Leakage Test - MAGEE Scientific Aethalometer AE33 User Manual

Aethalometer
Model AE33

9.4 Leakage test

Leakage ("zeta", ζ) is the difference between the flow entering the inlet port (F_in) and the
flow passing through the system downstream of the filter (F_out). The difference is due to
tangential leakage through the edges of the filter tape.
ζ=1-(F_in/F_out)
The average leakage is approximately 3% at 5 LPM. This value is taken into account during
the BC calculation (chapter 5.1 Basic calculations). Its average value is entered on the
"Operation" – "Advanced" screen as an operational parameter.
1. For this test you will need the Flow Calibration Pad (black rubber pad with two small holes)
which is supplied as a standard accessory of the AE33; and an air flow meter which you will
connect externally to the sample inlet port.
2. If the measurements are running, press 'Stop'.
3. Go to the "Operation" / "General" screen, and press the "Leakage test" button to start the
test.
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User's manual – Ver. 1.55 July 2017 71/146