Ecotech Serinus 30 - Short-Term Drift

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 75 of 253
EP_Ecotech_Serinus30_en.docx
7.1 8.4.4 Short-term drift
The short-term drift at zero shall not exceed 0.10 µmol/mol/12h (i.e.
0.12 mg/m³/12h).
The short-term drift at span level shall not exceed 0.60 µmol/mol/12h (i.e. 0.70
mg/m³/12h).
7.2 Test procedure
After the required stabilisation period, the analyser shall be adjusted at zero and span level
(around 70 % to 80 % of the maximum of the certification range of carbon monoxide). After
waiting the time equivalent to one independent reading, 20 individual measurements are rec-
orded, first at zero and then at span concentration. From these 20 measurements, the aver-
age is calculated for zero and span level.
The analyser shall be kept running under the laboratory conditions while analysing ambient
air. After a period of 12 h, zero and span gas is fed to the analyser. After waiting the time
equivalent to one independent reading, 20 individual measurements are recorded, first at ze-
ro and then at span concentration. The averages for zero and span level shall be calculated.
The short-term drift at zero and span level shall be calculated as follows:
)(
1,2,, ZZZS
CCD −=
where
ZS
D
,
is the 12-hour drift at zero, in µmol/mol;
1,Z
C
is the average concentration of the measurements at zero at the beginning of the
drift period, in µmol/mol;
2,Z
C
is the average concentration of the measurements at zero at the end of the drift pe-
riod, in µmol/mol.
ZS
D
,
shall comply with the performance criterion as specified above.
ZSSSSS
DCCD
,1,2,,
)( −−=
where
SS
D
,
is the 12-hour drift at span level, in µmol/mol;
1,S
C
is the average concentration of the measurements at span level at the beginning of
the drift period, in µmol/mol;
2,S
C
is the average concentration of the measurements at span level at the end of the
drift period, in µmol/mol.
SS
D
,
shall comply with the performance criterion as specified above.