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Exhausted filter (flow rate cannot longer maintained by the flow controller)
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Collected activity exceeds a pre-set limit
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Fixed period (e.g. each interval, each day)
In delivery state, the filter only will step in case of exhaustion. Please read chapter "User specific
settings" for more information regarding additional stepping conditions.
3. 1. Filter sealing mechanism
The filter sealing mechanism avoids the partial bypass of the air stream trough the filter. A soft
rubber sealing will be pressed onto the backside of the filter while sampling. As soon as the pump
stops, the filter sealing will be released (e.g. during automatic filter stepping). Please take care that
the rubber sealing (O-Ring) is always placed correctly in the notch of the filter holder. The filter
holder must be easily movable within the guideway.
3. 2. Replacing the filter
The measurement has to be stopped before changing the filter. The filter unit can be accessed
opening the door of the enclosure.
3. 2. 1. Filter replacement for instruments with filter cartridge
The picture below shows the filter unit with manually replaceable filter cartridge.
1) Air inlet connection
2) Detector cap
3) Filter sealing plate
4) Filter cartridge
5) Filter support
6) Filter sealing mechanism
SARAD GmbH 2023
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Unit with filter cartridge
Manual_Aer 5400_EN_27-04-2023.docx
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Aer 5400
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