoring where space constraints, corrosive matrices, or multi-pollutant reporting mandates demand robustness and modularity. Typical installations include:

• Waste-to-energy facilities: integrated Cl₂ abatement and HCl-resistant sampling trains.
• Thermal power stations: NH₃ slip mitigation during SCR operation and high-dust auto-blowback filtration.
• Primary metal production: high-temperature sampling with ceramic probe variants and SO₃ condensation control.
• Chemical process heaters: trace-level CO detection with enhanced signal-to-noise ratio via dual-path NDIR optics.
• Cement kilns and lime calciners: particulate-laden stream handling with heated probe options and adaptive blowback scheduling.

FAQ

Does the ENDA-600ZG comply with EPA PS-4A for SO₂ and NO_x?

Yes—the system meets PS-4A accuracy, response time, and drift specifications when installed with certified sampling interfaces and operated per HORIBA’s QA/QC protocol.
Is external nitrogen required for O₂ measurement?

No—magnetic pressure detection uses ambient air as the reference medium; no consumable gases are needed.
Can the system operate in high-humidity flue gas without SO₂ loss?

Yes—the triple-stage electronic cooler achieves consistent dew point control and minimizes aqueous-phase dissolution of acidic gases.
What is the maximum particulate loading the sampling system tolerates?

With optional auto-blowback controller and heated probe, the system handles up to 10 g/Nm³ suspended solids typical of waste incineration applications.
How is data integrity ensured for regulatory audits?

All measurements, calibrations, alarms, and configuration changes are time-stamped and stored locally with write-protected memory; optional software enables encrypted export compliant with EN 14181 Level 2/3 QA requirements.