pH measurements with separate electrodes require the use of a measurement electrode and a reference electrode. The latter will retain a constant, stable potential during the measurements.

• Calomel (Hg/Hg2Cl2)reference electrode, usually called an SCE (Saturated Calomel Electrode). This comprises a glass tube in which a drop of mercury and mercury chloride (calomel) are placed in contact with a platinum wire. The reference element is filled with a saturated KCl solution (KCl 3 mol/L).
• Equipped with a porous ceramic junction which allows the reference electrolyte to "sweat" but prevents it from flowing freely.
• High stability over time and low temperature coefficient.

This is ideal for many applications except for those where the chloride ions might react with a compound present in the solution, as is the case with Ag+ ions with which the chloride ions form a precipitate, AgCl. In such cases, a mercurous sulphate reference electrode should be used. The choice of the reference electrode depends above all on the experimental conditions for your measurements. This reference electrode should be used with a measurement electrode (BV41A/H or XV41) for correct pH measurement.

• Various connection technologies are available for adaptation to all your instruments.

To fully meet your expectations, a range of accessories is available that is compatible with your equipment. Feel free to add them to your quote request to obtain a complete and tailored solution.