SAG 420 Dust Generator
Solid Aerosol Generator SAG 420 for aerosol generation from powders, belt dosing, high mass flow rates, best for motor intake filter testing acc. ISO 5011
- under operating conditions easy refillable
- mass flow control by weigh scale option
In applications where air-floating particles are required such as testing of the separation performance of filter media an aerosol with certain, well-defined characteristic features and stability over a period of time is to be used. If the aerosol is produced from a certain powder the characteristic features of the generated dust will be determined by the powder. Additional characteristic features of the aerosol are achieved by transferring the powder into the air-floating state. The process is divided into two parts: the continuous dosing of the powder mass flow and the dispersing (thinning out) of the powder preferably down to the primary particle size of the material.
Standards
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product sheet SAG 420Benefits
- dosing continuity of different dusts over a long period of time
- refill during operation
- mass flow control by weigh scale option
Applications
- charging of filters, filter media and separators with dust
- generation of dust to determine the fractional as well as the total separation efficiency
- visualization of air streams
The dust feeder SAG 420 combines the two processes of dosing and dispersing in one unit and ensures the generation of a well-defined, stable aerosol over a certain period of time.
The operating principle is based on the adjustable and defined addition of fine solids from a holding vessel via a dosing belt to a dispersion nozzle, analogous to directive VDI 3491-3. In the nozzle the fine dispersion is achieved by means of a compressed gas, preferably air.
The solid material is conveyed using a feeding screw and is then captured in a feeding hopper which leads to the dispersion nozzle. The latter operates according to the injector principle. The propellant (compressed air) causes a defined volume flow and the solid material contained in it will be dispersed by the shearing forces of the turbulent gas stream. The generated aerosol is then available at the outlet of the nozzle.
| Parameter title | Unit | Value |
|---|---|---|
| setting parameter 1 | - | dispersion pressure |
| setting range 1 | bar | 1 ... 6 (dispersion pressure) |
| setting resolution 1 | - | continously adjustable |
| setting parameter 2 | - | relative belt velocity |
| setting range 2 | % | 1 ... 100 (relative belt velocity) |
| setting resolution 2 | - | continously adjustable |
| setting parameter 3 | - | relative stirring frequency |
| setting range 3 | % | 0 ... 100 (relative stirring frequency |
| setting resolution 3 | - | continously adjustable |
| aerosol, volumetric flow rate | L/h | 3000 ... 18000 |
| aerosol, mass flow rate (aerosol substance) | g/h | 6 ...12000 (for bulk density of 1 g/cm³) |
| operating medium, aerosol substance | - | powder, powder mixtures (< 200 µm, non-abrasive, non-cohesive, non-toxic) |
| operating medium, aerosol substance - filling volume | mL | ≤ 2000 |
| operating medium, gas/air | - | dry, particle-free compressed air or technical inert gas |
| operating medium, gas/air - compressed air supply | bar | ≤ 8 |
| power supply | - | 110 ... 240 VAC; 50 ... 60 Hz |
| hose connector | mm | Ø 16 (ISO nozzle), Ø 25 (heavy duty nozzle) |
| dimensions (w × h × d) | mm | 150 × 450 × 400 (generator with hopper and nozzle); 295 × 160 × 215 (control unit) |
| weight | kg | 4,7 (generator with hopper and nozzle); 3,8 (control unit) |
- movable rig SVE 430 for dust disperser SAG 420
- tripod holder
- hopper without dispersion nozzle to collect dosed dust – can be attached for weighing the dust and calibrating the device
- weigh option: optional scale available for mass flow control with a precision of 0.2 g/min that ensures exact feed over long periods of time, the generator is mounted on the scale in a vertically adjustable stand with housing
- Electrostatic Aerosol Neutralizer EAN 581 for discharging of the charged test dust
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