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AST - Model UPAS v2+ -Compact Ultrasonic Personal Air Sampler
Our flagship wearable sampler. Collect filter-based air samples on to 37 mm filter media along with extensive sensor data to inform you on motion, compliance, environmental factors, particulate matter, carbon dioxide and tVOC and NOx. Access Sensor Technologies’ UPAS is a compact, filter sampler built around ultrasonic pumping technology. The UPAS is smaller, lighter, quieter, more affordable, and easier to use than conventional air sampling equipment.
The UPAS v2+ adds time-resolved PM, CO2, light, and motion (acceleration) sensing to our base model UPAS v2. These new sensors provide data useful for evaluating spatial -temporal aspects of exposure. On-device pairing of the optical PM sensor and integrated filter sampler allows the user to normalize the PM sensor data by the “gold standard” filter derived exposure metric.
The UPAS is silent 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 pump, so no cumbersome tubing is needed!
Filter sampling
The UPAS has been laboratory- and field-tested alongside gold standards like the Harvard Impactor and the Mesa Labs/BGI Triplex Cyclone. Right: Performance of the UPAS and a Personal Environmental Monitor (PEM + XR5000 pump) relative to an EPA Federal Reference Method (FRM) sampler for PM2.5 mass.
CO2 sensing
Before integrating the Sensirion SCD41 photoacoustic CO2 sensor into the UPAS v2+, we tested it alongside a research-grade NDIR CO2 monitor in a home with a gas-fueled cooking stove.
Right: CO2 concentrations measured in a home kitchen over one week using a calibrated LI-COR LI-820 NDIR CO2 monitor (solid black line) and two Sensirion SCD41 CO2 sensors (dashed blue and red lines).
Particulate matter sensing
We included the Sensirion SPS30 sensor in the UPAS v2+ because (a) its small size is compatible with our goal of minimizing the ergonomic burden of the UPAS, (b) we measured a small relative standard deviation between replicate units, and (c) the sensor includes features to prevent contamination in the types of highly-polluted environments where we know many of our customers collect data.
Left: 15-minute average PM2.5 concentrations measured in a home kitchen over 48 h using a tapered element oscillating microbalance (TEOM) and five Sensirion SPS30 sensors. The blue line and shaded area indicate the mean and range of concentrations measured by the five sensors.
- Integrated size-selective PM inlets
- Wireless setup via mobile application
- Active, accurate sample flow control
- Small and quiet; minimal ergonomic burden
- Comprehensive, high-resolution data logging
- GPS tracking
- Long battery endurance
- Exterior size: 128 mm × 70 mm × 36 mm
- Weight: 265 g (with PM2.5 1 L min-1 inlet)
- Noise:
- Filter sample flow rate range: 1 to 2 L min-1 ± 4% (active, automatic control)
- Size-selective inlets: PM2.5 (1 L min-1 and 2 L min-1), Respirable (2 L min-1),and PM10 / Thoracic (2 L min-1), per relevant EPA, ACGIH, and ISO criteria.
- Filter size: 37 mm (quick-change filter cartridge)
- Battery type: Li-ion, 24 W-h
- Battery endurance: >24 h when sampling PM2.5 onto a PTFE filter at 1 L min-1 with all sensors on; extendable via sampler and sensor duty cycling or external battery/power
- On-board sensors monitor:
- Fine particulate matter mass concentration (Sensirion SPS30)
- CO2 concentration (Sensrion SCD41)
- VOCs and NOx (Sensirion SGP41)
- Light (Lux, IR, UV, UVindex)
- Motion/acceleration (linear and angular, 6 DOF)
- Temperature/pressure/relative humidity
- GPS location of UPAS (can be deactivated)
- Sample flow rate
- Differential pressure across the sample filter
- These specifications are dependent on the filter used. Values reported here were determined using a 3 µm pore size PTFE filter from Measurement Technology Laboratories, LLC (PT37P-PF03).
- Keeping your hardware running can be one of the hardest parts of your work. Our tools:
- Save you time during setup, take down, and subject fitment.
- Run silently without pulsation to reduce subject complaints.
- Are `Full Stack` with inlet + filter cartridge + pump in one device.
- Are energy efficient to get you top performance and run times.
- Fully programmable to get the run you want with full accountability.
Take the next step to making our tools part of your best practice.
At Access Sensor Technologies we know you are serious about making a difference in the world, whether it’s an ambitious international project or working just around the corner. But what happens when your hardware becomes the hardest part of your work? Your equipment ends up limiting you. You fail to deploy at scale. Or you may simply not be getting enough data out of your hardware to create impact. The problem isn’t you! It’s that most hardware is built off an old approach to sampling. That’s why Access Sensor Technologies exists. We create tools to help you achieve more. More samples, more data, more impact. Start a new approach today. Contact us to learn about the thousands of ways our tools have helped people like you to conquer difficult sampling projects. Request a free loan of our equipment so you can experience our tools first hand. Speak with one us to define your equipment needs and get you a quotation. Remember, the hardware doesn’t have to be the hard part. We’re here to help you achieve more and make sampling the easy part.
