Design and production of the electric conductivity cell

摘要

For measuring the conductivity of fluids a electric conductivity cell has to be used. The cell requires the combination of a ceramic substrate with a metal based coating. The coatings need a good adhesion and a high purity which can withstand a corrosive medium at various temperatures. Typical coatings are copper, silver, gold and platinum. These coatings can be achieved up to 1 mm thickness and with a homogeneous structure by electroplating of electric conductive substrates. The paper describes the design and different possibilities for the metallising of insulating substrates or insulating layers prior to a precious metal coating.