ADD 536: Aerosol Distribution and Dilution System
For protection grade measurement in operating rooms according to SWKI 99-3 and DIN 1946-4 Topas developed the Aerosol Distribution and Dilution System ADD 536. 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
Advantages
- Reliable and extremely high single-stage dilution
- Designed to comply with the requirements of the German standard DIN 1946-4 and the Swiss guideline SWKI 99-3
- Reliable particle generation rate with an excellent long term stability (particles/time)
- Status information on dilution ratio and total flow rate integrated at the front
Applications
- Protection grade measurement of operating rooms/theatres according to German DIN 1946-4 and Swiss SWKI 99-3 and VDI 2167 Part 1
- Generation of test aerosols by providing a reliable, reproducible, long term constant, but concentration variable particle stream in connection with a high-concentration particle source e.g. for verification or calibration of particle counters (dilution series with PSL aerosols)
