Fabrication of electrodes for electromagnetic flowmeter - uses powdery or fibrous particles of conductive substance embedded in insulating lining

摘要

The electrodes obtain the measuring voltage, or are used for earthing. They are in contact with the liquid medium flowing through the tubular measured value generator. The tube has on its inner surface an insulating lining. The electrodes consist of powdery or fibrous particles of a conductive substance, embedded into the insulating lining in the electrode zone(s). The particles are of carbon, graphite, or metal. The electrode structure may incorporate a metal mesh coupled to the current conductor. The measuring electrodes, to which the measuring voltage is applied, may be arranged on diametrically opposite sides of the tube. An electrode plate may be secured to each measuring electrode by a dielectric adhesive. Annular electrodes at the tube ends may form earthing rings.