ESA-3 Personal Dust Sampler by Yinhé Technology

Overview

The ESA-3 Personal Dust Sampler is an intrinsically portable, microprocessor-controlled sampling instrument engineered for quantitative collection of respirable and inhalable airborne particulate matter in occupational and environmental settings. It operates on the principle of constant-flow aspiration—using a precision diaphragm pump regulated by a digital feedback circuit—to maintain stable volumetric flow rates across variable backpressure conditions, such as those induced by loaded filter media or restrictive sampling heads. Designed for personal exposure monitoring, the ESA-3 conforms to internationally recognized aerosol size-selective criteria defined by the British Medical Research Council (BMRC) respirable dust curve, enabling accurate assessment of particles penetrating the alveolar region of the human respiratory tract. Its compact form factor, low mass (<500 g), and ergonomic wearability make it suitable for extended-shift deployment in industrial hygiene surveys, workplace air quality audits, and public health surveillance programs.

Key Features

• Microcontroller-based constant-flow regulation ensures consistent flow performance within ±5% stability across load fluctuations up to 40 mmHg.
• High-efficiency diaphragm pump fabricated with acid/alkali-resistant elastomeric valve plates and electronically stabilized motor drive—capable of sustaining ≥2.5 L/min at rated load and ≥25 kPa maximum vacuum pressure.
• Dual-mode power architecture: supports both AC-powered operation (via integrated 8 V DC regulated output) and DC-powered field use with optional rechargeable Ni-MH battery pack (typical runtime >8 hours per charge).
• Fixed 8-position mechanical timer with discrete ON/OFF toggle switches; selectable durations range from 5 to 480 minutes (5, 10, 15, 40, 60, 120, 240, and 480 min), calibrated to ≤±1% timing accuracy.
• Dual LED status indicators: red operational light (active sampling) and automatic voltage-drop warning (extinguishes at ≤6.0 ±0.2 V), protecting battery longevity and ensuring data integrity.
• AS/ABS engineering-grade polymer housing with anti-static, moisture-resistant, and dust-sealed surface treatment; available in four non-fading color options (black, gray, green, blue) for user identification and departmental coding.

Sample Compatibility & Compliance

The ESA-3 integrates seamlessly with standardized 25 mm diameter membrane filters (e.g., PVC, mixed cellulose ester, or polytetrafluoroethylene) and pairs exclusively with its proprietary BMRC-certified sampling head—co-developed under technical guidance from the National Institute of Occupational Health and Poison Control (NIOHPC), Chinese Center for Disease Control and Prevention. This preseparator meets the aerodynamic cutoff specifications outlined in GBZ/T 192.2–2007 (“Methods for Monitoring Hazardous Substances in Workplace Air”, p.390) and demonstrates high collection efficiency (>90%) for sub-10 µm aerosols—including combustion-derived soot, metal fumes, and organic smoke particulates. While not intrinsically certified for ATEX or IECEx zones, the unit may be deployed in non-explosive environments compliant with ISO 7203, OSHA 29 CFR 1910.1200, and EU Directive 2004/108/EC (EMC). All firmware logic and hardware design adhere to GLP-aligned documentation practices for traceable calibration and audit readiness.

Software & Data Management

The ESA-3 is a standalone analog-digital hybrid instrument with no embedded Bluetooth, Wi-Fi, or cloud connectivity. All operational parameters—including elapsed time, flow rate selection, and battery status—are monitored via front-panel LEDs and mechanical dials. For regulatory reporting, users manually record start/stop times and post-sampling gravimetric analysis results using the standard concentration formula: C (mg/m³) = (W₂ − W₁) / (Q × t), where W₂ and W₁ are post- and pre-sampling filter masses (mg), Q is actual flow rate (L/min), and t is total sampling duration (min). Calibration certificates, factory test reports, and GBZ/T 192.2–2007 alignment documentation are supplied with each unit. Optional NIST-traceable flow calibrator kits (e.g., DryCal DC-Lite) may be used for field verification in accordance with ISO 17025-accredited laboratory procedures.

Applications

• Occupational hygiene monitoring of respirable crystalline silica (RCS), coal dust, wood dust, and welding fume in mining, construction, and manufacturing sectors.
• Field validation of local exhaust ventilation (LEV) system performance per HSE HSG258 guidelines.
• Baseline ambient particulate mapping in community health studies near industrial corridors or traffic-dense urban zones.
• Compliance testing against national permissible exposure limits (PELs) defined in GBZ 2.1–2019 and WHO Air Quality Guidelines (AQG) for PM₁₀ and PM₂.₅ surrogates.
• Educational use in university-level industrial hygiene, environmental science, and occupational safety curricula.

FAQ

What filter types are compatible with the ESA-3?
Standard 25 mm circular membrane filters—including polycarbonate, mixed cellulose ester (MCE), and polyvinyl chloride (PVC)—are fully supported. Filter selection must align with analyte solubility and subsequent analytical method (e.g., XRD for silica, gravimetry for total dust).
Is the BMRC sampling head supplied with every unit?
Yes—two BMRC-compliant plastic sampling heads are included in the standard configuration. These are manufactured under technical supervision of NIOHPC and validated per GBZ/T 192.2–2007 Annex D.
Can the ESA-3 be used for 8-hour TWA sampling without interruption?
Affirmative. With a fully charged Ni-MH battery and flow set at 2 L/min, continuous operation exceeds 8 hours. Runtime scales inversely with flow rate and ambient temperature.
Does the device meet FDA 21 CFR Part 11 requirements?
No—the ESA-3 lacks electronic audit trails, user authentication, or digital data logging; therefore, it is not Part 11 compliant. It is intended for manual data capture in non-GxP environments.
What maintenance is required between sampling sessions?
After each use, inspect the inlet pathway for moisture or particulate buildup. If liquid ingress occurs, flush the pump chamber with distilled water followed by anhydrous ethanol. Do not immerse the main unit. Recharge the battery if voltage drops below 6.0 V.