HUANKONG GHK-4100G Portable NDIR Multi-Gas Analyzer (CO/CO₂/O₂)
| Brand | HUANKONG |
|---|---|
| Model | GHK-4100G |
| Type | Portable Multi-Component Gas Analyzer |
| Detection Principle | Non-Dispersive Infrared (NDIR) for CO and CO₂ |
| Measurement Range (typical) | CO: 0–1000 ppm |
| CO₂ | 0–5000 ppm |
| O₂ | 0–25% vol |
| Accuracy | ±2% FS (CO, CO₂) |
| Response Time (T90) | <30 s |
| Operating Temperature | 0–40 °C |
| Relative Humidity | 0–95% RH (non-condensing) |
| Flow Rate | 0.5–2.0 L/min |
| Data Storage | >8000 records |
| Battery Life | >4 h (Li-ion, rechargeable) |
| Communication | USB, RS232, optional Bluetooth |
| Compliance | JJG635–2011, GBZ/T 300.37–2017, GB/T 18204.2–2014, GB 8982–2009, YY 1468–2016 |
Overview
The HUANKONG GHK-4100G Portable NDIR Multi-Gas Analyzer is an engineered field-deployable instrument designed for simultaneous quantitative measurement of carbon monoxide (CO), carbon dioxide (CO₂), and oxygen (O₂) in ambient air, indoor environments, occupational workspaces, medical gas supply lines, and industrial process streams. It employs dual-wavelength non-dispersive infrared (NDIR) spectroscopy for selective detection of CO and CO₂—leveraging their unique absorption bands at 4.6 µm and 4.26 µm, respectively—while O₂ concentration is determined via a high-stability electrochemical or paramagnetic sensor (configurable per application requirements). The analyzer operates on the Beer–Lambert principle, ensuring linear response across calibrated ranges and minimizing spectral interference through optical filtering and advanced signal processing. Its compact, ruggedized chassis meets IP54 ingress protection standards for field use, and its real-time compensation algorithms correct for ambient temperature (0–40 °C) and relative humidity (0–95% RH, non-condensing), maintaining metrological integrity under variable environmental conditions.
Key Features
- High-resolution 5-inch color TFT touchscreen with dual display modes: numeric readout and analog-style gauge visualization for intuitive operational feedback
- Dual-mode zero calibration: automated catalytic oxidation zeroing (for CO/CO₂) or inert gas (N₂) purging—both selectable via menu interface
- Integrated precision sampling pump (imported diaphragm type) with adjustable flow control (0.5–2.0 L/min) and high static pressure capability (>25 kPa)
- Real-time environmental compensation: embedded temperature and humidity sensors feed dynamic correction algorithms to maintain accuracy across operational ranges
- Multi-timescale averaging: configurable 1-hour, 8-hour, and 24-hour time-weighted average (TWA) calculation and storage per OEL (Occupational Exposure Limit) compliance protocols
- Robust data management: onboard memory stores ≥8,000 timestamped measurement records with full metadata (date/time, sensor status, calibration history, environmental conditions)
- Dual power architecture: rechargeable high-capacity lithium-ion battery (≥4 h continuous operation) + AC adapter support; automatic switchover ensures uninterrupted monitoring
- Configurable alarm system: user-defined threshold limits for each gas channel with simultaneous visual (LED strobe) and audible (≥85 dB) alerts
- Unit flexibility: seamless switching between ppm, mg/m³, % vol, and mmol/mol for regulatory reporting alignment (e.g., OSHA PELs, WHO IAQ guidelines)
- Digital connectivity suite: standard USB host/device, RS232 serial interface; optional Bluetooth 5.0 module enables wireless data streaming to mobile devices or cloud platforms
Sample Compatibility & Compliance
The GHK-4100G is validated for direct analysis of undiluted ambient air, workplace breathing-zone samples, medical-grade oxygen pipelines, and compressed gas streams with particulate filtration (<5 µm). It complies with Chinese national verification regulations and testing standards including JJG635–2011 (verification procedure for CO/CO₂ infrared analyzers), GBZ/T 300.37–2017 (workplace air toxicant determination), GB/T 18204.2–2014 (public health chemical pollutant testing), GB 8982–2009 (medical and aviation breathing oxygen purity), and YY 1468–2016 (oxygen concentrator pipeline system specifications). While not certified to ISO 17025 or FDA 21 CFR Part 11 out-of-the-box, its audit-ready data logging (with operator ID tagging, calibration timestamps, and tamper-evident file structure) supports GLP/GMP-aligned quality systems when deployed with documented SOPs.
Software & Data Management
Data export is supported via removable USB flash drive (FAT32 formatted) in CSV format—compatible with Excel, MATLAB, and LIMS integration. The internal firmware implements cyclic redundancy check (CRC-16) for all stored records to ensure data integrity. Optional PC software provides graphical trend analysis, TWA validation reports, calibration certificate generation, and batch export with customizable headers. All communication interfaces enforce command-response handshaking to prevent packet loss during high-throughput transfer. Firmware updates are performed via signed binary files loaded from USB, preserving configuration parameters and calibration coefficients across revisions.
Applications
- Indoor air quality (IAQ) assessment in offices, schools, hospitals, and public transport hubs per ASHRAE Standard 62.1 and WHO guidelines
- Occupational hygiene monitoring for CO exposure in boiler rooms, parking garages, welding zones, and confined spaces (OSHA 29 CFR 1910.1000)
- Verification of medical oxygen purity and CO/CO₂ contamination levels in hospital central supply systems and portable concentrators
- Leak detection and combustion efficiency evaluation in HVAC, industrial furnaces, and biomass heating systems
- Field validation of fixed gas detection networks during commissioning or periodic performance verification
- Environmental health surveys in urban microenvironments, landfill perimeter monitoring, and tunnel ventilation studies
FAQ
What gas detection technologies are integrated in the GHK-4100G?
It combines NDIR spectroscopy for CO and CO₂, and a factory-calibrated electrochemical (or paramagnetic) sensor for O₂—ensuring orthogonal selectivity and minimal cross-sensitivity.
Does the instrument require external calibration gases for routine operation?
Zero calibration can be performed using dry nitrogen or catalytic zero-air generation; span calibration requires certified gas mixtures traceable to NIST or equivalent national standards.
Can the GHK-4100G meet regulatory reporting requirements for occupational exposure assessments?
Yes—it calculates and logs time-weighted averages (1-hr, 8-hr, 24-hr) aligned with GBZ/T 300.37–2017 and ACGIH TLV® frameworks, and stores full audit trails required for workplace safety documentation.
Is the battery replaceable in the field?
The Li-ion battery pack is user-replaceable without tools; spare batteries and chargers are available as authorized accessories.
How is data integrity ensured during long-term unattended deployment?
Each record includes CRC-16 checksums, real-time clock stamping, and immutable calibration metadata—supporting traceability in regulated environments where data authenticity is critical.
