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Most particles in the atmosphere take up water when exposed to increasing relative humidity – this often explains the poor visibility during the early morning hours when the relative humidity is high and particles have swollen in size and more effectively scatter solar radiation. When we inhale particles they also grow into water droplets, how large they grow determines where they deposit in our respiratory systems. Brechtel developed the first commercial version of the HTDMA. If your work requires real-time particle size and relative humidity dependent water uptake and number size distribution measurements, the HTDMA may be the solution for you.
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Detailed Specs
- Characterized in peer-reviewed literature
- Easily integrated with chemical composition measurement devices
- Years of continuous field deployment
- Backed by over 20 years of HTDMA measurement experience
- DMA polydisperse flow rate: 0.2-2.0 lpm
- DMA sheath flow rate: 2.5-10.0 lpm
- Relative humidity range: 2-93 % RH
- RH control stability at 80% RH (1σ): 0.5% RH
- Time to reset RH set point by 10%: <180 seconds
- Time to reach 93% RH from 2%: <300 seconds
- Time to reach 80% RH from 2%: <300 seconds
- DMA particle diameter sizing range: 0.01-2.0 μm
- CPC particle diameter size range: 0.005-2.0 μm
- CPC counting range: 0.001-10⁵ cm⁻³
- Operating pressure range: 200-1000 mb NOTE¹
- Operating temperature range : 15-35°C
- SEMS footprint size: 48×33 cm
- HSEMS footprint size: 38×58 cm
- Height: 64 cm
- Total weight: 68 kg
- HTDMA instrument power: 240 watts
- Pump power required (@230vac): 650 watts
- Operating voltage: 100-230 VAC
Note 1: Only with SEMS-Exp options
