Soiling and Abrasion in Photovoltaics Test System
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Standard
VDI 3956-1
Technical data
| Parameter | Unit | Value |
|---|---|---|
| Air flow velocity | m/s | ≤ 15 |
| Test specimen dimensions | mm | Thickness ≤ 10 |
| Specimen holder | – | Base area 200 × 200 mm; setting angle 0 … 60° (discrete) |
| Test conditions | – | Environmental temperature and relative humidity (controlled) |
| Compressed air supply (operating gas/air) | bar | 6 … 10 (quality class ISO 8573-1:2010 [6:4:2]) |
| Power supply | – | 3 – TN-C-S network/PEN; 400 VAC, 50 Hz |
| Test chamber dimensions | mm | 700 × 720 × 700 |
| Aerosol generation technology | – | Dust disperser SAG 410 |
| Power consumption | W | max. 6000 |
| Noise emission | dB(A) | LpA ≤ 76.7 ± 1.5 |
| Dimensions (W × H × D) | mm | 2107 × 890 × 1647 |
| Weight | kg | approx. 450 (including devices) |
Features
adjustable angle of the sample holder
selectable dust dosing positions
data logger
largely automated processes
optimised handling
Principle
The test specimen is mounted on a sample holder in an air lock and then drawn into the preconditioned main chamber. The air lock prevents the dust-containing atmosphere from entering the environment. The desired angle of the specimen is set (up to 60° to the horizontal). The environmental scenarios to be investigated are imitated using the following equipment:
- dusting using generator with dual-positionable nozzle
- temperature control of sample holder: with heating mat/cooling unit
- blowing off the sample using a movable air blade
When air is introduced into the chamber by dust dosing, humidification or sample cleaning, a negative pressure must be present in the chamber to prevent the emission of dust into the atmosphere.
Maintenance Information
Regularly clean the dust generator and chamber interior to ensure consistent test conditions.
Check seals and air-lock components to maintain negative pressure integrity.
Verify airflow velocity, temperature, and humidity sensors periodically.
Inspect compressed air quality to comply with ISO 8573-1 requirements.
Perform routine system calibration according to laboratory quality procedures.
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