Division:
29 I 77
Filter units
The filter units are used to retain solid exposures and aerosols (HEPA filters) or other
substances, such as solvent vapours (carbon filters).
The filtration system must not be opened by unauthorised personnel. The risk
of contamination of the environment and the people in it is very high!
The filter units consist of a box-shaped housing containing a filter cube and a radial fan. The
air is sucked in at the top via the connection pipe, passed through the HEPA filter (high-
efficiency particulate air filter) and blown out again at the side of the outlet.
The air flow velocity can only be adjusted by an a1-envirosciences service technician. During
the calibration process, the service technician sets an operating speed of 0.4 m/s at the
opening of the enclosure. The calibration is controlled on the display (1) connected to the
filter unit (3) through the e-box (2). Once set, this ensures that the required inflow velocity is
maintained (CAV = Constant Air Volume).
Figure 10 - Schematic representation of the installed peripheral equipment on an ST1 safety weighing enclosure
Risk of contamination when opening the filtration system
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