---
title: "AST | Accessories: Size-Selective Inlets, Filter Cartridges, and More"
description: Accessories for Access Sensor Technologies air samplers, including size-selective particulate matter inlets, filter cartridges, and more.
image: https://www.accsensors.com/hubfs/Featured_Acessories.jpg
---
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# Inlets and Accessories
Size-Selective Inlets, Filter Cartridges, and More
An inlet, filter cartridge, and sample filter are required to collect a particulate matter sample using an Ultrasonic Personal Air Sampler (UPAS) or Home Health Box (HHB).
The following size-selective PM inlets are available for use with our products:
- PM2.5 @ 1 L min-1
- PM2.5 @ 2 L min-1
- Respirable PM @ 2 L min-1
- PM10/Thoracic @ 2 L min-1.
Cartridges are available for two filter diameters: 37 mm and 25 mm.
Key accessories for size-selective inlets include:
- Flow check adapter:Seals over the inlet so the sample flow rate can be checked against an external flow meter.
- Inlet tool: Used to install and remove inlets on a sampler.
## Technical Resources
[](https://www.accsensors.com/hubfs/Product%20Info%20Sheets/AST-Size-Selective%20Inlets-Product%20Info%20Sheet.pdf?hsLang=en)
### Product Information Sheet
Inlets, cartridges, and accessories, revision 2.7, released May 2026
[Download PDF](https://www.accsensors.com/hubfs/Product%20Info%20Sheets/AST-Size-Selective%20Inlets-Product%20Info%20Sheet.pdf?hsLang=en)
[](https://www.accsensors.com/hubfs/User%20Guides/AST_SizeSelectiveInlets_UserGuide.pdf?hsLang=en)
### User Guide
Size-Selective Inlet User Guide, revision 3.3, released November 2025
[Download PDF](https://www.accsensors.com/hubfs/User%20Guides/AST_SizeSelectiveInlets_UserGuide.pdf?hsLang=en)
[](https://www.zotero.org/groups/2613564/upas/collections/7NNFFM3C)
### Zotero Library
Publications on the design of our UPAS devices and our size-selective inlets
[Link to public Zotero library](https://www.zotero.org/groups/2613564/upas/collections/7NNFFM3C)
# Relevant blog posts
# Recent related blog posts
[](https://www.accsensors.com/blog/estimating-sample-mass?hsLang=en)
## [Estimating sample mass](https://www.accsensors.com/blog/estimating-sample-mass?hsLang=en)
 [Jessica Tryner](https://www.accsensors.com/blog/author/jessica-tryner?hsLang=en)
Feb 15, 2026, 9:38:01 PM
When planning a particulate matter (PM) sampling campaign, you might ask yourself the following...
[Read more](https://www.accsensors.com/blog/estimating-sample-mass?hsLang=en)
[](https://www.accsensors.com/blog/pre-cyclone-impactor?hsLang=en)
## [Introducing the pre-cyclone impactor](https://www.accsensors.com/blog/pre-cyclone-impactor?hsLang=en)
 [Jessica Tryner](https://www.accsensors.com/blog/author/jessica-tryner?hsLang=en)
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...
[Read more](https://www.accsensors.com/blog/pre-cyclone-impactor?hsLang=en)
[](https://www.accsensors.com/blog/overloading?hsLang=en)
## [Sample overloading: Identifying and addressing issues](https://www.accsensors.com/blog/overloading?hsLang=en)
 [Jessica Tryner](https://www.accsensors.com/blog/author/jessica-tryner?hsLang=en)
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...
[Read more](https://www.accsensors.com/blog/overloading?hsLang=en)
**General:**
[UPAS v2.1 - Product information sheet](https://www.dropbox.com/scl/fi/9lu3gc0xdh7cw6bp0mrxw/AST-UPAS-v2.1-Product-Info-Sheet-Version-1.2-20240730.pdf?rlkey=dhly70ewrcp9nh0b2s6pqgww1&dl=0)
[UPAS v2.1 and v2.1 PLUS - User Guide](https://www.dropbox.com/scl/fi/kyaxdhllweit5guhu7gdv/AST_UPAS-v2.1-and-UPAS-v2.1-PLUS_UserGuide_20240730.pdf?rlkey=mr11py6j1ybsr78hosldavn9m&dl=0)
Zotero library of publications that feature the UPAS
AST Wiki
Firmware and app:
[UPAS v2.1- iOS mobile device app](https://apps.apple.com/us/app/ast-upas/id1543735564)
UPAS v2.1- Android mobile device app
[UPAS v2.1 and v2.1 PLUS - Firmware](https://www.dropbox.com/scl/fo/hj3ybu95iqvc1yowf4eik/AE7Jqy65dLy_9sL7nF-VzJs?rlkey=gnwrzldurdy3piwy4hjwg3bq2&dl=0)
Tools for data analysis:
[R Shiny application for data visualization](https://accsensors.shinyapps.io/shinyAST/)
[GitHub: astr R package for working with UPAS log files](https://github.com/accsensors/astr)
## Related Blog Posts
[Measuring Indoor Air Pollution on a Hut Trip with the UPAS v2.1 PLUS](https://www.accsensors.com/from-the-access-sensor-tech-team/measuring-indoor-air-pollution-on-a-hut-trip-with-the-upas-v2?hsLang=en)
## Pricing
Our product pricing for customers based in the United States is shown below. [Request a quote](https://www.accsensors.com/quote?hsLang=en) to receive information about academic and nonprofit discounts. If you're based outside the United States, check to see if your region is covered by one of our [distributors](https://www.accsensors.com/distributors?hsLang=en) and, if so, contact that distributor for country-specific pricing.
