Fuji Electric ZRE Series Flue Gas Analyzer

Overview

The Fuji Electric ZRE Series Flue Gas Analyzer is a high-integrity, CE-marked continuous emission monitoring system engineered for real-time, in-situ quantification of key combustion exhaust gases in industrial flue streams. Based on dual-wavelength non-dispersive infrared (NDIR) absorption spectroscopy, the analyzer delivers stable, interference-resistant measurement of sulfur dioxide (SO₂), nitrogen oxides (NOₓ — reported as NO and NO₂ equivalents), carbon monoxide (CO), carbon dioxide (CO₂), and methane (CH₄) — with optional configurations supporting all five components simultaneously. Oxygen (O₂) is measured independently via a zirconia-based electrochemical sensor, ensuring stoichiometric accuracy for excess air and combustion efficiency calculations. Designed for permanent installation in stack or duct environments, the ZRE complies with the mechanical, thermal, and electromagnetic robustness requirements of IEC 61265 and EN 15267-3 for certified CEMS applications. Its compact modular architecture supports both extractive and in-situ probe configurations, with heated sample lines and integrated particulate filtration to maintain sample integrity under high-dust, high-moisture conditions typical of coal-fired boilers, cement kilns, and waste incinerators.

Key Features

• NDIR optical modules with thermoelectrically stabilized detectors and dual-beam referencing for drift-free SO₂, NOₓ, CO, CO₂, and CH₄ measurement
• Zirconia O₂ sensor with automatic temperature compensation and linearized output across 0–25% v/v range
• Configurable multi-range capability: auto-ranging from ppm-level (e.g., 0–500 ppm SO₂) to %-level (e.g., 0–25% CO₂) without hardware change
• Digital signal processing firmware enabling real-time cross-interference correction (e.g., H₂O vapor compensation for NOₓ channels)
• Integrated diagnostics including mirror contamination monitoring, lamp intensity tracking, and flow/pressure validation alerts
• Standard 4–20 mA analog outputs per gas channel with HART protocol support; optional Modbus TCP or Profibus DP for plant DCS integration
• IP65-rated enclosure with internal purge capability for hazardous area deployment (ATEX Zone 2 / IECEx Zone 2 compliance available)

Sample Compatibility & Compliance

The ZRE analyzer accommodates flue gas matrices with temperatures up to 200 °C (probe version) or conditioned extractive samples at 4–60 °C (dilution/extraction version), and handles particulate loadings ≤100 mg/Nm³ when paired with an ISO 12103-1 A2-certified ceramic filter. It meets EU Directive 2010/75/EU (IED) and EN 14181 requirements for QAL1 certification and ongoing performance verification (PVT). All gas-specific measurement algorithms are traceable to NIST SRM 1964 (SO₂), NIST SRM 1610 (NO), and NPL CRM 101 (CO₂). The system supports full audit trails compliant with FDA 21 CFR Part 11 when operated with Fuji’s optional secure data logger module, including electronic signatures, user access levels, and immutable event logging.

Software & Data Management

The embedded ZRE Control Interface provides local configuration, calibration management, and live trend visualization via a 7-inch capacitive touchscreen. Remote operation is enabled through Fuji’s Web-based CEMS Manager software (v4.2+), which supports automated daily zero/span checks, drift correction logs, and report generation aligned with EPA Method 7E, ISO 12039, and EN 15267-4 templates. Data export is available in CSV, XML, and PDF formats, with configurable upload intervals to central SCADA or environmental data management systems (EDMS). All calibration events, alarm states, and maintenance actions are time-stamped and stored locally for ≥12 months — satisfying GLP/GMP data retention mandates and facilitating third-party audit readiness.

Applications

• Regulatory compliance monitoring for coal-, biomass-, and gas-fired power plants under national CEMS mandates
• Process optimization in cement clinker production, where real-time NOₓ and O₂ feedback enables selective non-catalytic reduction (SNCR) dosing control
• Emissions verification during boiler commissioning and periodic stack testing per ISO 10849
• Waste-to-energy facilities requiring simultaneous measurement of CO (combustion completeness), dioxin precursor indicators (CO + hydrocarbons), and O₂ for thermal destruction efficiency assessment
• Research applications in combustion laboratories studying low-NOₓ burner performance and alternative fuel blends

FAQ

What certifications does the ZRE hold for regulatory CEMS use?

The ZRE carries TÜV Rheinland QAL1 certification per EN 15267-3 for SO₂, NOₓ, CO, CO₂, and O₂ channels, and is pre-qualified for EPA PS-11 equivalency in the United States.
Can the analyzer operate unattended for extended periods?

Yes — with scheduled auto-calibration (zero/span) every 24 hours and remote health monitoring, the ZRE achieves ≥95% data capture rate over quarterly reporting cycles, as verified in field deployments exceeding 18 months.
Is field calibration possible without specialized tools?

All calibration functions are accessible via the front-panel interface or Web GUI; only certified span gases (ISO 6141-compliant) and a calibrated pressure gauge are required — no proprietary service tools needed.
How is moisture interference mitigated in wet flue gas streams?

The NDIR modules employ spectral water-vapor compensation algorithms trained on >500 reference spectra; additionally, optional chilled-mirror dew point control maintains sample dew point <5 °C prior to analysis.
Does the system support integration with existing plant DCS or EMS platforms?

Standard 4–20 mA/HART outputs are provided; optional gateways enable native communication with Siemens Desigo, Honeywell Experion, Yokogawa CENTUM VP, and Schneider EcoStruxure platforms via Modbus TCP or OPC UA.