Jumo has now developed an electrode especially for applications in heavily polluted media, emulsions, dispersions, or for use in media containing proteins and sulfides, as an alternative to electrodes incorporating a ceramic or PTFE diaphragm, also for heavily contaminated municipal or industrial wastewater. The electrodes use a polymer-based solid electrolyte. In addition, they feature an annular gap diaphragm that is characterized by a high degree of immunity to interference. The annular gap construction and use of a solid electrolyte ensure that the diaphragm cannot become clogged. The measurement remains stable over a lengthy period, even in heavily polluted media. For application in general aqueous solutions, pH sensors with gel filling and ceramic diaphragm can continue to be used.
As a result of the direct contact between the electrolyte and the medium, an increased thinning effect has to be expected in such media with solid-electrolyte electrodes, which would considerably reduce the operational life of the electrode. The solid electrolyte is free from silver chloride, which makes it insensitive to sulfide ions. The U glass permits operation at temperatures ranging from -5 to +80 °C. The electrode withstands pressures up to 6 bar.
Hall 9, Booth F05
cpp 445
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