E. Settings
Model AQSync Air Quality Monitoring Station Manual Rev. A-1
27
E.
Settings
Settings for the AQSync’s instruments and sensors as well as System settings may be
further adjusted using the Settings menu:
NOTE:
The password for accessing the System Settings menu is “password”. This can
be changed by the user; see Section E.7.10 of this manual.
E.1
NOx Module Settings
The NO
2
/NO/NO
x
instrument in the AQSync
is based on
2B Tech’s Model 405 nm
NO
2
/NO/NO
x
Monitor and many of the
features are the same. For more information
about this measurement, please consult the
website
for
the
Model
405
nm:
https://twobtech.com/model-405-nm-nox-
monitor.html
. The Model 405 nm user
manual is linked at the bottom of that
webpage.
This instrument uses absorption principles and Beer’s Law to measure NO
2
, and
measures NO by conversion to NO
2
. The basics of the
AQSync’s settings for this
instrument are given in this section. In the AQSync, the NOx instrument is set to 5-
second measurements and the measurement mode gives all three measurements:
NO
2
, NO, and NOx. This measurement mode uses three 5-second cycles to measure
I
o
for NO
2
,
I
for NO
2
, which is also
I
o
for NO, and
I
for NO. After each 5-second cycle, a
new measurement of nitrogen dioxide and nitric oxide is computed and output to the
instrument, along with the sum (NOx = NO + NO
2
).
E.1.1
Adaptive Filter
The NO
2
/NO/NO
x
instrument’s firmware processes sample concentration data through
a built-in adaptive filter. During operation, the firmware may automatically switch
