In the LI-840A version 2.0 and above, the span value is a linear function of absorptance, and
thus has two parameters, a slope and an offset (see Equation Summary on pageB-1). Normal span
setting adjusts the offset and leaves the slope alone. Setting the secondary span adjusts the slope,
then adjusts the offset value for the new slope value. The slope and offset values can be viewed
on the Advanced page. Span offset values (CO
2
Span and H
2
O Span) are typically 1.0 ±0.1). Span
slope values (CO
2
Span 2 and H
2
O Span 2) are typically 0 ±0.1). When they are exactly 0, then
slope is a constant, and not a function of absorptance.
3-27Section 3. Operation
Section 3
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