Flow Meters

Both DDU and APSD data can be severely compromised if the inlet flow rate (the flow rate at the entrance to the induction port or DUSA) used during testing is inaccurate and/or inconsistent, generating discrepancies with regard to its effects on both the cascade impactor itself and the inhaler under test.
Copley offers Flow Meters with the required range and accuracy to measure the flow in inhaler testing systems.


DFM4 - Flow Meter

Operating on the Differential Pressure (Venturi) principle, the Flow Meter Model DFM4 gas a range of 105 L/min, a resolution of 0.1 L/min and an accuracy of +/- 2% or 0.7 L/min, whichever the greater. Its robust design and method of operation means that an inlet filter is not required in routine use. A calibration kit is also available for routine calibration by the user.

Product Features
Portable Hand-Held
Venturi (Pressure Drop)
Flow Tube
Metal with 12mm fitting at outlet
10-105 L/min
+/- 2% or 0.7 L/min (whichever the greater)
0.1 L/min
Power Source
Universal mains input voltage
Flow Resistance
Low (1.0 kPa @ 100 L/min)
Outlet flow calibration
For outlet flow (preferred)
Volumetric flow measurement
Direct measurement
Inlet filter
Not required
Use 'in-line'
Cannot be used 'in-line'
Data Output
RS232 (Flow Rate & Calibrate Data)
Calibration kit available for user calibration

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