HUANKONG GHK-7000K Orifice Flow Calibrator
| Brand | HUANKONG |
|---|---|
| Origin | Shandong, China |
| Manufacturer Type | OEM Manufacturer |
| Country of Origin | China |
| Model | GHK-7000K |
| Power Supply | AC/DC dual-mode with built-in rechargeable high-energy lithium battery |
| Compliance | HJ/T 368–2007 |
| Flow Range Options | 2–1300 L/min (selectable by configuration) |
| Display | Backlit LCD with Chinese UI |
| Sensor Accuracy | High-precision differential pressure & temperature sensing |
| Calibration Parameters | Actual flow (Q_act), standard flow (Q_std), ambient temperature, atmospheric pressure, orifice ΔP |
Overview
The HUANKONG GHK-7000K Orifice Flow Calibrator is a precision-engineered instrument designed for traceable, field-deployable calibration of air sampling pumps used in environmental monitoring. It operates on the fundamental principle of orifice-based laminar flow measurement—leveraging the ISO 5167–2 (2003) compliant orifice plate geometry to generate a predictable, repeatable pressure drop (ΔP) across a fixed-diameter aperture under subsonic, incompressible flow conditions. When coupled with real-time measurements of ambient temperature and atmospheric pressure, the device computes both actual volumetric flow rate (Qact, L/min at operating conditions) and standardized flow rate (Qstd, L/min at 25 °C and 101.325 kPa), enabling strict adherence to regulatory sampling protocols defined in EPA Method IO-4, EN 12341, and China’s HJ/T 368–2007. Its robust mechanical architecture and thermally stabilized sensor array ensure metrological integrity across extended field deployments—from urban ambient PM2.5 networks to industrial stack emission testing.
Key Features
- Multi-range orifice module system supporting configurable flow spans from 2 to 1300 L/min, aligned with application-specific categories: 02 (ambient air & flue gas samplers), 10/15 (low-flow personal monitors), 40 (semi-volatile organic compound (SVOC) samplers), and 800/1300 (high-flow dioxin and total suspended particulate (TSP) systems).
- Integrated high-stability differential pressure transducer (±0.5% FS accuracy), PT100-class temperature sensor (±0.2 °C), and piezoresistive barometric sensor (±0.1 kPa), all factory-traceable to NIM (National Institute of Metrology, China).
- Backlit monochrome LCD display with full Chinese graphical interface—designed for intuitive operation under low-light field conditions without requiring external computing devices.
- Dual-power architecture: supports continuous operation via AC adapter (100–240 VAC, 50/60 Hz) or up to 12 hours on internal rechargeable lithium-ion battery (7.4 V, 4400 mAh), with battery-level indicator and low-voltage warning.
- Mechanically hardened orifice assembly fabricated from 316 stainless steel and sapphire-coated orifice plates—resistant to abrasion, corrosion, and thermal drift over >10,000 calibration cycles.
Sample Compatibility & Compliance
The GHK-7000K is validated for use with all major classes of environmental air samplers—including but not limited to SKC, Gilian, TSI, Thermo Fisher, and domestic OEM models—across EPA-defined flow regimes (low: 30 L/min). It meets the technical requirements specified in HJ/T 368–2007 for orifice-type calibrators used in TSP, PM10, and PM2.5 sampler verification. While not certified to ISO/IEC 17025 as a standalone calibration laboratory, its measurement chain is fully documented for GLP-compliant audit trails when paired with user-maintained calibration logs and annual sensor verification per manufacturer-recommended intervals.
Software & Data Management
The GHK-7000K operates autonomously without proprietary software dependencies. All measured and derived parameters—including Qact, Qstd, Tamb, Patm, and ΔP—are displayed in real time and stored internally (up to 500 records) with timestamp, operator ID field, and configuration mode tag. Data export is supported via USB-C interface using standard CSV format—compatible with Excel, LabArchives, and LIMS platforms. No cloud connectivity or remote firmware updates are implemented; firmware revisions require local upload via PC utility (Windows 10/11 compatible), preserving data sovereignty and network isolation for regulated environments.
Applications
- Field calibration and performance verification of low-, mid-, and high-volume air samplers prior to and following environmental monitoring campaigns.
- Verification of flow stability during long-term unattended sampling (e.g., 24-hr PM2.5 gravimetric analysis or SVOC passive/active sampling).
- Supporting QA/QC documentation for CNAS-accredited laboratories conducting ambient air quality assessments per HJ 618–2011 and HJ 93–2013.
- Technical training and metrology education for environmental technicians—demonstrating primary flow standards traceability through orifice physics and gas law corrections.
FAQ
Does the GHK-7000K provide NIST-traceable calibration certificates?
No. Factory calibration is traceable to China’s National Institute of Metrology (NIM). Users requiring NIST-traceable certification must arrange third-party calibration with an ISO/IEC 17025-accredited lab.
Can the device correct for humidity effects in flow calculations?
No. Per HJ/T 368–2007 and ISO 5167–2, humidity compensation is excluded from orifice-based dry-air flow computation. For hygroscopic aerosol sampling, users must apply post-processing corrections based on independent RH measurement.
Is the orifice plate user-replaceable?
Yes. Orifice modules are modular and field-swappable—each labeled with nominal K-factor and certified flow range. Replacement requires recalibration verification against reference standard.
What is the recommended recalibration interval?
Annual verification is advised under routine use. More frequent checks (e.g., quarterly) are required in high-dust or corrosive sampling environments.
Does the GHK-7000K support Bluetooth or Wi-Fi data transmission?
No. It maintains a closed-system architecture to ensure electromagnetic compatibility (EMC) in industrial field settings and eliminate cybersecurity exposure vectors.
