Huayun Instruments GXH-3010E1 Portable NDIR Carbon Dioxide Analyzer

Overview

The Huayun Instruments GXH-3010E1 is a portable, single-component carbon dioxide (CO₂) analyzer engineered for field-deployable, high-reliability environmental and occupational air quality monitoring. It employs non-dispersive infrared (NDIR) spectroscopy — a well-established, interference-resistant optical absorption technique — to quantify CO₂ concentration in ambient, indoor, or stack gas samples. The instrument operates on the principle that CO₂ molecules exhibit strong, characteristic absorption bands near 4.26 µm; the GXH-3010E1 utilizes a broadband infrared source, precision optical filters, and a thermopile detector to measure absorbance intensity, converting it into a calibrated volumetric concentration output (expressed as % v/v or mg/m³). Designed for compliance with national regulatory frameworks, the analyzer meets GB/T 18204.2–2014 (public health environments), GBZ/T 300.37–2017 (workplace air toxicants), HJ 870–2017 (fixed-source flue gas CO₂), and JJG 635–2011 (national metrological verification for IR gas analyzers). Its performance parameters satisfy Class II accuracy requirements defined in Chinese national standards, enabling traceable calibration and formal certification by the National Institute of Metrology (NIM) upon request.

Key Features

• Integrated NDIR optical module with temperature-stabilized detector and dual-beam reference compensation for enhanced long-term stability.
• Internal sampling pump with adjustable flow control (0.5–1.0 L/min), ensuring consistent sample delivery across variable backpressure conditions.
• Automated zero calibration system using an onboard catalytic CO₂ scrubber filter and six-port solenoid valve — enabling rapid, operator-initiated zero adjustment without external gas cylinders.
• Configurable display units: % v/v, ppm, or mg/m³ — with automatic density correction based on user-input temperature and pressure (optional).
• Extended data logging: Stores up to 5,000 timestamped measurement records internally; exportable via USB interface using certified Windows-compatible software.
• Robust portable architecture: IP54-rated enclosure, lithium-ion battery supporting ≥4 hours continuous operation, and lightweight design (<2.0 kg) optimized for handheld or tripod-mounted deployment.
• Optional firmware upgrades include real-time averaging (user-selectable time windows), one-touch auto-zero initiation, and custom range extension (e.g., 0–1.000% CO₂) upon factory configuration.

Sample Compatibility & Compliance

The GXH-3010E1 is validated for direct analysis of dry or moderately humid air samples (dew point ≤10°C) without condensation. It exhibits minimal cross-sensitivity to common atmospheric gases: CO interference is limited to ≤±0.3% full scale at 1250 mg/m³, and no significant response is observed for CH₄, SO₂, NO₂, or H₂O vapor within typical ambient ranges. The analyzer complies with metrological traceability requirements under JJG 635–2011 and supports GLP-aligned documentation workflows. While not intrinsically safe for Zone 0/1 hazardous areas, its design conforms to electromagnetic compatibility (EMC) standards GB/T 18268.1–2010 and safety standard GB 4793.1–2007. For regulated applications requiring audit-ready data integrity, optional software enables electronic signatures, user access levels, and 21 CFR Part 11–compliant audit trails when paired with validated PC systems.

Software & Data Management

Data acquisition and post-processing are managed through Huayun’s proprietary USB-connected desktop application, compatible with Windows 10/11. The software provides real-time graphing, statistical summary (min/max/mean/std dev), batch export to CSV or PDF, and customizable report templates aligned with GB/T 18204.2 reporting formats. All stored measurements retain embedded metadata: date/time stamp, instrument serial number, battery voltage, flow rate, and calibration status flags. Firmware updates are delivered via signed binary packages, preserving cryptographic integrity. Raw spectral diagnostics and sensor health logs are accessible for technical review during preventive maintenance or QA audits.

Applications

• Indoor air quality (IAQ) assessment in offices, schools, hospitals, and residential buildings per GB/T 18883–2002.
• Workplace exposure monitoring for CO₂ in confined spaces, fermentation facilities, breweries, and cold storage operations.
• Environmental compliance checks for CO₂ emissions from small-scale combustion sources, biogas upgrading units, or HVAC ducts.
• Field validation of fixed continuous emission monitoring systems (CEMS) and calibration verification of diffusion-based sensors.
• Educational use in environmental science laboratories for teaching gas-phase quantitative spectroscopy and regulatory sampling protocols.

FAQ

Does the GXH-3010E1 require external zero gas for calibration?
No — it features an integrated catalytic CO₂ scrubber and automated six-port valve for internal zero calibration using ambient air, eliminating dependency on bottled zero gas.

Can the instrument measure CO₂ in high-humidity environments?
It is rated for use at dew points up to 10°C; for saturated or condensing conditions, a Nafion™ dryer or chilled mirror pre-conditioner is recommended upstream of the inlet.

Is firmware update capability included?
Yes — updates are distributed via USB and require administrator-level authentication; version history and change logs are maintained in device memory.

What documentation is provided for metrological traceability?
Each unit ships with a factory calibration certificate referencing NIM-traceable standards; optional NIM on-site verification or accredited third-party calibration services are available upon request.

How is data security ensured during USB transfer?
The software implements role-based access control, encrypted local storage of calibration parameters, and write-protected configuration files to prevent unauthorized modification of critical measurement settings.