Internal and external filters
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Standards
- ISO 10526(Standard illuminants for colorimetry, e.g., D65, A light sources)
- ASTM E1164(Practice for obtaining spectrophotometric data for object-color evaluation)
- MIL-STD-810G(Environmental engineering considerations for military equipment, including filtration)
- IEC 60529(IP ratings for dust/water resistance in external air filters)
- NSF/ANSI 42 & 53(Standards for drinking water treatment filters)
Main Parameters
| Parameter | Internal Filters | External Filters |
|---|
| Application |
Optical instruments, cameras, displays |
HVAC systems, water treatment, light sources |
| Mounting |
Integrated into device housing |
Removable cartridges, cassettes, or frames |
| Spectral Range |
Narrow bands (e.g., UV-cut, IR-pass) |
Broad or customizable (e.g., HEPA, UV sterilization) |
| Lifespan |
500–10,000 hours (dependent on material) |
3–12 months (water/air filters) |
| Maintenance |
Minimal (factory-replaced) |
User-replaceable cartridges |
| Pressure Drop |
Negligible (no airflow restriction) |
Varies (e.g., 0.1–2.0 inches H₂O for air filters) |
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