General
Refillable

The Chauvin Arnoux BR44-S7 is a Dual-Junction Reference Electrode, specifically designed for redox potential measurements and argentometric dosing. It serves as a reference electrode in systems with separate electrodes, providing a constant and stable potential during measurement. The electrode consists of a glass body containing a silver wire, partially coated with an AgCl film, immersed in a solution of potassium chloride (KCl 1 mol/l) and potassium nitrate (KNO3 1 mol/l). This construction enables precise and reproducible measurement, particularly with samples that are adherent or viscous.

Applications

The BR44-S7 is primarily used in applications requiring high chemical stability and a broad range of use. It is especially suitable for argentometric dosing, where the silver chloride reference electrode provides a stable reference. It is also used in redox potential measurement, for example in the food industry or for monitoring chemical processes. The electrode is suitable for measurements in the laboratory and in the field, and can be used in combination with various measuring electrodes.

Functions and Equipment in Detail

A central feature of the BR44-S7 is the double diaphragm system. Only one of the two diaphragms comes into direct contact with the sample being measured, thereby physically separating the reference element from the external electrolyte. The inner tube contains a KCl solution (1 mol/l), while the outer tube contains a KNO3 solution (1 mol/l). Potassium nitrate, unlike potassium chloride, does not react with many ions, thereby expanding the electrode's range of application. Additionally, the double diaphragm system more effectively protects the reference element if the sample enters the electrode, significantly reducing the risk of contamination.

Technology Explained Simply

The electrode operates on the principle of the silver/silver chloride reference electrode (Ag/AgCl). The Ag/AgCl system provides a stable reference potential that remains independent of the sample composition. The use of two different electrolytes (KCl and KNO3) in the double diaphragm system increases chemical stability and prevents reactions that could cause potential drift. The electrode is equipped with an S7 connector, enabling a secure and screwable connection to compatible measuring devices. The operating temperature ranges from 0 to 80 °C, allowing use in a wide range of environments.

Compatibility and Accessories

The BR44-S7 is designed for use with measuring electrodes also equipped with an S7 connector. Compatible accessories, such as the Pepsin/HCl solution (125 ml), are available and serve for maintenance and cleaning of the electrode. The electrode is refillable, thereby extending its service life and maintaining measurement accuracy over a longer period. The combination with suitable measuring electrodes enables precise determination of redox potential in various applications.

Mounting and Installation

Mounting is done by screwing the S7 connector to the corresponding measuring device. The electrode is immersed into the solution to be measured, ensuring the tip remains fully submerged in the sample. The cable length is 1 m, providing sufficient reach for most application scenarios.

Advantages in Operation

The BR44-S7 offers high chemical stability and a broad range of applications due to the double diaphragm system. The use of KNO3 in the outer tube minimizes reactions with ions in the sample, increasing measurement reliability. The refillable design allows for maintenance and replacement of the electrolyte, extending the electrode's service life. The S7 connector ensures a secure and durable connection to the measuring device, which is particularly advantageous in industrial applications. The electrode is suitable for use in the food industry and can be used in semi-solid media, highlighting its versatility.