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Improper installation may result in damage to the filter. Only a correct
procedure ensures that the filter is installed properly and can be changed
without contamination.
Setting or adjustment of the inflow velocity may only be carried out by
a1-envirosciences technicians or authorised personnel. There is a risk of
contamination if the inflow velocities are not set correctly!
After installation and after each change of the HEPA filter, the function (filter
integrity) of the installed HEPA filter must be checked. For this purpose, a
DOP test (Dispersed Oil Particulate) is carried out.
If a DOP test is not carried out, the functionality of the ST1 safety weighing
enclosure cannot be guaranteed and there could be a significant risk of
contamination.
Once installed, a filter housing with a qualified HEPA filter must not be
moved or opened.
Easy access for regular maintenance and possible filter change must be
ensured.
Annual maintenance of personal protection enclosures is required either by
law or the operator, depending on the risk assessment of the hazardous
substances used.
a1-envirosciences strongly recommends having the unit serviced annually and
the HEPA filters replaced every 3 years.
Notes on maintenance and filter change
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