Yexsensor YEX-OIL-408-S Fluorescence Method Online Oil in Water Sensor: Industrial-grade Real-time Monitoring Core

In the fields of petrochemical, ship ports, industrial circulating water and environmental monitoring, real-time monitoring of oil content (petroleum substances) in water is the key to ensuring compliant discharge and process stability. Yexsensor's YEX-OIL-408-S, based on the fluorescence spectral characteristics of soluble oils, provides system integrators and engineering contractors with a high-precision, non-contact (optical) online monitoring solution.

Compared with traditional infrared spectrophotometry or gravimetric methods, YEX-OIL-408-S does not require any chemical extraction reagents, achieving true real-time continuous monitoring, greatly shortening the response time, and eliminating the risk of secondary pollution and high labor costs brought by manual sampling analysis.

Core Working Principle: Ultraviolet Fluorescence Detection Technology (UV Fluorescence)

The technical core of YEX-OIL-408-S lies in utilizing the excitation and emission characteristics of soluble oil molecules under specific wavelength spectra. The sensor has a built-in high-stability UV LED light source that emits monochromatic light targeting the absorption peak of petroleum molecules.

When oil substances in the water sample absorb energy, they transition from a high energy level back to the ground state and release characteristic fluorescence with longer wavelength. According to the laws of physical optics, the intensity of the emitted fluorescence has a strict linear relationship with the content of soluble oil in water within a specific concentration range.

UV LED Light Source System: It has the characteristics of long life, low power consumption and small temperature drift, ensuring constant light intensity output.

AC Drive Technology: By modulating the light source frequency and synchronous detection circuit, it effectively filters the background interference of ambient light and natural light, improving the purity of the signal.

YEX-OIL-408-S Fluorescence Method Online Oil in Water Sensor Product Technical Specifications and Key Parameters

YEX-OIL-408-S fully considers the harsh environment of industrial sites in its design and adopts a 316L stainless steel shell to ensure excellent corrosion resistance and mechanical strength.

1. Technical Performance Indicators

2. Hardware and Environmental Specifications

Design Optimization for System Integrators

1. Intelligent Self-cleaning Device
   The core pain point of oil in water monitoring is the contamination of the optical window (oil film adhesion, microbial growth or suspended solids scaling). Yexsensor YEX-OIL-408-S comes standard with an automatic cleaning brush that can be triggered regularly through the controller or system commands. This mechanical cleaning mechanism ensures the transparency of the optical path, greatly extends the on-site maintenance cycle of the sensor, and reduces the after-sales operation and maintenance costs for system integrators.

2. Industrial Communication and Standardized Integration
   The probe natively supports the RS-485 bus and follows the industrial standard Modbus RTU protocol. This allows the device to be directly connected to PLC, DCS, data acquisition instruments (RTU) or IoT gateways without additional signal transmitter modules.

Digital networking: A single bus supports mounting multiple probes, facilitating the construction of large-scale water quality monitoring networks.
   Dual-signal redundancy: In addition to digital communication, the optional 4-20 mA analog output provides good compatibility for traditional automation control systems.

YEX-OIL-408-S Fluorescence Method Online Oil in Water Sensor Electrical Connection and Engineering Wiring Specification

The sensor adopts a five-core high-quality shielded cable, designed to take into account both signal transmission anti-interference and weather resistance:

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

• Black wire: Power ground wire (GND)

• Blue wire: RS-485 signal A

• White wire: RS-485 signal B

• Yellow wire: 4-20 mA current output (optional item; if not selected, please keep it floating and isolated)

Engineering note: All cable connectors must undergo strict waterproof sealing treatment according to the installation environment during on-site deployment. Considering that the cable may be immersed for a long time or exposed to corrosive air, the user cable needs to have certain anti-corrosion ability, and the wiring sequence must be strictly checked before powering on.

YEX-OIL-408-S Fluorescence Method Online Oil in Water Sensor Typical Application Scenarios

Yexsensor YEX-OIL-408-S, with its excellent detection limit and anti-interference ability, is widely used in the following industrial and environmental protection fields:

• Petrochemical Industry Discharge Outlet Monitoring: Real-time monitoring of oil content in refinery and petrochemical plant discharge water to ensure compliance with environmental assessment standards.

• Industrial Circulating Water Quality Management: Online monitoring of heat exchanger leakage and early warning of equipment corrosion or damage through abnormal sudden changes in oil content.

• Ship and Platform Oil Spill Monitoring: Deployed on offshore platforms, port terminals and ballast water discharge outlets for early oil spill warning.

• Oilfield Produced Water Monitoring: Real-time control of oil removal device treatment effect in oilfield water injection or separate injection processes.

• Municipal and Water Source Protection: Monitoring illegal oil discharge pollution in urban rainwater pipe networks or landscape water bodies to protect drinking water sources.

Frequently Asked Questions (FAQ)

Q1: Can YEX-OIL-408-S detect all types of oils?

A1: The sensor is most sensitive to oil substances containing aromatic hydrocarbons (with benzene ring structure) or conjugated double bonds, including crude oil, fuel oil, diesel, lubricating oil and other petroleum substances. For pure synthetic saturated paraffins that do not contain fluorescent characteristics at all, the sensitivity will be relatively limited.

Q2: What are the core advantages of the fluorescence method compared to the infrared spectrophotometry?

A2: The core advantages are "no reagents required, extremely fast response, and low detection limit". The fluorescence method can measure directly in raw water without the toxic burden and operational complexity brought by extraction agents (such as tetrachloroethylene) required by the infrared method.

Q3: How does the sensor cope with turbidity or suspended particle interference in water?

A3: Yexsensor uses optical filters with specific wavelengths. Since the fluorescence emission light has a different wavelength from the excitation light, the system can effectively offset a certain concentration of suspended matter interference through optical filtering and differential circuits. However, in extremely high turbidity environments, it is recommended to configure pre-settling or filtering devices.

Q4: What is the maintenance frequency of the self-cleaning brush?

A4: The maintenance frequency depends entirely on the degree of pollution in the application environment. In relatively clean circulating water, check once every quarter; in heavily oily sewage outlets, it is recommended to check the brush wear monthly.

Q5: What are the specific spacing restrictions for the installation position?

A5: To avoid optical interference caused by pool wall reflection, the measurement window should be kept at least 2cm away from the side wall and at least 10cm away from the bottom of the container.

Q6: Does the sensor support remote online calibration?

A6: Yes. Through RS-485 Modbus commands, system integrators can remotely send zero point and slope calibration commands. During calibration, ensure that the sensor is placed in distilled water (zero point) or standard solution (slope) as specified.

Q7: Will ambient sunlight cause deviation in measurement results?

A7: The sensor adopts high-frequency AC drive light source technology, which can effectively identify and eliminate the interference of DC background light (such as sunlight), ensuring stable operation even in open-air monitoring stations.

Q8: Does the sensor have requirements for water flow rate?

A8: The fluorescence method is a physical optical measurement and is not sensitive to flow rate. It can work normally in both static water bodies and high-flow pipelines (within the pressure range).

Summary

Yexsensor YEX-OIL-408-S online oil in water sensor provides high-reliability hardware support for real-time monitoring of oil content in industrial environments. Its ultraviolet fluorescence technology not only ensures an extremely low detection limit, but also solves the industry problem of optical window scaling through intelligent self-cleaning design. For integrators who pursue long-term system stability and low operation and maintenance costs, YEX-OIL-408-S is an ideal sensing terminal for building a digital water quality monitoring network.