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Bare, non-insulated probe calculations are simple and straightforward mathematical functions. Graphs (curves) for bare probes are unnecessary, since the “curve” is a straight line. The table below shows the picofarads per foot for various probes in differing vessel diameters. All values given are for that given probe in that given vessel with AIR surrounding the sensing probe. To determine the pF/ft. for a probe in a given vessel size, multiply the listed value below by the dielectric value of the product being measured. This resultant value is for that probe and vessel with that product per foot of covered probe. For total capacitance values, remember to add the probe terminal capacitance value (in the definitions section) to the above obtained figure.
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