GXH-3010F Portable NDIR Carbon Dioxide Analyzer (Discontinued)

Overview

The GXH-3010F Portable NDIR Carbon Dioxide Analyzer is a discontinued but technically representative handheld gas analyzer engineered for field-deployable, real-time quantification of carbon dioxide (CO₂) in ambient air and controlled environments. It operates on the principle of non-dispersive infrared (NDIR) absorption spectroscopy—where CO₂ molecules exhibit strong, characteristic absorption bands near 4.26 µm. A broadband IR source emits radiation through a sample chamber; a dual-wavelength detector compares absorption at the CO₂-specific wavelength against a reference wavelength to compute concentration via the Beer–Lambert law. This optical architecture ensures high selectivity for CO₂ with minimal cross-sensitivity to common atmospheric gases such as CO, CH₄, or water vapor (when equipped with integrated desiccant filtration). Designed for compliance with GB/T 18204.24–2000 (Method for Determination of Carbon Dioxide in Public Place Air) and JJG 635–1999 (Verification Regulation for CO/CO₂ Infrared Gas Analyzers), the instrument delivers metrologically traceable measurements suitable for regulatory reporting, occupational health assessments, and environmental baseline surveys.

Key Features

• True portable form factor: Compact housing (248 × 185 × 85 mm), mass ≤3 kg, enabling extended battery-powered operation during site inspections, indoor air quality audits, or mobile lab deployments.
• Pump-assisted sampling system ensures consistent flow rate and eliminates diffusion-limited measurement bias—critical for rapid equilibration in dynamic environments such as HVAC ducts, greenhouses, or animal housing facilities.
• Digital zero calibration via external particulate filter—eliminates manual optical alignment and supports field recalibration without requiring certified span gases.
• Two standard full-scale ranges (0–5000 ppm and 0–10000 ppm CO₂) optimized for indoor air quality (IAQ) monitoring and industrial hygiene applications, respectively.
• Real-time digital display with 1-second update interval and built-in data hold function for spot-check documentation.
• Robust mechanical design compliant with IP54 ingress protection standards for dust and splash resistance during outdoor or industrial use.

Sample Compatibility & Compliance

The GXH-3010F is validated for direct analysis of ambient air, ventilation exhaust streams, fermentation headspace, and storage atmospheres (e.g., grain silos, fruit cold rooms). Its NDIR detection cell incorporates hydrophobic particulate filtration to mitigate interference from aerosols and condensable organics. While not intrinsically rated for hazardous area use (e.g., ATEX or IECEx), it meets electromagnetic compatibility (EMC) requirements per GB/T 18204.24–2000 Annex B and adheres to basic safety provisions outlined in GB 4793.1–2007 (Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use). Calibration traceability aligns with national metrological standards maintained by provincial institutes of metrology in China. For GLP/GMP-aligned workflows, optional RS232 output supports integration into validated data logging systems with audit trail capability.

Software & Data Management

An optional Windows-compatible data acquisition software package enables time-stamped serial logging (via RS232), configurable averaging intervals (1–60 s), and export to CSV or Excel formats. The software includes basic statistical functions—min/max/mean calculation, trend plotting, and alarm threshold configuration (user-definable upper/lower limits). When deployed with external temperature or O₂ sensors (per customization notes), the software synchronizes multi-parameter records for comprehensive atmospheric profiling. All firmware revisions and calibration logs are retained locally within device memory for post-hoc verification—a requirement under ISO/IEC 17025–2017 clause 7.7 (Control of Records).

Applications

• Indoor Air Quality (IAQ) assessment in schools, offices, hospitals, and public transport hubs per ASHRAE Standard 62.1 and WHO air quality guidelines.
• Respiratory metabolism studies in clinical and physiological laboratories using closed-circuit rebreathing protocols.
• Controlled atmosphere (CA) storage monitoring for apples, pears, and potatoes—where CO₂ levels between 1–5% (10,000–50,000 ppm) directly impact shelf life and spoilage kinetics.
• Soil respiration flux estimation when coupled with a stainless-steel soil probe assembly (custom configuration), supporting carbon cycle research in agricultural and ecological field studies.
• Leaf-level photosynthetic gas exchange measurements when interfaced with a standard leaf chamber—enabling stomatal conductance and net assimilation rate derivation under variable light and humidity conditions.

FAQ

Is the GXH-3010F still supported with spare parts or calibration services?
No—production was formally discontinued. Limited legacy calibration certificates may be available upon request for existing units, but no new firmware updates or hardware repairs are offered.
Can this analyzer measure CO₂ in high-humidity environments?
Yes, provided the optional desiccant filter is installed and replaced regularly. Uncompensated water vapor above 90% RH may cause temporary signal drift due to spectral overlap near 2.7 µm.
Does the instrument comply with FDA 21 CFR Part 11 for electronic records?
No—the base unit lacks electronic signature capability, audit trail generation, or user access controls. Compliance requires third-party validated data acquisition software with 21 CFR Part 11 add-ons.
What is the typical service life of the internal IR source and detector?
Under normal usage (≤4 hrs/day), the thermopile detector and micro-filament IR source maintain stable responsivity for ≥5 years before requiring replacement.
Is factory recalibration required annually?
Per JJG 635–1999, verification interval is 12 months. Field zero calibration using clean ambient air (verified <50 ppm CO₂) is recommended before each daily use session.