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Teledyne API – Model T300/T300M CO Analyzer Theory of Operation
301
IR unaffected by N
2
in Measurement Cell of
the GDC Wheel and no additional CO in the
Sample Chamber
IR affected by CO in Reference Cell
with no interfering gas in the
Sample Chamber
IR shinning through Measurement Cell of
the GDC Wheel is reduced by additional CO
in the Sample Chamber
IR shining through Reference Cell is
also reduced by additional CO in the
Sample Chamber, but to a lesser extent
M/R
is reduced
CO REF
CO MEAS
Figure 13-4: Affect of CO in the Sample on CO MEAS & CO REF
Once the T300/T300M has computed this ratio, a look-up table is used, with
interpolation, to linearize the response of the instrument. This linearized concentration
value is combined with calibration SLOPE and OFFSET values to produce the CO
concentration which is then normalized for changes in sample pressure.
06864B DCN6314