The BR43-BA2 is a reference electrode from the manufacturer Chauvin Arnoux, specifically designed for potentiometry. It serves as a reference electrode for measurements of redox potential (ORP) and pH value, and is used in combination with a separate measuring electrode. The electrode is based on the mercury sulfate system (Hg/Hg₂SO₄) and features a glass body as well as a porous ceramic diaphragm that controls the release of the reference electrolyte, preventing uncontrolled leakage. The reference electrolyte consists of a saturated potassium sulfate solution (K₂SO₄), which ensures a stable and constant reference voltage. The electrode is equipped with a 2 mm banana plug, enabling a compatible connection to measuring devices with the corresponding socket.

Applications
The BR43-BA2 is particularly used in applications where the use of a calomel electrode is not feasible, such as in argentometric dosing. In such cases, Ag⁺ ions can react with chloride ions to form a silver chloride precipitate (AgCl), which would impair the function of a calomel electrode. The mercury sulfate reference electrode is therefore a suitable alternative to ensure reliable redox potential measurement. It is used in combination with measuring electrodes such as BAG1 or XAG1 to achieve precise results.

Functions and Equipment in Detail
The electrode consists of a glass tube containing a drop of mercury and a drop of mercury sulfate (Hg₂SO₄) placed on a platinum wire. This construction ensures a constant reference potential during measurement. The porous ceramic diaphragm allows controlled exchange of the electrolyte with the solution being measured, maintaining stable measurement conditions. The electrode is suitable for use in laboratory and field measurements, especially in applications requiring high chemical stability and reliability.

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 that is independent of changes in the solution being measured. The BR43-BA2 fulfills this function through the mercury sulfate system, which offers high chemical stability. The ceramic connection ensures that the electrolyte diffuses slowly and evenly into the measuring solution, preventing uncontrolled leakage. This is crucial for the accuracy and reproducibility of measurement results.

Compatibility and Accessories
The BR43-BA2 is specifically designed for use with measuring electrodes such as BAG1 or XAG1. It is equipped with a 2 mm banana plug, enabling a direct connection to measuring devices with the corresponding socket. As suitable accessories, a Pepsin/HCl solution (125 ml) is offered, which can be used for maintenance or calibration of electrodes.

Mounting and Installation
The BR43-BA2 is mounted by directly connecting it to the measuring device via the 2 mm banana plug. The electrode is immersed in the solution to be measured, ensuring that the ceramic diaphragm comes into contact with the liquid. It is important to ensure that the electrode is not damaged and that the diaphragm is not clogged. The operating temperature ranges from 0 to 80 °C, enabling use in a wide range of laboratory and industrial applications.

Advantages in Operation
The BR43-BA2 provides a stable and reproducible reference voltage, which is essential for precise measurements of redox potentials and pH values. The use of the mercury sulfate system makes it particularly suitable for applications where Ag⁺ ions are present in the measuring medium. The ceramic connection ensures controlled diffusion of the electrolyte, extending the electrode's lifespan and improving measurement accuracy. The simple handling and compatibility with common measuring devices make it a reliable choice for professional users.