--- title: Access Sensor Technologies' Blog | size-selective inlets description: size-selective inlets | Advice for collecting air samples using Access Sensor Technologies' Ultrasonic Personal Air Sampler (UPAS) and Home Health Box (HHB). --- [Skip to content](https://www.accsensors.com/blog/tag/size-selective-inlets#main-content) [![AST](https://www.accsensors.com/hs-fs/hubfs/AST.jpg?width=2303&height=774&name=AST.jpg)](https://www.accsensors.com/) - [Products](https://www.accsensors.com/products) Show submenu for Products - [UPAS v2.1](https://www.accsensors.com/upasv2.1) - [UPAS v2.1 PLUS](https://www.accsensors.com/upasv2.1plus) - [UPAS v2.0](https://www.accsensors.com/upasv2.0) - [Home Health Box](https://www.accsensors.com/indoor_sampling) - [Inlets and Accessories](https://www.accsensors.com/accessories) - [UPAS Outdoor Enclosure](https://www.accsensors.com/upas_outdoor_enclosure) - [Sample Analysis Services](https://www.accsensors.com/sample_analysis) - Technical Resources Show submenu for Technical Resources - [Applications Blog](https://www.accsensors.com/blog) - [R Shiny Application](https://accsensors.shinyapps.io/shinyAST/) - [astr R Package](https://github.com/accsensors/astr) - [YouTube](https://www.youtube.com/channel/UCbbSB_ja8JY-xX90D94qyKA) - Contact Us Show submenu for Contact Us - [Request Free Demo](https://www.accsensors.com/freetrial) - [Request a Quote](https://www.accsensors.com/quote) - [Request Support](https://www.accsensors.com/support-request-form) - [Our Team](https://www.accsensors.com/about) - [Distributors](https://www.accsensors.com/distributors) Open main navigation Close main navigation - [Products](https://www.accsensors.com/products) Show submenu for Products - [UPAS v2.1](https://www.accsensors.com/upasv2.1) - [UPAS v2.1 PLUS](https://www.accsensors.com/upasv2.1plus) - [UPAS v2.0](https://www.accsensors.com/upasv2.0) - [Home Health Box](https://www.accsensors.com/indoor_sampling) - [Inlets and Accessories](https://www.accsensors.com/accessories) - [UPAS Outdoor Enclosure](https://www.accsensors.com/upas_outdoor_enclosure) - [Sample Analysis Services](https://www.accsensors.com/sample_analysis) - Technical Resources Show submenu for Technical Resources - [Applications Blog](https://www.accsensors.com/blog) - [R Shiny Application](https://accsensors.shinyapps.io/shinyAST/) - [astr R Package](https://github.com/accsensors/astr) - [YouTube](https://www.youtube.com/channel/UCbbSB_ja8JY-xX90D94qyKA) - Contact Us Show submenu for Contact Us - [Request Free Demo](https://www.accsensors.com/freetrial) - [Request a Quote](https://www.accsensors.com/quote) - [Request Support](https://www.accsensors.com/support-request-form) - [Our Team](https://www.accsensors.com/about) - [Distributors](https://www.accsensors.com/distributors) - [Try for Free](https://www.accsensors.com/freetrial) [Try for Free](https://www.accsensors.com/freetrial) # Air Sampling Made Simple Blog This is a search field with an auto-suggest feature attached. - There are no suggestions because the search field is empty. [![An equation illustrating how to estimate the mass of particulate matter that will be accumulated on a filter during a sample.](https://www.accsensors.com/hubfs/Blog_EstimatingSampleMass_CoverImage-1.png)](https://www.accsensors.com/blog/estimating-sample-mass) ## [Estimating sample mass](https://www.accsensors.com/blog/estimating-sample-mass) ![Picture of Jessica Tryner](https://www.accsensors.com/hs-fs/hubfs/JT_20250309_square.jpeg?width=50&name=JT_20250309_square.jpeg) [Jessica Tryner](https://www.accsensors.com/blog/author/jessica-tryner) Feb 15, 2026, 9:38:01 PM When planning a particulate matter (PM) sampling campaign, you might ask