LI-COR LI-840A - Equation Summary

Appendix B. Equation Summary
The LI-840A computes CO
2
and H
2
O concentrations using an equation of the form
B-1
where c is concentration, f() is the calibration function, α is the absorptance, g (α,P) is the pres-
sure correction, S(α) is the span, and T is the temperature (°C) of the gas in the cell, typically
51.5 °C. Absorptance is computed from
B-2
where V and V
o
are the raw detector sample and reference readings, and Z is the zeroing para-
meter.
Span is a linear function of absorptance.
B-3
Appendix B. Equation Summary B-1