RADIOMETER ABL90 FLEX User Manual

5. Sensors and optical system ABL90 FLEX reference manual
5-14
Background information about the reference electrode
The purpose of the reference electrode is to provide a stable, fixed potential,
against which other potential differences can be measured.
The potential at the reference electrode is not altered by the sample
composition.
A fixed potential is maintained at the reference electrode by the following
equilibrium reactions:
AgCl  Ag
+
+ Cl

Ag
+
+ e

 Ag
These reactions are possible because the electrode is made of an Ag rod coated
with AgCl to provide the Ag/Ag
+
equlibrium in a solution with constant Cl

concentration and to determine the reference potential.
The reference electrode is used in the measurement of pH and electrolyte
concentrations.
Contact with the sample is made via a membrane junction between the
reference electrode liquid chamber and the measuring chamber.
Purpose
Fixed potential
Use

RADIOMETER ABL90 FLEX Specifications

General

Brand	RADIOMETER
Model	ABL90 FLEX
Category	Measuring Instruments
Language	English