Ionode IJ pH V5.1 Manual do Utilizador descarregar pdf (Página 7)

Ionode IJ Instruction Manual 7

4.2. Electrode Characteristics

4.2.1. Construction

A pH electrode consists of two electrochemical

half-cells usually co-axially combined into a

single housing called a “combination electrode”

to form an electrical circuit. The sensing half-

cell comprises a pH sensitive glass membrane

attached to a sealed insulating tube containing

a solution of fixed pH in contact with a silver-

silver chloride element. A voltage proportional

to pH is measured between the sensing half-

cell and a reference half-cell which ideally

maintains a stable potential independent of the

sample.

V

Figure 6

Sample

Internal Filling

Solution

Primary Reference

Electrolyte

Sleeve Electrolyte

(renewable)

Porous Wick

Primary Reference

pH Membrane

Ground Surface

Intermediate

Junction (secondary

reference

electrolyte)

Ag/AgCl Elements

pH Meter

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