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12 I 77
The ST1 safety weighing enclosures prevent aerosols and/or dust from escaping from the
interior of the enclosure. People and the environment are effectively protected from
contamination when the equipment is used as intended.
The ST1 safety weighing enclosures are to be understood as a system with an integrated
extraction system as a closed design, as the leakage of hazardous substances into the air of
the room outside the weighing enclosure is prevented. Leakage of airborne substances is
prevented by convection and diffusion of the incoming air and the design of the working
opening.
The ST1 safety weighing enclosures have been exemplarily tested according to the
guidelines of the ISPE (Institute of Pharmaceutical Engineers) for their suitability for the safe
weighing of smaller sample quantities of hazardous substances. The exposure control limit
(ECL) tested for weighing and small-scale handling of hazardous substances in quantities of
up to 1 g is less than 20 ng/m³.
The special features of the ST1 safety weighing enclosures are:
Low-turbulence, horizontal air flow over the entire work area
Specially shaped edges to guide air in the edge sections to prevent contaminated air
from escaping
Ergonomically shaped arm bar
Easy-to-clean cover of the air collection chamber
Independent, separate filter housing to avoid vibrations in the weighing enclosure and to
maintain the scale functionality
HEPA filtration system for safe, low-contamination filter changes
Alarm system with two flow sensors
Chemical-resistant ceramic work surface
Waste system with inner and outer waste bag for contamination-free waste disposal
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