Wesemann SYSTEM DELTA 30 User Manual page 48

48
User Manual | Laboratory Fume Cupboard | Commissioning of laboratory fume cupboard
the user is not protected against the spraying out of hazardous substances and flying (glass) splinters.
Due to the low working height, an opening limiter is not prescribed in the case of low and walk-in fume
cupboards.
It is possible to unlock the limitation of the sash to enable, for example, the positioning of high experimental
set-ups in the fume cupboard. By turning the sash handle bar and by means of the twist-unlock mechanism, the
limiter is unlocked and the sash can be moved further upwards over the work opening.
If the height of the opening is exceeded by unlocking the limiter, an optical and acoustic alarm is triggered. This
alarm function alerts the user to the fact that the protective function of the fume cupboard is no longer present
and that he is not protected against harmful substances and flying glass. The alarm can be acknowledged by
pressing the RESET button on the exhaust air function display.
The optical warning by the yellow flashing LED draws attention to the operating mode and the fact that the sash
is more than 500 mm open and that the sash is to be closed.
By pressing the button CLOSE SASH, the sash moves downwards. By repeated pressing of the OPEN or
CLOSE button, the sash stops immediately. If the sash moves down beyond the limiter and thus the height of
the opening is less than 500 mm, the twist-release mechanism is locked again. Both warning are automatically
deactivated.