The ORP analyzer measures the potential difference of oxidation-reduction reactions in water, reflecting the relative strength of oxidants and reducing agents. It is an important indicator for evaluating the self purification ability, biological activity, and pollution level of water quality. The ORP value is measured in mV, with positive values indicating oxidizing properties (such as chlorine containing disinfectant water) and negative values indicating reducing properties (such as wastewater containing organic pollutants).
Based on electrochemical theory, the properties of the redox system in a solution can be determined by measuring the potential difference of the redox reaction in the solution. It consists of a reference electrode and a working electrode. The potential of the reference electrode is known and stable, such as a silver/silver chloride electrode, while the working electrode is placed in the test solution and receives the potential generated by the oxidation-reduction reaction in the solution. When there is an oxidation-reduction reaction between the working electrode and the reference electrode, a potential difference is generated. This potential difference is measured by a precision electronic measurement system, calculated and processed, and converted into the corresponding ORP value, expressed in millivolts (mV). Positive values indicate that the solution is oxidizing, while negative values indicate that the solution is reducing.
It usually consists of two parts: sensors and secondary meters. The sensor, also known as the electrode part, includes a reference electrode and a working electrode, used to sense redox reactions in a solution and generate a potential difference; Secondary meters are responsible for processing, displaying, and outputting electrical signals transmitted by sensors, and some also have functions such as data storage and alarm settings.
Maintenance and upkeep suggestions
Electrode cleaning: Rinse the electrode surface with deionized water every week to avoid the attachment of pollutants; Soak in dilute hydrochloric acid solution (≤ 1mol/L) every month to remove stubborn dirt.
Storage conditions: When not in use for a long time, soak the electrode in a saturated chloride solution to keep the sensitive membrane moist; The storage temperature should be controlled between 4-30 ℃.
Regular calibration: Use standard buffer solution (such as quinone hydroquinone solution) for calibration daily or weekly to ensure measurement accuracy.
Consumables replacement: Replace electrodes every 6-12 months, inspect and replace sealing rings annually to prevent electrolyte leakage.