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 87 of 253
EP_Ecotech_Serinus30_en.docx
7.1
8.4.7 Sensitivity coefficient to sample gas pressure
The sensitivity coefficient to sample gas pressure shall not exceed 0.7 µmol/mol/kPa
(i.e. 0.81 mg/m³/kPa).
7.2
Test procedure
Measurements are taken at a concentration of about 70 % to 80 % of the maximum of the
certification range at an absolute pressure of about (80 kPa ± 0.2) kPa and at an absolute
pressure of about (110 kPa ± 0.2) kPa. At each pressure and after waiting the time equiva-
lent to one independent reading three individual measurements are recorded. From these
three measurements, the averages at each pressure are calculated.
Measurements at different pressures shall be separated by at least four response times.
The sample gas influence is calculated by:
(
)
(
)
1
2
1
2
P
P
C
C
b
P
P
gp
−
−
=
where
gp
b
is the sample gas pressure sensitivity coefficient, in µmol/mol/kPa;
1
P
C
is the average concentration of the measurements at sampling gas pressure P
1
; in
µmol/mol;
2
P
C
is the average concentration of the measurements at sampling gas pressure P
2
; in
µmol/mol;
1
P
is the minimum sampling gas pressure P
1
, in kPa;
2
P
is the maximum sampling gas pressure P
2
, in kPa;
gp
b
shall comply with the performance criterion stated above.
7.3
Testing
The test was performed in accordance with the requirements on testing as stipulated in DIN
EN 14626.
Negative pressure was created by lowering the volume of inserted test gas by restricting the
sampling line. For testing excess pressure, the analyser was connected to a test gas source.
The generated test gas volume was greater than the sample gas volume sucked by the ana-
lysers. The excess gas is discharged via T piece. To generate excess pressure, the bypass
line was restricted. The test gas pressure was determined by a pressure sensor within the
test gas line.
Independent measurements are taken at concentrations of about 70 % to 80 % of the maxi-
mum of the certification range and at pressures of 80 kPa and 110 kPa.
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