Y551-B/C UV254 COD Sensor
Yosemitech Y551-B/C self-cleaning COD sensor adopts UV absorption technology to accurately quantify dissolved organic contaminants in water. It measures the absorption of organic molecules at a wavelength of 254 nm using UV light. The sensor features an integrated turbidity detection light source that automatically compensates for turbidity interference in water samples. Additionally, it is equipped with a self-cleaning brush, ensuring excellent stability during long-term online monitoring.
- Requires no reagents, ensuring pollution-free operation, and offering a more economical and environmentally friendly solution;
- Capable of measuring multiple parameters, including COD, TOC, turbidity, and temperature;
- Features automatic compensation for turbidity interference;
- Equipped with a self-cleaning brush that effectively prevents microbial adhesion, significantly extending the maintenance cycle;
- Includes calibration parameters to facilitate on-site and secondary calibration processes.
| Name | Y551-B COD Sensor（low range） | Y551-C COD Sensor（high range） |
| Measuring principle | ultraviolet absorption method | ultraviolet absorption method |
| COD range | 0-500mg/L | 0-1500mg/L |
| COD accuracy | ±5% | ±5% |
| Resolution | 0.01mg/L | 0.01mg/L |
| TOC range | 0-180mg/L | 0-600mg/L |
| Turbidity range | 0-500NTU | 0-500 NTU |
| Temperature range | 0-50℃ | 0-50℃ |
| IP range | IP68 | IP68 |
| Interface | RS-485，MODBUS protocol | RS-485，MODBUS protocol |
| Power | 0.25W（non wiping），0.8W（wiping） | 0.25W（non wiping），2W（wiping） |
| Power supply | DC 12-24V，≥1A | DC 12-24V，≥1A |
| Size | Φ50mm*179mm | Φ50mm*179mm |
| Cable length | 10m (default), customizable | 10m (default), customizable |
| Sensor housing material | 316L（Ti） | 316L（Ti） |
- COD Sensor
- Metal Protective Cover
- 10m Cable（default), Customizable
- Brush Component
Source Water Monitoring:
It is excellent for source water quality monitoring, helping to maintain the compliance of our sources with safety and health laws.
Surface Water Monitoring:
Well-suited to the detection of organic pollutants in natural and flowing water bodies like rivers, lakes etc.
Municipal Sewage:
In municipal waste water treatment plants to provide on-line monitoring of key organic pollutants, this helps to comply with environmental regulations.
Industrial Wastewater:
typically applicable in industrial settings which require the monitoring of organic pollutants for process control and regulatory compliance.
COD Analysis:
COD measures the total amount of oxygen required to chemically oxidize all organic matter in a water sample using a strong oxidizing agent like potassium dichromate.
The COD process typically involves heating the sample with the oxidizer at a high temperature, after which the amount of oxidizer remaining is measured.
COD analysis does not differentiate between biologically available and unavailable forms of organic matter.
BOD Analysis:
BOD measures the amount of oxygen used by microorganisms to decompose organic matter in a water sample over a specific period, usually 5 days (BOD5).
BOD analysis is conducted under controlled temperature conditions and typically involves measuring the reduction in oxygen levels in the water sample before and after incubation.
BOD analysis reflects only the biologically available forms of organic matter.
In summary, COD provides a general picture of the organic pollution in water, while BOD specifically indicates the amount of oxygen that microorganisms will consume to break down the organic pollutants, which is a measure of the water's biological pollution.
UV254 is a water quality test parameter that provides a quick measurement of the organic matter in water. The measurement technique works by shining ultraviolet light (UV) light at 254 nm through a quartz cells that contains a representative water sample. Most commonly, the cell is 1 cm (10 mm) but can vary dependent on the application and water quality.
Organic compounds, specifically those that contain aromatic rings or unsaturated carbon bonds (double or triple) in their molecular structure, absorb a portion of the UV light as it passes through the water sample. Since the intensity of the light source is known, a detector on the other side of the cell is used to measure the amount of light absorbed by organic compounds present in the sample.
UV254 is typically expressed as either UV absorbance (UVA) per cm (cm-1) or UV transmittance (UVT) %. In some cases, UV254 is referred to as Spectral Absorption Coefficient (SAC254).
