Junray ZR-3925 Ambient Air Semi-Volatile Organic Compounds (SVOCs) Sampler
| Brand | Junray |
|---|---|
| Model | ZR-3925 |
| Origin | Shandong, China |
| Manufacturer Type | Direct Manufacturer |
| Regional Classification | Domestic (China) |
| Pricing | Upon Request |
Overview
The Junray ZR-3925 Ambient Air Semi-Volatile Organic Compounds (SVOCs) Sampler is a field-deployable, multi-parameter atmospheric sampling system engineered for regulatory-grade collection of semi-volatile organic compounds (SVOCs), inorganic fluorides, and trace metals from ambient air. It operates on the principle of active filtration and adsorption—drawing air through standardized filter media (e.g., quartz fiber, PTFE, or polyurethane foam) and sorbent cartridges under precisely controlled volumetric flow conditions. Designed to meet stringent Chinese environmental monitoring standards—including HJ 691-2014 (Technical Guidelines for SVOC Sampling), HJ 955-2018 (Fluoride by Ion-Selective Electrode), and HJ 657-2013 (Metals by ICP-MS)—the instrument supports both gravimetric and chemical analysis workflows downstream. Its dual-path architecture enables simultaneous or sequential sampling of particulate matter (TSP, PM10, PM2.5) and gaseous/adsorbed-phase pollutants, making it suitable for long-term ambient air quality networks, source apportionment studies, and compliance monitoring in urban, industrial, and background sites.
Key Features
- Robust all-weather enclosure rated IP54: fully waterproof, dustproof, and impact-resistant—validated for continuous operation during rain, snow, sandstorms, and heavy haze conditions.
- High-performance brushless sampling pump: capable of sustained 50 L/min flow against ≥20 kPa backpressure; certified mean time between failures (MTBF) >20,000 hours.
- Intelligent flow control system: integrates corrosion-resistant, humidity-tolerant electronic mass flow meter with automatic temperature and barometric pressure compensation; calculates standardized volume (at 273.15 K, 101.325 kPa) in real time.
- Modular sampling head compatibility: accepts interchangeable heads for TSP, PM10, PM2.5, fluoride (using cellulose acetate nitrate membrane), heavy metals (using polyvinyl chloride membrane), and SVOCs (using PUF/XAD resin stacks).
- Power failure resilience: automatic data retention and resume-on-power restoration—no loss of time-stamped flow logs or cumulative volume records.
- 5-inch capacitive color touchscreen interface: intuitive menu navigation, real-time graphical display of flow rate, pressure drop, battery status, and remaining sampling duration.
Sample Compatibility & Compliance
The ZR-3925 supports a comprehensive range of EPA- and ISO-aligned media: quartz fiber filters (for OC/EC analysis), PTFE membranes (for metal speciation), polyurethane foam (PUF) and XAD-2 resin cartridges (for PAHs, PCBs, phthalates per HJ 646-2013, HJ 902-2017, and HJ 868-2017), and cellulose acetate nitrate filters (for fluoride per HJ 955-2018). All sampling configurations comply with HJ 93-2013 (PM sampler performance criteria), HJ 618-2011 (gravimetric PM determination), and HJ/T 374-2007 (TSP sampler specifications). The system’s flow accuracy (±2% of setpoint), pressure sensor resolution (±0.1 kPa), and temperature measurement uncertainty (±0.5 °C) satisfy GLP-aligned validation requirements for method-defined sampling protocols.
Software & Data Management
Internal firmware logs second-by-second flow, temperature, pressure, and pump duty cycle to non-volatile memory. Data export is supported via USB 2.0 in two interoperable formats: ASCII-delimited TXT (for legacy lab information systems) and CSV (compatible with Excel, R, Python pandas, and LIMS platforms). Optional thermal printer module provides on-site hardcopy of calibration certificates and sampling reports. All stored files include embedded timestamps, instrument ID, operator code, and sampling configuration metadata—enabling full traceability per ISO/IEC 17025 and supporting audit readiness for QA/QC reviews.
Applications
- Ambient air monitoring networks requiring concurrent PM and SVOC measurement per national reference methods.
- Source characterization studies targeting polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), organophosphate flame retardants (OPFRs), and phthalate esters.
- Industrial fence-line monitoring where co-emission of metals (Pb, As, Cd) and fluorides must be quantified alongside organic aerosols.
- Research campaigns evaluating atmospheric aging of SVOCs and their partitioning between gas and particle phases.
- Method validation and inter-laboratory comparison exercises involving HJ 691-2014–compliant field sampling procedures.
FAQ
What filter and sorbent media are validated for use with the ZR-3925?
Quartz fiber filters (for OC/EC), PTFE membranes (for elemental analysis), cellulose acetate nitrate (for fluoride), PVC membranes (for metals), and PUF/XAD-2 resin cartridges (for SVOCs) are all verified per applicable HJ standards.
Does the instrument support automated calibration verification?
Yes—the integrated electronic flow meter allows pre- and post-sampling calibration checks using a NIST-traceable primary standard; calibration logs are stored with each sampling event.
Is the ZR-3925 compliant with international standards such as ISO 12103-1 or EN 12341?
While designed to meet Chinese HJ-series standards, its physical sampling geometry, flow stability, and filter holder dimensions align with ISO 12103-1 (test dust) and EN 12341 (PM10/PM2.5) mechanical equivalence requirements for comparative studies.
Can the unit operate unattended for 24-hour continuous sampling?
Yes—programmable timer supports fixed-duration, interval-based, or round-the-clock sampling; internal battery backup sustains clock and memory during brief outages.
What data security and audit trail features does the system provide?
All measurements are timestamped and immutable once logged; no user-editable fields exist in raw data files—supporting FDA 21 CFR Part 11–aligned data integrity principles when used in regulated environments.
