DFC-3BT Dust Sampler

Overview

The DFC-3BT Dust Sampler is a portable, microprocessor-controlled air sampling instrument engineered for quantitative collection of inhalable and respirable particulate matter (PM) in occupational health, environmental monitoring, and industrial hygiene applications. It operates on the principle of constant-flow volumetric sampling—drawing ambient air through a pre-weighed filter medium (e.g., PVC, PTFE, or mixed cellulose ester) at a user-selectable and precisely regulated flow rate. The device employs a brushless diaphragm vacuum pump coupled with real-time feedback control to maintain stable flow across varying filter loading and static pressure conditions. Its robust mechanical architecture and wide operating temperature range (−25°C to +45°C) ensure reliable field deployment in diverse climatic and industrial settings—from construction sites and mining operations to indoor air quality audits and regulatory compliance surveys.

Key Features

• Microcontroller-based flow regulation with digital timing interface for high reproducibility and low drift
• Integrated high-capacity nickel-cadmium (NiCd) rechargeable battery supporting continuous operation up to 8 hours at 20 L/min (typical)
• Dual-power compatibility: seamless switching between 10 V DC (internal battery or external adapter) and 220 V AC, 50 Hz mains supply
• Precise programmable timer with adjustable sampling duration from 1 to 959 minutes in 1-minute increments
• Acoustic alarm and automatic power cutoff upon timer completion or low-battery condition
• High-efficiency vacuum pump delivering ≥15,000 Pa negative pressure—sufficient for extended-duration sampling with high-resistance filters (e.g., 37-mm PVC at 2.5 µm cut-point cyclones)
• Compact, impact-resistant housing (200 × 160 × 140 mm) with ergonomic design for belt-mount or tripod use
• Low-noise operation (≤60 dB(A)) compliant with OSHA and ACGIH field measurement guidelines

Sample Compatibility & Compliance

The DFC-3BT is compatible with standard 25-mm and 37-mm diameter membrane filters, as well as conductive and non-conductive substrates used in gravimetric analysis per ISO 7708:1995 (inhalable dust), ISO/TS 8507:2021 (respirable dust), and NIOSH Method 0500/0600. It supports paired-sampling configurations when used with IOM inhalable samplers or GK2.69 cyclones. The instrument meets CE marking requirements for electromagnetic compatibility (EN 61326-1) and safety (EN 61010-1). While not intrinsically safe, it is suitable for non-hazardous area use per IEC 60079-0. Calibration traceability follows ISO/IEC 17025 principles when performed using primary-standard rotameters or electronic calibrators (e.g., Gilian Gilibrator-2 or Mesa Labs DryCal DC-Lite).

Software & Data Management

The DFC-3BT operates as a standalone hardware platform without embedded data logging or Bluetooth/Wi-Fi connectivity. All operational parameters—including start time, set flow rate, elapsed duration, and final stop confirmation—are displayed on a backlit LCD screen and retained in volatile memory during active sampling. For regulatory documentation, users are advised to record field metadata manually in accordance with OSHA Technical Manual (Section II, Chapter 2) or EU Directive 2004/37/EC Annexes. When integrated into GLP/GMP-aligned workflows, the device supports audit-ready paper-based logs that include operator ID, calibration date, filter ID, and environmental conditions—fully compatible with laboratory information management systems (LIMS) via post-sampling data entry.

Applications

• Workplace exposure assessment for total dust, silica, asbestos, metal fumes, and organic particulates
• Baseline ambient PM₁₀/PM_2.5 monitoring in urban, rural, and peri-industrial zones
• Verification of local exhaust ventilation (LEV) system performance per HSE HSG258
• Indoor air quality (IAQ) investigations in schools, hospitals, and office buildings
• Supporting ISO 16000-18 and ASTM D6330 compliance testing for airborne particulate emissions
• Field validation of optical particle counters (OPCs) and beta attenuation monitors (BAMs)

FAQ

What filter types are recommended for use with the DFC-3BT?

Standard 37-mm mixed cellulose ester (MCE), polyvinyl chloride (PVC), or polytetrafluoroethylene (PTFE) filters are recommended. Filter selection must align with analytical method requirements (e.g., NIOSH 7500 for silica requires PVC).

Is the DFC-3BT suitable for respirable dust sampling?

Yes—when paired with a certified respirable cyclone (e.g., GK2.69 or IOM with 4-mm inlet), the DFC-3BT maintains stable flow within the 2.2–2.5 L/min range required by ISO 7708 and EN 481.

Does the unit support ISO/IEC 17025-compliant calibration?

The instrument itself is not calibrated; however, its flow performance can be verified and adjusted using accredited secondary standards traceable to NIST or NMi, satisfying ISO/IEC 17025 clause 6.4.2 for equipment verification.

Can the DFC-3BT operate continuously for 24 hours?

At 10 L/min, battery life exceeds 12 hours. For uninterrupted 24-hour sampling, AC power mode is required—ensuring full timer functionality and thermal stability under prolonged operation.

What maintenance is required to ensure long-term accuracy?

Biannual inspection of pump diaphragm integrity, flow sensor cleanliness, and battery capacity retention is recommended. Full recalibration is advised after any pump replacement or exposure to condensation or corrosive vapors.