APSD of Dry Powder Inhalers (DPIs)

The APSD measurement of DPIs is typically performed under the same conditions as DDU testing, however a Preseparator is typically interposed between the induction port and stage 0 of cascade impactor to capture the large, non-inhalable carrier particles, to prevent impactor over-loading (when using an NGI or ACI). As for delivered dose testing of DPIs, test flow rate is set on the basis of a 4 kPa pressure drop across the device, to approximate the mean patient inhalation flow rate achieved during clinical use.

Please select an option:

NGI Preseparator

NGI Preseparator

For the collection of large mass, non-inhalable powder blouses typically emitted from a DPI prior to entry into the impactor, to prevent impactor over-loading.

  • High capacity
  • High efficiency
  • Two-stage separation
  • Sharp and reproducible cut-point between 10-15 microns (depending on flow rate)
View Brochure
Induction Port P1 Measurement Adapter

Induction Port P1 Measurement Adapter

Used together with the Critical Flow Controller, the Induction Port P1 Measurement Adapter can be placed between the inhaler and the induction port to measure the pressure drop (P1) over the inhaler under test in the absence of a DUSA for DPIs.

View Brochure

Related Applications

We also offer a range of equipment for additional DPI testing application support:

Semi-Automation Tools

Improve efficiency
Reduce variability
Eliminate handling errors
Increase testing capacity

How Does a Cascade Impactor Work?

Play Video

Related Services


We offer a range of training courses, presentations and seminars covering a wide range of topics....

Find out More


A comprehensive range of both in-house and on-site product servicing options are available...

Find out More


Our team of experienced technicians and engineers are on hand to help and advise ...

Find out More

Related News & Resources