Digitel DPA96 Low-Flow Aerosol Sampler

Overview

The Digitel DPA96 Low-Flow Aerosol Sampler is an engineered solution for gravimetric and chemical analysis of atmospheric particulate matter in compliance with European and international ambient air quality monitoring standards. Designed and manufactured in Switzerland, the DPA96 employs a constant-flow, low-volume sampling principle based on calibrated volumetric displacement and real-time pressure/temperature compensation. Its core architecture integrates the Enviro-Drive™ flow regulation system—a closed-loop, feedback-controlled mechanism that maintains stable aspiration across variable environmental conditions, ensuring metrological traceability to ISO 5725 and EN 12341 reference methodologies. Unlike high-volume samplers, the DPA96 operates at reduced flow rates (5–50 L/min), minimizing filter loading artifacts and enabling extended sampling durations (up to 14 days at 2.3 m³/h) while preserving particle morphology and chemical integrity—critical for subsequent ion chromatography, ICP-MS, or organic speciation workflows.

Key Features

• Precision flow control via Enviro-Drive™ regulator: achieves ±1% volumetric accuracy at nominal 2.3 m³/h, with automatic correction for barometric pressure, ambient temperature, and inlet resistance.
• EN 12341-certified size-selective inlets: interchangeable PM₁₀, PM₂.₅, and PM₁ impactor/cyclone heads, each validated per CEN/TS 14907 and ISO 25597 protocols.
• Dual-environment enclosure options: IP50-rated stainless-steel housing for laboratory-grade stability; IP54-rated weather-resistant variant with integrated desiccant chamber and thermal buffer for unattended field deployment.
• Modular valve architecture: supports either the DIGITEL 16-way unidirectional valve for sequential multi-filter sampling or the 8-port solenoid valve for automated parallel channel allocation—both programmable via internal scheduler.
• Embedded touchscreen interface: 7-inch resistive LCD with intuitive menu navigation, real-time flow/pressure diagnostics, and event logging (start/stop time, filter ID, fault codes).
• Standardized digital connectivity: native RS-232 serial port and 10/100BASE-T Ethernet interface compliant with MODBUS RTU/TCP and ASCII command sets for integration into SCADA, EMS, or central data acquisition systems.

Sample Compatibility & Compliance

The DPA96 accommodates standard 47 mm and 37 mm diameter filters (quartz fiber, Teflon®, cellulose ester, PVC) and supports custom filter cassettes up to 50 mm. All inlet configurations adhere strictly to EN 12341:2014+A1:2022 requirements for ambient PM measurement, including aerodynamic cut-point verification, wind tunnel validation, and laboratory intercomparison performance criteria. The system meets the hardware prerequisites for EU Air Quality Directive (2008/50/EC) reference method equivalency when paired with certified inlets and traceable calibration procedures. It also satisfies US EPA Guidance for Equivalent Methods (40 CFR Part 53) for low-flow PM₂.₅ samplers when operated within specified flow tolerances and environmental envelopes.

Software & Data Management

Digitel’s proprietary DPA-Suite software provides local configuration, remote firmware updates, and secure data export in CSV, XML, and NetCDF formats. All operational parameters—including flow setpoint, valve sequence, sampling duration, and environmental sensor readings—are stored with UTC timestamps and checksummed for audit integrity. The system supports optional 21 CFR Part 11-compliant user access control (role-based login), electronic signatures, and immutable audit trails—enabling full GLP/GMP alignment in regulated environmental laboratories. Data synchronization via FTPS or MQTT ensures interoperability with cloud-based platforms such as EEA AirBase, national AQMN databases, and ISO/IEC 17025-accredited QA/QC reporting frameworks.

Applications

• Long-term ambient PM monitoring networks requiring high temporal resolution and low maintenance intervals.
• Source apportionment studies where chemical speciation demands minimal filter overload and preserved volatile organic compound (VOC) retention.
• Indoor air quality assessments in sensitive environments (e.g., cleanrooms, hospitals, museums) where low-noise, low-vibration operation is essential.
• Calibration and validation of optical particle counters (OPCs) and beta attenuation monitors (BAMs) using gravimetric reference samples.
• Mobile monitoring deployments aboard research vessels, UAV-mounted payloads, or vehicle-integrated stations leveraging its compact footprint (W×D×H: 320 × 420 × 510 mm) and 12–24 VDC power input.

FAQ

Is the DPA96 suitable for regulatory compliance reporting under EU or US air quality directives?
Yes—the DPA96, when equipped with EN 12341-certified inlets and operated per manufacturer-specified calibration and maintenance schedules, fulfills the technical requirements for reference or equivalent methods under Directive 2008/50/EC and 40 CFR Part 53.
Can the DPA96 operate unattended for more than one week?
Yes—under typical ambient conditions and at 2.3 m³/h flow rate, the unit supports continuous sampling for up to 14 days using standard 47 mm filters, with built-in low-flow alarm and battery-backed real-time clock.
Does Digitel provide calibration certificates traceable to national metrology institutes?
Yes—all factory calibrations are performed against NIST-traceable primary standards, and certificates include uncertainty budgets aligned with ISO/IEC 17025 requirements.
What filter types are validated for use with the DPA96?
Quartz fiber (Pallflex® EFA, Whatman QMA), PTFE membrane (Gelman Supor®), and polycarbonate track-etch (Nuclepore®) filters have been verified for compatibility with all inlet configurations and flow regimes.
How is data security handled during remote transmission?
All Ethernet communications support TLS 1.2 encryption, configurable firewall rules, and certificate-based authentication to prevent unauthorized access or data tampering.