Huayun Instruments GXH-3011 Online NDIR Multicomponent Gas Analyzer
| Brand | Huayun Instruments |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | Direct Manufacturer |
| Product Type | Online Analyzer |
| Measurement Principle | Non-Dispersive Infrared (NDIR) Absorption |
| Response Time | T₀–T₉₀ ≤ 15 s (from sample gas entry) |
| Repeatability | ≤ ±1% FS for CO, CO₂, CH₄, NO, SO₂, NH₃ |
| Linearity Error | ≤ ±2% FS |
| Zero Drift | ≤ ±2% FS / 72 h |
| Span Drift | ≤ ±2% FS / 72 h |
| Measurement Ranges | CO (0–500 ppm), CO₂ (0–500 ppm), CH₄ (0–1000 ppm), configurable up to 0–100.0% vol |
| Output Signal | 4–20 mA analog |
| Power Supply | 220 VAC ±10%, 50 Hz ±10% |
| Dimensions | 436 × 426 × 133 mm (L×W×H, excluding protrusions) |
| Weight | ≤10 kg |
| Operating Temperature | 5–45 °C |
| Relative Humidity | ≤80% RH (non-condensing) |
| Environmental Requirements | Non-corrosive atmosphere, airflow ≤0.5 m/s, horizontal mounting, vibration-free installation |
Overview
The Huayun Instruments GXH-3011 is an online, real-time multicomponent gas analyzer engineered for continuous industrial and environmental monitoring applications. It operates on the principle of Non-Dispersive Infrared (NDIR) absorption spectroscopy — a well-established, physics-based method where target gases exhibit characteristic absorption bands in the mid-infrared region. The instrument employs Gas Filter Correlation (GFC) optical architecture, which enhances spectral selectivity by using matched reference and measurement gas cells, effectively suppressing cross-interference from overlapping absorptions (e.g., H₂O vapor or CO₂ in CH₄ analysis). This design ensures high specificity for CO, CO₂, CH₄, NO, SO₂, and NH₃ without reliance on chemical reagents or consumables. Unlike extractive benchtop analyzers, the GXH-3011 is configured for direct in-line or sidestream sampling, supporting uninterrupted operation over extended periods in demanding environments such as stack emissions monitoring, biogas upgrading facilities, landfill gas recovery systems, and chemical process control loops.
Key Features
- Gas Filter Correlation (GFC) optical path — delivers superior interference rejection and long-term baseline stability, critical for unattended field deployment
- Configurable multi-gas capability: simultaneous or sequential analysis of up to six infrared-active gases within a single platform
- Fast dynamic response: T₀–T₉₀ ≤ 15 seconds from sample gas entry, enabling timely detection of concentration transients in process streams
- High metrological integrity: compliant with JJG 635–2011 (PRC National Verification Regulation for CO/CO₂ Infrared Analyzers) and enterprise standard Q/HDHYU0003–2013
- Ruggedized industrial enclosure (IP54-rated front panel) with modular internal layout — supports field replacement of optical modules and electronics without recalibration
- Low maintenance footprint: no moving parts in the optical train; no consumable filters or catalytic scrubbers required for standard operation
- Integrated temperature and pressure compensation algorithms — corrects for ambient and sample condition variations per ISO 12039 and ASTM D6522 guidelines
Sample Compatibility & Compliance
The GXH-3011 accepts conditioned sample gas streams across a wide range of compositions and physical states. It is compatible with dry or moderately humid samples (≤80% RH, non-condensing), and may be integrated with optional external sample conditioning systems — including particulate filtration (0.3 µm), moisture removal (chiller or permeation dryer), and flow regulation — to meet ISO 14644 cleanroom air standards or EPA Method 3A requirements for stack gas analysis. The analyzer’s gas handling path is constructed from electropolished 316 stainless steel and PTFE-lined components, ensuring chemical inertness toward acidic (SO₂, NOₓ), basic (NH₃), and hydrocarbon (CH₄) species. All electrical interfaces conform to IEC 61000-4 immunity standards and intrinsic safety options (Ex d IIB T4) are available upon request for Zone 1 hazardous area installations. Calibration traceability is maintained via NIST-traceable span gases, and verification procedures align with GLP-compliant audit trails for regulated industries.
Software & Data Management
The GXH-3011 includes embedded firmware with dual-mode communication: isolated 4–20 mA analog outputs (fully linearized and temperature-compensated) and RS-485 Modbus RTU digital interface for integration into SCADA, DCS, or PLC networks. Optional Ethernet/IP or Profibus-DP modules support higher-level data aggregation. Local configuration and diagnostics are accessible via a backlit 4.3-inch TFT LCD touchscreen with intuitive menu navigation. Firmware supports user-defined alarm thresholds (high/low, rate-of-change), event logging (timestamped zero/span events, fault codes), and automatic drift correction cycles. Data export is enabled via USB flash drive in CSV format, compatible with LIMS and EPA-compliant reporting tools. While the base unit does not include FDA 21 CFR Part 11-compliant electronic signatures, optional audit trail firmware upgrades provide full electronic record retention, role-based access control, and change history — meeting GMP Annex 11 and ISO/IEC 17025 documentation requirements.
Applications
- Continuous emission monitoring systems (CEMS) for thermal power plants, waste incinerators, and cement kilns
- Biogas quality control in anaerobic digestion plants (CH₄/CO₂ ratio optimization for grid injection)
- Industrial hygiene and workplace exposure monitoring (CO, NH₃, SO₂ in refineries and fertilizer plants)
- Landfill gas collection system management (real-time CH₄ oxidation efficiency assessment)
- Controlled atmosphere storage (CAS) and modified atmosphere packaging (MAP) validation in food processing
- Research-grade gas flux studies in environmental chambers and eddy covariance setups
FAQ
What gases can the GXH-3011 measure simultaneously?
The analyzer is factory-configured for up to six infrared-active gases (e.g., CO, CO₂, CH₄, NO, SO₂, NH₃); specific combinations are selected at order stage based on optical filter set and calibration protocol.
Is external sample conditioning mandatory?
Not always — but strongly recommended for wet, dusty, or high-particulate streams. The standard unit assumes pre-conditioned gas (filtered, dried, and pressure-regulated to 0.8–1.2 bar). Optional integrated pre-treatment skids are available.
How often does the instrument require calibration verification?
Per JJG 635–2011, initial verification is required before commissioning; subsequent checks are recommended every 3–6 months depending on application severity and regulatory jurisdiction (e.g., quarterly for EU IED compliance).
Can the GXH-3011 be integrated into an existing DCS environment?
Yes — via native 4–20 mA outputs or optional Modbus TCP/EtherNet/IP gateways. Engineering drawings and device description files (EDS/GSD) are supplied for seamless DCS tag mapping.
Does the analyzer support remote diagnostics and firmware updates?
Remote parameter readout and alarm status monitoring are supported via Modbus. Over-the-air firmware updates require local physical access due to cybersecurity requirements under IEC 62443-3-3 Level 1.
