Burkard HIRST-Type Outdoor Cyclonic Air Sampler

Overview

The Burkard HIRST-Type Outdoor Cyclonic Air Sampler is an engineered solution for continuous, unattended atmospheric bioaerosol monitoring in field and semi-field environments. Based on the proven HIRST principle—a directional, reverse-flow cyclonic separation mechanism—it draws ambient air at a calibrated volumetric flow rate of 16.5 L/min. Unlike filter-based samplers, this system employs inertial impaction within a precision-machined cyclone head to deposit viable and non-viable airborne particles—including fungal spores, pollen, bacterial cells, and submicron bioaerosols—directly into sterile 1.5 mL Eppendorf tubes. The absence of membranes or filters eliminates clogging, pressure decay, and particle re-entrainment, ensuring stable sampling efficiency over extended deployments (up to 999 hours programmable). Its design adheres to the physical principles of cyclonic separation under laminar-to-transitional airflow regimes, enabling reproducible collection of particles ≥1 µm with minimal shear-induced damage—critical for downstream immunoassay (e.g., ELISA), nucleic acid extraction (e.g., qPCR), and microscopy-based identification.

Key Features

• Cyclonic particle separation without filters: Eliminates pore blockage, flow decay, and sample loss during long-term operation.
• Eight-position rotating carousel: Accommodates eight standard 1.5 mL Eppendorf tubes for sequential, time-resolved sampling (e.g., diurnal or weather-triggered cycles).
• Integrated solar power architecture: Monocrystalline photovoltaic panel charges a sealed lead-acid or LiFePO₄ battery housed in a weatherproof control enclosure—enabling 24/7 autonomous operation even under low-UV conditions.
• Weather station interface: Optional RS-485 or 0–10 V analog input allows dynamic sampling initiation based on real-time wind speed, humidity, or temperature thresholds.
• Burkard-certified vacuum pump: Precision-engineered diaphragm pump mounted at base ensures stable 16.5 L/min airflow across ambient temperatures from –20 °C to +50 °C.
• IP65-rated aluminum and stainless-steel construction: Corrosion-resistant housing suitable for deployment in agricultural fields, greenhouses, urban rooftops, and biosafety perimeter zones.

Sample Compatibility & Compliance

The sampler collects intact, undried biological particulates directly into sterile polypropylene Eppendorf tubes—preserving antigenic epitopes and nucleic acid integrity for quantitative molecular analysis. Collected samples are compatible with ISO/IEC 17025-accredited ELISA protocols, ITS/LSU rRNA-targeted PCR assays, and scanning electron microscopy (SEM) preparation. The system meets mechanical design requirements referenced in EN 13098:2001 (Bioaerosol Sampling Devices) and supports data traceability aligned with FDA 21 CFR Part 11 when paired with validated timestamped logging software. It is routinely deployed in EU Plant Health Directive (2016/2031) surveillance programs and USDA APHIS early-warning networks for invasive fungal pathogens such as Puccinia striiformis and Fusarium graminearum.

Software & Data Management

The embedded microcontroller logs timestamped start/stop events, cumulative runtime, and battery voltage to internal non-volatile memory (10,000-cycle EEPROM). Data export is supported via USB-C or SD card (FAT32 formatted), generating CSV files compliant with LIMS ingestion standards. Optional Burkard SAMPLER-Link™ firmware enables remote configuration via GSM/GPRS or LoRaWAN modules—supporting audit trails, alarm notifications (e.g., low battery, motor stall), and scheduled firmware updates. All timestamps adhere to UTC+0 with NTP synchronization capability when connected to networked weather stations.

Applications

• Agricultural epidemiology: Real-time monitoring of airborne inoculum loads for predictive modeling of rust, smut, and powdery mildew outbreaks.
• Phytosanitary border control: Detection of regulated plant pathogens at ports, nurseries, and quarantine greenhouses.
• Indoor air quality (IAQ) assessment: Long-term bioaerosol profiling in hospitals, laboratories, and pharmaceutical cleanrooms (ISO Class 5–8).
• Climate–health linkage studies: Correlating spore concentration dynamics with meteorological variables across multi-season field trials.
• Biosecurity surveillance: Early warning detection of aerosolized Bacillus anthracis simulants or viral surrogates in open-air defense test ranges.

FAQ

Does the sampler require external AC power?
No. It operates autonomously using its integrated solar panel and rechargeable battery—designed for uninterrupted function in off-grid locations.
Can it collect liquid-phase samples?
Yes. While optimized for dry deposition into Eppendorf tubes, optional liquid-collection adapters (e.g., impinger inserts) allow direct suspension in buffer solutions for enhanced viability recovery.
Is calibration traceable to national standards?
Airflow calibration is performed at Burkard’s UK facility using NPL-traceable rotameters and certified mass flow meters; calibration certificates are supplied with each unit.
What maintenance intervals are recommended?
Biannual inspection of O-rings, cyclone head alignment, and pump diaphragm integrity is advised; no routine filter replacement is required.
How is data integrity ensured during extended deployments?
All logged parameters include hardware-generated CRC-16 checksums and are write-protected against accidental overwrite until manually exported.