Limit Detection
A metal plate at the end of the probe, within the insulation, and the integrated counter-electrode together the surroundings combine to form the two electrodes of a capacitor. If the probe is covered or free of material, then the capacitance changes and the Minicap switches. Active Build-up . The Minicap detects build-up on the probe and compensates for its effects so that the switch point is accurate. The effects of build-up compensation depend on:
• the thickness of the build-up on the probe,
• conductivity of the material,
• the sensitivity setting on the electronic insert.
Setting the Sensitivity
The Minicap is so calibrated at the factory that it correctly switches in most cases. Greater sensitivity can be set using a multi-pole switch on the electronic insert. This is only necessary, however,if there is very strong build-up on the probe, or if the dielectric constant of the material is very small.
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