Spanning CO
2
When the command for setting the CO
2
span is received, along with the target con-
centration C
T
, the instrument computes S
c0
from equation A-28, where and
are averaged for 5 seconds.
A-27
A-28
where
A-29
Note that
A-30
We need
α
cT to compute , but
α
cT depends on . We resolve this by
using an approximation (equation A-31) instead when computing equation A-30
A-31
The instrument retains the following values, which are used for subsequent sec-
ondary spans, if necessary:
A-32
A-33
Secondary Span CO
2
When the secondary span command for CO
2
is received, the instrument computes
new values for both S
c0
and S
c1
. First, it measures a new and computes a new β
c
Appendix A. Equation Summary
A-7Appendix A. Equation Summary
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