TÜV Rheinland Energie und Umwelt GmbH
Luftreinhaltung
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Report on the performance testing of the Serinus 30 ambient air quality
monitoring system manufactured by Ecotech Pty Ltd measuring CO, Report
no.: 936/21221977/D_EN
EP_Ecotech_Serinus30_en.docx
7.1
8.5.4 Long-term drift
The long-term drift at zero shall not exceed 0.50 µmol/mol (i.e. 0.58 mg/m³).
The long-term drift at span level shall not exceed 5 % of the certification range (i.e.
4.3 µmol/mol in a measuring range of 0 to 86 µmol/mol) betragen.
7.2
Test procedure
After each bi-weekly zero and span check, the drift of the analysers under test shall be calcu-
lated at zero and at span following the procedures as given underneath. If the drift compared
to the initial calibration exceeds one of the performance criteria for drift at zero or span level
the “period of unattended operation” equals the number of weeks until the observation of the
infringement, minus two weeks. For further (uncertainty) calculations, the values for “long
term drift” are the values for zero and span drift over the period of unattended operation.
At the beginning of the drift period, five individual measurements are taken immediately after
the calibration at zero and span level (after waiting the time equivalent to one independent
measurement).
The long-term drift is calculated as follows:
)
(
0
,
1
,
,
Z
Z
Z
L
C
C
D
−
=
where
Z
L
D
,
is the drift at zero, in µmol/mol;
0
,
Z
C
is the average concentration of the measurements at zero at the beginning of the
drift period (after the initial calibration), in µmol/mol;
1
,
Z
C
is the average concentration of the measurements at zero at the end of the drift pe-
riod, in µmol/mol.
Z
L
D
,
shall meet the performance criterion as specified above.
100
)
(
1
,
,
0
,
1
,
,
×
−
−
=
S
Z
L
S
S
S
L
C
D
C
C
D
where
S
L
D
,
is the drift at span concentration
c
t
in %;
0
,
S
C
is the average concentration of the measurements at span level at the beginning of
the drift period just after the initial calibration, in µmol/mol
1
,
S
C
is the average concentration of the measurements at span level at the end of the
drift period, in µmol/mol.
S
L
D
,
shall meet the performance criterion as specified above.
7.3
Testing
For the purpose of the test, test gas was applied bi-weekly. Table 27 and Table 28 list the re-
sults of this bi-weekly test gas application.
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