2 GeoPyc
VOLUME CALIBRATION
A calibration run is a series of consolidation cycles performed on Dry Flo plus a reference object of
known properties that is similar to the sample in size, shape, and quantity. The calibration run
calculates a new conversion factor to account for the irregularities of the sample. The result of the
calibration is the Conversion Factor, which is entered as part of the sample information.
SELECT A CALIBRATION OBJECT
The more closely the calibration object(s) approximates the size and shape of the sample being
analyzed, the more accurate the calibration.
Possible calibration objects:
l A reference sample of the sample material.
l A non-porous substitute of similar shape, size, and number as the sample. For example, glass
beads may be used as a calibration substitute for pharmaceutical tablets. Glass rod segments
could be used as a calibration substitute for extruded catalyst rods.
l A fabricated non-porous model of the sample object, especially objects with deadend holes or
through holes.
The presence of large internal cavities or extremes of density reduces accuracy regardless of
whether a calibration run is performed. Accurate analysis cannot be performed on extremely small
sample pieces (less than 1 to 2 mm in diameter).
PERFORM A VOLUME CALIBRATION RUN
1. Place an appropriate amount of Dry Flo in the sample chamber. Do not place the calibration
object in the chamber until prompted.
2. Insert the plunger into the sample chamber and push it part way in. Wipe both ends of the
chamber/plunger free of Dry Flo and debris. Mount the chamber/plunger assembly on the ana-
lyzer.
3. Select the SOP from the drop-down list.
4. Tap Start.
5. The analyzer partially withdraws the plunger.
a. Remove the chamber/plunger assembly from the analyzer.
b. Carefully remove the plunger.
c. Gently tap it on the open chamber so any adhering Dry Flo falls back into the chamber.
Any Dry Flo clinging to the chamber’s edge can be brushed back into the chamber.
d. Set the plunger aside, seal end facing up.
e. Slide the calibration object(s) gently down the side of the chamber.
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GeoPyc 1365 Operator Manual
136-42800-01 (Rev -) — Dec 2016
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