A-1Using the LI-830 and LI-850 Gas Analyzers
Appendix A.
Equation Summary
The LI-830 and LI-850 compute CO
2
concentrations using an equation of the form
A-1
where c is concentration, f() is the calibration function, a" is the absorptance, g (a,P)
is the pressure correction, S(a) is the span, and T is the temperature (°C) of the gas
in the cell, typically 51.5 °C. Absorptance is computed from
A-2
a' is a span corrected absorptance, and g(a,P) is the pressure correction.
A-3
S(a) is the span function, and raw absorptance a is computed from
A-4
where V and V
o
are the raw detector sample and reference readings, and Z is the zero-
ing parameter.
Span is a linear function of absorptance.
A-5
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