Analog Particulate Matter Sensor

Description

Datasheet

The sensor can detect particle pollution with a size of 2.5um or smaller. The device is suitable for ceiling or wall mount applications. Place the sensor in a location where pollution is critical close to sensitive equipment or at-risk persons.

The sensitivity can be adjusted with a simple jumper position. This selection changes the gain of an analog amplifier. Choose a gain suitable for typical range of pollution. A high gain will detect a lower more critical range. Whereas a lower gain will observe a broad range in highly polluted airspace.

The output mode can be changed from a continuously varying analog signal to a digital signal. The digital signal is produced by a comparator with a threshold at half scale (i.e. 5V) or quarter scale (i.e. 2.5V). Use the analog mode to continuously monitor pollution level. Or use the digital mode to trigger actuators at a specific pollution threshold.

Changing the sensitivity and choosing the digital output scale can adjust the pollution threshold. Setting sensitivity high and digital scale low will reduce the pollution threshold to a minimum and detect good to moderate pollution levels. Whereas, setting sensitivity low and digital scale high will increase the threshold to a maximum and detect only hazardous pollution.