MRK-D-0048 V4
Aeroqual Dust Sentry / AQS User Guide
Page | 72
Table 8: Span calibration results
Module
Initial
gain
Initial
a
value
Span
point
Reading
after
stabilisation
10 minute
average
Acceptable
range during
span
calibration
(ppm)
10 minute
average
Maximum
acceptable
noise during
span
calibration
10 min std
deviation
Maximum
Minimum
recommended
gain
New
gain
5
New a
value
3
Ratio of
gain
change
New gain /
Initial gain
Gain
uploade
d
Reading
after gain
changed
Pass /
Fail
8.1.1
8.1.2
8.1.3
8.1.5
8.1.5 (b)
8.1.5 (c)
8.1.5 (d)
8.1.6
8.1.6 (b)
8.1.7
8.1.8
8.1.9
8.1.10
NO
2
1.000
span ± 5 %
2 % of span
NA
NA
Reading after
an
adjustment, (should be
close to 0.000)
O
3
N/A
span ± 5 %
2 % of span
max 5.000
min 0.2
N/A
Ox
N/A
span ± 5 %
2 % of span
max 5.000
min 0.2
N/A
PID
N/A
span ± 5 %
2 % of span
max 5.000
min 0.2
N/A
Comments:
Equation 5: New Gain = Current Gain x (Span concentration / Gas reading)
Equation 3:
a = Ox
reading
/ O
3 span concentration
NOTE:
The Ox module gain adjustment is made during the NO2 calibration gas delivery
The NO2 a value adjustment is made during the Ozone gas delivery
The NO2 gain value is NOT adjusted as part of the calibration process