UV254 and UVT are both valuable water quality measurement for many applications, including UV disinfection performance monitoring, raw water monitoring for event detection, coagulation control, and DBP precursor monitoring. The method for measurement is simplistic and does not involve the use of reagents. There are multiple ways in which UV254 or UVT can be measured including; continuously in real-time with a bypass analyzer or submersible probe sensor, grab samples throughout the plant with a portable test meter, or in laboratory with a test meter or benchtop spectrophotometer.
Monitoring COD (Chemical Oxygen Demand) in water is essential for several reasons:
Pollution Control:
COD is a key indicator of the level of organic pollution in water bodies. High COD levels suggest the presence of organic pollutants that can deplete oxygen levels, potentially harming aquatic life and ecosystems.
Wastewater Treatment:
In wastewater treatment plants, monitoring COD helps in assessing the efficiency of the treatment processes. It ensures that the treated water meets the required environmental standards before being discharged into water bodies.
Regulatory Compliance:
Many regulatory agencies set limits on the COD levels of wastewater that can be discharged into the environment. Regular monitoring is necessary to comply with these regulations and avoid penalties.
Environmental Impact Assessment:
COD data is crucial for evaluating the environmental impact of industrial discharges and for implementing measures to reduce pollution.
Water Quality Management:
For drinking water suppliers, monitoring COD helps in ensuring that the water is safe for consumption by meeting the required quality standards.
Resource Management:
In industries, monitoring COD can help in optimizing the use of treatment chemicals and processes, leading to cost savings and more efficient resource management.
Health and Safety:
Elevated COD levels can indicate the presence of harmful organic compounds that may pose health risks to humans and animals if they enter the food chain or drinking water supplies.
Source Water Monitoring: COD probe is ideal for monitoring the quality of water sources, ensuring they meet safety and quality standards.
Surface Water Monitoring: Effective for detecting organic pollutants in rivers, lakes, and other natural water bodies.
Municipal Wastewater: Useful in municipal wastewater treatment plants for continuous monitoring of organic pollutants to ensure compliance with environmental regulations.
Industrial Wastewater: Applicable in various industrial settings where monitoring of organic pollutants is necessary for process control and regulatory compliance.
From April 21th to 23rd, 2025, IE Expo China 2025 concluded successfully at the Shanghai New International Expo Centre. As a highly anticipated communication platform in the industry, the exhibition attracted exhibitors, experts, scholars, and industry elites from around the world to gather in Shanghai. Through various forms such as cutting - edge technology displays and high - end forum sharing, it created a professional and forward - looking audio - visual feast for the industry.
Suzhou Yosemite Technology Co., Ltd. ("YOSEMITECH"), which has been deeply involved in the water quality monitoring field for over 11 years, always adheres to the mission of "Water Monitoring Made Simple". YOSEMITECH showcased its self - developed water quality monitoring sensors and instruments at the exhibition. As a manufacturer of water quality monitoring sensors, we had in - depth exchanges with domestic and foreign partners and industry peers during the exhibition. It fully demonstrated its profound expertise in areas such as water quality sensor research and development and intelligent monitoring system integration, and continuously empowered global water quality monitoring scenarios with innovative technologies to promote the efficient and intelligent development of the industry.
Yosemitech Y552-B UV254 COD Sensor Calibration
Required equipments and raw materials
required equipments: three 250ml brown bottles, one 1L brown bottles, one power adapter, one USB converter, 10m cable.
raw materials: 150mg/L standard solution, 450mg/L standard solution, distilled water or deionized water.
Calibration steps
There are two methods of user calibration for the COD sensor: 1-point calibration and 2-points calibration.
1-point calibration was done in 150mg/L standard solution, 2-points calibration was done in 150mg/L and 450mg/L standard solution.
1-point calibration step (change the K value)
Step 1：Put the COD sensor into deionised water. Open the SmartPC software and click "self-calibration". Wait for the self-calibration value to stabilize.
Step 2：Then put the COD sensor into 150mg/l standard solution, click "1 Point". Wait for the 1 point calibration value to stabilize.
2-points calibration step (change the K and B values)
Step 1：Put the COD sensor into deionised water. Open the SmartPC software and click "self-calibration". Wait for the self-calibration value to stabilize.
Step 2：Then put the COD sensor into 150mg/l standard solution, click "2 Point". Wait for the calibration value to stabilize in the first solution.
Step 3：Then put the COD sensor into 450mg/l standard solution, Wait for thecalibration value to stabilize in the second solution.
