HuaShengPuXin QC-6H Dual-Channel Constant-Flow Ambient Air Sampler

Overview

The HuaShengPuXin QC-6H Dual-Channel Constant-Flow Ambient Air Sampler is an engineered solution for regulatory-compliant, time-integrated sampling of airborne contaminants in indoor and ambient environments. Designed in accordance with the technical requirements of GB 50325–2010 (Code for Indoor Environmental Pollution Control of Civil Building Engineering), this instrument employs closed-loop motor-speed-controlled constant-flow technology to maintain precise volumetric flow rates—regardless of filter loading, adsorbent bed resistance, or variable system backpressure up to 20,000 Pa. Unlike pressure-compensated or orifice-based samplers, the QC-6H actively regulates airflow by dynamically adjusting pump motor speed in real time, ensuring that the displayed flow value corresponds directly to the actual volumetric flow delivered to the sampling media—eliminating drift caused by filter clogging or temperature-induced gas density changes. Its dual-channel architecture enables simultaneous, independent sampling from two distinct locations or media types (e.g., active charcoal tubes and quartz fiber filters), supporting parallel analysis for method validation or multi-analyte workflows.

Key Features

• Dual independent sampling channels with synchronized or asynchronous timer control, each configurable within the 0.4–0.6 L/min range per GB 50325–2010 specifications.
• High-torque brushless DC motor coupled with adaptive PID flow regulation, delivering stable output even under extreme load conditions (≥0.6 L/min at 10,000 Pa; operational limit: 20,000 Pa).
• Integrated high-capacity 7.4 V lithium-ion battery pack (rated ≥6 h continuous operation), optimized for low self-discharge and thermal stability across −10 °C to +45 °C ambient ranges.
• Microprocessor-based timing module with <0.1% deviation over 1–99 min intervals—suitable for short-term exposure assessments and compliance-driven sampling protocols.
• Front-panel digital display with real-time flow readout, elapsed time, and battery status indicator—no external software required for basic operation.
• Robust aluminum alloy chassis and shock-absorbing elastomer feet ensure mechanical integrity during field transport and long-term benchtop deployment.

Sample Compatibility & Compliance

The QC-6H supports standard 37-mm and 47-mm diameter filter cassettes, sorbent tubes (e.g., Tenax TA, activated carbon, silica gel), and impingers compatible with EPA TO-17, NIOSH 1501/1600 series, and Chinese national standards including GB/T 18883–2002 and GB 50325–2010. Its certified flow accuracy (≤±5% at ≤6,000 Pa) and stability (≤5% over full runtime) meet the performance criteria outlined in ISO 16000-22 for indoor air quality monitoring and ASTM D5197 for formaldehyde sampling. While not intrinsically rated for hazardous area use, the device complies with GB 4793.1–2007 (equivalent to IEC 61010-1) for electrical safety in laboratory and field instrumentation. It is routinely deployed in third-party testing laboratories accredited to CNAS-CL01 (ISO/IEC 17025) for environmental testing.

Software & Data Management

The QC-6H operates as a standalone hardware platform without mandatory PC connectivity. However, optional RS-232 serial interface (available via accessory cable) permits integration with custom LabVIEW or Python-based data loggers for automated timestamped flow logging and remote start/stop triggering. All internal timer and flow settings are retained after power cycling. No embedded database or audit trail functionality is provided; users relying on 21 CFR Part 11 or GLP/GMP traceability must implement external electronic lab notebook (ELN) systems to record instrument ID, operator, sampling location, duration, and calibration history.

Applications

• Indoor air quality (IAQ) assessment per GB 50325–2010: formaldehyde, benzene, toluene, xylene, TVOC, and ammonia sampling using passive or active collection methods.
• Workplace air monitoring for volatile organic compounds (VOCs) and semi-volatile organic compounds (SVOCs) in manufacturing, renovation, and construction environments.
• Field validation of HVAC system efficiency through paired inlet/outlet sampling with gravimetric or thermal desorption analysis.
• Calibration verification of fixed-site air monitors by collecting reference samples at known flow rates and durations.
• Educational and research applications requiring reproducible, low-flow, time-weighted average (TWA) sampling under variable environmental resistance.

FAQ

Does the QC-6H require periodic recalibration? How often should it be verified?
Yes—flow verification against a NIST-traceable primary standard (e.g., bubble meter or calibrated mass flowmeter) is recommended before each sampling campaign or at least daily when used in regulated testing. Annual full recalibration by an accredited service provider is advised for CNAS or CMA accreditation maintenance.
Can the QC-6H operate continuously for 24 hours?
No—the built-in battery supports ≥6 hours of continuous operation. For extended 24-hour sampling, AC power must be used; the unit includes automatic AC/battery switchover logic to prevent interruption during power loss.
Is the flow accuracy maintained across the full operating temperature range?
The specified flow error (≤±5%) applies only within the 6,000 Pa backpressure limit and assumes ambient temperatures between 15–30 °C. At extremes (−10 °C or +45 °C), users should perform site-specific verification due to viscosity and density effects on volumetric flow.
What maintenance is required to sustain the 5000-hour rated service life?
Routine maintenance includes quarterly inspection of inlet filters, biannual cleaning of motor cooling vents, and annual replacement of the silicone diaphragm in the vacuum pump assembly—per the manufacturer’s service manual.
Does the QC-6H support flow adjustment below 0.4 L/min?
No—the firmware and mechanical design are optimized exclusively for the 0.4–0.6 L/min range mandated by GB 50325–2010. Lower flows would compromise flow stability and measurement repeatability under typical sampling resistances.