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The Pharmacopoeias recommend stage mensuration at regular intervals to ensure that only impactors within specification are used for testing inhaler output.
Unfortunately, because of the instrumentation, skill and time required to conduct a test, it is not practical to use stage mensuration on, for example, a daily basis. Currently, therefore, there is no practical means of checking the system suitability of an impactor on a daily or individual test basis.
Nozzle dimensional performance can however be indirectly monitored by measuring the pressure drop (Delta-P) across each stage of the impactor at a particular flow rate by using a suitable “Delta-P” Apparatus linked to a Flow Resistance Monitor.
For comprehensive product details, specifications and part numbers, please request a copy of our brochure “Quality Solutions for Inhaler Testing”.
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