HUANKONG GHK-1302H Dual-Channel VOC Sampling System

Overview

The HUANKONG GHK-1302H Dual-Channel VOC Sampling System is a precision-engineered, field-deployable gas sampling instrument designed for compliant manual collection of volatile organic compounds (VOCs), sulfur dioxide (SO₂), nitrogen oxides (NOₓ), chlorine (Cl₂), hydrogen sulfide (H₂S), and other regulated gaseous pollutants from ambient air and stationary emission sources. It operates on the principle of controlled volumetric aspiration through sorbent-packed sampling tubes—enabling quantitative capture under standardized thermodynamic conditions required for subsequent thermal desorption and GC-MS analysis. Engineered to meet the rigorous operational and metrological requirements of Chinese environmental monitoring standards—including HJ/T 194–2017 (Manual Monitoring Technical Specifications for Ambient Air Quality), HJ 644–2013 (VOCs Determination in Ambient Air via Sorbent Tube Sampling–Thermal Desorption–GC-MS), and HJ 734–2014 (VOCs Determination in Stationary Source Emissions via Solid Phase Adsorption–Thermal Desorption–GC-MS)—the GHK-1302H delivers trace-level sample integrity with high reproducibility across extended 24-hour sampling campaigns.

Key Features

• Dual independent sampling channels with fully isolated flow paths—each channel supports independent digital flow setpoint configuration (range: 0.01–1.0 L/min, resolution: 0.01 L/min) and real-time feedback control.
• Closed-loop mass flow regulation architecture ensures stable flow performance unaffected by line voltage fluctuations, filter loading, or variable backpressure—critical for low-flow (<0.2 L/min) adsorbent tube applications.
• Integrated environmental sensor suite measures and logs ambient temperature (±0.5 °C), atmospheric pressure (±0.5 kPa), and pre-sampler pressure differential—automatically calculating normalized volume at standard conditions (273.15 K, 101.325 kPa) per HJ/T 194–2017 Annex B.
• Automated pneumatic integrity verification sequence applies calibrated positive pressure to each channel and monitors decay rate over time—flagging leaks exceeding allowable thresholds prior to sample acquisition.
• Color capacitive touchscreen interface with intuitive icon-driven navigation; supports multilingual UI localization (English, Chinese, Spanish) via firmware update.
• Built-in rechargeable lithium-ion battery (14.8 V / 8.4 Ah) enables continuous operation up to 12 h at 0.2 L/min per channel; compatible with universal USB-C power delivery (PD) adapters and portable power banks meeting IEC 62684 specifications.
• Real-time flow deviation monitoring triggers automatic sampling halt and data preservation when measured flow deviates >±10% from setpoint for ≥60 seconds—ensuring regulatory defensibility of collected datasets.

Sample Compatibility & Compliance

The GHK-1302H is validated for use with industry-standard sorbent media including Tenax TA®, Carbopack™ X, and mixed-bed tubes (e.g., SKC Ultra™). Its dual-channel design permits simultaneous parallel sampling for method validation, blank correction, or multi-analyte fractionation strategies. All firmware logic, data logging timestamps, and calibration event records adhere to ALCOA+ principles (Attributable, Legible, Contemporaneous, Original, Accurate, Complete, Consistent, Enduring, Available) as defined in WHO TRS 992 Annex 4 and aligned with GLP audit expectations. While not certified to ISO/IEC 17025:2017 as a testing laboratory, the instrument’s hardware architecture and embedded firmware support full traceability for laboratories operating under CNAS-CL01 or equivalent accreditation frameworks.

Software & Data Management

Field-collected data are stored in non-volatile memory with timestamped entries (YYYY-MM-DD HH:MM:SS), including ambient parameters, flow profiles, tube identifiers, and calculated standard volumes. A dedicated PC application (Windows/macOS/Linux compatible) enables secure export via USB-C connection using encrypted CSV format with SHA-256 hash verification. Audit trail functionality logs all user-initiated actions—including flow changes, calibration events, and system resets—with immutable timestamps. Data files include embedded metadata headers compliant with EPA Method TO-17 and EU EN 13649-1 reporting conventions.

Applications

• Ambient air quality monitoring networks conducting routine VOC speciation per national reference methods.
• Stationary source compliance testing at chemical manufacturing, coating, printing, and semiconductor facilities.
• Indoor air quality assessments in occupational health and building commissioning studies.
• Method development and validation labs requiring synchronized dual-channel sampling for recovery experiments or inter-laboratory comparison studies.
• Mobile monitoring platforms where low-power, battery-operated, and vibration-resistant instrumentation is essential.

FAQ

What sorbent tube formats are supported by the GHK-1302H?
Standard 6 mm OD × 90 mm length stainless steel or glass tubes packed with single- or multi-bed sorbents (e.g., Tenax TA, Carbopack C/X, Graphitized Carbon Black) — compatible with all major thermal desorption autosamplers.
Does the instrument support remote monitoring or telemetry?
No built-in cellular or Wi-Fi module; however, optional external IoT gateways can be integrated via RS-232 or TTL serial output for centralized fleet management.
Is firmware upgrade capability available?
Yes—upgrades are delivered via signed binary packages loaded through USB-C; version history and cryptographic signatures are verifiable within the system diagnostics menu.
How is calibration traceability maintained?
Each unit ships with a factory calibration certificate referencing NIST-traceable flow standards (Fluke DP-300 series); users may perform field verification using primary calibrators such as dry cal gas meters or electronic bubble flowmeters per ISO 6145-1.
Can the GHK-1302H operate unattended for full 24-hour cycles?
Yes—when powered by AC adapter or high-capacity external power bank (>20,000 mAh), continuous dual-channel operation at 0.2 L/min is achievable without interruption; battery runtime scales inversely with flow rate and ambient temperature.