around 1 minute after startup to detect that a filter has been changed, and
the ATN will be automatically reset.
3.3.1. Attenuation reset
Optical attenuation (ATN) represents the filter’s BC loading. By definition,
a clean filter tab (devoid of any BC) has an ATN of exactly 0. However,
since the optical depth of each filter intrinsically varies, the light intensity
transmitted through the active and reference filters on the tab are not
always equal, and the apparent ATN through the clean filter is therefore
not equal to zero, as desired.
The ObservAir automatically detects when the filter tab has been
changed, measures the apparent ATN, and offsets the ATN data by this
value such that ATN = 0 when the filter is clean. If the sensor does not
automatically detect the filter change for any reason, the ATN can be
manually reset through the backend platform the Cloud Dashboard (both
on the app and web browser). The LED will flash green twice to indicate
ATN has been reset.
3.4. Battery charging
3.4.1. Charging Outside of Enclosure
The ObservAir’s internal battery should be recharged using the included
micro-USB cable and 2.1A power adapter. The sensor charges fastest
when it is powered off and connected to the 2.1A power supply: a depleted
battery will fully charge in about 5 hours in this configuration. When the
sensor is off and charging, the LED button shines a solid and turns off
when charging is complete. The sensor can also be plugged into the
charger while it is powered on and operating. The battery will
automatically recharge in this state, but at a lower charging current than
when the sensor is powered off. When in normal operation, the LED button
will briefly flash yellow once to indicate that a charging cable has been
successfully connected. The sensor will also trickle charge while
connected to a computer’s USB port. A DSTech outdoor enclosure can
also charge the ObservAir’s internal battery, when the enclosure is
connected to a 12V power source.
3.4.2. Charging Inside Enclosure
If the instrument is housed in a DSTech active ventilation
enclosure, the instrument will be charged through the enclosure from the
DC barrel jack port. Any 12V source capable of 1A output will be sufficient
to charge the instrument. The enclosure comes with a power adapter, and
optionally, a solar charging kit that plugs directly into the enclosure.
To Next Page
Loading...