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EPA Protocol Calibration
To determine O
1. Calibrate a stable ozone analyzer with the UV calibration system, assuming no
losses.
2. Generate an O
possible to the actual inlet of the photometer cell.
3. Measure the concentration as close as possible to the outlet of the cell.
4. Repeat each measurement several times to get a reliable average.
5. Measure the concentration at the output manifold. The tests should be repeated
at several different O
The percentage of O
C
m
=
%
O loss
3
where
C
= O
concentration measured at cell inlet, ppm
i
3
C
= O
concentration measured at cell outlet, ppm, and
o
3
C
= O
concentration measured at output manifold, ppm.
m
3
For other configurations, the % O
ozone loss correction factor is calculated as:
L = 1 - 0.01 × % O
8.4.3. Span Drift Check
The first level of data validation should accept or reject monitoring data based upon
routine periodic analyzer checks. It is recommended that results from the Level 1
span checks be used as the first level of data validation. This means up to two
weeks of monitoring data may be invalidated if the span drift for a Level 1 span
check is ≥ 25%. For this reason, it may be desirable to perform Level 1 checks
more often than the minimum recommended frequency of every 2 weeks.
196
loss:
3
concentration, and measure it with the analyzer as close as
3
concentrations.
3
loss is calculated as,
3
+
(
C
C
)
−
i
o
2
×
100
C
m
loss.
3
loss may have to be calculated differently. The
3
Model 400E Ozone Analyzer
Instruction Manual
P/N 04316 Rev: B
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