Junray ZR-3922 Environmental Air Particulate Matter (PM) Integrated Sampler — Heated (Model C) / Thermostatically Controlled (Model D)
| Brand | Junray |
|---|---|
| Origin | Shandong, China |
| Manufacturer Type | Original Equipment Manufacturer (OEM) |
| Model Variants | ZR-3922-C (Heated), ZR-3922-D (Thermostatically Controlled) |
| Flow Range | 60–130 L/min |
| Maximum Vacuum Pressure | >9 kPa |
| Flow Stability | ≤±5% over 1 h |
| Maximum Flow Error | ≤±5.0% |
| Operational Duration at Max Flow & Load | 2–8 h |
| Rated Service Life at Max Flow & 80% Load | >5,000 hours |
Overview
The Junray ZR-3922 Environmental Air Particulate Matter (PM) Integrated Sampler is a field-deployable, dual-mode ambient air monitoring instrument engineered for simultaneous gravimetric collection of total suspended particulates (TSP), PM10, and PM2.5, alongside absorption-based sampling of gaseous pollutants (e.g., SO2, NOx, NH3, ozone precursors). Its design adheres to the fundamental principle of standardized atmospheric sampling: maintaining precise volumetric flow control under variable environmental resistance while preserving sample integrity across temperature extremes. The ZR-3922-C variant integrates active heating of the inlet manifold and filter holder to prevent water vapor condensation and particle volatilization during cold/humid conditions; the ZR-3922-D variant employs a thermostatically regulated insulated chamber to stabilize filter temperature at user-selectable setpoints (typically 20–25 °C), minimizing hygroscopic growth artifacts in high-RH environments. Both configurations comply with core U.S. EPA-equivalent methodology frameworks as implemented in Chinese national standards, enabling data comparability in regulatory-grade ambient monitoring networks.
Key Features
- Triple-channel independent sampling architecture: supports concurrent operation of two particulate channels (e.g., PM2.5 + TSP) and one gaseous channel using impingers or sorbent tubes.
- High-efficiency brushless vacuum pump delivering stable flow up to 130 L/min against static backpressures exceeding 9 kPa — validated for continuous duty cycles at ≥80% rated load for >5,000 hours.
- 4.3-inch capacitive touchscreen display with physical keypad redundancy, enabling glove-compatible operation in adverse weather (rain, snow, dust storms).
- Integrated lithium-ion battery pack (standard) providing ≥4 h runtime at 100 L/min without AC power; supports rapid charging and seamless transition between power sources.
- Real-time flow control via high-accuracy, corrosion-resistant thermal mass flow sensors — calibrated for long-term stability in high-humidity (>95% RH) and low-temperature (−20 °C) conditions.
- Intelligent pump protection logic: automatic shutdown upon detection of filter clogging, inlet blockage, or sustained low-flow conditions (30 s).
- Configurable sampling protocols: programmable start/stop times, interval sampling (e.g., 1 h on / 1 h off), 24-hour unattended operation, and manual-triggered capture.
- Environmental parameter logging: integrated pressure transducer (imported, zero-drift compensated) and NTC thermistor for ambient temperature and barometric pressure measurement — both auto-compensated in volume calculation.
Sample Compatibility & Compliance
The ZR-3922 accommodates standard 47 mm and 90 mm quartz fiber, Teflon, or cellulose ester filters for PM gravimetric analysis, as well as 10–50 mL impinger vessels and multi-bed sorbent cartridges (e.g., silica gel, XAD-2, DNPH-coated) for gaseous species. All wet chemistry components are chemically inert and compatible with EPA TO-15, TO-17, and HJ 656-2013 extraction protocols. Regulatory compliance includes full alignment with HJ 618-2011 (PM10/PM2.5 gravimetry), HJ 93-2013 (performance specifications for PM samplers), HJ/T 374-2007 (TSP sampler requirements), and JJG 956-2013 (calibration verification procedures). Data acquisition meets GLP traceability requirements: each sample record stores timestamp, flow profile, temperature/pressure logs, battery voltage, and fault flags — all retained in non-volatile memory with write-protection.
Software & Data Management
Onboard firmware supports USB 2.0 mass storage mode for direct export of CSV-formatted raw data files containing second-by-second flow, temperature, pressure, and pump status. Optional GPRS module enables encrypted HTTP(S) transmission of summary reports (daily mean flow, cumulative volume, error events) to centralized LIMS or cloud platforms. Bluetooth 4.2 interface permits pairing with certified thermal printers for field-generated chain-of-custody labels. No proprietary software installation is required; configuration is fully managed via the embedded UI. Audit trails are immutable: all parameter changes, calibration events, and power interruptions are time-stamped and logged without overwrite capability — satisfying foundational elements of FDA 21 CFR Part 11 electronic record integrity.
Applications
- Regulatory ambient air quality monitoring networks (AAQMN) for PM2.5, PM10, and SO2/NOx compliance reporting.
- Source apportionment studies requiring co-located, time-synchronized particulate and gas-phase sampling.
- Indoor air quality (IAQ) assessments in occupational health settings per GBZ/T 189 series standards.
- Mobile monitoring campaigns using vehicle-mounted or tripod-deployed configurations.
- Method validation and inter-laboratory comparison exercises under CNAS-CL01 accreditation scope.
- Long-term trend analysis in remote or off-grid locations leveraging battery + solar hybrid power options.
FAQ
What filtration media are supported for PM2.5 sampling?
Standard 47 mm quartz fiber filters (e.g., Pallflex EFA-0600-210) and polytetrafluoroethylene (PTFE) membrane filters meeting HJ 656-2013 specifications.
Does the ZR-3922-D maintain filter temperature during sub-zero ambient conditions?
Yes — the thermostatic chamber actively heats to maintain setpoint (adjustable 15–30 °C) regardless of ambient temperature down to −20 °C, preventing thermal shock and moisture-induced mass artifacts.
Is flow calibration traceable to national standards?
Yes — factory calibration uses NIST-traceable primary standards; users may perform field verification with dry calibrators compliant with JJG 943-2011.
Can the instrument operate continuously for 7 days without intervention?
With external AC power and scheduled filter changes, yes — the 5,000+ hour pump service life and 16 GB internal storage support extended unattended deployment.
How is data integrity ensured during power loss?
All critical parameters (flow, time, pressure, temperature) are written to EEPROM every 10 seconds; interrupted samples resume automatically with preserved metadata upon power restoration.
