Micromeritics GEOPYC 1365 - Blank Data; Perform a Stored Blank Data Run

2 GeoPyc
BLANK DATA
GeoPyc >[select a Blank Data SOPfrom the drop-down list]
Ablank run is performed on a quantity of Dry Flo then the sample is added and a second
measurement is done. The volume of the sample is determined from the difference in plunger
positions with and without the sample.
A blank data run may be performed during a sample or calibration run. Blank data can be stored in
advance, however, results may be less accurate.
This method requires extremely careful weighing of Dry Flo and sometimes yields less
accurate data.
Blank data are stored in sets. A group of stored blank runs using the same consolidation force and
number of preparation cycles is called a Stored Blank Data Set.
The analyzer can store 10 blank data sets. For each set, data from up to 10 blank runs can be
included using graduated quantities of Dry Flo. Each set must contain data for at least two quantities
of Dry Flo. The analyzer can then interpolate blank volumes between the data points in the set. The
appropriate interpolated blank run data are used when the sample is run.
PERFORM A STORED BLANK DATA RUN
To store blank run data, begin with an amount of Dry Flo slightly smaller than the smallest amount to
be used during analysis. Perform the blank run. Add a small quantity of Dry Flo, then repeat until the
chamber contains slightly more than the largest amount of Dry Flo to be used.
1. Carefully place a quantity of Dry Flo in the sample chamber and weigh it. Accurate weighing is
critical. See Chamber Diameter on page5 - 6.
2. Insert the plunger into the sample chamber and push it part way in. Mount the chamber/ plun-
ger assembly on the analyzer.
3. Remount the chamber/plunger assembly on the analyzer. Press Start to begin analysis.
The Consolidation Force must have the same value for every run in a Stored Blank
Data Set. The value entered for the first run in a Stored Blank Data Set will appear in
subsequent runs. If changed, a warning displays indicating that this will erase all blank
data stored for this set.
Entering an extremely accurate weight is critical.
4. The analyzer partially withdraws the plunger. Unscrew the plunger from the right mandrel and
push the plunger part way into the chamber. Unscrew the sample chamber from the mandrel.
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GeoPyc 1365 Operator Manual
136-42800-01 (Rev -) — Dec 2016