AST - Model UPAS v2 -Ultrasonic Personal Air Sampler

Access Sensor Technologies’ Ultrasonic Personal Air Sampler (UPAS) is a compact filter sampler built around ultrasonic pumping technology. The UPAS is smaller, lighter, quieter, more affordable, easier to use, and more robust than conventional air sampling equipment.

Minimal ergonomic burden: The UPAS is silent, small, and light enough to be worn directly in the subject’s breathing zone. The interchangeable size-selective sample inlets and filter cartridges integrate directly with the pumping mechanism, so there’s no need for cumbersome tubing or tape!

Sampling made simple: It’s easy to set up the UPAS and download sample data to your mobile device using our Android or iOS application.
Reliable data: An active sample flow control system maintains the target volumetric flow rate even as environmental conditions change and the pressure drop across the sample filter increases. The UPAS automatically logs a comprehensive set of operational data to facilitate robust sample quality assurance.

• Integrated size-selective PM inlets
• Wireless setup via mobile application
• Active, accurate sample flow control
• Small and quiet; minimal ergonomic burden
• Comprehensive, time-resolved data logging
• GPS tracking
• Long battery endurance for extended sampling

• Exterior size: 128 mm × 70 mm × 23 mm
• Weight: 230 g (with PM_2.5 1 L min^-1 inlet)
• Noise:
• Flow rate range: 1 to 2 L min^-1 ± 4% (actively-controlled)
• Size-selective inlets (per relevant EPA, ACGIH, and ISO criteria)
• • PM_2.5, 1 L min^-1
  • PM_2.5, 2 L min^-1
  • Respirable, 2 L min^-1
  • PM₁₀ / Thoracic, 2 L min^-1
• Filter size: 37 mm (quick-change filter cartridge)
• Battery type: Li-ion, 24 W-h
• Battery endurance: >35 h when sampling PM_2.5 onto a PTFE filter at 1 L min^-1 , extendable via duty cycle sampling or external battery/power connection
• On-board sensors monitor:
• • Sample flow rate
  • Temperature/pressure/relative humidity
  • GPS location of UPAS
  • Differential pressure across the sample filter

These specifications depend on the filter used. Values reported here were determined using a 3 µm pore size PTFE filter from Measurement Technology Laboratories, LLC (PT37P-PF03).

The UPAS has been laboratory- and field-tested alongside gold standards like the Harvard Impactor and the Mesa Labs/BGI Triplex Cyclone.

Performance of the UPAS and a Personal Environmental Monitor (PEM + XR5000 pump) relative to an EPA Federal Reference Method (FRM) sampler for PM_2.5 mass.