- Sensitivity Class (ASD)
Sensitivity Class is defined in Australian Standard AS 1670.1 to provide a classification system that categorises an aspirating smoke detector (ASD) system based on its smoke obscuration thresholds and maximum allowable transport times, ensuring the system’s performance matches the specific risk profile and environmental conditions of the protected area.
| Sensitivity Class | Performance Level | Primary Purpose | Transport Time (Seconds) |
|---|---|---|---|
| Class A | Very High Sensitivity | Earliest possible intervention in high-airflow environments or critical asset zones (e.g., Data Centres). | 60 s |
| Class B | Enhanced Sensitivity | Reliable detection where smoke is prone to severe dilution or thermal stratification (e.g., Atriums, Warehouses). | 90 s |
| Class C | Normal Sensitivity | Standard fire protection where point detectors are physically impractical to install or maintain (e.g., Voids, Prison Cells). | 120 s |