yourself the following ques... [![An illustration showing how the pre-cyclone impactor is assembled into the GEN2 PM2.5 1 LPM inlet.](https://www.accsensors.com/hubfs/Blog_PCI_CoverPhoto.png)](https://www.accsensors.com/blog/pre-cyclone-impactor) ## [Introducing the pre-cyclone impactor](https://www.accsensors.com/blog/pre-cyclone-impactor) ![Picture of Jessica Tryner](https://www.accsensors.com/hs-fs/hubfs/JT_20250309_square.jpeg?width=50&name=JT_20250309_square.jpeg) [Jessica Tryner](https://www.accsensors.com/blog/author/jessica-tryner) Jul 31, 2025, 3:16:37 PM What is the pre-cyclone impactor? The pre-cyclone impactor is a device that can be installed in our ... [![A photograph of an overloaded particulate matter sample filter.](https://www.accsensors.com/hubfs/Blog_Overloading_CoverPhoto.jpg)](https://www.accsensors.com/blog/overloading) ## [Sample overloading: Identifying and addressing issues](https://www.accsensors.com/blog/overloading) ![Picture of Jessica Tryner](https://www.accsensors.com/hs-fs/hubfs/JT_20250309_square.jpeg?width=50&name=JT_20250309_square.jpeg) [Jessica Tryner](https://www.accsensors.com/blog/author/jessica-tryner) Jul 31, 2025, 3:15:09 PM What does it mean for a sample to be "overloaded"? When a sample is said to be "overloaded," that ge... [![Photograph of a PM2.5 1 LPM inlet for particulate matter samplers sold by Access Sensor Technologies. This inlet consists of a round aluminum cap that is approximately 2 inches in diameter and anodized black.](https://www.accsensors.com/hubfs/Blog_PM2.51LPM-1.jpg)](https://www.accsensors.com/blog/revised-pm2.5-1-lpm-cyclone-design) ## [Revised PM2.5 1 LPM cyclone design](https://www.accsensors.com/blog/revised-pm2.5-1-lpm-cyclone-design) ![Picture of Jessica Tryner](https://www.accsensors.com/hs-fs/hubfs/JT_20250309_square.jpeg?width=50&name=JT_20250309_square.jpeg) [Jessica Tryner](https://www.accsensors.com/blog/author/jessica-tryner) Nov 18, 2024, 7:59:08 PM Access Sensor Technologies has improved the design of our PM2.5 1 LPM cyclone inlet to achieve a pen... ###### [Products](https://www.accsensors.com/products) [UPAS v2.1](https://www.accsensors.com/upasv2.1) [UPAS v2.1 PLUS](https://www.accsensors.com/upasv2.1plus) [UPAS v2.0](https://www.accsensors.com/upasv2.0) [Home Health Box](https://www.accsensors.com/indoor_sampling) [Inlets and Accessories](https://www.accsensors.com/accessories) [UPAS Outdoor Enclosure](https://www.accsensors.com/upas_outdoor_enclosure) [Sample Analysis](https://www.accsensors.com/sample-analysis) ###### Technical Resources [Applications Blog](https://www.accsensors.com/from-the-access-sensor-tech-team) [R Shiny Application](https://accsensors.shinyapps.io/shinyAST/) [astr R Package](https://github.com/accsensors/astr) [YouTube](https://www.youtube.com/channel/UCbbSB_ja8JY-xX90D94qyKA)       ###### Contact Us [Request a Free Demo](https://www.accsensors.com/freetrial) [Request a Quote](https://www.accsensors.com/quote) [Request Support](https://www.accsensors.com/support-request-form) [Our Team](https://www.accsensors.com/about) [Distributors](https://www.accsensors.com/en-us/distributors) [contact@accsensors.com](mailto:contact@accsensors.com)     ###### Legal [Privacy Policy](https://www.accsensors.com/privacypolicy) [Terms and Conditions](https://www.accsensors.com/termsanduse) [FCOI](https://www.accsensors.com/fcoi)         [linkedin-in icon](https://www.linkedin.com/company/access-sensor-technologies/mycompany/?viewAsMember=true) [Check out our YouTube channel.](https://www.youtube.com/channel/UCbbSB_ja8JY-xX90D94qyKA) [Link to our GitHub](https://github.com/accsensors) --- Access Sensor Technologies | 320 E Vine Dr. Ste. 221 | Fort Collins, CO 80524