p. timeZone: Time zone in hours relative to GMT. For example, New
York is represented by “-4” (GMT- 4:00). Default is 0.
q. GPS: Optional GPS unit is logging when ‘True’ and powered off
when ‘False’. Default is ‘False’.
r. GPS_samplePeriod: Polling time for GPS to acquire coordinates
in seconds. Factory default is 10 seconds.
3. Factors: This field contains calibration and environmental
compensation factors for each pollutant species monitored onboard
the ObservAir unit. Most factors in this field are for DSTech’s internal
protocols, but those pertinent to the end user are listed below:
a. BC_mref, BC_bref, BC_msig, BC_bsig: Environmental
compensation factors for black carbon measurement. Derived and
uploaded at factory.
b. BC_MAC: Mass absorption coefficient for BC determination (see
Section 1.1.1) in m
2
/g. Default is 7.8 m
2
/g.
c. BC_FLcorrFactor: Filter loading correction factor being applied.
d. FRm: Slope calibration factor for flow rate sensor in ccm/V. Set at
factor.
e. FRb: Intercept calibration factor for flow rate sensor in ccm. Set at
factory.
f. FRcal: Flow rate calibration factor. Default value is 1.0.
g. Gas1: Gas species measured by the first optional gas sensor.
h. Code1: Calibration code for the first optional gas sensor. Each gas
sensing cell has a unique code from the manufacturer (see Section
1.1.2). Unit = nA/ppm.
i. Gas1span: Span calibration factor for first gas cell. Default value
is 1. Must be determined experimentally by user. Unitless.
j. Gas1zero: Zero calibration factor for first gas cell. Default value
is 0. Must be determined experimentally by user. Unit = ppm.
Note 1: If a second gas cell is included in the sensor, a second set of
factors f through i will be written. All factors are the same as the first,
except denoted by the number 2.
Note 2: For an ozone cell, two Codes will be given – One for the ozone
sensitivity (Code2_O3) and the other for nitrogen dioxide
(Code2_NO2). Ozone cells are ALWAYS paired with nitrogen dioxide
cells, and mounted in the second slot (Gas1 = NO2, Gas2 = O3).
4. colNames: Names of the fields logged in the data file as they appear
on each line. For the base unit ObservAir, without gas sensing, the
following column names will be listed
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