
Fluid Operation
Troubleshooting Tips
140 MultiMode SPM Instruction Manual Rev. B
lateral stress. This also forms a fluid-tight seal between the O-ring and sample.
However, some solvents (i.e., nonpolar organic solvents) may dissolve some of the
lubricant into the fluid.
• Substitute an alternative for the O-ring:
• Replace the O-ring with a slice of thin-walled glass, plastic or stainless steel tubing.
• Choose the diameter and thickness of the ring of tubing so that it does not contact
the inner or outer walls of the circular groove in the fluid cell. This allows the
optical head to move laterally during engagement and helps in positioning the tip
over the sample surface.
• Choose the length of the ring of tubing so that it is sufficient to reach the sample
surface and to reach the bottom of the fluid cell before engagement.
• Glue the ring of tubing to the steel sample puck or to the sample to prevent leaks.
• When positioning the fluid cell over the sample surface, adjust the positioning knob at
the base of the optical head to move it slightly forward. This will counter some of the
lateral stress on the O-ring resulting from the optical head moving back during
engagement.
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