TA Instruments AR 2000 User Manual

AR 2000 Operator's Manual
116
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.
Figure 9.4: Procedure to Identify Interface Position
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.
Figure 9.5
Graph to Identify the Interface Position

TA Instruments AR 2000 Specifications

General

Brand	TA Instruments
Model	AR 2000
Category	Measuring Instruments
Language	English