Technology: Potentiometric Level Measurement Martin DümlingMany
measurement technologies quickly capitulate when expected to
deal with liquids which are highly adhesive or heavily
contaminated or which generate a lot of foam; this is precisely
where potentiometric measurement technology demonstrates its
full strength. Potentiometric level sensors are ideal for
measuring levels in mobile wastewater containers, during the
manufacture of cosmetic creams or in ceramic slips.
Potentiometric measurement technology takes advantage of the
conductivity of liquids. Consequently, the use of this
technology is limited to liquids with a minimum conductivity of
1 µS/cm. Potentiometric level sensors are an outstanding
alternative to capacitive measurement technology and to probes
based on the principle of guided microwaves in watery liquids.
Essentially, potentiometric measurement technology involves
directing a current through a low-resistance probe tube and
measuring the voltage at the upper and lower ends of the probe
tu