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Finding the Interface Position
Use the following procedure to find the interface position:
1.
Raise the instrument head to the backoff distance then lift and fix the lid.
2.
Fill the cup to the half full mark with the more dense of the sample fluids.
3.
Set a gap of 24000 µm and lower the lid.
4.
Ensure that the "Zero normal force before run" box is checked under Options/Experiment/Pre-experiment.
5.
Use a squeeze test similar to that shown below in Figure 9.4. This can be set up using Procedure/New/Flow.
6.
Plot the results as normal force versus gap. When the geometry is at the interface, the normal force passes
through zero. To establish this point, the graph grid and cursors can be used, as shown in Figure 9.5.
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Figure 9.4: Procedure to Identify Interface Position
Figure 9.5
Graph to Identify the Interface Position
AR 2000 Operator's Manual
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