Although the ceramic ultrasonic and thermal sensors of Arenal PCS can be applied in any liquid in the world, it is mainly designed for abrasive slurries and pastes, which can be found in Mineral and Metal processing plants, dredging and tunneling. Arenal is actively involved in industrial slurries, like in CMP, pigment and catalysts slurries and battery pastes and potato starch slurries.

The optimal slurry for measuring density, flow and massflow is a homogene turbulent slurry in a pipe or vessel, with a large concentration of particles below 1 mm.

Arenal PCS produces NaOH concentration Analysers for the chemical industry, based on ultrasonic spectroscopy. The sodium hydroxide Analyser consists of the process control Analyser, the ultrasonic transmitter and an ultrasonic sensor. Depending on the application, the sensor can be mounted in the process or in an extractive system. Ultrasonic spectroscopy is the best choice when accuracy is required on a broad range. The acoustic graphs for density and speed of sound gives a continuous increasing signal between 0-50 wt%, but flattens out in the last part. This makes the sensor ideal for use in a broad range and for determining its concentrations on 4 digits over the full range. The materials used are PEEK, SS316 and zirconiumoxide (ZrO2).


Some points of use in the industry

    • Pulp and paper
    • Mining Industry for dissolving aluminium from bauxite ores
    • Etching of alumium
    • Textiles
    • Soaps and detergents
    • Food & Beverages
    • Breweries as CIP cleaner
    • Electronics production as stripper
    • Wet gas scrubbers



Ultrasonic spectroscopy is mainly used for applications in which high accuracy is required. High energy pulses are induced into the piezo element: an ultrasonic wave arises and propagates through the probe: the reflections from the the interface between the element and the liquid, as well as the reflected echo in the liquid are measured. Their properties change due to the temperature and the properties of the liquid. All acoustic properties are calculated in the process control Analyser (PCA). In the PCA the density, SG, concentration and temperature are calculated. Learn more about the technology here.



The preferred embodyment is extractive in QB blocks. A small sample volume is pumped through the teflon blocks.

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