Junray ZR-3920G High-Negative-Pressure Ambient Air Particulate Sampler
| Brand | Junray |
|---|---|
| Origin | Shandong, China |
| Manufacturer Type | Direct Manufacturer |
| Model | ZR-3920G |
| Flow Range | 80–120 L/min |
| Load Capacity | >20 kPa at 100 L/min |
| Flow Stability | ≤±5% over 1 h |
| Maximum Flow Error | Better than ±2.5% |
| Operational Duration under Max Flow & Resistance | 2–8 h |
| Rated Service Life under Max Load | ≥5000 h |
Overview
The Junray ZR-3920G High-Negative-Pressure Ambient Air Particulate Sampler is an engineered field-deployable instrument designed for gravimetric and chemical speciation sampling of airborne particulate matter—including TSP, PM10, PM2.5, fluorides, heavy metals (e.g., Pb, As, Cd), and semi-volatile organic compounds (SVOCs)—under demanding environmental conditions. It operates on the principle of constant-flow isokinetic sampling, maintaining precise volumetric flow control across variable backpressure scenarios typical of high-resistance filter media (e.g., quartz fiber, PTFE, polyvinyl chloride, and PU-fortified sorbent cartridges). Its core architecture integrates a brushless DC vacuum pump capable of sustaining ≥20 kPa static pressure at 100 L/min, enabling reliable collection through dense substrates such as quartz filters loaded with acidic digestions or PUF/XAD-2 resin traps for polycyclic aromatic hydrocarbons (PAHs) and organochlorines. The system complies with fundamental physical sampling requirements defined in ISO 7708 (airborne particles—size-selective sampling criteria), while its operational protocols align with U.S. EPA Method TO-13A (SVOCs), EPA IO-3.2 (PM2.5 gravimetric), and equivalent regulatory frameworks including EU EN 12341 (PM10/PM2.5) and Chinese HJ standards referenced in its design validation.
Key Features
- High-efficiency brushless vacuum pump with rated service life ≥5000 h at 80% load capacity and proven stability under sustained high-backpressure operation (≥20 kPa at 100 L/min)
- Integrated electronic mass flow controller with corrosion-resistant thermal sensor elements; accuracy better than ±2.5% of full scale, stability ≤±5% over 60-minute intervals
- Real-time compensation for ambient temperature and barometric pressure using calibrated digital sensors; automatic standard-cubic-meter (std m³) volume calculation per ISO 10780 and HJ 618–2011
- 5-inch industrial-grade capacitive touchscreen interface supporting multi-language UI, intuitive parameter configuration, and real-time graphical display of flow, pressure, elapsed time, and battery status
- Ruggedized IP54-rated enclosure with reinforced impact-resistant housing, sealed gasketing, and moisture-tolerant internal circuitry—validated for continuous operation in rain, snow, dust storms, and high-humidity haze conditions
- Configurable modular inlet assembly compatible with standardized TSP, PM10, PM2.5, fluoride (cellulose acetate-nitrate), heavy metal (polyvinyl chloride), and SVOC (PUF/XAD-2) sampling heads per HJ 93–2013 and HJ 656–2013
Sample Compatibility & Compliance
The ZR-3920G accommodates a broad spectrum of certified filter and sorbent media used in regulatory air monitoring programs. It supports quartz fiber filters for elemental analysis (ICP-MS per HJ 657–2013), PTFE membranes for low-blank metal determination, cellulose acetate-nitrate (CAN) filters for fluoride ion quantification via ion-selective electrode (ISE) per HJ 955–2018, and polyurethane foam (PUF) cartridges impregnated with XAD-2 resin for SVOC enrichment (per HJ 691–2014). All sampling configurations adhere to geometric and aerodynamic cut-point tolerances specified in HJ/T 374–2007 and JJG 943–2011. Data acquisition meets GLP traceability requirements: timestamps, flow logs, pressure/temperature readings, and error flags are stored with microsecond-level resolution and immutable metadata tagging. Firmware implements audit-trail logging compliant with principles analogous to FDA 21 CFR Part 11 for electronic records integrity.
Software & Data Management
Internal non-volatile memory stores ≥12 months of minute-interval sampling metadata, including instantaneous flow rate, differential pressure, ambient T/P, and system diagnostics. Data export is supported via USB 2.0 interface in both plain-text (.txt) and comma-separated values (.csv) formats—structured for direct ingestion into LIMS platforms (e.g., Thermo Fisher SampleManager, LabVantage) or statistical analysis tools (R, Python pandas). Optional thermal printer module provides on-site hardcopy of session summaries with QR-coded batch identifiers. Firmware updates are performed offline via encrypted firmware image files; version control and checksum verification ensure integrity. No cloud connectivity or remote telemetry is implemented—data sovereignty and network isolation are preserved by design.
Applications
This sampler serves as a primary collection platform in national ambient air quality monitoring networks (NAAQMN), occupational hygiene assessments (OSHA/NIOSH-compliant exposure studies), source apportionment investigations (e.g., industrial stack characterization, traffic emissions profiling), and research-grade aerosol process studies (cloud condensation nuclei generation, secondary organic aerosol formation). Its high negative-pressure capability enables extended-duration sampling campaigns in low-permeability environments—such as indoor air quality surveys with activated carbon filtration, fugitive dust monitoring at mining sites, or long-term background station deployments in mountainous or coastal regions where filter loading resistance increases progressively over multi-hour cycles.
FAQ
What filter types are validated for use with the ZR-3920G?
Quartz fiber, PTFE, polyvinyl chloride (PVC), cellulose acetate-nitrate (CAN), and polyurethane foam (PUF) with or without XAD-2 resin—each qualified per relevant HJ, EPA, or ISO method specifications.
Does the instrument support automatic flow correction during filter clogging?
Yes—the closed-loop flow control system continuously adjusts motor speed to maintain setpoint within ±2.5% tolerance despite rising filter resistance up to 20 kPa.
Is calibration traceable to national standards?
Flow sensor calibration is performed against NIM-certified primary standards; pressure and temperature sensors are factory-traceable to CNAS-accredited references per JJG 943–2011.
Can the device operate unattended for 24 hours?
Yes—programmable scheduling supports continuous, interval, or timed sampling modes; power interruption recovery preserves all settings and resumes from last valid timestamp.
What environmental certifications does the housing meet?
IP54 ingress protection rating (dust-protected, splash-resistant); mechanical shock testing per IEC 60068-2-27; operating temperature range: −20 °C to +50 °C.
