HUANKONG GHK-1140 Quad-Channel Constant-Temperature Air Sampler

Overview

The HUANKONG GHK-1140 Quad-Channel Constant-Temperature Air Sampler is a precision-engineered environmental sampling instrument designed for regulatory-compliant, long-term ambient air monitoring of gaseous pollutants—including volatile organic compounds (VOCs), benzene homologues, sulfur dioxide, nitrogen oxides, and other respirable analytes. It operates on the principle of controlled-volume, isokinetic sampling under stabilized thermal and volumetric conditions—ensuring representative collection of airborne species onto sorbent tubes, impingers, or filter media. Its quad-channel architecture enables simultaneous, independent sampling across four discrete locations or analytical targets, significantly improving field efficiency while maintaining traceable metrological integrity. The system complies with core Chinese environmental standards including HJ/T 375–2007, HJ/T 376–2007, JJG 956–2013, HJ 584–2010, and GB/T 18883–2022—making it suitable for use in ambient air quality monitoring networks, indoor air quality (IAQ) assessments, occupational hygiene surveys, and pre-analytical preparation for GC, GC-MS, or HPLC-based quantification.

Key Features

• Four independent sampling channels, each programmable with user-defined start/stop times, duration, flow rate, and temperature setpoint
• PID-controlled mass flow regulation using high-accuracy thermal mass flow sensors (0.1–1.0 L/min range), delivering ≤±2% full-scale stability across variable backpressures (50–110 kPa)
• Constant-temperature incubation chamber with adjustable setpoint (0–45 °C), maintained via Peltier-based thermoelectric control and real-time feedback loop
• Low-noise, brushless DC sampling pump with extended service life (>10,000 hours MTBF) and high suction capacity up to 110 kPa vacuum
• Dual OLED display interface: one screen dedicated to thermal parameters (ambient/sampling temperature, setpoint, deviation), the other to operational metrics (instantaneous flow, cumulative standard-volume, elapsed time, battery status)
• Integrated environmental compensation: automatic measurement and correction of sampled volume to standard conditions (0 °C, 101.325 kPa) using real-time temperature and barometric pressure inputs
• 2 µm dual-stage particulate filtration upstream of the pump and flow sensor—minimizing contamination, drift, and maintenance frequency
• Telescoping stainless-steel sampling mast (adjustable height: 0.8–1.8 m) with quick-lock mechanism for rapid deployment and height optimization
• Non-volatile memory retains all sampling metadata—including timestamps, flow logs, temperature profiles, and error flags—even during unexpected AC loss
• Bluetooth 4.2 wireless interface supports secure pairing with certified thermal printers for on-site report generation (PDF or CSV format)

Sample Compatibility & Compliance

The GHK-1140 is validated for use with standard EPA/ISO-compliant sampling media, including Tenax TA, Carbopack X, activated charcoal tubes, silica gel impingers, and quartz fiber filters. Its constant-flow and temperature-stabilized operation meets the technical requirements for method validation under HJ 584–2010 (benzene series analysis) and aligns with ISO 16000-6:2011 (indoor air—determination of VOCs). While primarily deployed in domestic regulatory frameworks, its metrological performance—particularly flow accuracy, thermal uniformity, and data traceability—supports alignment with GLP principles and audit readiness for laboratories operating under CNAS accreditation (equivalent to ISO/IEC 17025). All firmware and calibration records are timestamped and stored with immutable metadata, facilitating internal QA review and external inspection.

Software & Data Management

Data acquisition and configuration are managed locally via the onboard menu-driven interface; no PC dependency is required for routine operation. Each channel logs time-synchronized entries containing: sampling start/stop time, average and instantaneous flow (L/min), actual and setpoint temperature (°C), barometric pressure (kPa), calculated standard-volume (L at STP), and system diagnostic codes. Stored datasets exceed 500 entries per channel and support export via Bluetooth to compatible mobile applications or desktop software (SDK available upon request). All logged values are automatically tagged with GPS-coordinates when paired with an external GNSS receiver (optional accessory). The embedded firmware implements write-once logging behavior—preventing post-hoc modification—and maintains a separate audit trail of parameter changes, user logins, and calibration events.

Applications

• Ambient air quality monitoring stations (urban, rural, roadside)
• Indoor air quality assessment in schools, hospitals, offices, and residential buildings per GB/T 18883–2022
• Workplace exposure monitoring for VOCs, aldehydes, and aromatic hydrocarbons
• Method development and validation for sorbent tube–based GC analysis
• Source identification studies requiring spatially resolved, time-synchronized sampling
• Calibration verification of fixed gas detectors and continuous emission monitoring systems (CEMS)

FAQ

What standards does the GHK-1140 comply with?

It conforms to HJ/T 375–2007, HJ/T 376–2007, JJG 956–2013, HJ 584–2010, and GB/T 18883–2022—covering design, performance testing, calibration, and application-specific validation.
Can the unit operate unattended for 24 hours?

Yes. Designed as a 24-hour constant-temperature/constant-flow sampler, it supports scheduled sampling cycles up to 99 hours with battery backup and auto-resume functionality after power recovery.
Is flow calibration traceable to national standards?

Factory calibration is performed using NIST-traceable primary flow standards; users may perform field verification with portable calibrators compliant with ISO 6145-1.
Does the instrument support external power supply and battery operation?

It operates on AC 220 V ±10%, 50 Hz, and includes a rechargeable Li-ion battery pack providing ≥6 hours of continuous operation at 0.5 L/min and 25 °C.
How is data integrity ensured during extended deployments?

All measurements are written to non-volatile flash memory with CRC-32 checksum validation; power-loss recovery preserves both active sampling state and historical logs without corruption.