Sensor contamination fault test

Inspect smoke fire detectors in an environment simulated by Arizona test dust fine particles to represent dust contamination. The airflow velocity around the sample is (0.4±0.1)m/s, and the dust concentration is (100±30)mg/m³ (or the concentration specified by the manufacturer, but not greater than 200mg/m³±30mg/m³). The simulated dust contamination environment is maintained for 1 hour. Then, stop the airflow and apply dust contamination, maintain for 1 hour, during which the condition of the sample is observed and recorded.

Applicable standards：GB4715—2024 Point-type smoke fire detectors
Test range: Smoke fire detectors