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YEX-S2-FLU Online Fluoride Ion Sensor

Long-term stable online fluoride monitoring — Patented reference system, anti-interference, easy integration

Excessive fluoride ion concentration in water bodies brings environmental and health risks, while traditional fluoride sensors are prone to data instability due to reference potential drift, electrode aging, or limited installation angles. The YEX-S2-FLU uses a crystal membrane-based fluoride ion selective electrode and is equipped with a pressurized reference system, significantly improving electrode life and measurement stability. It supports RS-485 Modbus and optional 4-20mA output, allowing flexible integration into various industrial control systems.

Three Core Advantages

• Patented Reference System, Longer Electrode Life
  Internal reference solution slowly seeps out under ≥100kPa pressure, resulting in extremely stable reference potential. Electrode life is significantly better than ordinary industrial electrodes.

• Flexible Signal Output, Easy Integration
  Standard RS-485 Modbus/RTU, optional 4-20mA, can be quickly connected to PLC, DCS, touch screens or wireless terminals.

• High Installation Adaptability, IP68 Protection
  3/4-inch NPT thread design supports submersible, pipe or tank installation, adapting to various engineering sites.

YEX-S2-FLU Online Fluoride Ion Sensor Product Value

Online monitoring of fluoride ions has long faced two major engineering challenges: poor electrode stability leading to frequent calibration, and limited installation angles causing bubble residue or measurement deviation. The YEX-S2-FLU fundamentally solves the reference potential drift problem through its patented pressurized reference system and crystal membrane electrode structure, achieving true long-term stability.

At the same time, the sensor supports Modbus and analog output, flexibly adapting to new or renovation projects. The IP68 protection and POM/316L material combination makes it suitable for tap water plants, industrial wastewater, groundwater monitoring and other corrosive or high-humidity environments.

YEX-S2-FLU Online Fluoride Ion Sensor Technical Advantages

Patented Fluoride Ion Electrode System

Adopts fluoride ion selective crystal membrane electrode. The reference side slowly seeps out reference solution through a micro-porous salt bridge under ≥100kPa (1Bar) positive pressure. This structure keeps the reference potential stable for a long time, significantly reduces zero-point drift, and provides electrode life far superior to traditional open reference electrodes.

Automatic Temperature Compensation

Built-in Pt1000 temperature sensor participates in ion activity compensation in real time, ensuring measurement accuracy under different water temperatures. Response time T90 is less than 60 seconds, meeting the real-time requirements of online monitoring.

Dual Material Options, Adapt to Different Water Bodies

• YEX-S2-FLU-A: POM+ABS housing, suitable for conventional water quality

• YEX-S2-FLU-S: POM+316L stainless steel, suitable for more corrosive or higher mechanical strength requirements

Flexible Output and Power Supply

• Standard RS-485 (Modbus/RTU)

• Optional 4-20mA analog output (yellow wire)

• 12～24VDC wide voltage supply, power consumption only 0.2W@12V

Installation Angle Tips

Unlike conventional sensors, fluoride ion sensors cannot be installed upside down or horizontally. They must be tilted at least 15° or more to ensure normal operation of the internal reference system and avoid bubble interference.

YEX-S2-FLU Online Fluoride Ion Sensor Technical Specifications

YEX-S2-FLU Online Fluoride Ion Sensor Typical Application Scenarios

• Drinking Water Treatment Plants: Monitor fluoride concentration in raw water and finished water to ensure compliance with the limits of the Sanitary Standard for Drinking Water.

• Industrial Wastewater Discharge: Online monitoring of fluoride ions in wastewater from electronics, electroplating, fluorine chemical and other industries to assist neutralization process control.

• Groundwater and Well Water Monitoring: Long-term continuous monitoring of fluoride trends in high-fluoride areas for environmental hydrogeological surveys.

• Mining Water Environment: Fluoride monitoring in mine water inflow or tailings pond leachate for pollution source identification and treatment evaluation.

• Aluminum Electrolysis and Other Industrial Circulating Water: Monitor fluoride in fluorine-containing process water or circulating cooling water to prevent equipment corrosion or environmental pollution.

Wiring and Installation Instructions

Wiring Definition (5-core twisted shielded cable)

• Red: 12～24VDC Power Positive

• Black: GND Ground

• Blue: 485A

• Green: 485B

• Yellow: 4-20mA Output (optional, leave floating if not used)

Key Installation Requirements

• Do not install upside down or horizontally; must maintain at least 15° tilt angle

• Use 3/4 inch NPT thread for fixation, supporting submersible or pipe installation

• All wiring must be waterproofed; cable should have corrosion resistance

Pre-use Treatment
Before first use, immerse the electrode front end in distilled or deionized water for 10 minutes. For long-term storage, clean and dry before returning to original packaging.

FAQ

Q1: Does the YEX-S2-FLU require reagents or consumables?

No. It uses the ion selective electrode method, requires no added reagents, and only needs regular calibration and electrode maintenance.

Q2: Why can't the sensor be installed horizontally or upside down?

Because the internal reference solution slowly seeps out under positive pressure, inversion or horizontal orientation will affect the stability of reference solution seepage, causing measurement drift. It must be tilted more than 15°.

Q3: What is the difference between the two models (-A and -S)?

The main difference is the housing material. -A is POM+ABS, suitable for conventional water bodies; -S is POM+316L stainless steel, with higher corrosion resistance and mechanical strength, suitable for industrial wastewater, seawater or highly corrosive environments.

Q4: What output methods does the sensor support?

Standard RS-485 Modbus/RTU, optional 4-20mA analog output. Both can coexist.

Q5: How to perform two-point calibration?

Use zero-point standard solution and slope standard solution (e.g. 1mg/L and 10mg/L). Immerse the sensor, wait for stabilization for 5 minutes, then execute calibration via Modbus command.

Q6: How long is the electrode life?

Under normal use and maintenance conditions, electrode life is better than ordinary industrial electrodes. The manufacturer provides a six-month warranty; actual service life depends on water quality and maintenance.

Q7: What is the working pH range?

4～10. Beyond this range, the response of the ion selective electrode may be affected; avoid or pre-treat.

Q8: Is it necessary to clean the electrode crystal membrane?

If the crystal membrane becomes semi-transparent or has deposits, rinse with distilled or deionized water. Do not wipe or scrape. Replace the electrode if it fails after long-term use.

Summary and Engineering Recommendation

The YEX-S2-FLU is an online sensor designed for industrial and water utilities users who truly need long-term stable fluoride data. Its patented pressurized reference system solves the core pain points of traditional fluoride sensors — large drift and short lifespan. Combined with RS-485 or 4-20mA output, it can be quickly integrated into new or renovation projects.

When selecting a model, choose YEX-S2-FLU-A for conventional water quality, and YEX-S2-FLU-S for corrosive or high-salinity environments.

For customized cable lengths, supporting installation brackets, or to obtain Modbus communication protocol documents, please contact the Yexsensor technical support team. Sample testing and on-site application solutions can be further discussed.