Galaxy Tech GXH-3010/3011BF Portable NDIR Dual-Gas Analyzer for CO and CO₂

Overview

The Galaxy Tech GXH-3010/3011BF is a field-deployable, dual-channel non-dispersive infrared (NDIR) gas analyzer engineered for simultaneous, real-time quantification of carbon monoxide (CO) and carbon dioxide (CO₂) in ambient air, indoor environments, occupational settings, and industrial hygiene applications. Its measurement architecture relies on the fundamental absorption characteristics of CO and CO₂ molecules within specific mid-infrared spectral bands—2170 cm⁻¹ for CO and 2350 cm⁻¹ for CO₂—enabling selective, interference-resistant detection without optical filters or moving parts. Designed to meet national metrological verification requirements per JJG 635–1999 and environmental testing standards including GB/T 18204.23–2000 (CO) and GB/T 18204.24–2000 (CO₂), the instrument satisfies Class II accuracy specifications as defined in Chinese metrological regulations and is eligible for calibration certification from the National Institute of Metrology (NIM). Its compact form factor, integrated sampling pump, and dual power mode (AC mains or rechargeable lithium-ion battery) support extended unattended operation in mobile surveying, emergency response, building ventilation audits, and workplace exposure assessment.

Key Features

• Simultaneous NDIR-based detection of CO (0–50.0 ppm) and CO₂ (0–0.500% v/v), with optional extended-range configurations up to 100.0% CO₂ for combustion or fermentation monitoring.
• High-stability optical path design incorporating built-in zero-air filtration and six-port valve switching for automated zero calibration and measurement cycles—eliminating manual gas cylinder dependency during routine field use.
• Large backlit LCD display supporting dual-unit readouts: CO in ppm and mg/m³; CO₂ in % volume and mg/m³—with automatic unit conversion based on user-defined temperature and pressure inputs.
• Onboard data logger capable of storing up to 5,000 timestamped measurement records, each including CO concentration, CO₂ concentration, date/time stamp, and operational status flags.
• RS232 serial interface compliant with standard TIA/EIA-232-F protocol, enabling direct connection to PCs for real-time data streaming or batch download via Galaxy Tech’s certified data management software.
• Modular expansion architecture supports integration of optional electrochemical O₂ sensors and capacitive temperature/humidity probes—providing correlated environmental context for gas concentration interpretation.
• Robust mechanical housing (270 × 230 × 90 mm, ≤3.5 kg) with IP54-rated ingress protection, ergonomic carrying strap, and shock-absorbing aluminum alloy transport case for field durability.

Sample Compatibility & Compliance

The GXH-3010/3011BF is validated for analysis of gaseous samples drawn directly from ambient air, ducts, chambers, or confined workspaces using its internal diaphragm pump (max flow: 1.5 L/min). It complies with Chinese national standards governing public health and occupational safety: GB/T 9801–1988 (CO by NDIR), GB/T 18204.23–2000 (CO in public places), and GB/T 18204.24–2000 (CO₂ in public places). Its performance parameters—including linearity (≤±2% F.S.), repeatability (≤1% F.S.), and drift stability (≤±2% F.S./4 h)—align with Class II instrument classification under JJG 635–1999, ensuring traceability to national reference standards. While not pre-certified to ISO 12039 or EN 14625, its NDIR methodology and documented metrological behavior support validation against ISO/IEC 17025 laboratory quality systems when operated under controlled GLP conditions.

Software & Data Management

The included Windows-compatible data acquisition software provides secure, auditable handling of measurement records. Functions include time-synchronized data visualization, export to CSV or Excel formats, customizable report generation (including calibration history and instrument ID), and configurable alarm thresholds for CO and CO₂. The software enforces user-level access control and maintains an immutable audit trail of all configuration changes and data exports—supporting basic compliance with FDA 21 CFR Part 11 principles for electronic records in regulated environments. All firmware updates are delivered via signed binary packages with version-controlled release notes.

Applications

• Indoor air quality (IAQ) assessment in schools, offices, hospitals, and residential buildings per GB/T 18883–2002 guidelines.
• Occupational exposure monitoring in garages, boiler rooms, laboratories, and manufacturing facilities where incomplete combustion occurs.
• Validation of HVAC system performance through CO₂-based demand-controlled ventilation (DCV) diagnostics.
• Emergency response screening for CO leaks following natural disasters or equipment failure.
• Environmental field surveys near traffic corridors, industrial zones, or landfill sites requiring portable, battery-powered instrumentation.
• Research-grade spot measurements in atmospheric chemistry studies where dual-gas correlation enhances source attribution.

FAQ

Does the GXH-3010/3011BF require external zero gas cylinders for calibration?
No. It incorporates an integrated zero-air filter and automated six-port valve system that enables periodic zero-point verification without external gas sources.
Can the instrument operate continuously for 24 hours?
Yes—when configured with the optional continuous monitoring firmware package, it supports scheduled logging at user-defined intervals (e.g., every 1–60 minutes) and calculates rolling 24-hour averages displayed on-screen.
Is the RS232 interface compatible with modern laptops lacking serial ports?
Yes—standard USB-to-RS232 adapters (FTDI chipset recommended) are fully supported; driver installation and communication settings are documented in the technical manual.
What is the typical service interval for optical maintenance?
Under normal field use, the NDIR optical module requires no routine cleaning or alignment; annual verification against certified reference gases is recommended to maintain metrological integrity.
Can CO and CO₂ measurements be exported in SI-compliant units only?
Yes—the software allows fixed-unit output (e.g., CO in mg/m³ at 25°C and 101.3 kPa) with configurable reference conditions applied during post-processing.