Critical Flow Controller Model TPK
A number of factors can have a significant effect on the testing of Dry Powder Inhalers:
- The resistance to flow posed by the inhaler under test
- The appropriate flow rate, Q, required to generate a 4 kPa pressure drop over the inhaler concerned
- The duration of the inspiration required to give the specified test volume
- The stability of the flow rate in terms of critical (sonic) flow
The “Apparatus suitable for measuring the uniformity of delivered dose for powder inhalers” and the “Experimental set-up for testing powder inhalers” described in Ph.Eur. in Chapters 0671 and 2.9.18 respectively and “Apparatus B: Sampling Apparatus for dry powder inhalers” and the “Apparatus 2, 3, 4 or 5: General control equipment” described in USP Chapter 601 take all of these factors into account.
These specifications form the basis of the Critical Flow Controller Model TPK which incorporates all of the equipment required into a single integrated system.
Two versions are available, the TPK and TPK-R.
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