The BR43-BA4 from Chauvin Arnoux is a reference electrode with a mercury sulfate reference system, specifically designed for potentiometry in chemical measurement applications. It serves as a reference electrode for measuring redox potential (ORP) and pH value, and is used in combination with a separate measuring electrode. The electrode features a glass body and a porous ceramic diaphragm that controls the release of the reference electrolyte, preventing uncontrolled leakage. The reference system is based on mercury/mercury sulfate (Hg/Hg₂SO₄), with the electrolyte being a saturated potassium sulfate solution (K₂SO₄). The electrode is equipped with a 4 mm banana plug, enabling a secure electrical connection to measuring instruments.

Applications

The BR43-BA4 is particularly used in argentometric dosing applications, where the use of a calomel electrode is not possible due to the reaction of silver ions (Ag⁺) with chloride ions (Cl⁻) forming a silver chloride precipitate (AgCl). In such cases, the mercury sulfate reference electrode provides a stable and constant reference potential, which is essential for precise measurements. It is therefore suitable for laboratory and process environments where specific chemical conditions influence the choice of reference electrode.

Functions and Equipment in Detail

The electrode consists of a glass tube containing a drop of mercury and a drop of mercury sulfate placed on a platinum wire. This system ensures a constant potential that serves as a reference for measurement. The ceramic diaphragm acts as a selective diffusion barrier, allowing contact between the reference electrolyte and the solution being measured without losing the electrolyte. The use of a 4 mm banana plug enables universal connection to devices supporting this connector.

Technology Explained Simply

When measuring pH values or redox potentials, the potential difference between the measuring electrode and the reference electrode is recorded. The reference electrode provides a constant comparison potential, ensuring measurement accuracy. The BR43-BA4 is designed for this purpose by offering a stable Hg/Hg₂SO₄ system that is resistant to silver ions. The saturated potassium sulfate solution as the reference electrolyte ensures high stability and reproducibility of measurement results. The ceramic diaphragm prevents electrolyte leakage while enabling controlled diffusion.

Compatibility and Accessories

The BR43-BA4 is intended for use with measuring electrodes such as BAG1 or XAG1 to ensure accurate redox measurements. As an accessory, a Pepsin/HCl solution (125 ml) is offered, which may be suitable for electrode maintenance or calibration.

Mounting and Installation

The electrode is immersed directly into the solution to be measured, with the 4 mm banana plug connected to the measuring device. Installation requires no additional tools or components. The ceramic connection ensures secure diffusion of the electrolyte without requiring additional sealing measures.

Operational Advantages

The BR43-BA4 offers high stability of the reference potential, especially in applications where silver ions are present in the medium. The use of a 4 mm banana plug ensures universal compatibility with various measuring instruments. The ceramic diaphragm ensures long service life and prevents uncontrolled electrolyte leakage. The electrode is therefore suitable for precise and reliable measurements in chemical processes, particularly in argentometric dosing.