Chauvin Arnoux XR42-BA2 XR42 pH and redox reference electrode / 2 mm plug content_copy

The XR42-BA2 is a calomel reference electrode from the manufacturer Chauvin Arnoux, specifically designed for pH and redox measurements. It serves as a reference electrode in conjunction with separate measuring electrodes and ensures a constant and stable reference potential, which is necessary for precise measurement value formation. The electrode features a robust body made of PVC, which protects the sensitive reference element, and is equipped with a ceramic diaphragm that enables controlled exchange of the reference electrolyte. Connection is made via a 2 mm banana plug, ensuring a secure connection with compatible measuring devices. The electrode is suitable for use in laboratories and in the field, and is particularly suited for applications requiring high long-term stability and a low temperature coefficient.

Applications
The XR42-BA2 is used in applications where a separate measuring electrode and a reference electrode are employed, such as in educational instruction or in measurements where the service life of the electrodes differs. It is suitable for pH measurements in the range of 0 to 14 pH units and can also be used for redox measurements (ORP). The electrode is suitable for use in solutions where no reactions occur between chloride ions and components of the measuring solution, such as silver ions, as this could lead to AgCl precipitation and impair functionality.

Functions and Equipment in Detail
The reference electrode is based on the calomel system (Hg/Hg₂Cl₂) and is filled with a saturated KCl solution (3 mol/l), which serves as the reference electrolyte. The reference element consists of a drop of mercury and a drop of mercury chloride (calomel), placed on a platinum wire. The ceramic diaphragm ensures controlled diffusion of the electrolyte and prevents direct mixing with the measuring solution. The electrode is refillable, allowing for maintenance and replacement of the electrolyte. The operating temperature range is between 0 °C and 60 °C.

Technology Explained Simply
In pH measurement, the potential difference between the measuring electrode (which reacts to hydronium ions) and the reference electrode (which provides a constant potential) is recorded. The measuring device converts this difference into a pH value. The XR42-BA2 provides the stable reference potential, which is independent of the measuring solution. The use of a PVC body increases mechanical robustness, while the ceramic diaphragm enables uniform diffusion of the electrolyte. Calomel technology is known for its long-term stability and low temperature dependence, which enhances the reliability of measurement results.

Compatibility and Accessories
The XR42-BA2 is to be used in combination with measuring electrodes such as BV41H or XV41H. Suitable accessories include the KCL 3mol/L solution (30 mL) and the Pepsin/HCl solution (125 mL), which are suitable for maintenance and calibration of the electrode. The electrode is designed for measurements in laboratory and field conditions and is particularly suitable for applications requiring high stability and low temperature dependence.

Installation and Mounting
Installation is performed by connecting the 2 mm banana plug to the corresponding terminal on the measuring device. The electrode is immersed in the measuring solution, ensuring that the ceramic diaphragm comes into contact with the solution. Maintenance includes refilling the reference electrolyte, for which the appropriate KCl solution is used. The electrode is not suitable for use in solutions containing silver ions, as this could lead to a reaction with chloride ions.

Operational Advantages
The XR42-BA2 offers high long-term stability and a low temperature coefficient, resulting in reliable and reproducible measurement results. The robust PVC housing protects the sensitive reference element, and the ceramic diaphragm ensures uniform diffusion of the electrolyte. The refillable design allows for extended service life and reduces the need for replacement. The electrode is suitable for use in laboratory and field conditions and is particularly suited for applications requiring a clear separation between measuring electrode and reference electrode.

General
Refillable

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