EZO pH Circuit - Datasheet

Operating principle

A pH (potential of Hydrogen) probe measures the hydrogen ion activity in a liquid.

At the tip of a pH probe is a glass membrane. This glass membrane permits hydrogen

ions from the liquid being measured to defuse into the outer layer of the glass, while

larger ions remain in the solution. The difference in the concentration of hydrogen ions

(outside the probe vs. inside the probe) creates a VERY small current. This current is

proportional to the concentration of hydrogen ions in the liquid being measured.

Base: pH > 7Neutral: pH = 7Acid: pH < 7

Junction 1

Reference wire

Junction 2

Ultem 1000

(shatter resistant)

Silver chloride

Silver wire

EXR advanced sensing glass

KCL reference solution

Ceramic wick