pH, commonly used for water measurements, is a measure of acidity and alkalinity, or the caustic and base present in a given solution. It is generally expressed with a numeric scale ranging from 0-14. The value 7 represents neutrality. The numbers on the scale increase with increasing alkalinity, while the numbers on the scale decrease with increasing acidity. Each unit of change represents a tenfold change in acidity or alkalinity. The pH value is also equal to the negative algorithm of the hydrogen-ion concentration or hydrogen-ion activity.

ph scale

How is pH Measured?

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

Accurate pH Probe

How are pH Measurements Used?

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

Common Applications:

Laboratory pH Sensors

low cost pH Sensor

Process pH Sensors

Differential pH Sensors