H
2
O Equations
Absorptance α
w
for water vapor is computed from
B-4
where V
w
and V
wo
are the sample and reference raw detector readings and Z
w
is the zero para-
meter. The pressure correction for water vapor is an empirical function g
w
() of absorptance and
pressure P:
B-5
The value of P
o
is 99 kPa. When the pressure correction is not enabled, g
w
() is simply 1.0. Values
for g
w
() can be viewed on the diagnostics window (see Operation on page3-1).
Water vapor concentration W (mmol mol
-1
) is computed from
B-6
where f
w
(x) is a third order polynomial whose coefficients are given on the calibration sheet.
B-7
Appendix B
Appendix B. Equation SummaryB-2
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