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System for maintaining the dispensing capillary at a constant height above the surface

This article describes a system for maintaining the dispensing capillary at a constant height above the surface of the substrate. Used substrates are not sufficiently planar and it is therefore necessary to correct the height of the capillary during dispensing process (constant height with +/- 5 μm tolerance above substrate is necessary). Non-planarity of substrates is typically 150 microns over the entire surface.