General
Refillable

The BR44-BA4 is a Dual-Junction Reference Electrode from the manufacturer Chauvin Arnoux, 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 a silver chloride film (Ag/AgCl). This is immersed in a solution of potassium chloride (KCl 1 mol/l) and potassium nitrate (KNO3), enabling the electrode to perform its reference function. Connection is made via a 4 mm banana plug, intended for attachment to suitable measuring instruments.

Applications

The BR44-BA4 is primarily used in applications requiring high stability of the reference potential, particularly for measuring redox potentials (ORP) and argentometric dosing. It is especially suitable for samples with a high likelihood of deposits or contamination, as the double diaphragm protects the electrode from fouling. The electrode is suitable for use in laboratory and field environments, with an operating temperature range between 0 and 80 °C.

Functions and Equipment in Detail

The electrode features a double diaphragm system, where only one of the two diaphragms comes into direct contact with the sample. The inner tube contains a potassium chloride solution (KCl 1 mol/l), while the outer tube is filled with potassium nitrate (KNO3 1 mol/l). This design effectively protects the reference element from contamination, as KNO3, unlike KCl, does not react with many ions. This expands the electrode’s range of applications and increases its service life. The electrode is refillable, allowing for maintenance and electrolyte replacement.

Technology Explained Simply

The function of the BR44-BA4 is based on the principle of a reference electrode, which provides a constant reference potential to enable the measurement of redox potential or pH value. The Ag/AgCl system forms the reference potential, which remains independent of the solution being measured. The double diaphragm ensures the electrode is not contaminated by the sample being analysed, which is particularly important for complex or aggressive samples. The use of KNO3 in the outer tube prevents reactions with ions from the sample, enhancing the stability and reliability of the measurement.

Compatibility and Accessories

The BR44-BA4 is designed for use with measuring electrodes that operate in combination with a reference electrode. It is equipped with a 4 mm banana plug suitable for connection to appropriate measuring instruments. As an accessory, a Pepsin/HCl solution (125 ml) is offered, which can be used for maintenance or cleaning of the electrode.

Mounting and Installation

Mounting of the BR44-BA4 is achieved by direct connection to the measuring device via the 4 mm banana plug. The electrode is immersed in the solution to be measured, ensuring the tip is fully submerged in the sample. Positioning depends on the application, but the electrode should not be subjected to mechanical stress. Maintenance involves refilling the electrolyte, following the manufacturer’s instructions.

Advantages in Operation

The BR44-BA4 offers high stability of the reference potential, leading to precise and reproducible measurement results. The double diaphragm protects the electrode from contamination and extends its service life. Refillability allows long-term use without replacing the entire electrode. The use of KNO3 in the outer tube expands the range of applications, particularly for samples that could react with KCl. The electrode is suitable for use in laboratory and field environments and can be used in various applications requiring high measurement accuracy.