Huayun Instruments GXH-3011 Series NDIR Multicomponent Gas Analyzer

Overview

The Huayun Instruments GXH-3011 Series NDIR Multicomponent Gas Analyzer is an online, fixed-mount analytical instrument engineered for continuous, real-time quantification of carbon monoxide (CO), carbon dioxide (CO₂), and methane (CH₄) in industrial and environmental process streams. It operates on the physical principle of non-dispersive infrared (NDIR) absorption spectroscopy—where target gas molecules absorb specific mid-infrared wavelengths corresponding to their molecular vibrational modes. The analyzer employs Gas Filter Correlation (GFC) optical architecture, which enhances spectral selectivity by using reference and measurement gas cells within the optical path to suppress interference from overlapping absorptions (e.g., water vapor or other hydrocarbons). This design delivers high specificity without mechanical choppers or moving gratings, contributing to long-term baseline stability and reduced maintenance intervals. Unlike single-beam or broadband filter-based NDIR systems, GFC enables robust discrimination even in complex matrices typical of flue gas, biogas upgrading, landfill monitoring, or chemical reactor off-gas applications.

Key Features

• GFC-based optical module with dual-path correlation detection for enhanced interference rejection and improved signal-to-noise ratio
• Configurable multi-gas capability: simultaneous or sequential analysis of CO, CO₂, and CH₄ with independent range selection (ppm-level trace to %-level bulk concentration)
• Fast response performance: T₀–T₉₀ ≤ 15 seconds from sample gas entry at the inlet port, supporting dynamic process control loops
• High metrological integrity: repeatability ≤ ±1% full scale (FS), linearity error ≤ ±2% FS, zero and span drift ≤ ±2% FS over 72 hours under specified operating conditions
• Industrial-grade enclosure compliant with IP54 ingress protection (when installed with optional cabinet); designed for wall- or rack-mount deployment in control rooms or field shelters
• Standard 4–20 mA isolated analog output with HART protocol support (optional), compatible with DCS, PLC, and SCADA systems for seamless integration into plant-wide automation infrastructure
• Low power consumption (<150 W) and wide-input AC supply tolerance (220 VAC ±10%, 50 Hz ±10%) ensure operational resilience in fluctuating utility environments

Sample Compatibility & Compliance

The GXH-3011 is validated for use with dry, non-corrosive gas samples containing particulate loadings < 1 µm and dew point < 5 °C. For wet or contaminated streams, optional sample conditioning systems—including particulate filtration, condensate removal, and pressure regulation—are available as part of the complete system package. All calibration and verification procedures align with JJG 635–2011 (“Verification Regulation for Infrared Carbon Monoxide and Carbon Dioxide Gas Analyzers”) and enterprise standard Q/HDHYU0003–2013. While not certified to IEC 61508 or ATEX for hazardous area installation, the analyzer meets electromagnetic compatibility (EMC) requirements per GB/T 18268.1–2010 (equivalent to IEC 61326–1) and safety specifications per GB 4793.1–2007 (IEC 61010–1). It supports GLP-compliant operation when paired with audit-trail-enabled data logging software and calibrated reference gases traceable to NIM (National Institute of Metrology, China).

Software & Data Management

The analyzer operates autonomously without embedded PC hardware but interfaces via RS-232/RS-485 or optional Ethernet port for remote configuration, diagnostics, and data acquisition. Huayun’s proprietary PC-based configuration utility provides access to zero/span calibration routines, alarm threshold setting, analog output scaling, and diagnostic logs (including lamp intensity, detector voltage, and temperature-compensated gain values). Raw concentration outputs and status flags are timestamped and exportable in CSV format. When integrated into a centralized monitoring platform, the device supports Modbus RTU/TCP protocols for bidirectional communication. All firmware updates are delivered via signed binary packages with version-controlled release notes, ensuring traceability during regulatory audits. Data integrity safeguards include write-protected memory for calibration coefficients and automatic event logging of power cycles, sensor faults, and out-of-specification readings.

Applications

• Continuous emission monitoring (CEMS) for CO and CO₂ in thermal power plant flue gas, complying with national pollutant discharge standards
• Biogas quality control in anaerobic digestion facilities—real-time tracking of CH₄ enrichment and CO₂ scrubbing efficiency
• Safety interlock systems in enclosed industrial spaces (e.g., battery charging rooms, refrigeration plants) where CO accumulation poses acute toxicity risk
• Process optimization in syngas production, methanol synthesis, and catalytic reforming units requiring precise stoichiometric feedback
• Landfill gas collection network management, including flare efficiency assessment and fugitive emission quantification
• Environmental research stations conducting long-term atmospheric composition studies in urban or peri-urban zones

FAQ

What gases can the GXH-3011 Series measure simultaneously?
It is configured for CO, CO₂, and CH₄—either individually or in any combination. Additional gases (e.g., SO₂, NO) require hardware modification and are not supported in standard configurations.
Is the analyzer suitable for outdoor installation?
The base unit is rated for indoor use only. Outdoor deployment requires integration into a climate-controlled, NEMA 4X-rated cabinet with integrated sample conditioning and power conditioning.
Does it support automatic zero and span calibration?
Yes—via external solenoid valves and certified calibration gases. Manual initiation is required; fully autonomous calibration cycles are not implemented.
Can it be used in explosive atmospheres?
No. The GXH-3011 does not carry intrinsic safety (IS) or explosion-proof (Ex d) certification and must be installed in non-hazardous classified areas.
What maintenance intervals are recommended?
Optical path inspection and detector cleaning every 6 months; IR source replacement every 24 months; annual full verification against traceable standards per JJG 635–2011.