B-1
Using the LI-870 CO₂/H₂O Analyzer
Appendix B.
Equations summary
The LI-870 computes CO
2
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 pressure 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
α
' is a span corrected absorptance, and g(
α
',
P
) is the pressure correction.
B-3
S
(
α
) is the span function, and raw absorptance
α
is computed from
B-4
where
V
and
V
o
are the raw detector sample and reference readings, and
Z
is the
zeroing parameter.
Span is a linear function of absorptance.
B-5
Summary of Contents for LI-870
Page 1: ...Using the LI 870 CO2 H2O Analyzer...
Page 2: ......
Page 12: ...Section 1 Overview of the LI 870 1 4 Using the LI 870 CO H O Analyzer...
Page 18: ...Section 2 Using the LI 870 2 6 Using the LI 870 CO H O Analyzer...
Page 30: ...Appendix A Specifications A 2 Using the LI 870 CO H O Analyzer...
Page 41: ......
