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What is the working principle of an ORP meter?

Writer: admin Time:2024-05-16 14:58:09 Browse:203℃

The working principle of an ORP meter is based on measuring the Oxidation Reduction Potential (ORP) of a solution. ORP reflects the macroscopic redox properties of all substances in an aqueous solution. The ORP meter, also known as an Oxidation Reduction Potential sensor, measures the potential of a solution to oxidize or reduce other substances. It is widely used in water quality treatment, hydrological monitoring, wastewater treatment, the chemical industry, biology, and other related fields.


ORP Sensor Measuring Principle:

An ORP sensor adopts the Ion Electrode Measuring Method. Generally, an ORP sensor contains two electrodes: a working electrode and a reference electrode. The working electrode directly contacts the solution being measured and oxidizes it, while the reference electrode is used for comparison and has a known and stable potential. By using the potential of the reference electrode as a reference, the redox properties of the solution can be determined.

When two substances with different redox abilities undergo a redox reaction on the electrode, a potential difference occurs, resulting in the ORP value. This potential difference is detected by the electrode system inside the sensor and then converted into a readable electrical signal output.


Application of ORP Meter:

1. Wastewater treatment

Online digital ORP meters can monitor the oxidation-reduction potential in wastewater in real time, providing key data support for the operation of wastewater treatment plants and ensuring that the discharged water quality meets national and local standards.

2. Swimming Pools

Maintaining the required chlorine levels in swimming pools is important to ensure water quality and safety. ORP meters are used to adjust the disinfectant levels in swimming pools. ORP sensors can monitor the ORP levels and trigger alerts or alarms when the levels are outside the safe range.

3. Aquaculture

pH is an important indicator of water chemistry in aquaculture, used to evaluate the acidity and alkalinity of water bodies. The pH sensor is equipped with built-in temperature compensation, ensuring more accurate measurement results and providing effective temperature protection for fish growth.

4. Food Processing

ORP sensors aid in maintaining the freshness and quality of food products by ensuring proper sanitation levels during production and packaging processes. By accurately measuring the ORP levels in food and beverage solutions, manufacturers can uphold stringent quality standards and regulatory requirements.


In conclusion, ORP sensors are essential tools used to measure the oxidation-reduction potential of solutions. The ORP meters provide accurate and precise measurements that are used in various industries, including water treatment plants, swimming pools, aquaculture, the food industry, and the pharmaceutical industry.

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