Derenda PNS-90 Integrated Medium-Flow Automated Filter-Changing Particulate Sampling System
| Brand | Derenda |
|---|---|
| Origin | Germany |
| Model | PNS-90 |
| Flow Range | 80–120 L/min (adjustable) |
| Rated Flow | 100 L/min (6 m³/h) |
| Vacuum Pressure | >800 hPa |
| Flow Stability | ≤±2.0% deviation over 24 h |
| Operating Lifetime at Max Flow & Backpressure | >50,000 h |
| Maximum Continuous Run Time per Cycle | 1 min–999 h |
| Filter Diameter | 90 mm |
| Dimensions | 590 × 415 × 1100 mm |
| Weight | 65 kg |
| Power Supply | 220 V ±10%, 50 Hz |
| Power Consumption | 470 VA (standby) / 570 VA (operational) |
| Max. Power | 600 VA |
| Data Storage Capacity | >1,000,000 records (1-min resolution, configurable) |
| Operating Temperature | −30 °C to +50 °C |
| Operating Humidity | 0–100 %RH |
| Ingress Protection | IP55 |
| Cooling Module | Peltier-based filter storage unit (≤20 °C) |
| Positioning | Dual-mode BeiDou/GPS |
| Compliant Standards | HJ 618–2011, HJ 93–2013, JJG 943–2011 |
Overview
The Derenda PNS-90 Integrated Medium-Flow Automated Filter-Changing Particulate Sampling System is an engineered solution for regulatory-grade ambient aerosol monitoring. Designed in accordance with Chinese national standards HJ 618–2011, HJ 93–2013, and JJG 943–2011, the system employs gravimetric sampling principles to collect total suspended particulates (TSP), PM10, and PM2.5 on 90 mm diameter filters. Its core architecture integrates a high-efficiency brushless vacuum blower capable of sustaining stable flow across variable backpressures—critical for long-term deployment under real-world atmospheric conditions including high-humidity or heavy haze environments. The system operates within a certified flow range of 80–120 L/min, with nominal operation at 100 L/min (6 m³/h), maintaining ≤±2.0% flow deviation over 24-hour periods—a performance benchmark aligned with ISO 12103-1 and US EPA Reference Method requirements for medium-flow samplers.
Key Features
- Precision-engineered mechanical filter exchange mechanism enabling fully automated, synchronized front-and-back filter replacement—validated for >300,000 uninterrupted cycles (Patent No. CN2015110108375).
- Dual-compartment filter magazine design: independent storage for blank and loaded filters, allowing hot-swap capability without interrupting active sampling.
- Integrated Peltier cooling module maintains filter storage temperature ≤20 °C—minimizing volatilization loss of semi-volatile organic compounds (SVOCs), elemental carbon, and water-soluble ions during post-sampling holding.
- Embedded RFID reader pre-installed in filter holders supports optional smart filter identification; enables automatic logging of filter ID, batch number, pre- and post-weighing mass, and sampling metadata.
- Dual GNSS positioning (BeiDou + GPS) ensures geotagging accuracy <5 m RMS in urban and remote deployment scenarios, supporting traceable QA/QC workflows.
- Onboard environmental sensors continuously record ambient temperature, relative humidity, and barometric pressure—data visualized as time-series curves via local display and exported in CSV/NetCDF formats.
- Robust IP55-rated enclosure permits outdoor installation in unsheltered locations, with operational reliability verified from −30 °C to +50 °C and 0–100% RH.
Sample Compatibility & Compliance
The PNS-90 accommodates standard 90 mm quartz fiber, Teflon®, cellulose ester, and PVC membrane filters used in regulatory weight-based analysis. Its 18-position filter carousel supports extended unattended operation—up to ~1,800 hours per full sequence (99 h 59 min per filter). All airflow paths are constructed from electropolished stainless steel and fluoropolymer-lined components to prevent adsorption artifacts. The system meets traceability requirements for GLP-compliant laboratories: audit logs record operator actions, calibration events, flow validation timestamps, and environmental parameter drift. Data export supports CSV, XML, and direct ingestion into LIMS platforms compliant with ISO/IEC 17025 and FDA 21 CFR Part 11 when paired with optional secure wireless transmission modules (3G/4G LTE).
Software & Data Management
The embedded Linux-based controller provides local touchscreen interface for real-time status monitoring, manual override, and diagnostic self-tests—including automated leak-check routines per HJ 93–2013 Annex B. Remote configuration, start/stop commands, and firmware updates are supported via encrypted HTTPS API or optional MQTT broker integration. All sensor and operational data—including flow rate, pressure differential, motor current, temperature/humidity profiles, and GPS coordinates—are timestamped with microsecond precision and stored redundantly in non-volatile memory (>1 million records). Cloud synchronization is enabled through TLS-secured 3G/4G modules, allowing centralized fleet management across regional air quality networks.
Applications
The PNS-90 serves as a primary reference sampler in national ambient air monitoring networks (NAAMN), municipal environmental protection bureaus, and third-party testing laboratories conducting routine compliance monitoring per China’s Ambient Air Quality Standards (GB 3095–2012). It is routinely deployed for source apportionment studies requiring speciated analysis—including ion chromatography (IC) for anions/cations, ICP-MS for trace metals, thermal-optical reflectance (TOR) for OC/EC, and GC-MS for organic molecular markers. Its low-temperature storage and high flow stability make it especially suitable for winter campaigns targeting nitrate aerosol formation and secondary organic aerosol (SOA) volatility characterization.
FAQ
Does the PNS-90 support multi-filter sequential sampling for size-fractionated analysis?
Yes—the system supports programmable cascade configurations using optional impactor stages upstream of the main filter holder; however, the standard configuration is optimized for single-stage gravimetric collection of TSP, PM10, or PM2.5 with inlet-specific cyclones or virtual impactors.
Is field calibration traceable to national metrology institutes?
All flow meters are factory-calibrated against NIM-traceable primary standards; calibration certificates include uncertainty budgets per ISO/IEC 17025. On-site verification kits (e.g., bubble meters, electronic calibrators) are available as accessories.
Can the system operate autonomously for more than 30 days without maintenance?
Yes—under typical ambient conditions and with scheduled filter changes every 99 h 59 min, the PNS-90 achieves >75 days of continuous operation per full 18-filter sequence, assuming no extreme dust loading or condensation events.
What cybersecurity protocols are implemented for remote data transmission?
Data transmission uses TLS 1.2+ encryption; device authentication employs X.509 certificates; all API endpoints enforce role-based access control (RBAC) and session timeouts. Optional FIPS 140-2 validated cryptographic modules are available upon request.
Is the Peltier cooling unit designed for energy-efficient operation in off-grid deployments?
Yes—the thermoelectric module operates at variable duty cycle based on ambient temperature and internal thermal load, consuming <15 W average power during storage mode—compatible with solar-battery hybrid power systems rated ≥600 VA peak output.
