Applied Physics
Cascade Impactor for Aerosol Particle Sampling
Aerosol research

Cascade Impactors

Cascade Impactor

Please visit our main site at Applied Physics, which provides information on a Cascade Impactor for particle sampling in aerosols. Flow rates range from 1 LPM to over 100 LPM, while size capture ranges from below 10nm and above 20 microns. Cascade Impactors are used for indoor and out door particle sampling, such as particle research, smoke stack analysis, and more. A cascade impactor can be designed with a rotate capability or no rotate. The difference being rotate allows the particle sample to be spread across a collection surface.

Cascade impactors use various nozzles nozzles to reduce jet velocity, pressure drop, particle bounce, re-entrainment and evaporative loss.Pressure sensors can monitor the pressure in the stages and the stability of air flow. Should a nozzle become partially clogged during sampling, change in stage pressure drop will be noticed. Electronic control can be added to monitor the instrument operation and record environmental and pressure data for post-sampling review.

Removing a stage from a cascade impactor can cause the absolute pressure and the cut-size characteristics to change for down-stream stages. For this reason, only the upper stages with cut-size ≥0.56 microns should be considered for removal where necessary. Electronics can be used for controlling the volumetric flow, monitoring and recording the output of the pressure transducers for absolute pressure monitoring. Pressure changes may indicate flow instability due to nozzle clogging or leakage in the airflow.

Desired Features
1) Sampling flow rate:
2) Size intervals and stage cut-sizes
3) Easily removable collection substrates allow for quick turn-around time for productive use of the instrument.
4)  Flow control
5) Electronics Control, such as temperature and pressures monitoring, recorded, and stored at pre-determined time intervals.
6) Absolute pressures are monitored on the lower stages to provide indication for possible clogging of nozzles as small as 50 microns in diameter
7) Sharp cut-off size characteristics
8) Low inter-stage losses
7) Many nozzles to reduce jet velocity, pressure drop, particle bounce and re-entrainment.

• Sampling of atmospheric aerosols for research and environmental monitoring
• Work place aerosol analysis
• Diesel emission analysis and monitoring
• Exposure monitoring
• Industrial hygiene studies

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