Junray ZR-5102 Filter Membrane (Filter Cartridge) Conditioning and Weighing System

Overview

The Junray ZR-5102 Filter Membrane (Filter Cartridge) Conditioning and Weighing System is a purpose-built environmental conditioning platform engineered for gravimetric analysis of airborne particulate matter (PM) in accordance with standardized weight-based monitoring protocols. It integrates a high-precision analytical balance within a rigorously controlled temperature- and humidity-stabilized chamber, enabling standardized equilibration of filter media—such as quartz fiber, polytetrafluoroethylene (PTFE), or cellulose ester membranes and cylindrical filter cartridges—prior to final mass determination. The system operates on the principle of controlled atmospheric conditioning: samples are held under fixed thermohygrometric conditions (typically 20 ± 1 °C and 40 ± 5 % RH, per HJ 656–2013 and ISO 12103-1) for a minimum of 24 hours to eliminate hygroscopic drift and thermal expansion artifacts. This eliminates measurement uncertainty arising from ambient laboratory fluctuations—particularly critical when quantifying low-mass PM deposits (e.g., PM_2.5, PM₁₀) where microgram-level accuracy is mandatory.

Key Features

• Integrated dual-zone architecture: independent climate-controlled chamber and mechanically isolated balance compartment, minimizing vibration transmission from refrigeration compressors;
• 7-inch capacitive touchscreen controller with programmable PID algorithms, auto-tuning capability, and real-time graphical display of setpoint vs. actual temperature/humidity;
• Dual-safety thermal protection system: includes dry-run safeguards for humidifier heating elements and evaporator heaters, overcurrent and high-pressure cutouts for the sealed refrigeration circuit, and level-sensing water deficiency alarms;
• Optimized airflow design featuring rear-mounted centrifugal fans and directional ducting to ensure ≤±0.3 °C and ≤±2 % RH spatial uniformity across the entire working volume (≥95 L internal capacity);
• Ergonomic front access: double-glass observation window with two integrated stainless-steel glove ports (DN100), enabling contamination-free manual handling of filters without chamber opening;
• Corrosion-resistant construction: 304 stainless-steel inner chamber, electrostatically coated cold-rolled steel exterior, and high-density mineral wool insulation (≥80 mm thickness) for thermal stability and energy efficiency.

Sample Compatibility & Compliance

The ZR-5102 accommodates standard EPA/ISO-compliant filter formats—including 47 mm and 90 mm circular membranes, 110 mm × 140 mm rectangular filters, and cylindrical filter cartridges up to 150 mm in height and 50 mm in diameter—without requiring fixture modification. Its environmental profile satisfies the stringent preconditioning requirements of HJ 656–2013 (“Technical Specification for Manual Monitoring Methods of Ambient Air Particulate Matter by Gravimetric Analysis”), and aligns with supplementary international references including ISO 12103-1 (road dust standards), EN 12341 (ambient PM₁₀ measurement), and US EPA Method IO-3.1. All operational parameters—including dwell time, setpoint stability duration, and post-conditioning weighing windows—are fully traceable and auditable, supporting GLP-compliant workflows and readiness for regulatory inspection.

Software & Data Management

While the ZR-5102 operates via embedded firmware rather than PC-hosted software, its controller logs timestamped environmental data (temperature, relative humidity, elapsed conditioning time) at 1-minute intervals to internal non-volatile memory (≥30 days retention). Data export is supported via USB 2.0 interface in CSV format for integration into LIMS or QA/QC reporting systems. The system supports user-defined pass/fail thresholds for environmental stability verification prior to weighing initiation—ensuring only validated equilibration cycles contribute to certified mass records. Audit trails include operator ID entry, session start/stop timestamps, and system fault event logging—all structured to meet basic FDA 21 CFR Part 11 expectations for electronic record integrity where local validation protocols permit.

Applications

• Pre- and post-sampling gravimetric analysis of ambient air filters in national and municipal air quality monitoring networks;
• Calibration and validation of beta attenuation monitors (BAM), tapered element oscillating microbalances (TEOM), and other continuous PM analyzers;
• Method development and interlaboratory comparison studies under ISO/IEC 17043 proficiency testing frameworks;
• Research-grade particulate matter characterization in atmospheric science, combustion emissions testing, and occupational hygiene assessments;
• Quality control of filter media manufacturing, including batch consistency evaluation of blank mass, loading capacity, and hydrophobicity stability.

FAQ

What is the recommended equilibration duration before weighing?
Per HJ 656–2013 and ISO 12103-1, a minimum of 24 hours is required; the ZR-5102 controller allows programmable dwell times up to 99 hours.
Can the system accommodate custom-sized filter holders?
Yes—internal chamber dimensions (W×D×H: 600 × 550 × 500 mm) support user-fabricated stainless-steel or PTFE fixtures compatible with non-standard sampling configurations.
Is remote monitoring or Ethernet connectivity available?
Standard configuration includes only local touchscreen control and USB data export; optional RS-485 Modbus RTU interface can be integrated for SCADA-level building management system (BMS) linkage.
How is balance vibration isolation achieved?
The refrigeration unit resides in a separate external cabinet, and internal airflow is decoupled from the balance mounting plate via passive anti-vibration mounts and laminar flow channeling.
Does the system comply with ISO/IEC 17025 calibration requirements?
The ZR-5102 itself is not a measuring instrument but an environmental conditioning device; its performance verification (temperature/humidity uniformity, stability, recovery time) must be performed per ISO/IEC 17025 Annex A.3 using accredited third-party probes.