ORP Meter: An Essential Tool for Monitoring and Controlling Oxidation-Reduction Potential in Wastewater Treatment

Oxidation-Reduction Potential, namely ORP, reflects the difference in the oxidation-reduction potential between the indicating electrode and the reference electrode in a liquid, and it can provide a comprehensive assessment of the oxidation-reduction state of the entire system. In a wastewater treatment system, a low ORP value indicates a high content of reducing substances or organic pollutants in the system, a low dissolved oxygen concentration, and a reducing environment. On the other hand, a high ORP value indicates a low concentration of organic pollutants in the wastewater, a high content of dissolved oxygen or oxidizing substances, and a dominant oxidizing environment.

In the past, oxidation-reduction water treatment technology was not precise enough in terms of control conditions, which not only wasted chemicals but also was unfriendly to the environment. Nowadays, with the help of ORP measuring instruments, using the ORP electrical signal as the basis for detection and control can significantly improve the control accuracy of oxidation-reduction water treatment technology, thereby enhancing the treatment effect. The detection principle of ORP is similar to that of pH detection. Many online pH detection instruments are equipped with dual channels, and one of them includes the ORP detection channel.

ORP is crucial for the automatic control of sewage treatment plants and precise anaerobic control. It can not only save energy, regulate the metabolic pathways of anaerobic microorganisms but also improve the treatment effect. Initially, oxidation-reduction potential was mainly used in the treatment of industrial wastewater, especially the wastewater generated from metal finishing, and later it was also widely applied in municipal sewage treatment plants.

There are various variable valence ions and dissolved oxygen in the sewage system, forming multiple oxidation-reduction electrode pairs. Through an ORP Meter, the oxidation-reduction potential of the sewage can be quickly detected without the need for sampling and measurement in a laboratory, which greatly shortens the laboratory process and improves work efficiency. In the sewage treatment process, the biodegradation of organic pollutants containing carbon, nitrogen, phosphorus, etc., the hydrolysis and acidification of organic substances, nitrification and denitrification reactions, as well as biological anaerobic phosphorus release and aerobic phosphorus uptake, are all extremely important oxidation-reduction reactions.

The ORP online analyzer (model FT-ZOR1) is an instrument used for real-time monitoring of the oxidation-reduction potential (ORP) of water bodies, which is widely applied in fields such as water treatment, environmental protection, industrial production, and scientific research.

It can continuously and real-timely monitor the oxidation-reduction potential in water bodies and provide immediate data feedback. Users can view and analyze real-time and historical data through the display screen or computer software.

The following is its detailed introduction.

Size Specifications:

Instrument shape size: 96×96×110mm

Cutout size: 92×92mm

Power Consumption and Power Supply:

Power consumption: DC24V≤1.6w; AC220V≤15w

Power supply voltage: DC24V/AC220V (optional before leaving the factory)

Protection and Weight:

Protection level: IP54

Instrument weight: Controller ≤ 0.6kg

Working Conditions:

Ambient temperature: -20～60℃

Relative humidity: <85%

Appearance Display:

128×64 dot matrix liquid crystal display, with operation buttons attached

Display content: Current date, time, measured value, current measured temperature, output current value

Function Modes: Turbidity, dissolved oxygen saturation, dissolved oxygen concentration, ammonia nitrogen, COD and other measurement modes can be selected through buttons

Time and Data:

Built-in clock chip to display the current time

Built-in storage chip to save historical data of the past three days

Anti-interference and Communication:

Adopt the latest devices with high impedance; the current output is photoelectrically coupled and isolated, with strong anti-interference ability and good electromagnetic compatibility

Communication interface: RS485 and 4-20ma two signals are output simultaneously

Other Features:

Industrial control watchdog to prevent freezing

By default, it comes with two relay outputs (high-point and low-point alarm, low-point alarm relay), and the alarm value, suction value, and disconnection value can be set, with a load capacity of AC220V, 3A

The zero-point range and full-point range corresponding to the device current output can be set

The device buttons have password protection to prevent parameter tampering

The backlight can be set to be always on or turn off when there is no operation (power-saving mode)

The buzzer can be manually turned on and off

The time, current temperature, and real-time water quality value can be calibrated through buttons