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      Burkert Contromatic Limited
      Fluid Control Centre
      1 Bridge End
      Cirencester
      GL7 1QY
      Phone +44 1285 64 87 20
      Fax +44 1285 64 87 21
      E-Mail fnyrf.hx@ohexreg.pbz
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pH measurement

Measuring principle pH value

The hydrogen ion concentration (actually referred to as pH value) in an aqueous solution generates a potential difference at a measuring electrode (pH-sensitive glass diaphragm) with respect to a reference electrode (Ag/AgCl). This voltage is measured by a high-impedance pH measuring instrument and converted to a pH value. The relationship between pH value and voltage is linear, with a slope of 59.16 mV/pH value. The slope is temperature-dependent and is compensated for by an integrated temperature sensor.