B DISPLACEMENT VOLUME
To calculate the envelope density of a sample, the analyzer first determines its envelope volume. A
quantity of Dry Flo is placed in the sample chamber and the medium’s volume is measured (called a
blank run). A sample is then placed in the chamber with the medium, and the volume is measured
again (a sample run). Because Dry Flo does not enter the sample’s pores, the difference between
the two measurements is the displacement volume of the sample including that of its pores (the
envelope volume). The analyzer then uses the envelope volume and the sample’s weight to
calculate its envelope density.
Irregularly shaped samples and multiple samples may be accurately analyzed because Dry Flo
basically conforms to the contours of surfaces. However, no dry-fluid medium can conform to an
object as perfectly as a nonwetting liquid, nor can it respond equally to all types of surface
irregularities. With agitation, however, it does respond reproducibly. The analyzer compensates for
irregularities in the consolidation of the Dry Flo by allowing calibration with an object of known
properties that is similar to the sample in size and shape.
B Displacement Volume
GeoPyc 1365 Operator Manual
136-42800-01 (Rev -) — Dec 2016
B - 1
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