1. Header (first line): The name of the corresponding data file for which
the listed sensor settings apply.
2. Instrument Settings: This field contains information on the sensor’s
configuration and operational settings. Fields are defined below and
appear in the order listed.
a. SN Serial number.
b. user ID: User assigned sensor ID. Factory default is “DSTech OA”
followed by the sensor’s serial number.
c. Version: Software version number.
d. Hardware: Hardware version number.
e. LEDboard: Optical board version number
f. Firmware: Firmware version number.
g. flowRate: Sample flow rate setting in units of ccm. Factory default
is 100 ccm.
h. samplePeriod: The data collection sample rate in seconds.
Factory default setting is 2 seconds.
i. envComp: DSTech’s proprietary environmental compensation
algorithms are active (‘True’) or pollution concentration
measurements are direct from the sensor(s) and uncompensated
(‘False’). Default setting is True.
j. DLPFilter: Digital low pass (DLP) filter is active (‘True’) or turned
off (‘False’). The DLP filter decreases measurement noise but
increases the minimum 90% response time from ~2 to 8 seconds
when monitoring BC concentrations. Gas measurement response
time is minimally affected. Default setting is True.
k. ledDispMode: Pollution concentration data displayed using the
LED button in breathing mode. The LED can also be set to display
only sensor alerts, or be turned off completely. Options are ‘BC’,
‘GAS1’, ‘GAS2’, ’ALERT’, or ‘OFF’. Default setting is ‘BC’.
l. LEDra: Running average, in seconds, applied to the pollution
concentration data displayed using the LED button. Lower running
average values provide higher time resolution but the LED color
display may fluctuate due to sensor noise, while higher running
average values provide a smoother display with lower time
resolution. Default setting is 90 seconds.
m. LEDmaxConc: Maximum concentration setting for the LED display.
Default is 5 µg/m
3
of BC (default ledDispMode setting).
n. LEDtimeout: The time duration, in minutes, before which the LED
display turns off automatically. Default is 20 minutes.
o. maxATN: Maximum optical attenuation (ATN). When filter loading
is above this value, an alarm is triggered. Default is 80.
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