RS485 Optical Water Dissolved Oxygen Sensor For Industrial Sewage Water Treatment

Daruifuno's OPD790 dissolved oxygen sensor uses the fluorescence method to measure dissolved oxygen. The core is the "fluorescence quenching principle": excitation light of a specific wavelength is irradiated onto a fluorescent sensitive material (such as platinum or ruthenium dye). In the absence of oxygen interference, the fluorescence intensity or lifetime is stable; oxygen molecules will "quench" the fluorescence, causing its lifetime to shorten and the intensity to decrease; the dissolved oxygen concentration is calculated by detecting the change in fluorescence lifetime.

Advantages and features of fluorescence dissolved oxygen OPD790
1. No electrolyte and membrane required, more durable
The electrolyte and oxygen permeable membrane in traditional electrodes are not used, and the structure is simpler. It avoids problems such as membrane pollution, aging, and breakage, and reduces maintenance frequency and cost.

2. Maintenance-free and long-term stability
The fluorescence sensor almost does not need to replace consumables regularly, and the maintenance cycle is longer. It is suitable for long-term online monitoring, with good data stability and small drift.

3. Strong anti-interference ability
Not affected by the flow rate in the water (no agitator or circulation pool is required to ensure the flow rate). It has strong anti-pollution ability and has little effect on oil, suspended matter, bubbles, etc. It is more suitable for highly polluted water bodies or low flow rate environments.

4. Fast response speed
The fluorescence quenching reaction is very rapid, and the response time is generally less than 60 seconds, which is suitable for dynamic monitoring.

5. Low power consumption design
Suitable for battery-powered systems, especially for outdoor and aquatic buoys.

6. Accurate measurement and good repeatability
High precision, low drift, and repeatability better than traditional polarography. Especially suitable for application scenarios that require high precision and long-term online monitoring.

7. High degree of intelligence
Can be directly connected to the SCADA system through digital signal output (MODBUS). Supports remote calibration, fault diagnosis and data transmission.

Specification:

Brief introduction:

• Support handheld devices and in-situ applications
• Adopt optical measurement technology based on Fluorescence principle
• The sensor does not require consumables or maintenance during use, can greatly reduce the cost of use
• Low sensor drift and longer calibration interval
• Without consuming oxygen, accurate measurement can be achievedwhen oxygen concentrationis low
• All-in-one package, the dissolved oxygen sensor can be used with the online transmitters, DTU, and portable instruments
• RS485 interface, Modbus RTU,support access to standard industrial control system
• The protection grade is IP68, can work continuously and stably under water for a long time
• Internal storage of calibration data, support offline calibration, plug and play on site
• Optional cleaning nozzle for underwater cleaning

Please click the user manual of DO sensor here:
OPD79 dissolved oxygen user manual.pdf

Daruifuno's OPD790 dissolved oxygen sensor has 1"NPT threads at both ends:

1. Universal standard, strong compatibility

NPT (National Pipe Thread) is an American standard for tapered pipe threads, widely used in the field of industrial fluid connections. The 1-inch diameter is the universal size of most sensors and pipeline interfaces, and is easy to match with existing equipment.

2. Threads at both ends, supporting multiple installation directions

Both ends have threads: one end can be used for installation, and the other end can be connected to an extension rod, a sheath or a reverse fixing accessory to improve adaptability. It supports multiple installation methods such as insertion, immersion, and pipeline bypass.

3. Good sealing and strong anti-leakage ability

NPT is a tapered thread. The thread part becomes tighter as it is screwed. Combined with sealing tape or thread glue, reliable sealing can be achieved to avoid water seepage or pollution.

4. Stable installation and good seismic performance

Compared with snap-on or sliding installation, the threaded fixing structure is more reliable, especially safer and more reliable under conditions such as flow velocity impact and vibration.

Aplication:
◇ Sewage: long-term online, high stability, strong anti-pollution
◇ Surface water monitoring:strong anti-interference, suitable for low flow rate environment in the wild
◇ Aquaculture water bodies: Fast response, suitable for dynamic change scenarios
◇ Urban sewage treatment
◇ Industrial wastewater treatment
◇ Aquarium: fast response, suitable for dynamic change scenarios
◇Drinking water plant: no reagents, less maintenance, clean and hygienic

Suzhou Delfino Environmental Technology Co., Ltd. is a professional manufacturer of water analysis instruments and sensors, integrating development and production together. Our main products include online, portable water quality analysis instruments. Since its establishment, we have focused on the development and production of water quality analysis instruments.

The monitoring parameters of water quality analyzer instruments mainly include: pH, ORP, dissolved oxygen, conductivity/TDS/salinity, turbidity, SS, Chlorophyll, Blue-green algae, COD, NH4-N, NO3, free chlorine, peracetic acid and so on.

As the rapid growth of the global economy leads to increased consumption and urbanization, solid waste generation has increased significantly, directly affecting the water and wastewater treatment industry. Daruifuno aims to provide solutions to various industries and fields and create a cleaner and healthier drinking water environment for the earth.

Our products mianly application for follows industry：Municipal sewage water treatment plant, industrial wastewater treatment plant, Chemical, Petroleum, Papermaking, Food and drinking, Medicine, Electroplating, PCB plant, fish farm,Lake/river/ocean/groundwater/surface and so on.

Our company was established in 2015, but our predecessor has been committed to the water quality testing industry for more than 10 years. At present, we have our own R&D center with many senior engineers with more than 10 years of experience in the research and development of water quality analyzers and water quality sensors, and are equipped with strict front-line production workers, professional quality inspection personnel and testing equipment to check every process.

As a high-tech enterprise in China, our production is strictly in accordance with ISO9001 from raw material sources to finished equipment. After years of efforts, the company has obtained more than 20 patent certificates, high-tech enterprise certificates, CE, SGS, etc. He has accumulated rich practical experience in the field of water quality testing and has unique insights in the field of water quality testing.

Our company takes "reasonable prices, efficient production time, and good after-sales service" as its purpose and adheres to the business philosophy of "based on quality and creating value for customers". At present, the company is actively exploring the international market and actively promoting its own brands and products. It has been exported to Asia, Southeast Asia, Europe, Africa, and South America, with customers in more than 50 countries and regions around the world. And hope to develop together with customers for mutual benefit with high-quality products and sincere services.