Huayun GXH-3010/3011BF Portable NDIR CO and CO₂ Analyzer

Overview

The Huayun GXH-3010/3011BF Portable NDIR CO and CO₂ Analyzer is a field-deployable, dual-gas infrared gas analyzer engineered for high-fidelity measurement of carbon monoxide (CO) and carbon dioxide (CO₂) in ambient air, indoor environments, occupational settings, and environmental monitoring applications. It operates on the principle of non-dispersive infrared (NDIR) spectroscopy — leveraging distinct absorption bands at 4.6 µm (CO) and 4.26 µm (CO₂) to enable selective, interference-resistant quantification without optical dispersion elements. The instrument integrates an internal sampling pump with regulated flow control (0.5–1.2 L/min), ensuring consistent sample delivery across variable pressure and humidity conditions. Designed for regulatory compliance and routine field use, it meets the metrological requirements of Chinese national standards GB/T 18204.2–2014, GBZ/T 300.37–2017, GB/T 9801–1988, and HJ 965–2018, and conforms to JJG 635–2011 verification procedures for infrared gas analyzers. Its certified Class II accuracy enables traceable calibration and supports issuance of secondary-level metrological verification certificates from provincial metrology institutes or the National Institute of Metrology (NIM), China.

Key Features

• Integrated NDIR optical module with dual-channel detection architecture for simultaneous CO and CO₂ measurement
• Internal zero-calibration filter and one-touch auto-zero function, eliminating manual span gas dependency for routine field operation
• High-resolution color touchscreen interface with intuitive menu navigation and real-time unit conversion (ppm → mg/m³ at standard conditions)
• Onboard data storage capacity for up to 30,000 measurement records, timestamped and tagged with environmental metadata
• Configurable averaging modes: selectable hourly and daily mean calculation for compliance reporting (e.g., workplace exposure limit assessment per GBZ 2.1)
• Expandable functionality via optional Bluetooth thermal printer module for immediate field documentation
• Robust portable design: dimensions 286 × 255 × 92 mm; weight ≤5.3 kg; powered by rechargeable Li-ion battery or AC adapter (220 VAC ±10%)
• USB dual-interface support (Type-A and Type-B) for direct U-disk data export and PC-based firmware/software updates

Sample Compatibility & Compliance

The GXH-3010/3011BF is validated for use with ambient air, indoor air, flue gas dilutions (with appropriate probe filtration), and workplace breathing-zone samples. It accommodates particulate-laden or moderately humid streams through its built-in particulate filter and condensate trap. Cross-sensitivity to common interferents has been characterized per JJG 635–2011: CO interference remains ≤±0.3% FS at 1250 mg/m³ CO background, confirming robust selectivity under realistic field conditions. The analyzer satisfies metrological traceability requirements for GLP-aligned environmental testing laboratories and supports audit-ready documentation when used in conjunction with calibrated reference gases (certified to ISO 6141). While not intrinsically rated for hazardous area use (e.g., ATEX/IECEx), it complies with EMC directive 2014/30/EU and low-voltage directive 2014/35/EU for CE-marked deployment in non-explosive environments.

Software & Data Management

Data acquisition and post-processing are supported via proprietary Windows-compatible software, enabling batch download, spectral review, calibration log management, and PDF report generation compliant with GB/T 27417–2017 guidelines for uncertainty evaluation. All stored measurements include embedded timestamps, instrument serial number, battery status, and user-defined site identifiers. Audit trail functionality records operator-initiated events (zeroing, calibration, configuration changes) with immutable timestamps — aligning with basic data integrity expectations under GLP frameworks. Firmware supports over-the-air updates via USB, and configuration files (e.g., custom range scaling, averaging intervals) can be imported/exported for fleet-wide consistency. Raw data exports are provided in CSV format, facilitating integration into LIMS or third-party statistical analysis platforms.

Applications

• Indoor air quality (IAQ) surveys in offices, schools, and public buildings per GB/T 18883–2022
• Occupational hygiene monitoring for CO and CO₂ exposure assessment in industrial facilities, garages, and boiler rooms
• Environmental ambient air monitoring at urban roadside, landfill perimeters, and near combustion sources
• Validation of HVAC system performance and demand-controlled ventilation (DCV) logic
• Field verification of fixed-site continuous emission monitoring systems (CEMS) during periodic audits
• Research-grade spot sampling in ecological studies involving soil respiration or urban carbon flux estimation

FAQ

What is the recommended calibration frequency for routine field use?
For compliance-critical applications, calibration verification using certified span gases is advised before each measurement session; full two-point calibration (zero + span) should be performed at least once per week or after transport-induced shock.
Can the instrument measure CO and CO₂ simultaneously in real time?
Yes — both gases are measured concurrently with independent optical channels and synchronized sampling, delivering paired concentration values at 1-second intervals.
Is the device suitable for outdoor use in sub-zero temperatures?
The specified operating temperature range is 10–45°C; extended cold-weather operation below 10°C may affect zero stability and response time, and is not covered under warranty or metrological certification.
Does the analyzer support remote data transmission via cellular or Wi-Fi?
No — the GXH-3010/3011BF does not feature built-in telemetry; data transfer is limited to local USB and optional Bluetooth printing.
How is traceability maintained for measurement results?
Traceability is established through factory calibration against NIM-traceable reference gases, documented in the Certificate of Conformity; users must retain calibration gas certificates and instrument verification reports for audit purposes.