What is a COD Sensor

Introduction

In the realm of water quality monitoring, Chemical Oxygen Demand (COD) sensors play a pivotal role. They are essential tools for gauging the organic pollution levels in water bodies.

What is a COD Sensor?

A Chemical Oxygen Demand Sensor, abbreviated as COD Sensor, is an instrument designed to measure the amount of oxygen required to oxidize organic and certain inorganic materials in a water sample. By quantifying the COD parameter, we can determine the extent of organic pollution in water. Higher COD values indicate a greater presence of organic pollutants, signifying more polluted water.

Typically, COD sensors operate based on different principles. The RK500 - 25 COD Sensor from RIKA SENSOR adopts  two light sources, one is ultraviolet light for measuring COD content in water and the other is reference light for measuring turbidity in water. This sensor measures the extent to which these organics absorb UV light at 254 nm to accurately determine the content of dissolved organic pollutants in water. It also uses a reference light to measure turbidity in water.

Why Use a COD Sensor?

Monitoring water quality is crucial for a variety of reasons, and COD sensors are indispensable in this process. Firstly, in wastewater treatment plants, measuring COD levels helps to ensure that the treated water meets environmental standards before being discharged. High levels of wastewater COD can deplete the dissolved oxygen in receiving water bodies, leading to negative impacts on aquatic ecosystems.

Secondly, in industrial processes, COD sensors enable real - time monitoring of water quality. This helps industries to optimize their production processes, prevent contamination, and comply with environmental regulations. In drinking water purification, COD sensors guarantee that the water is safe and clean for consumption. Overall, COD monitoring provides valuable data for making informed decisions regarding water treatment and resource management.

COD Sensor Features

1. High Precision and Sensitivity

The RK500 - 25 COD Sensor boasts high precision with an accuracy of ±5%F.S and a resolution of 0.02mg/L. This allows for accurate detection of even slight changes in COD levels in water samples. Its high sensitivity enables it to detect trace amounts of organic pollutants, making it suitable for applications where precise measurements are required.

2. Fast Response

With a response time of less than 2 seconds, the RK500 - 25 COD Sensor can quickly provide real - time data on water quality. This is crucial for timely decision - making in water treatment processes. For instance, in a water treatment plant, if there is a sudden increase in COD levels, operators can take immediate corrective actions based on the sensor's rapid response.

3. Excellent Stability

Thanks to the algorithm that compensates for optical path attenuation, the RK500 - 25 COD Sensor offers excellent stability. It can maintain reliable measurement results even in the presence of particulate suspended matter impurities, ensuring consistent performance over time.

4. Wide - Range Applicability

This sensor has a wide measurement range for both COD (0 - 500mg/L, 0 - 1000mg/L) and turbidity (0 - 200NTU), making it suitable for various water sources. Whether it's measuring the relatively clean water in a reservoir or the highly polluted water in urban sewage, the RK500 - 25 COD Sensor can perform accurately.

5. Simple Operation

The RK500 - 25 COD Sensor is user - friendly. Its design and operation do not require highly specialized skills, which reduces the learning curve for operators. This simplicity also contributes to its widespread use in different water quality monitoring scenarios.

6. Multiple Output Signals

It provides 4 - 20mA and RS485 output signals. The 4 - 20mA analog signal is convenient for traditional monitoring systems, while the RS485 digital signal enables easy integration with modern digital monitoring and control systems.

7. Robust Build

Made of 316L stainless - steel probe material and with an IP68 ingress protection rating, the sensor is highly resistant to corrosion and can withstand harsh environmental conditions. It can operate in a temperature range of - 5 - +60℃ under a pressure of less than 0.5MPa, and has a storage condition of 10 - 60℃ at 20% - 90%RH.

Applications and Necessity

Wastewater Treatment

In wastewater treatment plants, the RK500 - 25 COD Sensor is used to monitor the influent and effluent water quality. By measuring the COD levels, operators can assess the efficiency of the treatment process and make adjustments as needed to ensure that the discharged water meets the required environmental standards.

Industrial Processes

Industries such as manufacturing, food and beverage, and chemical production require continuous monitoring of water quality. The RK500 - 25 COD Sensor can be integrated into their production systems to detect any potential contamination in the water used in their processes. This helps to prevent product quality issues and comply with environmental regulations.

Environmental Monitoring

Environmental monitoring agencies can use the RK500 - 25 COD Sensor to monitor the water quality of rivers, lakes, and other water bodies. By regularly measuring the COD levels, they can detect any changes in water quality over time and take appropriate measures to protect the environment.

In conclusion, the RK500 - 25 COD Sensor by RIKA SENSOR is a reliable and advanced water quality sensor. Its unique features and wide range of applications make it an ideal choice for COD monitoring in various fields, contributing significantly to water quality management and environmental protection.