3.2.1. Sensor startup
To turn on the sensor, press and hold the button for 5 seconds until the
LED flashes green, and then release the button. The LED will hold yellow
while initializing the bootup sequence then briefly flash red, green, and
blue in sequence to indicate that it is starting normal operating mode. If
no errors or alarms are detected, the LED will begin to indicate current
pollutant concentrations by ‘breathing’ slowly (see Section 3.2.2 below).
The sensor should be allowed to warm up for 30 to 60 minutes before
monitoring pollutants. For every new start up event, a new data file is
created on the SD card (.txt file) and is assigned a filename that contains
the sensor’s ID number and the start-up time/date (Section 3.6.1).
3.2.2. Default LED mode: Pollutant concentration display
When the sensor is operating normally (no errors or warnings), the LED
slowly glows on and off in a ‘breathing’ pattern. By default, the color of
the breathing LED ranges from green to red to indicate the current BC
concentration. Green corresponds to a BC concentration of 0 µg/m
3
, and
red represents concentrations that are higher than or equal to a user
defined maximum setting (factory default is 5µg/m
3
). LED colors are
scaled according to BC concentration between these two limiting values.
For example, yellow corresponds to a BC concentration of 2.5 µg/m
3
with
the default settings. The LED can also be configured to display gaseous
pollutant concentrations. By default, the LED turns off automatically after
20 minutes to conserve battery power, but this delay can be set by the
user. The LED can be turned back on by pressing the button briefly, and
it will breathe to indicate pollutant concentrations for another 20 minute
period. This LED timeout period can also be set by the user. For
instructions on configuring the LED display settings, please see Section
3.8.3.
3.2.3. Sensor menu Interface
To interact with the sensor, press and hold the button. The LED will cycle
through flashes of different colors and patterns that correspond to the
menu items listed in Table 4. When holding the button, the LED cycles
through the menu options in the order listed with two seconds in between
each option. After reaching the desired menu item, release the button, and
the LED will flash the menu item color to confirm the selection. To exit the
menu, press and hold the button through the entire menu selection, the
LED will start breathing normally, and you can release the button.
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