TWA-300 Low-Flow Air Sampler
| Origin | Jiangsu, China |
|---|---|
| Manufacturer Type | Authorized Distributor |
| Origin Category | Domestic (China) |
| Model | TWA-300 |
| Pricing | Available Upon Request |
Overview
The TWA-300 Low-Flow Air Sampler is a portable, battery-operated sampling instrument engineered for time-weighted average (TWA) collection of airborne contaminants—including gases, vapors, aerosols, and respirable particulates—in occupational and ambient environments. It operates on the principle of controlled volumetric aspiration using a precision diaphragm pump, delivering stable low-flow rates essential for compliance with OSHA, NIOSH, and ISO 16000-series sampling protocols. Designed for field deployment in industrial hygiene surveys, indoor air quality assessments, and environmental monitoring campaigns, the TWA-300 supports both continuous and intermittent sampling modes. Its compact footprint (137 × 88 × 45 mm), sub-500 g mass (including batteries), and robust mechanical architecture make it suitable for personal exposure monitoring, area sampling, and mobile laboratory integration.
Key Features
- High-efficiency diaphragm pump with acid/alkali-resistant valve membranes, delivering ≥1.5 L/min at 40 mmHg backpressure and maintaining flow stability ≤±5% under variable load conditions
- Eight-step fixed-interval electronic timer (5 min to 8 hr), with manual override mode and timing accuracy ≤±1% — compliant with NIOSH Manual of Analytical Methods (NMAM) timing requirements
- Dual-power operation: rechargeable Ni-Cd battery pack (8 hr runtime) or six AA alkaline cells (4.5 hr typical); integrated low-voltage indicator (LED extinguishes at ≤6 V DC)
- Universal sampling interface accommodating glass impingers, charcoal tubes, silica gel cartridges, filter cassettes, and microbial impactor heads
- Integrated inlet filter assembly with hydrophobic foam and cellulose fiber media — provides reverse-flow protection and pre-filtration against dust, mist, and corrosive vapors
- Compact “charge-stabilize” dual-mode power adapter: delivers regulated 8 V DC during sampling; automatically terminates charging when battery reaches nominal voltage
Sample Compatibility & Compliance
The TWA-300 is validated for use with standard NIOSH/OSHA sorbent tubes (e.g., coconut shell charcoal, Tenax TA), liquid impingers (e.g., midget impingers for formaldehyde or SO₂), membrane filters (e.g., PVC, PTFE, polycarbonate for metals or endotoxin analysis), and bioaerosol collection substrates. Its adjustable flow range (20–500 mL/min) aligns with method-specific requirements for volatile organic compounds (VOCs), aldehydes, acid gases, and respirable dust fractions. The instrument meets ISO 9001 manufacturing controls and conforms to IEC 61000-4 electromagnetic compatibility standards. While not intrinsically safe, optional explosion-proof accessories are available for Class I, Division 2 environments per NEC Article 500.
Software & Data Management
The TWA-300 is a hardware-only sampling platform with no embedded firmware or digital connectivity. All operational parameters—including start/stop time, duration, and battery status—are manually recorded by the user in accordance with GLP documentation practices. Field logs must be maintained per ISO/IEC 17025 and OSHA 1910.1200 recordkeeping requirements. For audit readiness, users are advised to pair the sampler with calibrated secondary flow meters (e.g., dry gas meters or electronic bubble meters) and maintain calibration certificates traceable to NIST standards. No software installation or data export functionality is provided.
Applications
- Occupational exposure assessment per OSHA Permissible Exposure Limits (PELs) and ACGIH Threshold Limit Values (TLVs®)
- Indoor air quality investigations targeting VOCs, carbon monoxide, nitrogen dioxide, and ozone precursors
- Environmental baseline studies in proximity to industrial facilities, landfills, or transportation corridors
- Respiratory protection program validation through personal breathing zone sampling
- Method validation and inter-laboratory comparison exercises under ISO 5725 guidelines
- Field deployment in epidemiological cohort studies requiring high-sample-number logistics
FAQ
What flow rate ranges does the TWA-300 support, and how is accuracy verified?
The instrument delivers 20–500 mL/min with a certified flowmeter accuracy of Class 2.5 per GB/T 1226–2017 (equivalent to ISO 5167). Users must verify actual flow using a primary standard (e.g., soap bubble meter) before each sampling event.
Can the TWA-300 be used for microbial air sampling?
Yes — when coupled with certified impactor heads (e.g., Andersen or SAS-type samplers) or membrane filtration assemblies meeting ISO 14698-1 biological contamination control requirements.
Is the device compatible with international calibration standards?
All performance specifications reference internationally harmonized metrological frameworks, including ISO 8573-1 for compressed air purity and ASTM D1357 for air sampling methodology. Calibration traceability requires third-party verification against NIST-traceable references.
Does the TWA-300 meet FDA 21 CFR Part 11 requirements?
No — as a standalone analog sampling device without electronic data capture, audit trail, or user authentication, it falls outside the scope of Part 11. Digital data integrity must be ensured via external lab information management systems (LIMS).
What maintenance intervals are recommended for the diaphragm pump and inlet filter?
Pump membranes should be inspected every 200 operating hours; inlet filter media must be replaced after each sampling event involving humid, acidic, or particulate-laden air — or at minimum every 10 field deployments.
