Access Sensor Technologies has sold three different versions of our Ultrasonic Personal Air Sampler ...
Step 1: Fill out the Support Request Form If you think you need to send your UPAS to us for service—...
"How do people wear the UPAS?" Below, we discuss factors you should consider when figuring out the b...
When planning a particulate matter (PM) sampling campaign, you might ask yourself the following ques...
Unfortunately, not every particulate matter (PM) sample that you attempt to collect will be successf...
What is the limit of detection? The concept of "limit of detection" (LOD) applies when taking any me...
We’ve just wrapped a multi-year effort to build, test, and validate a new way of taking indoor air m...
In May 2025, we released a major update to our UPAS v2.1 and v2.1 PLUS firmware, named “rev200.” Sin...
What is the pre-cyclone impactor? The pre-cyclone impactor is a device that can be installed in our ...
What does it mean for a sample to be "overloaded"? When a sample is said to be "overloaded," that ge...
Access Sensor Technologies has improved our UPAS v2.1 and UPAS v2.1 PLUS firmware to make UPAS opera...
Access Sensor Technologies has improved the design of our PM2.5 1 LPM cyclone inlet to achieve a pen...
You might have noticed that you can use the AST UPAS mobile app to program the time-resolved particu...
How do outdoor particulate matter concentrations measured using Ultrasonic Personal Air Samplers (UP...
Do you want to design a project in which study participants initiate and collect multiple consecutiv...
Timestamps in UPAS log files In log files written by Ultrasonic Personal Air Samplers (UPAS), you'll...
Are you new to particulate matter (PM) sampling? Have you purchased sample analysis services through...
What is duty cycling? Duty cycling refers to the practice of operating the Ultrasonic Personal Air S...
Our air samplers are durable. A customer once sent a UPAS in for service that had a record 8000+ hou...
We’re a team of mostly scientists and engineers and that means we’re going to come up with nerdy som...
Let me share one of our challenges. It is sometimes difficult to explain what we’re selling. That’s ...
Like many Coloradoans, the team members that make up Access Sensor Technologies’ engineering departm...