Safety workbench with controlled circulating air flow and method for its operation

摘要: The invention relates to a safety workbench (1) having work space (3) surrounded by housing (2) opening (6) located in the front side (4) and adjustable with an panel (5) for admitting into air inlet flow (7), exhaust blower (8) circulating (9) conveying (10) (1), which are designed such that partial drawn is filtered through filter (11) as (12) from (13) downwardly directed (14) (3), control device (15), differential pressure sensor (16) two transducers (17, 18) connected thereto measure at different positions within d, wherein first of sensors (17) arranged immediate vicinity fan blades (90) on low (91) second (18) low-flow area, (20) (9). further method operating according any preceding claims, comprising steps of: a) determining difference between transducer means (16), b1) comparing determined nominal stored corresponds volume flow, or b2) converting measured associated calculated one c) regulating conveyed.