Access Sensor Technologies
@accesssensor.bsky.social
Sampling made simple. We make wearable and stationary particulate matter and gas samplers. Learn more at https://www.accsensors.com
We’ve released another firmware update for UPAS v2.1 and v2.1 PLUS. We encourage users to update to firmware rev206. Read this blog to learn more about the associated improvements, including expanded microSD card compatibility checks and Power Save mode bug fix.
www.accsensors.com/blog/upas-fi...
www.accsensors.com/blog/upas-fi...
www.accsensors.com
October 28, 2025 at 6:46 PM
We’ve released another firmware update for UPAS v2.1 and v2.1 PLUS. We encourage users to update to firmware rev206. Read this blog to learn more about the associated improvements, including expanded microSD card compatibility checks and Power Save mode bug fix.
www.accsensors.com/blog/upas-fi...
www.accsensors.com/blog/upas-fi...
Reposted by Access Sensor Technologies
Thank you to Jess Tryner at Access Sensor Technologies for giving a cool and engaging presentation at the American Association of Aerosol Research earlier this week! We are so excited to continue collaborating together on our new projects in indoor air pollution research.
October 17, 2025 at 1:00 PM
Thank you to Jess Tryner at Access Sensor Technologies for giving a cool and engaging presentation at the American Association of Aerosol Research earlier this week! We are so excited to continue collaborating together on our new projects in indoor air pollution research.
Reposted by Access Sensor Technologies
Closing out an inspiring week at ISEE/ISES 2025 in Atlanta! We are grateful for the chance to connect, share our research, and learn from such an impressive roster of conference attendees. Thanks to all who stopped by our posters. See you next year!
August 27, 2025 at 1:00 PM
Closing out an inspiring week at ISEE/ISES 2025 in Atlanta! We are grateful for the chance to connect, share our research, and learn from such an impressive roster of conference attendees. Thanks to all who stopped by our posters. See you next year!
Today at #ISESISEE2025, the following presentations are on studies that used our UPAS:
1. Poster P07-07
2. Poster P15-02
3. Flash Talk FT06-06 at 16:33 in Regency VII
1. Poster P07-07
2. Poster P15-02
3. Flash Talk FT06-06 at 16:33 in Regency VII
August 18, 2025 at 12:33 PM
Today at #ISESISEE2025, the following presentations are on studies that used our UPAS:
1. Poster P07-07
2. Poster P15-02
3. Flash Talk FT06-06 at 16:33 in Regency VII
1. Poster P07-07
2. Poster P15-02
3. Flash Talk FT06-06 at 16:33 in Regency VII
We’ll be at #ISESISEE2025 in Atlanta next week and hope to see you there!
August 11, 2025 at 12:00 PM
We’ll be at #ISESISEE2025 in Atlanta next week and hope to see you there!
Will my UPAS log files change substantially if I update to the new firmware (rev200)? Nope! The log file format will remain the same. Read any UPAS log file into R using our astr package. Install astr v2.3.0, which we just released along with firmware rev200: www.github.com/accsensors/a...
GitHub - accsensors/astr: astr package for R log file analysis
astr package for R log file analysis. Contribute to accsensors/astr development by creating an account on GitHub.
www.github.com
May 29, 2025 at 1:12 PM
Will my UPAS log files change substantially if I update to the new firmware (rev200)? Nope! The log file format will remain the same. Read any UPAS log file into R using our astr package. Install astr v2.3.0, which we just released along with firmware rev200: www.github.com/accsensors/a...
What’s new in the new UPAS firmware? The UPAS now gets UTC time from the mobile device used to program the sample. No more going outside to get a GPS signal if your UPAS loses track of the time (in most cases, at least)! Read our latest blog post to learn more: www.accsensors.com/blog/new-fir...
Introducing the new UPAS v2.1 and v2.1 PLUS firmware
A blog post describing new features included in a major Ultrasonic Personal Air Sampler (UPAS) firmware update released in 2025.
www.accsensors.com
May 28, 2025 at 10:52 AM
What’s new in the new UPAS firmware? The UPAS now gets UTC time from the mobile device used to program the sample. No more going outside to get a GPS signal if your UPAS loses track of the time (in most cases, at least)! Read our latest blog post to learn more: www.accsensors.com/blog/new-fir...
