HUANKONG GHK-2054 High-Flow Environmental Aerosol Sampler

Overview

The HUANKONG GHK-2054 High-Flow Environmental Aerosol Sampler is a field-deployable, microprocessor-controlled instrumentation system engineered for quantitative collection of airborne particulate matter (PM₁₀, PM_2.5, total suspended particulates) onto filter media under defined volumetric conditions. It operates on the principle of constant-flow aspiration using a calibrated mass flow sensor in series with a high-efficiency, low-noise brushless DC blower—ensuring stable volumetric draw across variable ambient pressure and temperature gradients. Designed specifically for radiological environmental monitoring, the GHK-2054 meets the metrological and procedural requirements of Chinese national standards HJ 1149–2020 (γ-emitting radionuclide analysis in aerosol filters via gamma spectrometry), HJ 61–2021 (technical specifications for radiation environmental monitoring), and HJ 1009–2019 (operation protocols for automated radiation air monitoring stations). Its architecture supports long-term unattended operation in fixed or mobile monitoring configurations, delivering traceable, audit-ready sampling records essential for regulatory reporting and dose assessment modeling.

Key Features

• Real-time closed-loop flow regulation: Integrated thermal mass flow sensor, absolute pressure transducer, and Pt100 temperature probe feed back to an embedded MCU for dynamic PID-based fan speed control—maintaining user-defined flow setpoints within ±2% accuracy over operating range.
• Full environmental parameter logging: Simultaneous acquisition and display of actual volumetric flow (in L/min at prevailing T&P), cumulative sampled volume (L), ambient temperature (°C), barometric pressure (kPa), elapsed time, and power-interruption duration.
• Digital calibration suite: Non-volatile memory stores individual sensor offset/gain coefficients; field technicians perform zero/span adjustments for flow, temperature, pressure, and internal clock without hardware intervention.
• Robust mechanical design: Aluminum alloy chassis with IP54-rated enclosure; tripod-mounting interface enables height adjustment from 1.5 m to 3.0 m above ground level—compliant with ISO 8518 and EPA Method 201A siting guidelines.
• Fail-safe operational logic: Auto-shutdown triggered if flow deviates >±10% from setpoint for ≥300 seconds; immediate fault logging with error code and timestamp; automatic recovery upon return to specification.
• Power resilience: Internal backup capacitor sustains RAM and RTC during grid loss; full session data preserved; resumes sampling at original flow/volume target upon re-powering—no manual restart required.
• Expandable data handling: Onboard non-volatile memory retains up to 100 complete sampling sessions (each including start/stop timestamps, environmental readings, and diagnostic flags); exportable via standard USB-A port to FAT32-formatted flash drives.

Sample Compatibility & Compliance

The GHK-2054 is compatible with standard 8×10 inch (203×254 mm) or 47 mm circular quartz fiber, cellulose ester, or polytetrafluoroethylene (PTFE) membrane filters—supporting gravimetric, elemental, radiochemical, and organic speciation analyses. Filter holders conform to ISO 7708 and EN 12341 dimensional tolerances. All measurement algorithms and uncertainty propagation models adhere to GUM (JCGM 100:2008) principles. The instrument’s firmware and data management workflow are structured to support GLP-compliant audit trails: each exported dataset includes cryptographic hash verification, operator ID field (configurable), and immutable metadata headers compliant with ISO/IEC 17025 documentation requirements.

Software & Data Management

No proprietary desktop software is required for basic operation or data retrieval. Raw parameter logs export as UTF-8 encoded CSV files with ISO 8601 timestamps and SI-unit annotations (e.g., “Flow_Lpm”, “Temp_C”, “Press_kPa”, “Vol_L”). Optional firmware update packages (delivered via signed .bin files) include version-locking and CRC32 validation. For integration into centralized environmental data platforms (e.g., EPA AirNow, WMO GAW), ASCII serial output (RS-232, 9600 baud, N-8-1) provides real-time streaming of live sensor values and status flags—enabling third-party SCADA or IoT gateway ingestion without middleware.

Applications

• Radiation environmental surveillance networks: Continuous aerosol capture for ¹³⁷Cs, ⁶⁰Co, ²¹⁰Pb, and other γ-emitting nuclides per HJ 1149–2020.
• Urban and industrial PM source apportionment studies requiring high-volume (>1 m³/h) integrated filter samples for ICP-MS or XRF analysis.
• Emergency response deployments: Rapid setup for post-incident airborne radionuclide screening near nuclear facilities or after RDD events.
• Long-term trend analysis in background monitoring stations where multi-week uninterrupted sampling is critical for low-concentration isotope detection limits.
• Educational laboratories conducting atmospheric physics experiments on aerosol size distribution, deposition velocity, and filtration efficiency testing.

FAQ

What filter types are validated for use with the GHK-2054?
Quartz fiber (QMA/QMB), cellulose acetate, mixed cellulose ester (MCE), and hydrophobic PTFE membranes—provided they meet ASTM D2974 or ISO 10175 dimensional and integrity specifications.
Does the GHK-2054 support remote monitoring via Ethernet or cellular modem?
No native Ethernet or LTE interface is included; however, RS-232 serial output allows connection to external telemetry modules supporting Modbus RTU or custom ASCII protocols.
Is the instrument suitable for outdoor deployment in sub-zero temperatures?
Operating range is specified from –10 °C to +45 °C; extended cold-weather operation requires optional heated inlet housing (not supplied) to prevent filter icing and flow sensor condensation.
How is traceability maintained for calibration certificates?
Each unit ships with a factory calibration report referencing NIM (National Institute of Metrology, China) traceable standards; users may perform field verification using primary-standard rotameters or certified electronic flow calibrators compliant with ISO 6145-3.
Can sampling parameters be modified during an active run?
Yes—flow rate, target volume, and duration can be adjusted in real time via the front-panel keypad; the system recalculates remaining time/volume and updates all displayed metrics instantaneously without interrupting airflow.