Junray ZR-3320 Portable NDIR CO/CO₂ Analyzer

Overview

The Junray ZR-3320 Portable NDIR CO/CO₂ Analyzer is a field-deployable, dual-channel infrared gas measurement system engineered for quantitative determination of carbon monoxide (CO) and carbon dioxide (CO₂) in ambient air, indoor environments, occupational settings, and public spaces. It employs non-dispersive infrared (NDIR) spectroscopy — a well-established, interference-resistant optical technique based on selective absorption of infrared radiation at characteristic wavelengths (e.g., 4.6 µm for CO and 4.26 µm for CO₂). Unlike electrochemical or metal-oxide sensors, NDIR offers inherent stability, minimal cross-sensitivity to common atmospheric constituents (e.g., CH₄, H₂O vapor, NOₓ), and long-term calibration integrity. The ZR-3320 supports flexible sensor configurations: single-CO, single-CO₂, or simultaneous dual-gas analysis — enabling users to align instrument capability precisely with regulatory monitoring requirements or site-specific exposure assessment protocols.

Key Features

• High-resolution color touchscreen interface with intuitive menu navigation and real-time waveform visualization
• Automated operational sequence: preheating (<60 min), zero calibration (auto or manual), and continuous concentration measurement with auto-calculation of minute- and hour-averaged values
• Multi-unit display support: μmol/mol (ppm), mg/m³, %, and mol/mol — dynamically convertible per user preference during measurement or data review
• Configurable audible/visual alarm thresholds for CO and CO₂, aligned with occupational exposure limits (e.g., OELs per GBZ 2.1–2019) and public health guidelines (e.g., GB 37488–2019)
• Integrated inlet temperature and relative humidity sensing — critical for density-based concentration correction and traceability under variable environmental conditions
• Robust data management: ≥100,000 measurement records stored on industrial-grade SD card; export via USB mass storage or Bluetooth thermal printer
• Lightweight, impact-resistant carrying case compliant with IP54 ingress protection; optimized for field mobility and rapid deployment
• Standard RS232 serial interface with optional wireless telemetry module (Wi-Fi/Bluetooth) for integration into centralized environmental monitoring platforms
• RFID tag embedded for asset tracking and lifecycle management — compatible with Junray’s optional Instrument Inventory Management Platform
• Optional tripod mount for unattended, time-series monitoring in fixed-location applications (e.g., building HVAC verification, indoor air quality audits)

Sample Compatibility & Compliance

The ZR-3320 is validated for direct sampling of ambient, indoor, and workplace air without preconditioning or dilution. Its NDIR optical path design accommodates particulate-laden or moderately humid airstreams when used with standard hydrophobic inlet filters. The analyzer meets the metrological and functional requirements of multiple national standards, including GB 9801–1988 (ambient CO by NDIR), HJ 965–2018 (automated CO monitoring), GB/T 18204.2–2014 (chemical pollutants in public venues), and GBZ/T 300.37–2017 (workplace CO/CO₂ analysis). All calibration and performance verification procedures adhere to JJG 635–2011 — the national verification regulation for infrared CO/CO₂ analyzers — ensuring traceability to China’s National Institute of Metrology (NIM). While not certified to ISO 12039 or EN 14625, its measurement principle and uncertainty profile are consistent with internationally accepted NDIR methodologies for fixed and portable gas analysis.

Software & Data Management

Data acquisition, annotation, and export are handled entirely onboard — no external PC required for routine operation. Each recorded entry includes timestamp (RTC-synced), sensor ID, raw absorbance signal, compensated concentration value, ambient T/RH, battery level, and operator-defined tags. The SD card file structure follows a standardized CSV schema compatible with Excel, MATLAB, and LIMS systems. Optional firmware updates support enhanced audit trail logging (user actions, calibration events, alarm triggers) — a prerequisite for GLP-aligned field studies. Though not FDA 21 CFR Part 11-compliant out-of-the-box, the platform architecture permits future validation-ready extensions for regulated QA/QC workflows upon customer request and configuration control documentation.

Applications

• Ambient air quality monitoring networks (urban background, roadside, industrial fence-line)
• Indoor air quality (IAQ) assessments in schools, offices, hospitals, and residential buildings per GB/T 17094–1997
• Occupational hygiene surveys in manufacturing, mining, and confined-space operations (GBZ 2.1–2019 compliance)
• Public venue compliance testing (hotels, shopping malls, transportation hubs) per GB 37488–2019
• Verification of ventilation efficiency and HVAC system performance
• Field validation of fixed-site gas monitors and reference method intercomparison studies
• Educational and research use in environmental science, occupational health, and analytical chemistry laboratories

FAQ

What gases does the ZR-3320 measure, and can it be configured for single-gas operation?
The ZR-3320 measures CO and/or CO₂ using interchangeable or co-installed NDIR sensors. Users may select single-CO, single-CO₂, or dual-gas configurations at time of order or via authorized service.
Is the instrument suitable for outdoor use in varying temperature and humidity conditions?
Yes — integrated inlet T/RH sensors enable real-time compensation, and the housing meets IP54 for dust and splash resistance. Operating range is –10 °C to +50 °C, 10–90% RH non-condensing.
How is calibration performed, and what standards are supported?
Zero calibration uses ambient air or certified zero gas; span calibration requires traceable NIST-equivalent CO and/or CO₂ standard gases. Calibration intervals follow JJG 635–2011 guidelines (typically every 3–6 months depending on usage intensity).
Does the ZR-3320 support remote data transmission or cloud integration?
RS232 is standard; optional Wi-Fi or Bluetooth modules enable TCP/IP or BLE-based data streaming to SCADA, IoT dashboards, or custom web platforms.
Can measurement data be exported in formats compatible with regulatory reporting?
Yes — CSV exports include all metadata required for audit-ready reporting, including timestamps, calibration status, environmental conditions, and operator IDs where tagged.