We’ve released a new UPAS v2.1 and v2.1 PLUS User Guide that describes operation with the new firmware (rev200+). Download it from our website! Still running an older firmware version (<= rev157)? Don’t worry. The user guide for that firmware is still up too!
www.accsensors.com/upasv2.1
www.accsensors.com/upasv2.1
UPAS v2.1
The UPAS v2.1 is quiet, wearable, easy-to-use particulate matter sampler that logs time-resolved location, light, motion, T/P/RH, and sample flow data.
www.accsensors.com
May 27, 2025 at 1:02 PM
We’ve released a new UPAS v2.1 and v2.1 PLUS User Guide that describes operation with the new firmware (rev200+). Download it from our website! Still running an older firmware version (<= rev157)? Don’t worry. The user guide for that firmware is still up too!
www.accsensors.com/upasv2.1
www.accsensors.com/upasv2.1
Can I update any UPAS to the new firmware? Any UPAS v2.1 or v2.1 PLUS can be upgraded to firmware rev 200. These devices have serial IDs that start with “PSP”. UPAS v2.0 cannot be upgraded to the new firmware. Which UPAS is which? See our Products page to learn more: www.accsensors.com/products
Access Sensor Technologies: Products
Learn more about our virtually-silent, portable, and easy-to-use air pollution samplers.
www.accsensors.com
May 23, 2025 at 1:41 PM
Can I update any UPAS to the new firmware? Any UPAS v2.1 or v2.1 PLUS can be upgraded to firmware rev 200. These devices have serial IDs that start with “PSP”. UPAS v2.0 cannot be upgraded to the new firmware. Which UPAS is which? See our Products page to learn more: www.accsensors.com/products
We’ve released a major firmware update for our UPAS v2.1 and v2.1 PLUS. This update makes sample setup easier and UPAS operation more reliable! Read this blog to learn more about what’s new and how to update your UPAS: www.accsensors.com/blog/new-fir...
#AirPollution #AirQuality #ParticulateMatter
#AirPollution #AirQuality #ParticulateMatter
Introducing the new UPAS v2.1 and v2.1 PLUS firmware
A blog post describing new features included in a major Ultrasonic Personal Air Sampler (UPAS) firmware update released in 2025.
www.accsensors.com
May 22, 2025 at 9:20 PM
We’ve released a major firmware update for our UPAS v2.1 and v2.1 PLUS. This update makes sample setup easier and UPAS operation more reliable! Read this blog to learn more about what’s new and how to update your UPAS: www.accsensors.com/blog/new-fir...
#AirPollution #AirQuality #ParticulateMatter
#AirPollution #AirQuality #ParticulateMatter
We’ll be exhibiting at the Air & Waste Management Association Air Quality Measurements Conference in Aurora, CO this week! Come by Booth 12 and say hello! Find out if our UPAS or Home Health Box can fulfill your air sampling needs! #AQMeasurements
April 21, 2025 at 1:44 PM
We’ll be exhibiting at the Air & Waste Management Association Air Quality Measurements Conference in Aurora, CO this week! Come by Booth 12 and say hello! Find out if our UPAS or Home Health Box can fulfill your air sampling needs! #AQMeasurements
We’re looking to hire 1-2 summer interns through the CSU Energy Institute’s Cogen Summer Internship program. Interns will work on R&D activities related to our wearable #airpollution samplers. $25/hour, 40 hr/week for 10 weeks. Apply here by March 2nd: energy.colostate.edu/energy-insti...
Energy Institute Cogen Summer Internship - Energy Institute
The 2022 Cogen Summer Interns and Fellows. This could be you! Energy Institute’s Cogen Summer Internship Summer 2025May-August The Energy Institute is partnering with local companies to create interns...
energy.colostate.edu
February 3, 2025 at 7:15 PM
We’re looking to hire 1-2 summer interns through the CSU Energy Institute’s Cogen Summer Internship program. Interns will work on R&D activities related to our wearable #airpollution samplers. $25/hour, 40 hr/week for 10 weeks. Apply here by March 2nd: energy.colostate.edu/energy-insti...
