Junray ZR-3924 Multi-Channel Ambient Air Particulate & Gaseous Sampler
| Brand | Junray |
|---|---|
| Model | ZR-3924 |
| Origin | Shandong, China |
| Manufacturer Type | Direct Manufacturer |
| Instrument Category | Domestic |
| Instrument Type | 24-Hour Constant-Temperature Constant-Flow Air Sampler |
| Configuration | 4-Channel Gaseous Sampling + 1-Channel Particulate Sampling |
| Flow Range | 0.1–1.5 L/min (gaseous channels), up to 100 L/min (particulate channel) |
| Maximum Load Capacity | >6 kPa at 100 L/min |
| Flow Stability | ≤±5% over 1 h |
| Flowmeter Accuracy | ≤±2% FS |
| Pump Service Life | >5,000 h under rated load (80% of max flow & resistance) |
| Compliance Standards | HJ 93–2013, HJ 618–2011, HJ 656–2013, HJ/T 374–2007, HJ/T 375–2007, JJG 943–2011, JJG 956–2013, HJ 583–2010, HJ 584–2010, HJ 644–2013, HJ 645–2013 |
Overview
The Junray ZR-3924 Multi-Channel Ambient Air Particulate & Gaseous Sampler is an integrated, field-deployable environmental monitoring instrument engineered for simultaneous, gravimetric-based collection of total suspended particulates (TSP), PM10, and PM2.5, alongside concurrent gaseous pollutants via solution absorption, solid-phase adsorption, or thermal desorption methods. Its operational principle relies on precise volumetric flow control through calibrated orifice-based or electronic mass flow sensors, coupled with standardized inertial separation (via aluminum alloy TSP/PM10/PM2.5 impactors per HJ 93–2013) and regulated temperature-controlled sampling manifolds. Designed to meet the stringent metrological and procedural requirements of Chinese national standards—including HJ 656–2013 for manual PM2.5 gravimetric monitoring—the ZR-3924 supports regulatory compliance in ambient air quality networks, source emission verification, occupational hygiene assessments, and indoor air quality surveys.
Key Features
- Four independent, programmable gaseous sampling channels (0.1–1.5 L/min) and one high-flow particulate channel (up to 100 L/min), each with isolated flow control and real-time monitoring.
- High-efficiency brushless vacuum pump capable of sustaining ≥6 kPa backpressure at 100 L/min; validated service life exceeds 5,000 hours under continuous 80% load conditions.
- Integrated five-point automatic flow calibration system with traceable electronic flowmeters (±2% FS accuracy), resistant to corrosion and high humidity exposure.
- 4.3-inch full-color capacitive touchscreen interface with intuitive navigation, multilingual UI support (English firmware optional), and contextual help prompts.
- Robust enclosure rated IP54: dust-tight, rain-resistant, electrostatic-dissipative, and impact-absorbing—validated for operation in extreme field environments including heavy fog, snowfall, sandstorms, and high-humidity coastal zones.
- Built-in rechargeable Li-ion battery enabling ≥4 hours of uninterrupted operation without AC power; smart charge management prevents overcharge and thermal runaway.
- Real-time ambient pressure and temperature measurement using factory-calibrated, maintenance-free piezoresistive pressure sensor (±0.5 kPa) and NTC thermistor (±0.3°C).
- Automatic power-fail recovery: all sampling parameters, accumulated volume, and timestamps are preserved in non-volatile memory; resumed sampling upon re-powering maintains continuity and audit integrity.
- Comprehensive data logging: stores >100,000 records of instantaneous flow, pressure, temperature, pump status, and user actions with UTC-synchronized timestamps.
Sample Compatibility & Compliance
The ZR-3924 accommodates standard 47-mm and 90-mm quartz fiber or PTFE membrane filters for gravimetric analysis of TSP, PM10, and PM2.5 per HJ 618–2011 and HJ 656–2013. For gaseous analytes, it supports impingers (e.g., for SO2, NOx), stainless-steel or glass adsorption tubes (e.g., Tenax TA, Carbopack B, activated carbon), and diffusion scrubbers—all compatible with downstream analytical workflows including IC, GC-FID/ECD, GC-MS, and ICP-MS. All hardware and firmware comply with metrological traceability requirements outlined in JJG 943–2011 and JJG 956–2013. The device supports GLP-aligned data governance: audit trails record configuration changes, calibration events, user logins, and firmware updates; data export adheres to CSV/Excel formats suitable for LIMS integration.
Software & Data Management
Data acquisition and configuration are managed via embedded firmware compliant with ISO/IEC 17025 documentation principles. Field-collected data are stored with immutable timestamps synchronized via北斗 (BeiDou) GNSS time signal or NTP over 4G LTE (optional). USB 2.0 host port enables direct data dump to external storage; Bluetooth 5.0 supports wireless printing of calibration reports and sample logs with QR-coded metadata (including filter ID, location, operator, and QC flags). Remote diagnostics and firmware updates are supported via secure HTTPS API endpoints. All logged parameters—including flow deviation history, pressure drop across filters, and pump duty cycle—are exportable for trend analysis and QA/QC review per HJ/T 375–2007 Annex D.
Applications
- Ambient air quality monitoring networks (national, provincial, and municipal stations)
- Source apportionment studies requiring co-located particulate and VOC speciation (e.g., benzene, toluene, xylene per HJ 583–2010/HJ 584–2010)
- Indoor air quality assessment in schools, hospitals, and commercial buildings
- Occupational exposure monitoring per GBZ 159–2004 and OSHA Method 0500
- Method validation and inter-laboratory comparison exercises under CNAS accreditation
- Mobile monitoring platforms (vehicle-mounted or drone-deployed configurations with external power conditioning)
FAQ
Does the ZR-3924 meet U.S. EPA or EU EN standards for PM monitoring?
The ZR-3924 is designed and verified against Chinese national standards (HJ series). While its physical separation performance aligns with ISO 7708 for aerodynamic cut-points, formal equivalency to EPA Reference/Equivalent Methods or EN 12341 requires third-party validation in accordance with local regulatory protocols.
Can the instrument perform sequential sampling across multiple pollutants without manual intervention?
Yes—programmable multi-stage sampling allows timed switching between gaseous and particulate modes, including staggered start/stop, interval-based cycles, and conditional triggers based on ambient pressure or temperature thresholds.
Is remote data retrieval possible without physical USB access?
Yes—integrated 4G LTE module enables encrypted MQTT or HTTP(S) transmission of summary metrics and alarm events to cloud-based dashboards; raw data files require USB or Bluetooth transfer per data sovereignty policies.
What maintenance intervals are recommended for the flow calibration system?
Electronic flow sensors require no routine recalibration per manufacturer specification; however, annual verification against a NIST-traceable primary standard (e.g., dry calibrator or bubble meter) is advised for GLP-compliant operations.
How is filter weighing integrity ensured during transport from field to lab?
The sampler supports pre- and post-sampling filter ID tagging via QR code; optional humidity-controlled transport cases (not included) mitigate hygroscopic gain—consistent with HJ 656–2013 Section 6.3.2 handling protocols.
