NBL-OIL-406-S Oil-in-Water Monitoring Sensor by Fluorescence Method: For Petroleum, Wastewater Monitoring

Real-time Precision and Long-term Stability: NiuBoL Fluorescence Method Online Oil-in-Water Monitoring Solution

Eliminating Background Light Interference and Achieving 24/7 Digitalized Oil Monitoring in Industrial Environments

Ultraviolet Fluorescence Technology: Extremely high sensitivity, fearless of suspended solids interference, achieving ultra-high resolution of 0.01 mg/L.

Industrial-grade Corrosion Resistance: 316L stainless steel body combined with IP68 protection, suitable for harsh underwater installation environments.

Seamless System Integration: Standard RS485 Modbus-RTU protocol, easily connects to PLC, DCS and various cloud platforms.

NBL-OIL-406-S Online Oil-in-Water Monitoring Sensor by Fluorescence Method Product Overview

In industrial wastewater discharge monitoring, petrochemical process control, and environmental water quality early warning, real-time monitoring of oil content in water is crucial. The NiuBoL NBL-OIL-406-S online oil-in-water sensor is tailored to address the pain points of system integrators (SI) and engineering contractors.

Traditional oil measurement methods are often limited by chemical reagent consumption or easily affected by water turbidity, while the NBL-OIL-406-S adopts the fluorescence method principle. It only needs to use monochromatic light of a specific wavelength to excite soluble oil molecules in water, and directly convert the emitted fluorescence intensity into oil content. This non-contact measurement concept not only improves response speed (less than 30 seconds) but also significantly reduces operation and maintenance costs. For project parties seeking high-reliability and low-maintenance water quality monitoring solutions, NiuBoL is a core component for achieving environmental compliance and intelligent management.

NBL-OIL-406-S Online Oil-in-Water Monitoring Sensor Core Technical Advantages

1. Excellent Optical Stability: UV LED Light Source
   The core of NBL-OIL-406-S adopts a high-performance UV LED cold light source. Compared with traditional xenon flash lamps, UV LED has extremely high spectral stability, extremely small long-term drift, and a working life of tens of thousands of hours. This means that in long-term monitoring projects, the sensor does not require frequent calibration, greatly extending the system's operational life cycle.

2. Powerful Environmental Anti-interference Algorithm
   For complex natural light or ambient stray light in industrial sites, the NiuBoL R&D team introduced AC drive technology. By modulating the excitation light source frequency and combining it with digital signal processing (DSP) algorithms, the sensor can effectively filter background stray light noise interference. Even in semi-open channels or daylight-exposed environments, it can output precise and linear measurement data.

3. Industrial Design Born for Engineering Sites
   Material: The housing is completely made of precision-machined 316L stainless steel, with extremely strong electrochemical corrosion resistance. It is suitable for both freshwater and weak acid-base and some saline industrial wastewater environments.
   Sealing: Achieves strict IP68 protection rating, supporting long-term submerged installation.
   Maintenance: Uses a flat optical window design that is not easy to attach microorganisms and air bubbles. Even if cleaning is needed, simple physical wiping can restore performance.

4. Digital Integration and Low Power Consumption
   The sensor natively supports the standard RS485 Modbus-RTU digital interface, demonstrating excellent adaptability in distributed monitoring networks. Users can directly read data through PLC or wireless gateways and support optional 4-20mA analog output. At the same time, the extremely low power consumption of 0.2W gives it an incomparable endurance advantage in solar-powered field monitoring stations.

NBL-OIL-406-S Online Oil-in-Water Monitoring Sensor by Fluorescence Method Technical Specifications

NBL-OIL-406-S Online Oil-in-Water Monitoring Sensor by Fluorescence Method Industry Application Scenarios

• Petroleum, Petrochemical and Refinery Wastewater Monitoring: Real-time monitoring of oil content in circulating cooling water and production wastewater to prevent oil leakage accidents from entering the environmental pipe network and ensure enterprises meet environmental discharge standards.

• Urban Surface Water and Rainwater Pumping Stations: Installed at rivers, lakes or urban drainage outlets as part of the environmental early warning system to quickly detect and locate sudden oil spill pollution.

