The BRPT1-S7 is a redox combination electrode from the manufacturer Chauvin Arnoux, specifically designed for measuring the oxidation-reduction potential (ORP) in liquids. The electrode combines in a single housing the functions of a measuring electrode and a reference electrode, thus being referred to as a single-stem measuring cell. The measuring electrode component consists of a platinum wire, serving as an inert material for redox measurement, while the reference electrode is based on a silver/silver chloride system (Ag/AgCl). The electrode is equipped with an S7 connector, intended for connection to compatible measuring instruments.

Applications
The BRPT1-S7 is suitable for applications where the electron activity of a solution must be detected, for example in water analysis, wastewater treatment, or the food industry. The electrode is designed for measurements in liquids, where redox potential values indicate the oxidation or reduction tendency of the substance. Use in semi-solid media is not specifically recommended, as the electrode is primarily designed for liquid samples.

Functions and Equipment in Detail
The electrode features a refillable liquid electrolyte filling with potassium chloride (KCl) at a concentration of 1 mol/l. This filling allows the electrolyte to be refilled or emptied if contaminated, extending the electrode’s service life. The low KCl concentration reduces the risk of crystallization at the membrane when the liquid evaporates and minimizes the risk of diaphragm contamination. The diaphragm is made of ceramic, ensuring stable and uniform ion conduction.

Technology Explained Simply
Redox measurement is performed by determining the potential difference between the platinum wire measuring electrode and the Ag/AgCl reference electrode. The platinum wire material reacts to the electron activity in the solution, while the reference electrode provides a constant reference potential. The measuring instrument detects the difference in millivolts (mV) and displays it as redox potential. The refillable electrolyte filling ensures a stable electrical connection between the electrode and the sample over a prolonged period.

Compatibility and Accessories
The BRPT1-S7 is equipped with an S7 connector, suitable for connection to measuring instruments supporting this interface. Available accessories include solutions such as KCl 1 mol/L (30 mL) and pepsin/HCl solution (125 mL), which can be used for maintenance or calibration of the electrode.

Mounting and Installation
The electrode is immersed directly into the liquid to be measured. The S7 connector is connected to the corresponding measuring instrument. The electrode is not intended for use in aggressive or highly corrosive media, as the materials (glass, ceramic, platinum) have specific limits regarding temperature and chemical resistance. The operating temperature range is between 0 °C and 80 °C.

Advantages in Operation
The combination of measuring and reference electrodes in a single housing reduces the number of required components and simplifies handling. The refillable electrolyte filling extends service life and enables maintenance that ensures measurement accuracy over a long period. The use of KCl 1 mol/l minimizes the risk of crystallization and contamination, leading to stable and reliable measurements. The electrode is suitable for use in laboratory and field conditions, taking into account the specific requirements of each application.