Junray ZR-3930B Single-Filter Ambient Air Particulate Matter Sampler

Overview

The Junray ZR-3930B Single-Filter Ambient Air Particulate Matter Sampler is a field-deployable, high-reliability instrument engineered for regulatory-grade gravimetric monitoring of PM₁₀ and PM_2.5 in ambient air. It operates on the principle of isokinetic, constant-flow filtration—drawing ambient air through a certified size-selective inlet (e.g., EPA-designated PM₁₀ or PM_2.5 cyclone or impactor) onto a pre-weighed quartz or Teflon filter membrane. The sampler complies with U.S. EPA Reference Method equivalency criteria and meets all technical requirements stipulated in China’s HJ 93–2013, HJ 618–2011, and HJ 656–2013 standards for manual particulate monitoring. Its design prioritizes metrological integrity under real-world environmental stressors—including rain, snow, high humidity (>95% RH), dust storms, and persistent haze—without flow deviation or mechanical failure.

Key Features

• Integrated self-locking, vibration-damped filter holder module ensuring leak-tight sealing, minimal mechanical disturbance to deposited particulates, and rapid, tool-free membrane exchange—critical for minimizing mass loss during handling.
• Ruggedized IP65-rated enclosure with reinforced shock-absorbing housing, enabling continuous operation in unsheltered outdoor environments across all four seasons.
• High-efficiency brushless DC sampling pump capable of sustaining 16.7 L/min against static backpressures exceeding 35 kPa—validated under worst-case filter loading conditions per HJ 93–2013 Annex B.
• Intelligent flow control system with real-time obstruction detection and automatic low-flow shutdown to prevent invalid sample volumes and preserve data traceability.
• 4-inch industrial-grade TFT LCD display with wide-temperature operating range (–20 °C to +50 °C), sunlight-readable contrast, and intuitive menu navigation for field technicians.
• Corrosion-resistant, humidity-stable thermal mass flow sensor with NIST-traceable calibration; maintains ±2.5% full-scale accuracy across 0–95% RH and –10 °C to +40 °C ambient ranges.
• Onboard environmental sensor suite measuring and logging barometric pressure (±0.1 kPa), ambient temperature (±0.3 °C), and relative humidity (±2% RH) synchronized with volumetric flow data.

Sample Compatibility & Compliance

The ZR-3930B supports standard 47-mm or 90-mm circular filters (quartz fiber, PTFE, or cellulose ester) compatible with gravimetric analysis per ISO 12103-1, US EPA Method IO-3.1, and HJ 618–2011. When paired with an EPA-certified PM_2.5 or PM₁₀ size-selective inlet (e.g., WINS, BGI SCC 1.062, or equivalent), it satisfies QA/QC requirements for reference method comparison in air quality monitoring networks. All firmware and data logging routines comply with GLP-aligned audit trail principles—each sample record includes timestamp, flow history, pressure/temperature/humidity metadata, and operator ID (if enabled). Data files adhere to HJ 656–2013-defined CSV/TXT schema for seamless integration into national air quality data platforms (e.g., CNEMC AQS).

Software & Data Management

Internal non-volatile memory stores ≥10,000 time-stamped records (1-min resolution), including instantaneous flow, cumulative volume, and environmental parameters. USB 2.0 interface enables direct export of raw datasets in both human-readable TXT and machine-parsable CSV formats—fully compatible with Excel, R, Python pandas, and air quality data validation software (e.g., EPA AIRNow QA tools). Firmware supports optional Bluetooth 4.2 connectivity for wireless configuration and remote status polling via Android/iOS companion app (sold separately). No cloud dependency: all data remains locally controlled and exportable without proprietary lock-in.

Applications

• Reference-grade PM₁₀/PM_2.5 intercomparison studies between automated beta attenuation monitors (BAM) and gravimetric methods.
• Field QA/QC audits for urban, rural, and roadside ambient air monitoring stations.
• Source apportionment campaigns requiring high-fidelity filter samples for subsequent XRF, IC, or OC/EC analysis.
• Long-term trend analysis in compliance with China’s “Blue Sky Defense War” monitoring protocols and provincial environmental protection bureau directives.
• Calibration verification of low-cost sensor networks using collocated reference samplers.

FAQ

Does the ZR-3930B meet U.S. EPA equivalency requirements for PM_2.5 monitoring?
Yes—when configured with an EPA-recognized size-selective inlet and operated per 40 CFR Part 53 protocols, its performance aligns with FRM/FEM criteria for flow accuracy, stability, and environmental robustness.
What power options are available for extended unattended operation?
Standard configuration includes a removable 12 V / 10 Ah lithium-ion battery pack (rated for ≥8 h at 16.7 L/min under moderate resistance); AC adapter and solar-charging kits are optional accessories.
Is the internal data logger compliant with 21 CFR Part 11 for regulated laboratories?
While not FDA-validated out-of-box, the device supports ALCOA+ data integrity principles (Attributable, Legible, Contemporaneous, Original, Accurate); optional firmware upgrade enables electronic signature and audit trail logging for GxP environments.
Can the ZR-3930B be used for total suspended particulates (TSP) sampling?
Yes—by substituting the PM₁₀/PM_2.5 inlet with a TSP nozzle per JJG 943–2011, and adjusting flow calibration accordingly.
How is flow calibration verified in the field?
The unit includes a built-in zero-check and span-check function compatible with primary-standard dry calibrators (e.g., Gilibrator, Mesa Labs DryCal); calibration certificates are provided with each instrument.