sauermann SI-AQ VOC, User Manual

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Page 14 of 42
F. Carbon Monoxide sensor (CO)
This is also a three-electrode sensor that responds to carbon monoxide. It is equipped with an inboard
filter to remove any interference from other acidic gases.
G. Formaldehyde (CH
2
O)
This is also a three-electrode sensor that responds to formaldehyde. It is equipped with an inboard filter
to remove any interference from other acidic gases.
This sensor may have interference from H
2
S, H
2
, CO, and other reducing gases such as alcohols
In applications where the user is measuring both H2S and Formaldehyde, the Formaldehyde readings
could be inaccurate as the levels of H2S increase. Relative measurements could be appropriate in these
situations.
2. NDIR (INFRARED) SENSOR (CO
2
)
A non-dispersive infrared (or NDIR) sensor is a simple spectroscopic device most commonly used to
measure CO
2
in indoor air quality applications. The main components are an infrared source (lamp), a
sample chamber or light tube, a wavelength sample chamber, and the CO
2
gas concentration is
measured electro-optically by its absorption of a specific wavelength in the infrared (IR).
The NDIR options have the following specifications:
GAS RANGE ACCURACY
CARBON DIOXIDE (CO
2
) 0 - 5000 ppm 2% of reading ±10 ppm