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pH Electrode

h200

pH electrodes are inherently very sensitive temperamental devices. However bearing in mind that hydrogen ion activity, is measured as a potential across a glass membrane 0.2 mm thick, with a resistance in excess of 20 Megohms, it is hardly surprising.

The decision as to when a pH electrode requires changing has always been a moot point. The life of a pH electrode can vary dramatically, from hours to several years. The oldest one that we know of was 14 years when it finally expired, until then it worked perfectly.

pH Electrodes fail for many reasons, listed below are some examples:

  • Mechanically damaged (cracked glass)
  • Chemically damaged (etched glass)
  • Loss of internal insulation between glass and reference electrodes
  • Mechanically damaged (cracked glass)
  • Mechanically damaged (cracked glass)
  • Mechanically damaged (cracked glass)
  • Mechanically damaged (cracked glass)