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
Features
· 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
Application
· Study of the hygroscopic growth of aerosols for accurate deliquescence and efflorescence measurements.
· Other aerosol studies by the TDMA method.
Technical Parameters
|
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) |
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.
