GXH-3051E Intelligent Carbon Monoxide (CO) Analyzer by Junfang Lihua
| Brand | Junfang Lihua |
|---|---|
| Origin | Beijing, China |
| Model | GXH-3051E |
| Instrument Type | Portable |
| Detection Target | Single-component CO |
| Measurement Range | 0–50 ppm |
| Repeatability | ≤1% F.S. |
| Resolution | 0.1 ppm |
| Response Time | ≤30 s |
| Zero Drift | ≤±1% F.S. |
| Span Drift | ≤±1% F.S. |
| Linearity Error | ≤±1% F.S. |
Overview
The GXH-3051E Intelligent Carbon Monoxide (CO) Analyzer is a portable, field-deployable infrared gas analyzer engineered for high-fidelity quantitative measurement of carbon monoxide concentration in ambient air, indoor environments, industrial exhaust streams, and laboratory-generated gas samples. It operates on the principle of non-dispersive infrared (NDIR) spectroscopy—exploiting the characteristic absorption band of CO near 4.6 µm—to deliver selective, interference-resistant detection without chemical reagents or consumables. Designed to meet the operational requirements of environmental monitoring agencies, occupational health & safety teams, and research laboratories, the instrument complies with core Chinese national standards including GB/T 18204.2–2014 (for indoor air quality) and HJ 973–2018 (for fixed pollution source exhaust monitoring), while its metrological performance aligns with internationally recognized principles for trace gas analysis under ISO 12039 and ASTM D6522.
Key Features
- NDIR optical architecture with thermopile detector and dual-wavelength referencing for enhanced stability and reduced cross-sensitivity to humidity and CO₂
- Integrated sampling probe featuring active cooling, particulate filtration, hydrophobic membrane-based water removal, and dust pre-separation—enabling direct sampling from hot, humid, or particulate-laden streams without external conditioning units
- Rechargeable Li-ion battery and AC/DC dual-power operation supporting >8 hours of continuous field use
- Backlit 3.5-inch TFT LCD touchscreen interface with intuitive menu navigation, real-time trend plotting, and on-device data review
- Automatic zero calibration and span verification routines triggered at user-defined intervals or upon power-up
- Ruggedized ABS housing with IP54-rated ingress protection, drop-tested to 1 m, and designed for transport in standard carrying case with foam-cut compartments
Sample Compatibility & Compliance
The GXH-3051E is validated for gaseous matrices including ambient air, workplace breathing-zone air, flue gas (after temperature stabilization ≤60 °C), and laboratory calibration gas mixtures. It is not intended for use in explosive atmospheres (ATEX/IECEx zones) or corrosive gas streams containing SO₂, NOₓ, or halogenated compounds above 10 ppm without upstream scrubbing. The analyzer meets China’s mandatory CCC certification requirements for environmental monitoring instruments and supports audit-ready documentation per GLP-compliant workflows. While not FDA 21 CFR Part 11-certified out-of-the-box, its data export protocols (CSV via USB) are compatible with validated LIMS integration when paired with timestamped, user-authenticated logging procedures.
Software & Data Management
Onboard memory stores up to 10,000 timestamped measurement records (date/time, CO concentration, temperature, pressure, battery status). Data export is supported via USB 2.0 to Windows-based PCs using proprietary PC software that enables spectral baseline review, calibration history tracking, and customizable report generation (PDF/Excel). The software logs all operator-initiated actions—including manual zeroing, span adjustment, and firmware updates—with immutable timestamps and user ID fields, facilitating traceability during regulatory inspections. Firmware updates are delivered via signed binary files to ensure integrity and version control.
Applications
- Indoor air quality (IAQ) assessment in residential buildings, schools, and office complexes per GB 50325–2020
- Occupational exposure monitoring in garages, boiler rooms, and metal fabrication facilities where incomplete combustion occurs
- Field validation of fixed CO monitors deployed in municipal environmental networks
- Method validation and reference measurements during development of electrochemical or MOS-based CO sensors
- Post-combustion emission screening for small-scale biomass heaters and diesel generators prior to formal stack testing
- Teaching laboratories demonstrating NDIR fundamentals, gas law applications, and sensor metrology
FAQ
What gases can interfere with CO measurement on the GXH-3051E?
Water vapor and high concentrations of CO₂ (>5%) may induce minor baseline shifts; however, the dual-wavelength compensation algorithm minimizes these effects. Ethylene and acetylene exhibit weak overlap near 4.6 µm but are typically below interference thresholds (<50 ppm) in ambient and occupational settings.
Is the instrument suitable for continuous unattended operation?
It is optimized for intermittent field surveys (up to 8 h/battery cycle) rather than permanent installation. For continuous monitoring, an external power supply and periodic manual maintenance (filter replacement every 30 days in dusty environments) are required.
Can calibration be performed in the field without certified gas standards?
Zero calibration uses ambient air (assumed CO-free); span calibration requires traceable CO-in-N₂ standard gas (e.g., 20 ppm ±2% uncertainty). Onboard calibration routines do not substitute for periodic verification against NIST-traceable references.
Does the device support analog output for connection to SCADA systems?
No analog (4–20 mA or 0–10 V) output is provided; only digital communication via USB and internal data logging are supported.
How often should the sampling filter be replaced?
Under typical urban ambient conditions, replace the hydrophobic PTFE filter every 60 days; in high-dust environments (e.g., construction sites or workshops), inspect weekly and replace when visible particulate loading occurs.
