Concentration and Flow Measurement of Caustic Soda One of the products of the chlorine-alkaline electrolysis is a watery Sodium Hydroxide (NaOH) solution. Normally this diluted solution is condensed in a multi-stage distillation process to a commercial concentration of 50%. In order to ensure the specified quality / concentration is maintained at all times, is has to be measured continuously. Conventionally used Coriolis meters are subject to enormous wear and tear by the aggressive medium and are thus prone to measurement drift making frequent recalibrations necessary. Moreover, in case of a meter failure, its replacement is very costly as a shutdown of operation for several days is required in order to shut off and empty the pipeline. Non-invasive measurement with the PIOX S clamp-on ult

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