Cell Assembly:

The cell assembly consists of a generator electrode at that the titrant/reagent is produced and a counter electrode to done the circuit as in Figure. The generator electrode is a platinum foil or gauze along with a large surface area.

Figure: A typical coulometric titration cell

The products formed at the second electrode normally interfere along with the electrochemical reaction. For instance, the anodic generation of oxidising agents (Ce³⁺ → Ce⁴⁺) is often accompanied through the evolution of hydrogen from the cathode.

This hydrogen reacts along with the oxidising agent and leads to a positive error. Therefore the electrode is isolated from the test solution through a sintered glass disk. Besides, this kind of arrangement helps to maintain 100% efficiency.