HUANKONG GHK-7204 Integrated Pressure and Flow Calibrator
| Brand | HUANKONG |
|---|---|
| Origin | Shandong, China |
| Manufacturer Type | OEM/ODM Manufacturer |
| Country of Origin | China |
| Model | GHK-7204 |
| Pricing | Available Upon Request |
Overview
The HUANKONG GHK-7204 Integrated Pressure and Flow Calibrator is a portable, multi-function metrological instrument engineered for field and laboratory calibration of environmental sampling devices. It operates on fundamental principles of volumetric flow measurement (via soap-film and orifice-based methods), differential pressure generation (using an integrated electric micro-pressure pump), and thermometric reference (via calibrated thermocouple or RTD-based flue gas temperature sensing). Designed specifically for regulatory compliance in ambient air and stack emission monitoring, the GHK-7204 supports traceable calibration of flow rates across multiple operating conditions—real-time (actual) conditions, and three standardized reference states: 273.15 K / 101.325 kPa (STP), 293.15 K / 101.325 kPa (ISO 13485-aligned ambient reference), and 298.15 K / 101.325 kPa (US EPA-defined standard). Its architecture integrates primary standards traceability with modular sensor interchangeability, enabling direct comparison against certified reference instruments per national metrological regulations.
Key Features
- Industrial-grade 7-inch color touchscreen interface with intuitive icon-driven navigation and multilingual menu support (English default)
- Modular design supporting interchangeable calibration modules: soap-film flowmeter (5 optional volume ranges), orifice flowmeter (7 optional orifice plate configurations), rotary positive-displacement (Roots-type) flowmeter, digital pressure module (±0.1% FS accuracy for differential and gauge pressure), and flue gas temperature probe (range: 0–200 °C, ±0.5 °C uncertainty)
- Automated flow state conversion engine: real-time calculation and display of volumetric flow under actual, STP (273.15 K), ISO-standard (293.15 K), and EPA-standard (298.15 K) conditions
- Digital parameter calibration capability: user-adjustable calibration coefficients for flow time, soap-film tube volume, pressure transducer offset/gain, temperature sensor linearization, and clock drift compensation
- Integrated 12.6 V / 2.6 Ah Li-ion battery pack providing ≥6 hours continuous operation under typical load (including pressure pumping cycles and display backlight)
- Electric micro-pressure pump delivering programmable differential pressures up to ±25 kPa with closed-loop feedback control for stable setpoint maintenance
- USB 2.0 host port supporting FAT32-formatted USB flash drives for bulk data export (CSV format); optional Bluetooth 5.0 wireless printing module compatible with thermal label printers (no proprietary drivers required)
Sample Compatibility & Compliance
The GHK-7204 is validated for calibration of a broad spectrum of environmental sampling instrumentation, including but not limited to: particulate matter (PM10/PM2.5) samplers (e.g., TSP, high-volume, medium-volume), flue gas analyzers (O2, SO2, NOx), volatile organic compound (VOC) canisters and sorbent tube systems, gas chromatography inlet flow controllers, and stack-based dust/ash sampling trains. It complies with Chinese national verification regulations JJG 586–2006 (soap-film flowmeters), JJG 633–2005 (positive displacement gas meters), HJ/T 368–2007 (orifice flowmeter specifications for TSP samplers), and JJF 2033–2023 (calibration methodology for orifice flowmeters). While not certified to ISO/IEC 17025 by default, its modular traceability path supports laboratory accreditation when used with NIM-traceable reference standards and documented uncertainty budgets.
Software & Data Management
Data acquisition and storage are handled internally via non-volatile flash memory supporting ≥1,000 calibration records. Each record includes timestamp, operator ID (user-definable), instrument serial number, module configuration ID, raw sensor readings (flow time, pressure delta, temperature), computed flow values across all four reference states, calibration status flags, and manual input fields for local barometric pressure and ambient temperature (to minimize environmental sensor bias). Exported CSV files contain column headers compliant with common LIMS ingestion protocols (e.g., “Date_UTC”, “Flow_Actual_L_min”, “Flow_STP_L_min”, “Delta_P_kPa”, “T_flue_C”). No cloud connectivity or remote firmware update capability is implemented—ensuring data sovereignty and audit readiness per GLP/GMP-aligned quality systems.
Applications
- Field verification and periodic recalibration of fixed-site and mobile emission monitoring systems (CEMS)
- Pre-deployment validation of low-flow (100 L/min) environmental samplers in accordance with EPA Method 5, ISO 9096, and GB/T 16157
- Uncertainty analysis support for accredited laboratories performing ISO/IEC 17025 method validation of flow-dependent analytical procedures
- Training and proficiency testing for environmental technicians under CNAS-CL01 and provincial ecological monitoring center competency frameworks
- Supporting QA/QC programs for continuous stack monitoring where flow rate drift directly impacts mass emission calculations (e.g., kg/h SO2)
FAQ
What reference standards does the GHK-7204 require for traceable calibration?
It requires external verification against NIM-certified soap-film flow standards or NIST-traceable pressure references at least annually; internal self-calibration routines verify timing accuracy and pressure linearity.
Can the device perform simultaneous pressure and flow calibration?
Yes—it supports concurrent differential pressure application while measuring volumetric flow through orifice or soap-film modules, enabling dynamic system response characterization.
Is the battery replaceable by the end user?
The Li-ion pack is field-replaceable using standard Torx tools; replacement units are available as spare parts with full CE/ROHS documentation.
Does the GHK-7204 meet FDA 21 CFR Part 11 requirements?
No—it lacks electronic signature, audit trail, and role-based access control features required for regulated pharmaceutical applications; it is intended for environmental metrology only.
How is temperature compensation applied during flow conversion?
User-entered ambient temperature and barometric pressure are used alongside measured flue gas temperature to compute compressibility factor Z and ideal gas law corrections per ISO 5167 and AGA Report No. 8.
