The XRPT1-S7 is a redox combination electrode from the manufacturer Chauvin Arnoux, specifically designed for measuring redox potential (ORP) in liquids. It combines both the measuring electrode made of platinum wire and the reference electrode with a silver/silver chloride system (Ag/AgCl) in a single housing, simplifying handling and increasing measurement accuracy. The housing is made of PVC and designed to withstand mechanical stress in laboratory and field environments. Connection is via an S7 plug, ensuring a secure and screwable connection.

Applications

The electrode is suitable for measurements in various application areas, particularly in process monitoring, water analysis, and the food industry. It is designed for use in liquid media, with a refillable construction enabling long-term use. The operating temperature ranges from 0 to 80 °C, allowing use in a wide range of environments. The electrode is suitable for measurements in small volumes, with a minimum volume of 0.5 mL specified for use in a hemolysis tube.

Functions and Equipment in Detail

The XRPT1-S7 features a liquid electrolyte filled with potassium chloride (KCl) at a concentration of 1 mol/l. This electrolyte is refillable, extending the electrode's lifespan. In case of contamination or wear, the electrolyte can be drained and replaced. The low KCl concentration reduces the risk of crystallization at the membrane, enhancing measurement stability. The diaphragm is made of ceramic, ensuring reliable and uniform diffusion of the electrolyte.

Technology Explained Simply

Redox measurement is performed by detecting the potential difference between the platinum wire measuring electrode and the Ag/AgCl reference electrode. The platinum wire serves as an inert material that does not participate in the chemical reaction but only reflects the potential of the solution. The Ag/AgCl system provides a constant reference potential, serving as a benchmark for comparison. Measurements are taken in millivolts (mV), indicating the oxidation-reduction capability of the solution. The refillable design allows continuous use without frequent electrode replacement.

Compatibility and Accessories

The electrode is equipped with an S7 plug, ensuring a secure connection with compatible measuring devices. Suitable accessories include KCl solution 1 mol/L in 30 mL and pepsin/HCl solution in 125 mL, which can be used for maintenance and calibration of the electrode. These accessories support the functionality and lifespan of the electrode.

Mounting and Installation

Mounting is done via the S7 plug, which is directly inserted into the measuring device and screwed in. The electrode is immersed into the liquid to be measured, with the recommended minimum volume of 0.5 mL to be observed. The cable length is 1 m, providing sufficient reach for most application scenarios. The electrode is not intended for use in semi-solid media, but only for liquid samples.

Advantages in Operation

The combination of measuring and reference electrodes in a single housing reduces the number of required components and simplifies installation. The refillable construction with KCl 1 mol/l extends the lifespan and ensures stable measurements. The PVC housing protects the electrode from mechanical damage, and the S7 plug ensures a reliable electrical connection. The electrode is suitable for use in laboratory and field conditions, with an operating temperature range of 0 to 80 °C enabling broad applicability.