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The ST1 safety weighing enclosures work with a low-turbulence air flow which enables
optimum interaction between the scale and the enclosure. Extraction and filtration are done
by a separate filter unit, separated from the enclosure to achieve good vibration decoupling
and to isolate the contaminated filter.
The ST1 series is designed to create a horizontal, low-turbulence airflow over the entire work
surface. The air flow transfers any exposures that may occur during weighing to the HEPA
filtration system which retains them. The resulting exhaust air is thus free of pollutants and
is fed back into the room. Alternatively, a connection to a house ventilation system (via
draught diverter) is possible.
The motor-driven filter housing ensures a constant air flow through the working opening into
the interior of the enclosure. Due to the constant air volume (CAV), no exposures can escape
through the work opening and endanger the user.
The air requirement of the ST1 safety weighing enclosure is low and uniform compared to
other exhaust systems. The constant volume requirement enables problem-free integration
into existing exhaust air systems.
The ST1 safety weighing enclosure is equipped with an H14 HEPA filtration system (high-
efficiency particulate air filter) which has a retention rate of at least 99.995%. It is suitable
for an operating time of up to 3 years (manufacturer's recommendation).
A visual and acoustic alarm is triggered when the air flow falls below a limit value defined on
the alarm system, for example when the front flap is opened.
Unique to the ST1 series safety weighing enclosures is the monitoring of the air flow with a
separate sensor on the outside of the work opening. In contrast to other systems where the
air flow is only measured in the exhaust air pipe, the ST1 safety weighing enclosure allows
the current conditions to be measured at the working opening.
The special frame construction of the work surface provides protection against leaking
liquids. In case of leakage of liquids in relatively small quantities, these are retained in the
enclosure. The double bag waste system (optional) with inner and outer waste bag enables
contamination-free discharge of waste from the inner area of the enclosure.
In addition, a special profile of the arm bar ensures optimisation of the air flow over the base
plate of the ST1 safety weighing enclosure and enables the air flow not to be interrupted
even under the arms. The area at the arm bar forms the transition between the safe and the
hazardous, potentially contaminated area. The arms can be supported on the arm bar to
allow ergonomic, relaxed working inside the ST1 safety weighing enclosure.
An ergonomic design is an important aspect, as the user can lean forward to the scale to
weigh even the smallest sample quantities. The bevelled front of the ST1 safety weighing
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