## Size-selective inlets
### Inlet: PM2.5 1 LPM
$163.00
GEN2
[Request quote](https://www.accsensors.com/quote?hsLang=en)
### Pre-cyclone impactor
$92.00
For GEN2 PM2.5 1 LPM inlet only. Requires G2P3R1 cyclone insert.
[Request quote](https://www.accsensors.com/quote?hsLang=en)
### Inlet: PM2.5 2 LPM
$163.00
GEN2
[Request quote](https://www.accsensors.com/quote?hsLang=en)
### Inlet: PM10 2 LPM
$163.00
GEN2
[Request quote](https://www.accsensors.com/quote?hsLang=en)
### Inlet: Respirable 2 LPM. Only available upon special request.
GEN2
[Request quote](https://www.accsensors.com/quote?hsLang=en)
### Open-faced inlet
$167.00
Inlet only; UPAS not included; sample without selecting for a specific particle size; compatible with flow check adapter; requires open-faced filter cartridge
[Request quote](https://www.accsensors.com/quote?hsLang=en)
## Filter cartridges
### 37 mm
$16.00
GEN2; compatible with all GEN2 inlets
[Request quote](https://www.accsensors.com/quote?hsLang=en)
### 25 mm
$16.00
GEN2; compatible with all GEN2 inlets
[Request quote](https://www.accsensors.com/quote?hsLang=en)
### Open faced
$17.00
37 mm; for use with open-faced inlet only; UPAS not included
[Request quote](https://www.accsensors.com/quote?hsLang=en)
### Storage case
$2.00
Polypropylene case for 37- and 25-mm filter cartridges; snaps closed; filter cartridge not included.
[Request quote](https://www.accsensors.com/quote?hsLang=en)
## Tools
### Inlet tool
$54.00
Required to install and remove GEN2 inlets
[Request quote](https://www.accsensors.com/quote?hsLang=en)
### Flow check adapter
$116.00
Optional: Seal over a GEN2 inlet to connect to an external flow meter and check the sample flow rate
[Request quote](https://www.accsensors.com/quote?hsLang=en)
### Filter cartridge opening tool
$6.00
Optional: Makes it easier to open filter GEN2 cartridges
[Request quote](https://www.accsensors.com/quote?hsLang=en)
## Charging adapters
### UPAS USB charging adapter (US)
$27.00
USB charging adapter and USB to micro-USB cable. United States wall adapter. Compatible with UPAS v2.0, v2.1, and v2.1 PLUS.
[Request quote](https://www.accsensors.com/quote?hsLang=en)
### UPAS USB charging adapter (EU)
$27.00
USB charging adapter and USB to micro-USB cable. European wall adapter. Compatible with UPAS v2.0, v2.1, and v2.1 PLUS.
[Request quote](https://www.accsensors.com/quote?hsLang=en)
# Forms
[](https://www.accsensors.com/freetrial?hsLang=en)
### Request a free product demonstration
We can send you hardware to try for a few weeks before you buy. This demonstration is free as long as the product is returned at the end of the demonstration period. No purchase is required. Fill out and submit this [form](https://www.accsensors.com/freetrial?hsLang=en) to request a demonstration unit.
[](https://www.accsensors.com/quote?hsLang=en)
### Request a quote
Fill out and submit this [form](https://www.accsensors.com/quote?hsLang=en) to request a quote. It's okay if you still have questions and aren't sure which products and accessories you need. You can enter your questions on the form and we'll get back to you.
[](https://www.accsensors.com/support-request-form?hsLang=en)
### Request service
Have a technical question? Fill out and submit this [service request form](https://www.accsensors.com/support-request-form?hsLang=en).
###### [Products](https://www.accsensors.com/products?hsLang=en)
[UPAS v2.1](https://www.accsensors.com/upasv2.1?hsLang=en)
[UPAS v2.1 PLUS](https://www.accsensors.com/upasv2.1plus?hsLang=en)
[UPAS v2.0](https://www.accsensors.com/upasv2.0?hsLang=en)
[Home Health Box](https://www.accsensors.com/indoor_sampling?hsLang=en)
[Inlets and Accessories](https://www.accsensors.com/accessories)
[UPAS Outdoor Enclosure](https://www.accsensors.com/upas_outdoor_enclosure?hsLang=en)
[Sample Analysis](https://www.accsensors.com/sample-analysis?hsLang=en)
###### Technical Resources
[Applications Blog](https://www.accsensors.com/from-the-access-sensor-tech-team?hsLang=en)
[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?hsLang=en)
[Request a Quote](https://www.accsensors.com/quote?hsLang=en)
[Request Support](https://www.accsensors.com/support-request-form?hsLang=en)
[Our Team](https://www.accsensors.com/about?hsLang=en)
[Distributors](https://www.accsensors.com/en-us/distributors?hsLang=en)
[contact@accsensors.com](mailto:contact@accsensors.com)
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---
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