Using the LI-8150 Multiplexer
10-87
Chamber Offset
The Chamber Offset is the distance (in cm) between the soil surface and the top of
the soil collar, and is dependent upon the depth that the collar is inserted into the
ground (discussed in Section 2, Initial Setup). The soil CO
2
flux measurement
requires an accurate estimate of the Total System Volume. The LI-8100A software
uses the Chamber Offset and the Soil Area values to calculate the volume of air
inside of the soil collar. This value is, in turn, added to the Chamber Volume,
Multiplex Volume and Extension Tube Volume (if present) to obtain the Total
Volume. Measuring the Chamber Offset is described in Section 2, Using Soil
Collars.
If you measured the Chamber Offset
in inches, remember to multiply by
2.54 to convert the value to cm.
Soil Area
The Soil Area is the surface area of soil encompassed by the soil collar. Select the
20 cm collar; the soil area is calculated automatically and is shown in the window.
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