Brechtel - Model 3100 -Humidified Tandem Differential Mobility Analyzer (HTDMA)
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 Humidified Tandem Differential Mobility Analyzer (HTDMA) so researchers who wanted to explore the complexities of particle water uptake no longer had to build their own instruments, instead they could rely on our 20 plus years of experience with HTDMAs to invest in a solution that would let them focus on their science and not the tool.
With the broadest selectable size range up to 2 microns and controllable humidity between 10 and 93%, the HTDMA uses an auto-scheduler software to continuously run the experiments you want completely unattended.
- Fully automated and field tested
- Comprehensive, easy-to-use software with experiment scheduler module
- Large particle performance: up to 2 microns!
- Rapid RH and particle size changes
- Fast response barrier-free diffusion-based humidifier
- Integrated and automated aerosol generation system (optional)
- Rack mount kit (optional)
- 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%
- Time to reach 93% RH from 2%
- Time to reach 80% RH from 2%
- DMA particle diameter sizing range 0.01-2.0 μm
- CPC particle diameter size range 0.005-2.0 μm
- CPC counting range 0.001-10u cm⁻³
- Operating pressure range 200-1000 mb NOTE¹
- Operating temperature range 15-35°C
- SEMS footprint size 18.9 x 13 in/48x33 cm
- HSEMS footprint size 15 x 22.85 in/38x58 cm
- Height 25.2 in/64 cm
- Total weight 150 lb/68 kg
- HTDMA instrument power 240 watts
- Pump power required (@230vac) 650 watts
- Operating voltage 100-230 VAC
- Aerosol climate impact studies
- Measurement of hygroscopic growth of rapidly evolving aerosol size distributions
- Cloud condensation nucleus studies
- Visibility reduction studies
- Aerosol health impacts
- Long-term climate and air quality monitoring
- Process monitoring
- Tobacco smoke inhalation studies