MAGEE Scientific Aethalometer AE33 User Manual page 88

Aethalometer
Model AE33
9.13 Cartridge Filter Replacement
The bypass cartridge filter is located above the optical chamber and is clearly visible behind
the front door. It should be changed on an annual basis, or earlier if needed at stations with
high aerosol loading. This is indicated if the filter color is darker than "medium gray", looks
blackened and dirty, or if the Clean Air test results yield a BC concentration much higher than
zero.
1. For this procedure you will need a new cartridge filter, and a medium-size flat screwdriver.
2. The cartridge filter is located on the top of the optical chamber.
3. If the measurements are running, press 'Stop'. This procedure can also be done when the
instrument power is switched off.
4. Open the front door to access the cartridge filter. Note the orientation of the air flow
indicator arrow, from left to right.
5. The filter and its fittings are installed in "grip adapters" which must be released by pressing
down using a flat screwdriver.
6. Press down on the white ring of the outer grip connector on one side of the filter and pull
the elbow connector up and out of the connector.
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User's manual – Ver. 1.55 July 2017 88/146