The Aerosol Distribution and Dilution System ADD 536 was developed by Topas for protection grade measurement in operating rooms according to SWKI 99-3 and DIN 1946-4. It provides test aerosol generated by an aerosol generator (e.g. Topas ATM 226) at six different outlet ports with a defined source flow, especially for verification of hospital operating rooms.
Hospital operating rooms are specially designed to avoid contaminations and therefore additional infections of patients during operations. To assure a low level of particle contaminations a laminar air flow is applied to the operating table. To verify the retention efficiency of this flow regime a verification with a defined test aerosol is required according to the standards DIN 1946-4 and SWKI 99-3. For that reason a total particle rate of 6.3·109 P/min has to be distributed to six different positions and emitted with a reliable long term stability. From the standards it is also required that this total particle rate is continuously monitored and controlled by a particle counter.
The Aerosol Ditribution and Dilution System meets all these required demands for providing a defined test aerosol with the following features:
- Internal generation of a total nominal flow (free of particles) for supplying the six outlet ports
- Homogeneous mixing of the test aerosol coming from an external aerosol generator with this total transportation flow
- Internal adjustable aerosol dilution ratio for direct connection of a particle counter (e.g. Topas LAP 340) used for controlling a stable particle rate
- Uniform aerosol distribution to six outlet ports
- By an external particle counter continuously controlled particle production rate
- Compact portable design, easy to setup
- Internal generation of particle free transportation flow without requesting a compressed air source
- Integrated, highly efficient aerosol dilution, with a wide range of adjustable dilution ratios with excellent reproducibility to be directly connected to particle counter
- Electronically controlled and adjusted dilution ratio adapted to particle counter in use