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
8.4.10 Sensitivity coefficient to electrical voltage
The sensitivity coefficient to electrical voltage shall not exceed 0.30 µmol/mol/V (i.e.
0.35 mg/m³/V).
7.2
Test procedure
The sensitivity coefficient of electrical voltage shall be determined at both ends of the speci-
fied voltage range at zero concentration and at a concentration around 70 % to 80 % of the
maximum of the certification range of carbon monoxide. After waiting the time equivalent to
one independent measurement, three individual measurements at each voltage and concen-
tration level shall be recorded.
The voltage dependence in accordance with Standard DIN EN 14626 is calculated from:
)
(
)
(
1
2
1
2
V
V
C
C
b
V
V
v
−
−
=
where
v
b
is the voltage sensitivity coefficient, in µmol/mol/V;
1
V
C
is the average concentration reading of the measurements at voltage V
1
, in
µmol/mol;
2
V
C
is the average concentration reading of the measurements at voltage V
2
, in
µmol/mol;
1
V
is the minimum voltage V
min
in V specified by the manufacturer;
2
V
is the maximum voltage V
max
in V specified by the manufacturer.
For reporting the dependence on voltage, the higher value of the result at zero and span lev-
el shall be taken.
v
b
shall meet the performance criterion specified above.
7.3
Testing
For the purpose of testing the voltage sensitivity coefficient, a transformer was interposed be-
tween the analyser and the voltage supply. Sample gas was fed at various voltages at zero
and span point.
7.4
Evaluation
The following sensitivity coefficients to electrical voltage resulted from the tests:
Table 20:
Sensitivity coefficient to electrical voltage at zero point and at span point
Requirement
≤ 0.3
0.001
0.000
≤ 0.3
0.001
0.001
Device 1
Device 2
Sensitivity coeff. of voltage bv at span level [µmol/mol/V]
Sensitivity coeff. of voltage bv at zero level [µmol/mol/V]
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