PM2.5 Sampler GR-1350 Type-2 by Guo Ruili Heng

Overview

The GR-1350 Type-2 PM2.5 Sampler is a precision-engineered ambient air particulate monitoring instrument designed for gravimetric and filter-based collection of inhalable fine particulate matter with an aerodynamic diameter ≤ 2.5 µm. It operates on the principle of inertial separation combined with size-selective cyclonic pre-separation and final capture on standardized 47-mm or 80-mm quartz fiber or Teflon-membrane filters. Compliant with ISO 7708:1995 (Air quality — Particle size fraction definitions for health-related sampling), EPA Reference Method PS-11 (for PM2.5), and Chinese national standard HJ 618–2011 (Ambient Air – Determination of PM10 and PM2.5 – Gravimetric Method), the sampler delivers high reproducibility in field-deployed environmental monitoring networks, regulatory compliance stations, and research-grade air quality assessment programs.

Key Features

• Robust IP54-rated enclosure ensuring dust resistance and protection against water splashes from any direction—enabling reliable outdoor operation under variable climatic conditions.
• Integrated dual-stage impactor/cyclone system calibrated to meet PM2.5 cut-point specifications (50% collection efficiency at 2.5 ± 0.2 µm aerodynamic diameter) per ISO 14644-1 and EN 13274-2.
• Microprocessor-controlled flow regulation with real-time volumetric flow monitoring (range: 16.7 L/min ± 2%); maintains constant sampling rate across ambient pressure and temperature fluctuations via integrated thermal mass flow sensor and PID-controlled vacuum pump.
• Automatic power-fail recovery with time-stamped event logging; retains all operational parameters and accumulated sampling duration upon restart.
• Modular filter holder compatible with standard 47-mm and 80-mm filter media—including quartz fiber (for OC/EC analysis), PTFE membrane (for ion chromatography), and nylon (for metal speciation)—with leak-tight silicone gasket sealing verified to < 0.5% leakage at 25 kPa differential pressure.

Sample Compatibility & Compliance

The GR-1350 Type-2 supports filter-based analytical workflows aligned with multiple international regulatory protocols. It is validated for use in methods requiring filter integrity verification (e.g., ASTM D6216-21 for PM2.5 filter handling), weight stability assessment (per US EPA Method IO-3.3), and post-sampling gravimetric analysis in temperature- and humidity-controlled balance rooms (ISO 17025-accredited laboratories). The unit’s mechanical design conforms to CE marking requirements for electromagnetic compatibility (EN 61326-1) and low-voltage safety (EN 61010-1). All wetted materials are chemically inert (316 stainless steel inlet nozzle, anodized aluminum housing, FDA-compliant elastomers), minimizing analyte adsorption or leaching during extended deployments.

Software & Data Management

Data acquisition is managed via embedded firmware supporting RS-232 and optional RS-485/Modbus RTU communication protocols. Raw data—including real-time flow rate, cumulative volume, ambient temperature and pressure, pump runtime, and error codes—is timestamped and stored internally for up to 30 days (circular buffer). Export is supported via USB-C interface in CSV format, compatible with laboratory information management systems (LIMS) and EPA-approved data validation software such as EQuIS and AQS. Audit trail functionality meets GLP and GMP documentation expectations, with immutable records of operator-initiated parameter changes, calibration events, and maintenance logs traceable to user ID and UTC timestamp.

Applications

• Long-term ambient air quality monitoring in urban, suburban, and rural environments per national air quality standards (e.g., China’s GB 3095–2012, EU Directive 2008/50/EC).
• Source apportionment studies requiring high-volume, time-integrated filter samples for subsequent XRF, ICP-MS, or GC-MS analysis.
• Validation and co-location testing of optical particle counters and beta attenuation monitors (BAMs) in QA/QC programs.
• Indoor air quality assessments in schools, hospitals, and occupational settings where PM2.5 exposure thresholds must be verified against WHO Air Quality Guidelines (AQG 2021).
• Field deployment in mobile monitoring platforms (e.g., vehicle-mounted or drone-suspended configurations) due to compact footprint (W×D×H: 320 × 300 × 510 mm) and 12 V DC / 24 V DC dual-power capability.

FAQ

What filter types are certified for use with the GR-1350 Type-2?
Quartz fiber (QFF), polytetrafluoroethylene (PTFE), and nylon membrane filters meeting ASTM D2974 or ISO 10473 specifications are fully compatible.
Does the sampler include NIST-traceable calibration documentation?
Yes—each unit ships with factory calibration certificate traceable to NIST SRM 1648a (Urban Particulate Matter) and includes documented flow calibration using a primary-standard dry gas meter (±0.5% uncertainty).
Can the GR-1350 Type-2 operate unattended for more than 24 hours?
Yes—it supports continuous operation for up to 30 days on stable AC power or 72 hours with external 12 V battery backup (optional accessory).
Is remote monitoring possible via cellular or Ethernet connectivity?
Standard configuration supports local data retrieval only; optional LTE module (GR-1350-REM) enables secure MQTT-based telemetry and firmware-over-the-air (FOTA) updates.
How is temperature and pressure compensation implemented during flow control?
Real-time ambient T&P inputs from integrated PT100 sensor and piezoresistive barometer feed into the flow controller’s density-compensation algorithm, maintaining volumetric accuracy within ±2% across −20 °C to +50 °C and 70–106 kPa.