Ecotech Serinus 30 - Page 83

TÜV Rheinland Energie und Umwelt GmbH
Luftreinhaltung
Report on the performance testing of the Serinus 30 ambient air quality moni-
toring system manufactured by Ecotech Pty Ltd measuring CO, Report no.:
936/21221977/D_EN
Page 83 of 253
EP_Ecotech_Serinus30_en.docx
where
X
z
is the average of the X-values
( )
∑
= nX
i
/(
X
i
is the individual X-value
The function Y
i
= a + B (X
i
– X
z
) is converted to Y
i
= A + B * X
i
through the calculation of A
A = a – B * X
z
The residuals of the averages of the calibration points (including the zero point) are calculat-
ed as follows.
The average value of each calibration point (including the zero point) at one and the same
concentration c is calculated according to:
( )
mYY
c
ica
/)(
∑
=
where
(Y
a
)
c
is the average Y-value at a concentration level c
(Y
i
)
c
is the individual Y-value at a concentration level c
M is the number of repetitions at a concentration level c
The residual of each average (r
c
) at each concentration level is calculated according to:
)()( cBAYr
cac
×+−=
Each residual to a value relative to its own concentration level c is expressed in %:
%100
,
×=
c
r
r
c
relc
7.3 Testing
The test was performed in accordance with the requirements on testing as stipulated in DIN
EN 14626.
7.4 Evaluation
The following linear regressions are obtained:
Figure 10 and Figure 11 graphically summarise the results of the determination of the group
averages for CO.