Ailun AL-3019A NDIR Carbon Dioxide Analyzer

Overview

The Ailun AL-3019A NDIR Carbon Dioxide Analyzer is a portable, field-deployable gas detection instrument engineered for precise, real-time measurement of carbon dioxide (CO₂) concentration in ambient air, indoor environments, occupational settings, and fixed emission sources. It operates on the principle of non-dispersive infrared (NDIR) absorption spectroscopy — a well-established, interference-resistant optical method wherein CO₂ molecules selectively absorb infrared radiation at a characteristic wavelength near 4.26 µm. The analyzer employs a dual-beam optical architecture with a reference detector and an active measurement channel, enabling high stability against environmental fluctuations and long-term baseline integrity. Its design complies fully with national standards including GB/T 18204.2–2014 (Public Health Inspection Methods), GBZ/T 300.37–2017 (Workplace Air Toxic Substance Determination), HJ 870–2017 (CO₂ Emission Monitoring from Stationary Sources), and JJG 635–2011 (National Verification Regulation for CO/CO₂ Infrared Gas Analyzers). As a Class II certified instrument per Chinese metrological requirements, it supports traceable calibration and is eligible for official verification certificates issued by the National Institute of Metrology (NIM), P.R. China.

Key Features

• Integrated NDIR optical module with temperature-stabilized IR source and pyroelectric detector for consistent spectral sensitivity
• Internal sampling pump with adjustable flow control (0.5–1.0 L/min) ensuring representative sample draw under variable pressure conditions
• Automated zero calibration via built-in zero-filter and six-port valve switching — eliminating manual gas cylinder dependency
• Multi-timescale averaging: configurable display and storage of hourly, 8-hour, and daily mean CO₂ concentrations
• Dual-unit output: simultaneous % vol and mg/m³ readings (with automatic density correction at user-defined temperature and pressure)
• Extended data logging: onboard memory stores up to 10,000 timestamped measurements with UTC synchronization
• USB interface with dedicated PC software for raw data export, trend visualization, and audit-ready report generation
• Optional Bluetooth thermal printer for immediate field documentation (IEEE 802.15.1 compliant)
• Robust mechanical housing (IP54-rated enclosure), ergonomic carry case, and <2 kg mass optimized for extended handheld operation

Sample Compatibility & Compliance

The AL-3019A is validated for direct analysis of undiluted ambient air, workplace breathing-zone samples, HVAC duct streams, and flue gas effluents (within specified moisture and particulate limits). It demonstrates negligible cross-sensitivity to CO (<±0.3% FS at 1250 mg/m³), methane, and common hydrocarbons due to narrow-band optical filtering and signal compensation algorithms. The instrument meets Class II performance criteria defined in JJG 635–2011, including repeatability (≤1% FS), zero drift (≤±2% FS/h), span drift (≤±2% FS/3 h), and temperature-induced error (≤±2% FS/10°C across 10–45°C). All factory calibrations are traceable to NIM-certified standard gases. While not inherently 21 CFR Part 11 compliant, its data export architecture supports integration into GLP/GMP-aligned QA workflows when paired with validated third-party data management systems.

Software & Data Management

Data acquisition and post-processing are supported through Windows-compatible desktop software delivered on included USB drive. The application enables real-time graphing, statistical summary (min/max/mean/stdev), CSV export with ISO 8601 timestamps, and customizable PDF report templates. Each stored record includes instrument ID, operator tag, GPS coordinates (if connected via external Bluetooth GNSS module), and environmental metadata (T/P/RH if optional sensors are installed). Audit trails are maintained via immutable log files; no data overwrite or deletion is permitted during active logging. Firmware updates are performed via USB without requiring service center intervention. Raw analog output (0–5 V or 4–20 mA) is available upon request for SCADA or BMS integration.

Applications

• Indoor air quality (IAQ) assessment in offices, schools, hospitals, and museums per ASHRAE 62.1 and EN 13779 guidelines
• OCCUPATIONAL HYGIENE monitoring in confined spaces, laboratories, fermentation facilities, and greenhouses
• Regulatory compliance testing for CO₂ emissions from boilers, incinerators, and biogas upgrading units (aligned with HJ 870–2017)
• Educational demonstrations of gas kinetics, respiration studies, and environmental science curricula
• Field validation of fixed continuous emission monitoring systems (CEMS) as a portable reference analyzer
• Building automation system (BAS) commissioning and demand-controlled ventilation (DCV) optimization

FAQ

What is the recommended calibration frequency for routine use?
Annual verification against NIM-traceable standard gas is required for metrological compliance; field zero checks before each measurement session are strongly advised.

Can the instrument measure CO₂ in high-humidity samples?
Yes — condensate is removed via integrated hydrophobic membrane filter; however, prolonged exposure to >90% RH may require optional heated sampling line.

Is the AL-3019A suitable for measuring CO₂ in pure nitrogen or argon backgrounds?
No — NDIR relies on differential absorption against ambient background; matrix-specific calibration is required for inert carrier gases.

Does the device support external trigger inputs for synchronized sampling?
Not natively; however, TTL-level start/stop signals can be implemented via custom firmware update upon technical agreement.

How is data integrity ensured during power interruption?
All measurements are written to non-volatile flash memory prior to display; unsaved data buffers are retained across battery swaps and AC loss.