pH Meter

pH Scale

pH Meter

History The concept of pH was defined in 1909 by S. P. L. Sorensen,

and electrodes were used for pH measurement in the 1920s.

In October 1934 Arnold Orville Beckman registered the first

patent for a complete chemical instrument for the

measurement of pH, U.S. Patent No. 2,058,761, for his

"acidimeter", later renamed the pH meter. Beckman

developed the prototype as an assistant professor of

chemistry at the California Institute of Technology, when

asked to devise a quick and accurate method for measuring

the acidity of lemon juice for the California Fruit Growers

Exchange.

pH Meter

How does the pH

meter work

How does the pH

meter work

The probe

Operating principal of a glass electrode method

pH meter-Calibration and use