Suzhou Delfino Environmental Technology Co., Ltd.
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The full English name of ORP is oxidation-reduction potential. It is the difference between the oxidation-reduction potential of the indicator electrode and the oxidation-reduction potential of the comparison electrode in the liquid. It can give a comprehensive indicator of the oxidation-reduction status of the entire system. If the ORP value is low, it indicates that the content of reducing substances or organic pollutants in the wastewater treatment system is high, the concentration of dissolved oxygen is low, and the reducing environment is dominant.
How to measure the ORP value in water quality? We usually use online ORP Probe sensors to monitor the ORP value in water. The measurement principle of the ORP electrode is based on the potential change of the redox reaction. According to the nernst equation, there is a linear relationship between the potential difference and the concentration of the redox reaction. By comparing the measured potential difference with the standard potential of a known redox reaction, the intensity and direction of the redox reaction in the solution to be measured can be determined. In sewage treatment plants, monitoring of ORP values is very important. There are a variety of variable ions and dissolved oxygen in the sewage system, that is, multiple redox couples. Through the ORP online monitoring instrument, the oxidation-reduction potential in sewage can be detected in a very short time, without the need for sampling and measurement in the laboratory, which can greatly shorten the laboratory process and improve work efficiency.
Features
Online ORP composite probe uses high-purity platinum detection head, has strong acid and alkali resistance and anti-oxidation ability
Specification
| Model | ASR400V | |
| Measuring Range | -1500~1500mV | |
| Indicating electrode | platinum | |
| Reference System | Ag/AgCl reference electrode, double salt bridge, KCL gel | |
| Electrode Material | PPS+PTFE+platinum | |
| Zero(E0) | ±20mV | |
| slope(SLOP)% | ＞95% | |
| flow rate | 0.5m/s≥flow rate≥0.001m/s | |
| Working Pressure | 0~6bar | |
| Working Temperature | 0~100℃ continuously work | |
| Thread Size | 1-inch NPT thread | |
| Dimension | Diameter: 35mm Length: 200 mm | |
In sewage treatment, you need to pay attention to the following issues so that you can use ORP electrodes to more accurately measure the ORP value of sewage.
1. In each stage of sewage treatment, the redox potential required by microorganisms is different.
Generally, aerobic microorganisms can grow above +100mV, and the optimum temperature is +300~+400mV; facultative anaerobic microorganisms perform aerobic respiration when above +100mV, and perform anaerobic respiration below +100mV; obligate anaerobes Bacterial requirements are -200~-250mV, among which obligate anaerobic methanogens require -300~-400mV, and the optimum is -330mV. The normal redox environment in the aerobic activated sludge system is between +200 and +600mV.
2. pH value is an important factor causing the increase or decrease of ORP. The higher the pH value, the lower the ORP; the lower the pH value, the higher the ORP.
It is worth mentioning that although there is a certain correlation between pH and ORP in sewage, because ORP is also affected by factors such as microbial activity and dissolved oxygen, the correlation between pH and ORP is not as strong as in pure water.
Delfino company focuses on the R&D and production of water quality analysis instruments. Our measurement parameters include pH, ORP, conductivity, TDS, salinity, dissolved oxygen, COD, ammonia nitrogen, turbidity, chlorophyll, blue-green algae, residual chlorine, and chlorine dioxide. wait. In addition to ORP sensors, our main products include pH ORP analyzer, conductivity analyzer, turbidity analyzer, COD analyzer, dissolved oxygen analyzer, ammonium analyzer, chlorine analyzer, etc.
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