TWA-300HP Programmable Low-Flow Air Sampler

Overview

The TWA-300HP Programmable Low-Flow Air Sampler is an engineered solution for occupational and environmental air monitoring applications requiring precise, low-volume gas-phase sampling over extended durations. Designed in accordance with ISO 16000-22, NIOSH Method 1501/1502, and OSHA ID-130 guidelines, this instrument utilizes a calibrated positive-displacement diaphragm pump to deliver stable, low-flow aspiration across a wide operational range (20–500 mL/min). Its core function is to support quantitative collection of airborne contaminants—including volatile organic compounds (VOCs), inorganic gases (e.g., SO₂, NOₓ, H₂S), and semi-volatile organics—onto solid sorbent media such as activated carbon tubes, silica gel cartridges, and Tenax TA beds. The device is explicitly validated for both personal (individual) and area (fixed-location) sampling configurations, enabling compliance with time-weighted average (TWA) and short-term exposure limit (STEL) assessment protocols mandated by national occupational health standards (e.g., GBZ 159–2004, ACGIH TLVs®, and EU Directive 2017/2398).

Key Features

• Programmable microprocessor-controlled sampling: Supports up to 8-hour TWA scheduling with automatic start/stop and real-time elapsed time display.
• High-stability flow control: Maintains ≤5% deviation over 12-hour continuous operation, verified per ISO 5725-2 repeatability criteria.
• Dual-power architecture: AC mains operation with integrated high-capacity Ni-MH rechargeable battery providing ≥12 hours of uninterrupted runtime at 100 mL/min.
• Robust anti-backflow protection system: Patented dual-stage barrier prevents liquid condensate or particulate ingress into the pump chamber, extending service life and ensuring consistent volumetric accuracy.
• Compact ergonomic design: Lightweight (≤0.5 kg) and palm-sized (100 × 50 × 110 mm) for unobtrusive personal sampling without compromising thermal management or vibration damping.
• Universal sorbent tube interface: Standardized Luer-lock and threaded adapters accommodate 6-mm and 9-mm OD glass and stainless-steel sampling tubes per ASTM D5466 and EN 1076 specifications.

Sample Compatibility & Compliance

The TWA-300HP is compatible with all widely accepted solid sorbent media used in regulatory air analysis, including but not limited to: coconut-shell activated carbon (ASTM D5228), silica gel (USP ), Carbopack™ series, and polyurethane foam (PUF) for semi-volatiles. It meets functional requirements for method validation under ISO/IEC 17025-accredited laboratories conducting analyses per EPA TO-17, NIOSH 5515, and EN 13725. The unit’s flow accuracy (±5% FS) and timer precision (≤±0.1%) satisfy data integrity thresholds for GLP-compliant exposure assessments. Its operating temperature range (−25 to +45 °C) ensures field reliability across diverse climatic conditions—from industrial cold storage facilities to tropical outdoor worksites.

Software & Data Management

While the TWA-300HP operates as a standalone hardware platform without embedded Bluetooth or cloud connectivity, it generates auditable physical records via its real-time LCD interface showing actual flow rate, elapsed time, and remaining battery capacity. All programmed parameters—including target flow, duration, and cycle count—are stored in non-volatile memory and retained after power cycling. For laboratory integration, raw sampling metadata (date/time stamp, flow setpoint, ambient temperature estimate) can be manually logged into LIMS systems compliant with 21 CFR Part 11 when paired with validated chain-of-custody documentation. Optional calibration certificate traceable to NIM (National Institute of Metrology, China) is available upon request.

Applications

• Occupational hygiene surveys for VOC exposure in paint manufacturing, printing, and adhesive application facilities.
• Indoor air quality (IAQ) assessment in schools, offices, and healthcare settings per ISO 16000-23.
• Compliance verification against MAC (Maximum Allowable Concentration) and TWA limits defined in GBZ 2.1–2019.
• Field validation of fume hood performance and local exhaust ventilation (LEV) efficiency.
• Baseline monitoring in remediation projects involving chlorinated solvents or benzene homologues.
• Research-grade sampling for atmospheric chemistry studies requiring low-flow, long-duration passive integration.

FAQ

What sorbent tubes are compatible with the TWA-300HP?
Standard 6-mm and 9-mm outer diameter glass or stainless-steel tubes filled with activated carbon, silica gel, Carbopack B/C, or Tenax TA are fully supported using included adapters.
Does the device support flow calibration verification in the field?
Yes — the unit features a dedicated calibration port compatible with primary standard rotameters or electronic bubble meters meeting ISO 4031 requirements.
Is the TWA-300HP certified for use in potentially explosive atmospheres?
No — it is not intrinsically safe or ATEX/IECEx certified; for hazardous locations, consult the manufacturer’s explosion-proof variant (TWA-300HP-EX) series.
Can the sampler operate unattended overnight?
Yes — with full battery charge and programmed 8-hour TWA cycle, it maintains stable flow without supervision and includes auto-shutdown upon completion.
How often should the pump filter be replaced?
Under typical indoor use, inspect and replace the hydrophobic PTFE inlet filter every 500 operating hours or after exposure to high-humidity or particulate-laden environments.