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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
Gas filter correlation wheel
The gas filter correlation wheel contains 3 parts, N
2
filled sapphire chamber, CO filled sap-
phire chamber and the mask.
The N
2
chamber allows all the radiation to pass through which allows the radiation to re-
act with CO in the measurement cell and readings to be recorded.
The CO filled chamber absorbs wavelengths sensitive to CO. The sample gas (containing
CO) in the measurement cell does not receive IR radiation and the only detected signals
registered by the IR detector are from background sources and intereferents.
The mask blocks all IR light entering the cell. This allows the intensity of the other two
signals to be determined, compared and calibrated.
Opto-detector
The correlation wheel has four tabs which serve as indicators ensuring that the IR beam is
properly aligned through the correlation wheel.
Measurement cell
The measurement cell contains 5 mirrors which help to generate a path length of 5 metres
through the cell. The sample gas fills the cell and the IR light travels through the sample.
Narrow band-pass filter
The narrow band-pass filter allows only the CO sensitive portion of the IR radiation to pass
through to the IR detector (4.7 µm ) reducing noise and interference.
IR detector
The IR detector is a cooled lead selenide (PbSe) photoconductive IR detector which creates
an electrical signal when wavelengths centred at 4.7 µm reach it
Main controller PCB
The main controller PCB controls all the processes within the instrument. It contains a battery
backed clock, calendar and an on-board microprocessor. The main controller PCB is located
on top of the other components within the analyser. The PBC pivots on hinges to allow ac-
cess to the components underneath.
Pressure sensor board
An absolute-pressure transducer is mounted to the measurement cell, and used to measure
the sample pressure in the cell.
Power supply
The power supply is a self-contained unit housed in a steel case.
It has a selectable input voltage of 115 or 230VAC 50/60 Hz and an output voltage of 12
VDC power for distribution within the analyser.
Summary of Contents for Serinus 30
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