3.5. Active Ventilation Enclosure
The Active Ventilation Enclosure is designed to enhance the deployment
capabilities of the instrument, allowing for both indoor and outdoor
operation. This versatile enclosure not only improves performance across
various settings, but also offers additional features that expand the
functionality of the sensor.
By monitoring sensor temperature and regulating temperature changes,
the Active Ventilation Enclosure ensures optimal operation. It employs
insulation as a barrier against dropping temperatures, while utilizing a fan-
driven convection system to cool the sensor when temperatures rise.
The ObservAir sensor is strategically seated within the enclosure at a
slanted angle, which facilitates easy access for swapping filters as needed.
This design consideration ensures efficient maintenance of the
instrument.
Additionally, the enclosure extends the sensor's capabilities by providing
ambient measurements of relative humidity and temperature. Optional
features include the ability to measure PM1.0, PM2.5, PM4, and PM10
through the integration of a PM sensor. This makes the Active Ventilation
Enclosure an essential component for versatile, accurate, and reliable
instrument deployment in a variety of environments.
3.5.1. Enclosure Overview
In Figure 10 below, the outdoor enclosure of the ObservAir is depicted,
displaying a view from the bottom of the instrument. Key features
showcased in this illustration include the 12V barrel jack power input, the
inlet and outlet vents, as well as the specific locations of both the
particulate matter (PM) sensor and the combined relative
humidity/temperature sensor. To maintain optimal instrument
temperature, an internal fan draws air into the enclosure through the
intake vent and expels it via the exhaust vent.
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