The Dust Sentry PM2.5 monitor is designed for long term outdoor monitoring, which gives you access to continuous and real-time particulate data. The Dust Sentry can integrate other sensors for noise, wind, and weather – and logs and reports this data via wired or wireless communications. It suitable for use in applications such as industrial fenceline monitoring, roadside monitoring, and consultancy and research projects.
The instrument uses a well proven near forward light scattering nephelometer and high precision sharp cut cyclone. A sharp cut cyclone ensures highest accuracy because it physically selects for the size fraction being measured. Changing the sharp cut is easy, so the Dust Sentry can also be used to measure PM10, PM1 or TSP. For simultaneous measurement of PM10, PM2.5, PM1 and TSP please see the Dust Profiler.
A nephelometer is an optical sensor that uses light scattering from particulate matter to provide a continuous real-time measurement of airborne particle mass. The light source is a visible laser diode and scattered light is measured in the near forward angle using focusing optics and a photo diode. The nephelometer has an on-board temperature sensor which corrects for thermal drift, sheath air filter to keep the optics clean, automatic baseline drift correction and a fibre optic span system to provide a check of the optical components.
The sharp cut cyclone is a precision engineered component fitted to the Dust Sentry inlet that physically selects particles 2.5 microns and below. This ensures precise measurement of only the PM2.5 size fraction. The inlet is fitted with a heater that is used to remove moisture from the incoming sample. Moisture can reduce the accuracy of optical measurement, so for best results the inlet heater should be activated in the event of high humidity.
The instrument includes an embedded PC, with over 20 years of on board data storage, and two powerful software systems as standard. Aeroqual Connect is the instrument operating software. It opens in your browser so no software needs to be installed or updated. With Aeroqual Cloud you can remotely access data on any device even when your instrument is offline. There are also several options available including: wireless communications, SMS and email notifications and weather sensors. The instrument is packaged in a robust, lockable enclosure and is light enough for one person site installations. Solar shields prevent the enclosure from overheating in climates with high solar irradiance.