Fine Dust Particle Monitor Siemens QSA2700 designed to measure indoor air quality by detecting particulate matter (PM2.5 and PM10) concentrations. This Siemens QSA series includes three different models: QSA2700 – a display-free model with a 3-color LED service indicator. QSA2700D – features an LCD display for real-time monitoring. AQS2700 – serves as a replacement sensor module. All models are designed to measure and transmit PM2.5 and PM10 indoor concentrations and offer MODBUS communication for easy integration into building management systems. These Dust monitors include a built-in proximity sensor that enables an energy-efficient mode: if no activity is detected within approximately 1 meter of the sensor for several minutes, this Particle sensor display turns off while the sensor continues operating and transmitting data. Applications:- Home, Office, IT Parks, Waiting halls, Residentials, etc