pH meter

• Definition of pHmeter

  An instrument used to measure acidity (pH 7) or alkalinity (pH 14) of an aqueous sample
• pH


  • Represents hydrogen ion concentration in pH units
• pH meter components


  • Electrode
  • Electronic circuit
  • Temperature probe
  • Display unit
• pH meter operation


  1. Electrode responds to hydrogen concentration in sample

  2. Produces chemical signal

  3. Glass electrode establishes and measures electrical difference

  4. Electrical potential converted to pH reading
• The glass electrode is made of thin glass that establishes and measures the electrical difference
• The electrical potential is then converted to a pH reading