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 91 of 253
EP_Ecotech_Serinus30_en.docx
7.1
8.4.9 Sensitivity coefficient to the surrounding temperature
The sensitivity coefficient to the surrounding temperature shall not exceed
0.3 µmol/mol/K.
7.2
Test procedure
The sensitivity of the analyser readings to the surrounding temperature shall be determined
by performing measurements at the following temperatures (within the specifications of the
manufacturer):
1) at the minimum temperature T
min
= 0 °C;
2) at the temperature within the laboratory T
l
= 20 °C;
3) at the maximum temperature T
max
= 30 °C;
For these tests a climate chamber is necessary.
A concentration around 70 % to 80 % of the maximum of the certification range of carbon
monoxide shall be applied. At each temperature setting after waiting the time equivalent to
one independent measurement, three individual measurements at zero and span shall be
recorded.
The sequence of test temperatures is as follows:
T
l
, T
min
, T
l
and T
l
, T
max
, T
l
At the first temperature (T
l
), the analyser shall be adjusted at zero and at span level (70 % to
80 % of the maximum of the certification range). Then three individual measurements are
recorded after waiting the time equivalent to one independent reading at T
l
, T
min
and again at
T
l
. This procedure shall be repeated at the temperature sequence of T
l
, T
max
and at T
l
.
In order to exclude any possible drift due to factors other than temperature, the measure-
ments at T
l
are averaged, which is taken into account in the following formula for calculation
of the sensitivity coefficient for temperature dependence:
0
,
2
1
2
S
S
T
st
T
T
x
x
x
b
−
+
−
=
where
st
b
is the surrounding temperature sensitivity coefficient at zero or span and at zero
or span and at T
min
or T
max
in µmol/mol/K;
T
x
is the average of the measurements at T
min
or T
max
, in µmol/mol;
1
x
is the first average of the measurements at T
1
, in µmol/mol;
2
x
is the second average of the measurements at T
1
, in µmol/mol;
S
T
is the extreme surrounding air temperature in the laboratory, in C°;
0
,
S
T
is the average of the surrounding air temperatures at set point, in C°.
For reporting the surrounding temperature dependence the higher value is taken of the two
calculations of the temperature dependence at T
S,1
and T
S,2
.
st
b
shall comply with the performance criterion as stated above.
Summary of Contents for Serinus 30
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