• Industrial Circulating Water Treatment: Monitoring water quality changes in cooling towers, heat exchangers and other links through NiuBoL sensors to effectively warn of equipment leakage and protect the system from oil scale pollution.

• Seawater Desalination and Inlet Pretreatment: Monitoring hydrocarbon content at seawater inlets to avoid trace oil pollution of membrane systems and reduce the frequency of expensive reverse osmosis membrane replacement.

Installation and Electrical Connection

Installation Specification Recommendations

To ensure the measurement window can fully represent the real water body condition and reduce physical damage, please follow the following engineering guidelines:

• Distance Requirements: The sensor front measurement window should maintain at least 2cm from the side wall and at least 10cm from the container bottom to avoid marginal reflection effects affecting readings.

• Angle Recommendation: It is recommended to use submerged vertical installation and ensure the sensor front end is completely submerged below the water surface without being blocked by air bubbles.

Cable Definition

The NBL-OIL-406-S uses 5-core high-protection shielded wire to ensure signal stability during long-distance transmission:

• Red wire: Power positive (12～24V DC)

• Black wire: Ground (GND)

• Blue wire: RS485-A

• White wire: RS485-B

• Yellow wire: Current output (optional; if not in use, please insulate and wrap properly)

Note: All wiring terminals must undergo waterproof sealing treatment (such as using waterproof junction boxes) to prevent moisture from seeping into the device along the cable and causing electronic component damage.

FAQ

Q1: Can the range of NiuBoL oil-in-water sensor be customized?

A: The standard range is 0-40mg/L, suitable for most environmental monitoring and process control. If your project involves ultra-high concentration monitoring, please contact our technical team for demand evaluation.

Q2: What are the advantages of fluorescence method compared with infrared method for oil measurement?

A: The fluorescence method has higher sensitivity (minimum detection limit can reach 0.4mg/L) and stronger selectivity. It can effectively avoid interference from non-oil organic matter in water, with extremely fast response speed, making it more suitable for online continuous monitoring.

Q3: Does this sensor require the use of chemical reagents?

A: No. The NBL-OIL-406-S belongs to physical optical principle monitoring and does not require any chromogenic agents or extraction solvents. It is a true zero-pollution, zero-consumable solution.

Q4: Can the sensor detect all types of oil?

A: The sensor determines content by detecting soluble oil molecules with fluorescent characteristics. It has excellent linear response for most petroleum-based hydrocarbons (such as crude oil, diesel, and fuel oil).

Q5: What is the usual maintenance cycle?

A: This depends on the on-site water quality. In clean water bodies, check the window every 3-6 months. In industrial wastewater, it is recommended to check monthly and wipe the optical window with a soft cloth to ensure light path transparency.

Q6: How to perform calibration?

A: Supports zero point calibration (using distilled water) and slope calibration (using standard solution of known concentration). Calibration parameters can be written by sending specific Modbus commands via RS485. The operation is simple.

Q7: Can the cable be lengthened?

A: The standard cable length is 5 meters. Due to the use of digital signal output, the cable can be lengthened to hundreds of meters according to needs without affecting measurement accuracy.

Q8: What if there is no AC power at the monitoring point?

A: The sensor power consumption is only 0.2W, which is very suitable for use with a 12V solar power supply system combined with a small battery. It is the first choice for remote area monitoring.

Expert Summary and Integration Suggestions

The NiuBoL NBL-OIL-406-S is an industrial-grade oil measurement tool that balances durability and precision. For system integrators, it not only provides a stable and reliable data source but also reduces development difficulty through digital communication interfaces.

If you are facing complex water quality, high maintenance costs, or large data fluctuations at industrial sites, NiuBoL can provide you with customized integration suggestions.

Want to know how this sensor can be connected to your IoT platform? Or need to obtain a detailed Modbus communication protocol manual? Please feel free to contact our engineering team. We provide comprehensive technical selection support and testing solutions to help your water treatment project be delivered successfully!

NBL-OIL-406-S Online Oil-in-Water Monitoring Sensor Data Sheet

NBL-OIL-406-S Online Oil-in-Water Monitoring Sensor.pdf