Division:
32 I 77
Alarm system
If the alarm system is switched off, the inflow velocity is not monitored and
there is a risk of contamination.
The ST1 safety weighing enclosure must not be used if the alarm system is
switched off.
Improper installation, modifications, calibration and adjustment of the inflow
velocity will cause the system to operate incorrectly, which may lead to
contamination.
The alarm system may only be installed by a1-envirosciences qualified
personnel or personnel specifically authorised for this purpose. Installation
by a1-envirosciences is included in the delivery.
The settings of the flow velocities or the calibration of the sensors must only
be changed by the technical service of a1-envirosciences.
Structure and function of the alarm system
The alarm system monitors the incoming air velocity at the enclosure opening via a pressure
difference sensor. By permanently displaying a safe operating state as well as an audio-
visual warning in case the alarm threshold being undershot, the user is guaranteed safe
working conditions in the safety weighing enclosure.
The alarm system detects low flow velocities in the range of 0.1 m/s to 0.6 m/s. The
operating speed at the access opening of the safety weighing enclosure is 0.4 m/s and is set
exclusively by qualified a1-envirosciences service technicians.
Risk of contamination when the alarm system is switched off
Risk of contamination in case of malfunction of the alarm system
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