Reference separate electrode XR43 - S7- CHAUVIN ARNOUX

pH measurements with separate electrodes require the combination of a measuring electrode and a reference electrode. The latter will maintain a constant and stable potential during the measurements.

- XR43 electrode consists of a glass tube in which a drop of mercury and mercurous chloride (calomel) is placed in contact with a platinum wire. The reference element is filled with a saturated KCl solution (3 mol/L KCl).

It is suitable for many applications except those where chloride ions may react with a compound present in the solution, such as with Ag+ ions where chloride ions form a precipitate, AgCl. In such cases, a reference electrode with mercurous sulfate is preferably used.