Wesemann SYSTEM DELTA 30 User Manual page 47

User Manual | Laboratory Fume Cupboard | Commissioning of laboratory fume cupboard 47
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) splinters. 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.
If the sash is moved downwards beyond the limiter, and thus the height of the opening is less than 500 mm, the
twist-release mechanism is automatically locked again: Both warnings are automatically deactivated.
ELECTRICAL OPERATION
If the sash is in a stationary position, the sash can be opened and closed with the sash handle bar. Electric drive
and sash are decoupled when in inactive state.
By pressing the button OPEN SASH, the sash moves to the opening limit of 500 mm. By pressing the OPEN
or CLOSE button, the sash stops immediately. The limitation is stipulated in accordance with the standard. This
limitation is for the safety of the user as, when the sash is open, the escape of noxious substances is higher and