Thermo Electron Led Gmbh

Christoph Noll

Olaf Broemsen

Edmund Frickel

Gerd Ross

Oliver Rupp

Patrick Fanta

Gerhard Schuck

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

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

The present invention relates to a safety workbench having a working chamber enclosed by a housing and a housing front side, which has a work opening, which is closable by an adjustable front pane, the front pane having at least one additional cleaning position, in which it is situated at least partially below a closed final position, in which the work opening is completely covered, in such a way that a cleaning opening is formed between pane top edge and housing. The front pane is easier and safer to clean than the previously known safety workbenches due to this additionally provided cleaning position.

Safety workbench having easy-to-clean front pane

The present invention relates to a safety workbench having a working inner chamber enclosed by a housing, whose bottom terminus is formed by a floor trough and which is accessible on a housing front side via a work opening closable using an adjustable front pane. The floor trough is implemented as double-walled and has an internal and an external wall, which enclose an intermediate chamber, which may be placed under vacuum, between them, at least one of the walls having at least one opening which is connected to means for generating the partial vacuum.

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Gruendau, Germany

Christoph Noll