HUANKONG GHK2300 Infrared Multi-Gas Emission Analyzer for NOx, SO₂, CO₂, CO, H₂S, O₂, CH₄ and N₂O

Overview

The HUANKONG GHK2300 Infrared Multi-Gas Emission Analyzer is an industrial-grade, portable stack emission monitoring system engineered for accurate, real-time quantification of gaseous pollutants in flue gas streams from stationary sources. It operates on the principle of non-dispersive infrared (NDIR) absorption spectroscopy — a well-established, reference-grade methodology standardized under multiple Chinese environmental regulatory protocols including HJ692-2014 (NO_x), HJ629-2011 (SO₂), and HJ870-2017 (CO₂). Unlike single-gas analyzers, the GHK2300 simultaneously measures up to eight key constituents: nitrogen oxides (NO and NO₂, reported as NO_x), sulfur dioxide (SO₂), carbon dioxide (CO₂), carbon monoxide (CO), hydrogen sulfide (H₂S), oxygen (O₂), methane (CH₄), and nitrous oxide (N₂O). Its design targets compliance-driven applications in environmental inspection agencies, thermal power plants, cement kilns, waste incinerators, and industrial boiler operations where trace-level accuracy, long-term stability, and field robustness are mandatory.

Key Features

• Integrated tri-functional probe: Combines Pitot tube (rotatable for optimal alignment), heated gas sampling tube, and inline pre-conditioner — minimizing transport losses and enabling simultaneous velocity, temperature, and concentration measurements.
• Dual-stage moisture management: Semiconductor thermoelectric cooler paired with hydrophobic membrane dryer ensures ≤10% water-soluble gas loss (e.g., SO₂, NH₃) while maintaining dew point 15% v/v).
• Titanium alloy sampling tube: Corrosion-resistant, non-catalytic, low-adsorption inner conduit rated to 200 °C continuous duty; eliminates cross-contamination and preserves reactive species integrity during transit.
• Intelligent humidity safeguard: Built-in capacitive humidity sensor triggers automatic shutdown when stack moisture exceeds instrument tolerance — preventing optical window condensation and sensor drift.
• Four-in-one cable assembly: Consolidates thermocouple signal (smoke temperature), RS232/RS485 communication, DC power, and conditioned sample gas into a single armored cable with quick-connect fittings — reducing field setup time by >40%.
• EMC-hardened architecture: Meets IEC 61326-1 Class A immunity requirements; includes galvanic isolation, multi-layer PCB shielding, and ESD-protected front panel — validated for operation near VFDs, SCR systems, and electrostatic precipitators.

Sample Compatibility & Compliance

The GHK2300 is designed for direct insertion into ducts and stacks with diameters ≥150 mm and flue gas temperatures up to 200 °C. It accommodates particulate loadings ≤100 mg/m³ without filter clogging, thanks to its integrated cyclonic dust separator and self-cleaning optical path design. All measurement algorithms adhere to the linearity, zero/span stability, and interference rejection criteria specified in HJ/T397-2007 for field-deployed emission analyzers. The system supports audit-ready data logging per GLP-aligned practices: each stored record contains timestamp, GPS coordinates (when enabled), operator ID, calibration history, and raw spectral absorbance values. Full traceability is maintained through configurable audit trails compliant with ISO/IEC 17025 documentation requirements.

Software & Data Management

The embedded firmware provides dual-mode operation: standalone field mode (touchscreen GUI with intuitive workflow navigation) and PC-connected mode (via USB or Bluetooth) for advanced configuration and report generation. Internal memory stores ≥12 months of minute-averaged data (time-stamped, with QA/QC flags). Data export is supported via FAT32-formatted USB drives in CSV and PDF formats — compatible with national emission reporting platforms (e.g., China’s National Emission Permit Management Information Platform). Optional IoT firmware enables MQTT-based transmission to private or public cloud servers, supporting TLS 1.2 encryption and device authentication via X.509 certificates. Remote diagnostics, over-the-air updates, and alarm-triggered SMS/email notifications are configurable through the web-based fleet management portal.

Applications

• Regulatory stack testing per HJ/T397-2007 and local environmental bureau mandates
• CEMS performance verification and QA/QC auditing of continuous emission monitoring systems
• Combustion efficiency optimization in coal-fired and biomass boilers via O₂/CO/CO₂ balance analysis
• De-NO_x system evaluation (SCR/SNCR) using differential NO_x profiles across catalyst beds
• Greenhouse gas inventory support (CO₂, CH₄, N₂O) aligned with IPCC Tier 2 methodologies
• Process troubleshooting in petrochemical cracking units and sulfur recovery trains (H₂S, SO₂, CO)

FAQ

Does the GHK2300 require daily calibration? Why or why not?

No. The analyzer employs dual-beam NDIR optics with sealed reference cells and temperature-compensated detectors, enabling stable baseline performance for ≥7 days between span checks. Zero calibration is recommended before each field deployment; span calibration is required every 72 hours for regulatory audits per HJ/T397-2007.
Can it measure NO and NO₂ separately, or only as total NO_x?

The GHK2300 reports NO_x as the sum of NO and NO₂ concentrations. It does not include chemiluminescence or catalytic conversion modules for speciated NO/NO₂ differentiation — consistent with HJ692-2014’s total NO_x reporting requirement for stack compliance.
Is the built-in battery certified for air transport?

Yes. The lithium-ion pack complies with UN38.3 and IATA PI 965 Section II requirements, including thermal runaway mitigation and state-of-charge limitation to ≤30% for shipping.
What is the minimum detectable concentration for SO₂ under field conditions?

At 1 Hz sampling rate and with dual-stage drying active, the practical limit of detection is 2 ppm (v/v) for SO₂ — verified against NIST-traceable calibration gases and meeting HJ629-2011 sensitivity thresholds.
How is data integrity ensured during power interruption?

All measurements are written to non-volatile flash memory with atomic write operations. Power-loss recovery resumes logging from the last committed record without data corruption or timestamp gaps.