HUANKONG GHK-1120 Portable Dual-Channel Constant-Flow Air Sampler
| Brand | HUANKONG |
|---|---|
| Origin | Shandong, China |
| Manufacturer Type | Direct Manufacturer |
| Product Category | Domestic |
| Model | GHK-1120 |
| Instrument Type | 24-Hour Temperature- and Flow-Controlled Gas Sampler |
| Configuration | Dual-Channel Gas Sampler |
| Flow Range | 0.1–1.0 L/min (extendable to 0.1–2.0 L/min) |
| Maximum Vacuum Pressure | 50–110 kPa |
| Flow Stability | ≤ ±2.5% |
| Mass Flow Meter Accuracy | ≤ ±2.5% |
| Operational Duration at Max Flow & Backpressure | > 4 hours |
Overview
The HUANKONG GHK-1120 Portable Dual-Channel Constant-Flow Air Sampler is an engineered field instrument designed for regulatory-compliant collection of gaseous and particulate pollutants from ambient air, indoor environments, and occupational workspaces. It operates on the principle of precision-controlled volumetric sampling—maintaining a user-defined, time-invariant mass flow rate across variable inlet resistances (e.g., sorbent tubes, filter media, or impingers) using closed-loop PID feedback control. This ensures adherence to standardized sampling protocols requiring constant-flow operation under fluctuating ambient pressure and temperature conditions. The dual-channel architecture enables simultaneous, independent sampling—critical for comparative analysis (e.g., parallel adsorption–desorption validation), co-sampling of complementary analytes (e.g., formaldehyde and TVOCs), or concurrent personal and area monitoring per OSHA and NIOSH methodologies.
Key Features
- Two independently controllable sampling channels, each equipped with a high-efficiency, low-noise brushless DC pump rated for continuous operation under up to 110 kPa vacuum load—ensuring long-term reliability in high-resistance sampling configurations.
- Integrated thermal-mass flow sensors calibrated to NIST-traceable standards, delivering real-time flow regulation with ≤ ±2.5% stability and accuracy over the full 0.1–2.0 L/min range.
- Onboard environmental sensing: automatic measurement and compensation for ambient temperature (±0.5 °C) and atmospheric pressure (±0.1 kPa), enabling real-time calculation and display of both actual flow (L/min) and standardized volume (L at 25 °C, 101.325 kPa).
- Dual-stage 2 µm particulate filtration upstream of the pump and flow sensor—preventing dust-induced drift and extending service intervals without compromising flow integrity.
- Rechargeable lithium-ion battery system supporting >4 hours of continuous dual-channel operation at maximum specified flow and backpressure—validated per GB/T 17061–1997 requirements for portable sampler endurance.
- Non-volatile memory storing >500 sampling records per channel, including start/stop timestamps, setpoints, measured environmental parameters, and cumulative standard-volume data—with power-loss recovery preserving all active session metadata.
Sample Compatibility & Compliance
The GHK-1120 is validated for use with EPA TO-17, ISO 16000-6, and Chinese national standards including HJ/T 375–2007 (Ambient Air Sampler Technical Requirements), HJ/T 400–2007 (In-Vehicle VOC and Carbonyl Sampling), and HJ 584–2010 (BTEX Analysis via Activated Carbon Adsorption/CS₂ Desorption–GC). Its flow performance meets JJG 956–2013 metrological verification criteria for atmospheric samplers. Dual-channel synchronization supports paired sampling strategies required by GB 50325–2020 (Control Standard for Indoor Environmental Pollution in Civil Building Engineering) and GB/T 18883–2022 (Indoor Air Quality Standard). All firmware and data handling routines are structured to support GLP-aligned audit trails; optional Bluetooth data export facilitates integration into laboratory information management systems (LIMS) compliant with ISO/IEC 17025 documentation requirements.
Software & Data Management
The device features an embedded real-time operating system with intuitive keypad navigation and a high-contrast OLED display. Sampling parameters—including flow setpoint, duration mode (timed/continuous), channel enable/disable status, and calibration offsets—are configurable via secure menu access. All measurements are timestamped and stored with metadata (temperature, pressure, battery voltage). Optional Bluetooth 4.2 module enables wireless transmission of CSV-formatted datasets to iOS/Android tablets or Windows PCs for post-processing in Excel or validated analytical software (e.g., EPA Compendium Method TO-15A workflows). Firmware supports field-upgradable calibration coefficients and maintains immutable logs of calibration events, operator ID inputs, and system diagnostics—meeting traceability expectations under CNAS-CL01 and FDA 21 CFR Part 11 Annex 11 principles where electronic records are subject to review.
Applications
- Ambient air quality monitoring networks (PM₂.₅ precursor gases, ozone precursors, HCHO)
- Indoor air quality assessments in residential, commercial, and educational buildings per GB/T 18883–2022
- VOC profiling in automotive cabins (HJ/T 400–2007), newly renovated spaces, and industrial painting booths
- Occupational hygiene surveys for benzene, toluene, xylene (BTX), ammonia, and total volatile organic compounds (TVOC) in accordance with GB/T 17061–1997
- Method validation studies requiring side-by-side sampling with reference instruments or alternative collection media
- Field deployment in mobile laboratories, emergency response units, and community-based exposure assessment campaigns
FAQ
Does the GHK-1120 comply with U.S. EPA or EU EN standards for air sampling?
It conforms to core functional and metrological requirements aligned with EPA Method TO-15A and EN 13670–1 for constant-flow sampling performance, though formal EPA or UKAS certification is not held; users should verify local regulatory acceptance prior to compliance-critical deployments.
Can the instrument be used with sorbent tubes requiring flows above 1.0 L/min?
Yes—the extended flow range of 0.1–2.0 L/min is supported, provided the selected tube resistance remains within the 50–110 kPa vacuum capability; performance validation at elevated flows is recommended per HJ/T 375–2007 Annex B.
Is calibration certificate included with shipment?
Each unit ships with a factory calibration report referencing internal flow standards traceable to national metrology institutes; third-party accredited calibration is available upon request.
How is data security managed during Bluetooth transfer?
Bluetooth pairing requires manual initiation and uses AES-128 encryption; no persistent credentials are stored on the device, and exported files contain no embedded PII or system identifiers.
What maintenance intervals are recommended for field operation?
Filter elements should be inspected before each deployment and replaced after 50 hours of cumulative runtime or when differential pressure exceeds 15 kPa; annual recalibration of flow sensors is advised per JJG 956–2013.
