Ecotech Serinus 30 - Sensitivity Coefficient to Sample Gas Temperature

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 89 of 253
EP_Ecotech_Serinus30_en.docx
7.1 8.4.8 Sensitivity coefficient to sample gas temperature
The sensitivity coefficient to sample gas temperature shall not exceed
0.3 µmol/mol/K.
7.2 Test procedure
Measurements shall be performed at sample gas temperatures of T
1
= 0 °C and T
2
= 30 °C.
A concentration around 70 % to 80 % of the maximum of the certification range of carbon
monoxide shall be applied. After waiting the time equivalent to one independent measure-
ment, three individual measurements at each temperature are recorded.
The sample gas temperature, measured at the inlet of the analyser, is held constant for at
least 30 min.
The influence of sample gas temperature is calculated from:
)(
)(
1,2,
1,2,
GG
GTGT
gt
TT
CC
b
−
−
=
where
gt
b
is the sample gas temperature sensitivity coefficient, in µmol/mol/K;
1,GT
C
is the average concentration of the measurements at sample gas temperature
T
G,1
, in µmol/mol/K;
2,GT
C
is the average concentration of the measurements at sample gas temperature
T
G,2
, in µmol/mol/K;
1,G
T
is the minimum sample gas temperature T
G,1
in °C;
2,G
T
is the maximum sample gas temperature T
G,2
, in °C.
gt
b
shall meet the performance criterion specified above.
7.3 Testing
The test was performed in accordance with the requirements on testing as stipulated in DIN
EN 14626.
For the purpose of the test, the sample gas mixture was conducted through a bundle of tubes
of 20 m length, which was placed in a climate chamber. The measuring systems were set up
directly in front of this chamber. The end of the bundle of tubes was connected to the meas-
uring systems outside of the climate chamber with the opening being sealed. The test gas
temperature was monitored by means of a thermocouple installed directly in front of the
measuring systems. The temperature in the climate chamber was regulated so that the gas
temperature at the inlets of the analysers was 0 °C. For checking the gas temperature at
30 °C, the gas was not conducted through the bundle of tubes in the climate chamber but
through a tempered heating cable and then fed to the measuring systems.