The relative dielectric constant (the dk-value) of liquids and bulk solid materials can – next to other influencing factors – be decisive when selecting a suitable technology for level measurement: This is where competent advice is required, but what distinguishes a competent partner? It is competence in product development, experience in the application, correct consultation and reliable service which distinguishes a reliable partner for process control technology. In this booklet, Endress+Hauser endeavours to provide you with a listing of important substances which are commonly used in industry. We realise of course that such a listing is never complete in its scope. If you have the measured dielectric constant value for a product which is not in the book, we ask that you send us this value (the address can be found under the impressum). This will enable us to update the information in the next edition. The reader can look for his product in two ways – either by looking for the trade name or the nomenclature (IUPAC). The dielectric constant values are listed with two separate measurement frequencies: at 1 MHz and at 100 kHz. Please understand the values in the book as standard values for individual measuring processes, as these are not absolute values. Should you find the measured value for your product at another frequency then this frequency can be considered the standard value. The next pages list the following measuring principles: “capacitive level measurement”and “Time Of Flight principles”. The dielectric constant is important for the correct functioning in these measurements. The publisher


Endress & Hauser (2000) Relative dielectric constant εr (dk value)
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