Instruction Manual
Model MicroCEM
Other
c.Paramagnetic O2
The determination of oxygen is based on the measurement of the magnetic sus- ceptibility of the sample gas. Oxygen is strongly paramagnetic, while other com- mon gases are not. The detector used is compact, has fast response and a wide dynamic range. The long life cell is corro- sion resistant, heated and may be easily cleaned. It has rugged
The MicroCEM can employ up to three different measuring methods depending on the configuration chosen. The methods are: NDIR, Paramagnetic O2, Electrochemical O2, and Chemiluminescense.
a.
The
measured. The
An optical bench is employed comprising an infrared light source, two analysis cells (reference and measurement), a chopper wheel to alternate the radiation intensity between the reference and measurement side, and a photometer detector. The detector signal thus alternates between concentration dependent and concentration independent values. The difference between the two is a reliable measure of the concentration of the absorbing gas com- ponent.
Depending on the gas being measured and its concentration, one of two different measuring methods may be used as fol- lows:
Interference Filter Correlation (IFC) Method
With the IFC method the analysis cell is alternately illuminated with filtered infrared concentrated in one of two spectrally separated wavelength ranges. One of these two wavelength bands is chosen to coincide with an absorption band of the sample gas and the other is chosen such that none of the gas constituents expected to be encountered in practice absorbs anywhere within the band.
The spectral transmittance curves of the interference filters used in the MicroCEM analyzer and the spectral absorption of the gases CO and CO2 are shown in Figure
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