HUANKONG GHK-7400 Gas Flow Controller
| Brand | HUANKONG |
|---|---|
| Origin | Shandong, China |
| Manufacturer Type | Original Equipment Manufacturer (OEM) |
| Country of Origin | China |
| Model | GHK-7400 |
| Price | USD 14,000 (FOB) |
Overview
The HUANKONG GHK-7400 Gas Flow Controller is a precision-engineered instrument designed for metrological traceability in calibration and verification workflows of fixed and portable gas detection instruments. It operates on the principle of thermal mass flow measurement—utilizing constant-temperature anemometry to deliver real-time, temperature- and pressure-compensated volumetric flow readings across a wide range of industrial and laboratory gases. Unlike conventional rotameters or differential-pressure-based devices, the GHK-7400 integrates dual-path control architecture (main + bypass), enabling independent, dynamic regulation of gas delivery rates while maintaining high repeatability (< ±0.5% FS typical) under varying backpressure conditions. Its primary application domain aligns with national metrological verification procedures for toxic, combustible, and corrosive gas analyzers—supporting traceable flow delivery at defined reference conditions (293.15 K, 101.325 kPa) required by regulatory test protocols.
Key Features
- Thermal mass flow sensor with digital compensation for temperature and pressure drift, ensuring stable output across ambient fluctuations (0–40 °C operating range)
- Dual independent flow channels: main path (0–10 L/min) and bypass path (0–1 L/min), each with dedicated proportional solenoid valves and closed-loop PID control
- 7-inch capacitive color touchscreen interface with intuitive icon-driven navigation, supporting multilingual menu options (English, Spanish, Chinese)
- Simultaneous real-time display of actual (in-situ) volumetric flow and standardized flow (NTP: 293.15 K, 101.325 kPa), eliminating manual correction calculations
- On-device digital calibration capability for flow, temperature, and pressure sensors using NIST-traceable reference standards
- Integrated rechargeable lithium-ion battery pack providing ≥8 hours of continuous operation without external power—critical for field calibration and mobile lab use
- Rugged aluminum alloy chassis with IP54-rated enclosure for dust and splash resistance in industrial environments
Sample Compatibility & Compliance
The GHK-7400 is validated for use with common calibration gases including but not limited to methane (CH₄), hydrogen sulfide (H₂S), carbon monoxide (CO), sulfur hexafluoride (SF₆), chlorine (Cl₂), benzene (C₆H₆), and hydrogen chloride (HCl). Its flow path materials (316L stainless steel, PTFE-sealed valves, and borosilicate glass flow tubes) ensure chemical compatibility and minimal adsorption for reactive and condensable species. The device complies with China’s national verification regulations referenced in its design specification—including JJG693-2011, JJG695-2019, JJG915-2008, JJF1263-2010, JJF1433-2013, JJF1674-2017, and JJF1888-2020—making it suitable for accredited calibration laboratories performing ISO/IEC 17025 audits. While not certified to ATEX or IECEx, it is intended for use in non-hazardous zones during instrument verification tasks.
Software & Data Management
The controller embeds firmware v3.2+ with internal data logging (up to 10,000 records) and USB-C export functionality for CSV-formatted reports containing timestamped flow, temperature, pressure, and user-defined test IDs. Optional PC software (GHK-ControlSuite™) enables remote configuration, automated sequence execution (e.g., multi-point flow ramp tests), and GLP-compliant audit trail generation—including operator login, parameter changes, and calibration event logs. All electronic records support metadata tagging for alignment with FDA 21 CFR Part 11 requirements when deployed in regulated quality systems. Firmware updates are delivered via signed binary packages with SHA-256 verification.
Applications
- Periodic verification of fixed gas detectors in petrochemical, semiconductor, and wastewater treatment facilities
- Factory acceptance testing (FAT) of new gas analyzers prior to site commissioning
- Field service calibration of portable multi-gas monitors used by safety officers and EHS personnel
- Research-grade flow stability assessment for gas sensor development labs
- Reference flow source in inter-laboratory comparison studies organized under CNAS accreditation frameworks
FAQ
What gases can be calibrated using the GHK-7400?
It supports calibration of instruments detecting CH₄, CO, H₂S, SF₆, Cl₂, C₆H₆, HCl, and other non-corrosive/non-condensing gases—provided compatible wetted materials are selected per application.
Does the GHK-7400 meet international metrological standards such as ISO 6145 or ISO 8573?
While designed to satisfy Chinese national verification regulations, its thermal mass flow sensor is traceably calibrated against ISO/IEC 17025-accredited reference standards; direct conformance to ISO 6145 series requires additional third-party validation per gas matrix.
Can the device be integrated into automated calibration systems?
Yes—via RS-232 and Modbus RTU serial protocols, enabling synchronization with PLCs, robotic handlers, or centralized calibration management platforms.
Is battery operation supported during active flow control?
Yes—the lithium-ion battery sustains full functionality—including dual-channel flow regulation, real-time compensation, and touchscreen operation—for ≥8 hours on a single charge.
How often does the GHK-7400 require recalibration?
Annual recalibration is recommended under normal usage; however, users may perform interim verification using certified check standards per JJF 1094–2002 guidelines.
