Ecotech Serinus 30 - Table 10: Repeatability Standard Deviation at Zero and Span Point

TÜV Rheinland Energie und Umwelt GmbH
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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
level of 8.6 µmol/mol CO. According to VDI Guideline 4202 Sheet 1, the test of the repeata-
bility standard deviation at reference point shall be performed using the limit value.
7.4 Evaluation
Table 10 details the test results for the repeatability standard deviation.
Table 10: Repeatability standard deviation at zero and span point
7.5 Assessment
The repeatability standard deviation at zero point is 0.02 µmol/mol for system 1 and 0.02
µmol/mol for system 2. The repeatability standard deviation at span point is 0.03 µmol/mol for
system 1 and 0.00 µmol/mol for system 2.
Does this comply with the performance criterion? yes
7.6 Detailed presentation of test results
Table 11 lists the results of the individual measurements.
Requirement
≤ 0.3
0.02  0.02 
≤ 0.4
0.03  0.00 
0.0801 0.0697
Repeatability standard deviation s
r,z
at zero [µmol/mol]
Repeatability standard deviation s
r,ct
at c
t
[µmol/mol]
Detection limit [µmol/mol]
Device 1
Device 2