Published today! Hundreds of 24h personal & indoor PM2.5 & PM10 measurements collected at 2 LPM with UPAS compared to samples collected with PMIs + Apex2 pumps: Spearman correlation > 0.8, normalized mean difference < 16%. All samples collected in California’s Central Valley.
doi.org/10.1080/0278...
doi.org/10.1080/0278...
Application and validation of a wearable monitor for assessing time- and location-resolved exposures to particulate matter in California’s Central Valley
Reliable assessment of personal exposure to air pollution remains a challenge due to the limitations of monitoring technology. Recent technology developments, such as reductions in the size and cos...
doi.org
November 22, 2024 at 10:02 PM
Published today! Hundreds of 24h personal & indoor PM2.5 & PM10 measurements collected at 2 LPM with UPAS compared to samples collected with PMIs + Apex2 pumps: Spearman correlation > 0.8, normalized mean difference < 16%. All samples collected in California’s Central Valley.
doi.org/10.1080/0278...
doi.org/10.1080/0278...
Want to write one of these papers? Need some cool new portable instruments to collect the data? Just let us know! #airpollution #airquality
By way of introduction, my contribution from a few years back of 12 main types of scientific papers in environmental health #environment #publichealth
November 22, 2024 at 3:15 AM
Want to write one of these papers? Need some cool new portable instruments to collect the data? Just let us know! #airpollution #airquality
We just released a new version of our astr package for reading UPAS and HHB log files into R! What’s new? This version won’t throw an error if you try to read an empty sample log; it will just return a data frame with zero rows. I stall from GitHub! #airquality #Rstats github.com/accsensors/a...
GitHub - accsensors/astr: astr package for R log file analysis
astr package for R log file analysis. Contribute to accsensors/astr development by creating an account on GitHub.
github.com
November 22, 2024 at 1:31 AM
We just released a new version of our astr package for reading UPAS and HHB log files into R! What’s new? This version won’t throw an error if you try to read an empty sample log; it will just return a data frame with zero rows. I stall from GitHub! #airquality #Rstats github.com/accsensors/a...
We just posted an updated UPAS v2.1 and v2.1 PLUS User Guide. What’s new?
1) An improved explanation of what happens when you start a sample from the app
2) advice for preparing the internal Li-ion battery for shipping or long-term storage. Download from this page: www.accsensors.com/upasv2.1plus
1) An improved explanation of what happens when you start a sample from the app
2) advice for preparing the internal Li-ion battery for shipping or long-term storage. Download from this page: www.accsensors.com/upasv2.1plus
UPAS v2.1 PLUS
The UPAS v2.1 PLUS combines a quiet, wearable, easy-to-use particulate matter filter sampler with time-resolved location and pollution sensors.
www.accsensors.com
November 19, 2024 at 9:26 PM
We just posted an updated UPAS v2.1 and v2.1 PLUS User Guide. What’s new?
1) An improved explanation of what happens when you start a sample from the app
2) advice for preparing the internal Li-ion battery for shipping or long-term storage. Download from this page: www.accsensors.com/upasv2.1plus
1) An improved explanation of what happens when you start a sample from the app
2) advice for preparing the internal Li-ion battery for shipping or long-term storage. Download from this page: www.accsensors.com/upasv2.1plus
You can program the PM sensor in the UPAS v2.1 PLUS to operate on a duty cycle so the UPAS can run longer on a single battery charge. Looking for advice on selecting the best setting for your application? Read our new blog post! #airquality #airpollution www.accsensors.com/blog/duty-cy...
Choosing the best particulate matter sensor duty cycle for your measurement application
Guidance for UPAS v2.1 PLUS users on selecting the best time-resolved particulate matter sensor duty cycle for a specific air sampling application.
www.accsensors.com
November 18, 2024 at 5:00 PM
You can program the PM sensor in the UPAS v2.1 PLUS to operate on a duty cycle so the UPAS can run longer on a single battery charge. Looking for advice on selecting the best setting for your application? Read our new blog post! #airquality #airpollution www.accsensors.com/blog/duty-cy...
Hello, Bluesky! Want to hear about new publications featuring our products? See blog posts with advice for collecting air samples? Find out about firmware and software updates? Follow us!
November 13, 2024 at 10:28 PM
Hello, Bluesky! Want to hear about new publications featuring our products? See blog posts with advice for collecting air samples? Find out about firmware and software updates? Follow us!