Quick classification of a Bosch smoke-number reading from 0 (clean) to 10 (black), aligned with typical Tier II/III engine limits.
Formula
$$ \text{FSN = 10 - (Reflectance % / 10)} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $FSN / BSN$ | Bosch / Filter Smoke Number | - | ISO 10054 / in-line smoke meter |
Sources
- ISO 10054 - Measurement of smoke value from compression-ignition engines.