Junray ZR-3923 Ambient Air Particulate Matter Integrated Sampler (Model A, Temperature-Controlled)

Overview

The Junray ZR-3923 Ambient Air Particulate Matter Integrated Sampler (Model A, Temperature-Controlled) is a field-deployable, multi-mode environmental sampling platform engineered for simultaneous and sequential collection of airborne particulate matter (TSP, PM₁₀, PM_2.5) and gaseous pollutants. It operates on the gravimetric principle for particulates—using standardized filter media—and supports solution absorption, solid-phase adsorption (e.g., activated carbon, Tenax TA, silica gel), and thermal desorption-compatible sampling for volatile organic compounds (VOCs), semi-volatile organics (SVOCs), and inorganic gases. Designed to meet the operational rigor of regulatory monitoring networks, research-grade atmospheric studies, and occupational hygiene assessments, the ZR-3923 complies with core Chinese environmental standards—including HJ 93-2013 (PM₁₀/PM_2.5 sampler technical requirements), HJ 618-2011 (gravimetric determination), and HJ 644/645/656 (VOC and halocarbon methodologies)—and aligns structurally with international design conventions for ambient air samplers per ISO 7708 (particle size-selective inlets) and EPA Compendium Method TO-17.

Key Features

• Temperature-stabilized sampling chamber (Model A): Maintains consistent filter temperature across ambient conditions (−20 °C to +50 °C), minimizing hygroscopic artifact and improving mass stability for gravimetric analysis.
• Five-channel independent sampling architecture: Enables concurrent operation of up to five sampling trains—e.g., one TSP/PM₁₀/PM_2.5 cascade setup plus four gas-phase lines—each with individually programmable flow control and timing logic.
• High-reliability dual-stage flow control: Combines a high-negative-pressure brushless diaphragm pump (≥6 kPa load at 100 L/min; >5,000 h MTBF at 80% rated load) with a precision corrosion-resistant electronic mass flow meter (±2% full-scale accuracy, humidity-tolerant calibration).
• Intelligent power management: Integrated rechargeable Li-ion battery supports ≥4 h continuous operation at 100 L/min; automatic data retention during power interruption; seamless resumption upon restoration.
• Ruggedized field enclosure: IP54-rated housing with anti-static, rainproof, dustproof, and impact-resistant construction—validated for deployment in high-humidity, snowy, dusty, or haze-prone environments.
• Human-centric interface: 4.3-inch capacitive color touchscreen with physical backup keys; real-time display of flow rate, elapsed time, pressure, temperature, battery status, and error diagnostics.

Sample Compatibility & Compliance

The ZR-3923 accommodates standard 47 mm and 90 mm diameter filters (quartz fiber, PTFE, PVC, cellulose ester) for particulate gravimetry and inert substrates (e.g., stainless steel sorbent tubes, glass wool-packed cartridges) for gaseous analytes. Its TSP/PM₁₀/PM_2.5 cyclone cut-points conform to HJ 93-2013 dimensional tolerances and flow-dependent aerodynamic performance criteria. All internal wetted surfaces are chemically inert (anodized aluminum, fluoropolymer-coated valves), preventing catalytic degradation or adsorption loss of reactive species (e.g., ozone, NO₂, formaldehyde). The instrument supports audit-ready data integrity via timestamped event logging and meets GLP-aligned traceability requirements per HJ 656-2013 and Q/0214 ZRB010-2017.

Software & Data Management

Onboard firmware records second-by-second flow, pressure, temperature, and runtime metadata to internal flash memory (≥100,000 records). Data export is supported via USB 2.0 (CSV format compatible with Excel, R, and EPA AQS validation tools). Optional GPRS module enables encrypted remote telemetry (MQTT/HTTP POST) for centralized network monitoring. Calibration logs, user-defined sampling protocols, and QC flags (e.g., low-flow alerts, filter overload warnings) are stored with cryptographic hash integrity. While not FDA 21 CFR Part 11-certified out-of-box, the system’s audit trail structure—immutable timestamps, operator ID tagging, and change history—facilitates adaptation to regulated QA/QC workflows under ISO/IEC 17025 or CNAS accreditation.

Applications

• Regulatory ambient air quality monitoring (AQMS) for national and municipal networks
• Source apportionment studies requiring co-located PM and VOC speciation
• Indoor air quality (IAQ) assessment in schools, hospitals, and industrial facilities
• Method validation and inter-laboratory comparison exercises per HJ 618 and HJ 656
• Field-based exposure assessment for epidemiological cohort studies
• Calibration verification of continuous PM monitors (e.g., beta attenuation, laser scattering)

FAQ

What particle size fractions can the ZR-3923 collect simultaneously?
It supports TSP, PM₁₀, and PM_2.5 collection using interchangeable aluminum cyclones compliant with HJ 93-2013 dimensional and performance specifications.
Does the instrument support EPA or ISO-compliant gas sampling methods?
Yes—it is mechanically and functionally compatible with EPA TO-17 (thermal desorption), TO-2 (multi-sorbent tubes), and ISO 16000-6 (VOC sampling), provided appropriate sorbents and post-sampling analytical validation are applied.
Is external calibration required for the built-in pressure and temperature sensors?
No—the unit employs factory-calibrated, maintenance-free piezoresistive pressure transducers and NTC thermistors with documented metrological traceability per JJG 943-2011 and JJG 956-2013.
Can sampling protocols be scheduled remotely?
With optional GPRS integration, users may push new schedules, trigger manual starts/stops, and retrieve status reports via secure web API or SMS command interface.
What is the maximum allowable backpressure for reliable 130 L/min operation?
The pump maintains ≥130 L/min within ±5% setpoint up to 5.2 kPa system resistance, verified per HJ/T 375-2007 static load testing protocol.