What is pH?

One of the most widely used water measurements, pH is a measure of acidity and alkalinity, or caustic and base, respectively, of a solution. It is expressed typically on a numeric scale of 0-14. A value of 7 represents neutrality. Lower numbers indicate increasing acidity and higher numbers increasing alkalinity. Each unit of change represents a tenfold change in acidity or alkalinity which corresponds to the negative logarithm of the hydrogen-ion concentration or hydrogen-ion activity.

ph scale

How is pH Measured?

When pH measurements are critical for controlling processes, an electrochemical pH sensor is most commonly used. The sensor is a normally combination type which contains a measuring electrode and reference electrode. The measuring cell detects changes in pH value and the reference provides a stable signal for comparison. A high impedance device known as a pH meter is used to display the millivolt signal as pH units.

Accurate pH Probe

How are pH Measurements Used?

pH measurements are widely used to control processes, ensure product quality or safety.

Common Applications:

  • pH neutralization of effluent in industrial manufacturing environments
  • Cooling towers and boiler control
  • Environmental monitoring
  • Odor scrubbers
  • Food and beverage quality control and safety
  • Upstream protection of filtration membranes
  • Water pre-treatment for manufacturing processes
  • Swimming pool control
  • Pulp and paper manufacturing
  • Pharmaceutical research & development and manufacturing
  • Blood-gas analysis in medical devices

Laboratory pH Sensors

low cost pH Sensor

Process pH Sensors

Differential pH Sensors