Variable speed controlled ventilation ensures safe working conditions in a research laboratory
In a research laboratory, toxic materials are handled inside protective glove boxes. A highly efficient suction system is required to remove the dangerous gases when the glove box is opened. If the ventilation fans are working at a constant speed, the suction pressure may be too high. This causes samples to evaporate and leads to difficulties in opening the glove box. Too low suction pressure allows the toxic gas to escape into the room.
Using an ABB frequency converter and AC motor the suction fan can be controlled easily and safely . When the glove boxes are closed the suction power needed is extremely low. However, when several boxes are opened simultaneously, the suction power needs to be rapidly increased. With ABB's frequency converter, the fan speed is always maintained at the optimal, safe level.
Diagram of the glove box ventilation system
Solved Problem
- Too much suction resulting in the evaporation of samples
- Too little suction causing the release of toxic gases
Solution
- Frequency converter: 120 kVA
- Motor: 75 kW, 1500 rpm
- Voltage: 415 V, 50 Hz
Benefits
- Stepless speed control gives safe and efficient working conditions
- Energy savings from reduced suction power
- Lower investment with integrated ventilation system