The Humidified Tandem Differential Mobility Analyzer (DMA) system has two differential mobility anal
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The Humidified Tandem Differential Mobility Analyzer (DMA) system has two differential mobility analyzers and a humidification section in between. Aerosol from the ambient atmosphere or from the built-in aerosol generator can be classified by the first DMA to produce a monodisperse aerosol for size analysis by the second DMA to determine the growth in particle size as a function of relative humidity.
Structure
· Built-in Atomizer Aerosol Generator
· Electrical Ionizer
· Differential Mobility Analyzer (DMA)
· Electrical Mobility Spectrometer
· Condensation Particle Counter (CPC)
· Humidity Conditioner
· Data analysis software
特徴
· High stability atomizer aerosol generator
· High accuracy aerosol humidity conditioner
· Wide range, high resolution DMAs
· Patented dual-reservoir CPCs
· DMS and SMS data analysis software
· User friendly user interface with touch screen display
· Automatic data logging
アプリケーション
· Study of the hygroscopic growth of aerosols for accurate deliquescence and efflorescence measurements.
· Other aerosol studies by the TDMA method.
技術パラメータ
| Overall Specifications of the Model 1040XP HTDMA* | |
| Aerosol Generator (Part 1 of system) | 460 mm (H) x 610 mm (D) x 525 mm (W) |
| Part 1/Part 2 Total Weight | 100 lbs (45 kg)/ 140 lbs (60 kg) |
| Power Requirements (Part 1) | 115 or 230 VAC, 50-60 Hz, single phase, 250 W max, 160 W steady |
| Humidity Conditioner/Spectrometer (Part 2) | 460 mm (H) x 610 mm (D) x 525 mm (W) |
| Power Requirements (Part 2) | 100- 240 VAC, 50-60 Hz, single phase, 500 W max, 400 W steady |
| Operating Aerosol Pressure | 800 to 1050 mbar absolute pressure |
| Ambient Temperature Range | 10 to 35 ºC |
| Ambient Humidity Range | 0-90% RH, non-condensing |
| Polydisperse Aerosol Generation System | |
| Single-Jet Atomizer | Stainless Steel Construction |
| Pressure | 5 to 60 psig (5 to 415 kPa gage), controlled by manual pressure regulator |
| Aerosol Flow Rate | Typical 3 L/min @ 35 psig (240 kPa gage) |
| Volume Mean Droplet Diameter | about 2 µm (GSD< 2.0) |
| Aerosol Size Range | 10 to 2000 nm |
| Aerosol Concentration | > 107 particles/cm3 (typical for NaCl) |
| Dryer | Diffusion type (NafionR membrane requires dry comp. air, -20 ºC dew point) |
| Humidity Conditioner | |
| Relative Humidity Control Range | 10 to 93% with user-selected set point in 1% intervals |
| Flow Rate | 1 to 10 L/min |
| RTD and Dew Point Accuracy | ± 0. 2 ºC |
| RH Accuracy | ± 1.5% for chilled mirror sensor; ± 2.5% for capacitive sensor |
| RH control stability | ± 1.2% (typical) |
| Response Time for < 10% ΔRH | < 3 min (typical) |
| Water Reservoir Heater Control | 25 to 50 ºC in 5 ºC intervals |
| Saturator | Nafion® Humidifier with DI water closed loop circulation |
| Dryer | Diffusion type (Drierite® desiccant) |
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