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ADD 536 Aerosol Distribution System

Aerosol Distribution and Dilution System ADD 536 for protection grade measurements in operating rooms according to DIN 1946-4

The Aerosol Distribution and Dilution System ADD 536 was developed by Topas for protection grade measurement in operating rooms according to DIN 1946-4 and SWKI VA105-01 (formerly SWKI 99-3). It provides test aerosol generated by an aerosol generator (e.g. Topas ATM 228) at six different outlet ports with a defined source flow, especially for verification of hospital operating rooms.
Aerosol Distribution and Dilution System ADD 536, front view ADD 536 aerosol ejectors ADD 536 with set "DIN 1946" and screen
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 VA105-01 (formerly SWKI 99-3). For that reason a total particle rate of 6,3 × 109 #/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


DIN 1946-4
VDI 2167-1
SWKI 99-3
SWKI VA105-01
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  • designed to comply with the requirements of the national guidlines/standards DIN 1946-4 and SWKI VA105-01 (formerly 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


  • protection grade measurement of operating rooms/theatres according to DIN 1946-4 and SWKI VA105-01 (formerly SWKI 99-3) and VDI 2167-1
  • 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)

The ADD 536 mixes the aerosol provided by an aerosol generator (e.g.: ATM 228) with a defined transport flow rate and distributed it to six vents and a particle counter port.
The operation of the ADD 536 requires an additional suitable aerosol generator (aerosol flow rate up to 5 L/min, particle generation rate > 6,3 10⁹ #/min) and a suitable particle counter (sample flow rate of 2,83 L/min or 28,3 L/min).

Parameter title Unit Value
aerosol, volumetric flow rate L/min min. 100 (devices supplied 100 L/min transport air)
power supply - 230 V AC
operating medium, gas/air - ambient air (fitlered internally)
operating medium, aerosol - aerosol from additional aerosol generator
vents for aerosol outlet - quantity 6, diameter 65 mm
hose connector, vents - quantity 6 | outer diameter 10 mm
hose connector, particle counter - quantity 1 | diameter 10 mm
dimensions (w × h × d) mm 250 × 340 × 330
weight kg 8,5