1. When the filter aperture is set to 1.0, it can eliminate dust more than PM10 (particle size above 10uM), for example, the general sweeping dust, dust raised by the vacuum cleaner.

2. When the filter aperture is set to 1.0-0.7, the effect of water vapor can be eliminated, such as the kettle steam, water vapor generated by the humidifier.

3. When the aperture of the filter is set to 0.7-0.5, it can eliminate the smoke generated by the combustion of the plastic bag.

4. When the filter aperture is set to 0.5, the influence of PM2.5 (particle size below 2.5um) can be eliminated, and the smoke generated from the plastic bag is excluded.

5, filter aperture is set to 0.4-0.3, can eliminate the influence of soot, then still can detect cigarette smoke, so that for cigarette smoke detection, more reliable than the fire alarm.

By analyzing the test data, under the condition that the warning threshold is set to 0.05% obs/m, within 24 hours of the general technical scheme, the PM2.5 is in the case of severe pollution (usually called the burst table) at 400ug-500ug/m3. The number of times reported 106 times, basically in the alarm state, VESDA technical program misreported 24 times, the false alarm duration is short, generally within 10 minutes, and our technical solution is not false positives, but the detection of a concentration of 0.043% obs /m, close to the alarm value, duration 15 seconds, other times smoke is 0.

PM2.5 can achieve a value of 0.800% obs/m when photoelectrically detecting smoke in the severely polluted range, and 0.200% obs/m can also be detected in a good range. Because PM2.5 is highly volatile, according to the meteorological test data, within 1-2 hours, it can be reduced from severe pollution to light pollution. No matter whether it is rising or falling, PM2.5 will fluctuate in a burst. Sexuality, through electronic filter technology, can be truly true without false alarms at ultra-high sensitivity. With the decrease of sensitivity, there is no possibility of false positives. For example, the sensitivity is 0.02% obs/m-0.05% obs/m, which is basically not false alarms. It can completely meet the needs of extremely early fire alarms in domestic high-pollution environments and can eliminate Dust and water vapor influence.