Model Spot Sampler - Aerosol Particle Collector
From Instruments
The Spot Sampler captures fine and ultrafine particles in a concentrated manner for easy, off-line analysis. Its moderated condensational technology enlarges particles without temperature extremes, making it ideal for volatile or biological applications.
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Features
- Centerline saturation ratios reach 1.4 while maintaining temperatures below 25°C.
- Dry sample deposits measure just over 1 mm in diameter.
- High collection efficiency down to
How it Works
Aerosol is sampled through a wet walled tube, the middle section of which is warm
- In the first, Conditioner section, the flow is cooled and humidified.
- In the warm-walled Initiator section, water evaporates from the wet walls faster than the flow warms. The flow becomes supersaturated, initiating the condensational growth of particles >5nm.
- In the final, Moderator section, heat and water vapor are removed from the flow while maintaining supersaturated conditions that allow continued growth to form ~3µm droplets.
- The droplets are collected by impaction, and warmed to make a concentrated, dry spot. Collection into liquid is also possible.
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