NBL-WQ-CLI-4 Online Chloride Ion Sensor | Solid Membrane Chloride Ion Selective Electrode |Chloride Monitoring

NiuBoL NBL-WQ-CLI-4 online chloride ion sensor adopts patented solid membrane ion selective electrode with automatic temperature compensation. It is specially designed for industrial wastewater, seawater desalination, circulating cooling water and environmental monitoring, providing high-stability, high-precision and low-maintenance real-time online chloride ion measurement solutions to help system integrators and engineering contractors accurately control chloride ion concentration and corrosion risks.

Precise Monitoring of Chloride Ion Concentration in Water to Effectively Prevent Corrosion Risks and Control Process

High chloride ion concentration often leads to equipment corrosion, pipeline damage and excessive discharge. This is particularly prominent in industrial wastewater, seawater utilization and circulating water systems. NiuBoL NBL-WQ-CLI-4 split-type online chloride ion sensor effectively solves the pain points of traditional electrodes such as short lifespan, serious drift, complex maintenance and difficult system integration through patented solid membrane electrode and industrial-grade stable design, providing professional support for long-term continuous and reliable monitoring.

Three Core Advantages

• Patented Solid Membrane Electrode High Stability: Internal reference solution slowly seeps out under 1Bar pressure, stable reference system, significantly extended electrode life.

• Wide Range High Precision Measurement: Supports 0~35000 mg/L range, automatic Pt1000 temperature compensation, accuracy ±5% of reading, adaptable to various working conditions.

• Strong Anti-interference & Easy Integration: RS-485 Modbus RTU protocol + optional 4-20mA output, fast access to PLC, DCS, SCADA and IoT systems.

NBL-WQ-CLI-4 Online Chloride Ion Sensor Overview

NiuBoL NBL-WQ-CLI-4 online chloride ion sensor is a professional solid membrane ion selective electrode monitoring device launched by NiuBoL, specially used for fast and accurate online detection of free chloride ion content in water.

The product is divided into two versions: NBL-WQ-CLI-4A (POM+ABS economic type) and NBL-WQ-CLI-4S (POM+316L corrosion-resistant type), adapting to different media environments. IP68 protection rating combined with 3/4 NPT pipe thread installation method supports submersible, pipeline and tank installation. Built-in automatic temperature compensation function with wide pH working range of 2～12, effectively meeting the stringent requirements for chloride ion monitoring in complex industrial sites.

NBL-WQ-CLI-4 Online Chloride Ion Sensor Key Advantages

1. Patented Solid Membrane Chloride Ion Electrode
       Adopts patented chloride ion selective electrode. The internal reference solution seeps out extremely slowly through the microporous salt bridge under ≥100KPa pressure, forming a highly stable reference system. Electrode life is much longer than ordinary industrial electrodes, greatly reducing replacement frequency and operation & maintenance costs.

2. High Precision and Wide Range Adaptability
       Provides two range options: 0~3500 mg/L and 0~35000 mg/L. Resolution 0.1 mg/L (low range), accuracy ±5% of reading, temperature accuracy ±0.3℃, response time T90＜60s, meeting monitoring needs from low concentration environmental water to high salinity wastewater.

3. Industrial-grade Protection and Material Selection
       IP68 protection rating supports long-term immersion use. The 4S type adopts 316L stainless steel shell, suitable for highly corrosive media. The product has undergone 72-hour aging and stability testing before delivery to ensure high reliability.

4. Installation and System Integration Friendly
       Standard 3/4 NPT pipe thread design for easy installation. Open Modbus RTU protocol facilitates quick access to various industrial control systems, significantly shortening project integration cycle.

5. Simple Maintenance
       Supports two-point calibration with clear and standardized operation. Detailed electrode maintenance guidelines are provided. Daily maintenance workload is low, suitable for long-term on-site operation.

NBL-WQ-CLI-4 Online Chloride Ion Sensor Technical Specifications

Applications

NiuBoL NBL-WQ-CLI-4 online chloride ion sensor is widely used in the following scenarios:

• Industrial circulating cooling water systems: Monitor chloride ion concentration, assess corrosion risk, and guide corrosion inhibitor dosing.

• Seawater desalination and seawater utilization: Track chloride ion changes in inlet and outlet water in real time and optimize membrane treatment processes.

• Industrial wastewater and chemical processes: Used for chlorine-containing wastewater treatment and discharge outlet monitoring to ensure environmental compliance.

• Municipal sewage plants and reclaimed water treatment: Control chloride ion levels to prevent equipment corrosion and pipeline network impact.

• Power plant boiler water and desulfurization systems: Monitor chloride ion accumulation to ensure safe equipment operation.

Wiring & Installation

Installation Notes: The sensor must not be installed upside down or horizontally. It should be installed at least tilted more than 15° to ensure normal seepage of reference solution and stable electrode operation.

Electrical Connection (5-core shielded cable):

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

• Black wire → Ground (GND)

• Blue wire → 485A

• Green wire → 485B

• Yellow wire → Current output (optional, can be left floating if not used)

FAQ

Q1. What are the two models of the NBL-WQ-CLI-4 series? How to select?

Divided into 4A type (POM+ABS) and 4S type (POM+316L). 4A type is recommended for conventional media, and 4S type is recommended for strong corrosive or high salinity environments.

Q2. What output methods does the sensor support?

Standard RS-485 Modbus RTU protocol, and optional 4-20mA current output, compatible with mainstream PLC, DCS and IoT systems.

Q3. What is the service life of the chloride ion electrode?

Adopts patented reference solution slow seepage design with stable reference system. Electrode life is significantly longer than ordinary industrial electrodes, depending on the use environment and maintenance.

Q4. What is the calibration method? Is frequent calibration required?

Supports two-point calibration (zero point + slope). It is factory calibrated. It is recommended to calibrate only when the measurement error exceeds the range. Allow 5 minutes standing for stability after each calibration.

Q5. Are there special requirements for installation angle?

Must be installed at an angle greater than 15°. It must not be installed upside down or horizontally to ensure normal operation of the reference system.

Q6. How to maintain the electrode daily?

Power on and soak in tap water for 24 hours for activation before first use; clean with deionized water and keep dry daily; avoid contact with silicone grease and long-term immersion in distilled water.

Q7. Are there interfering ions for the sensor?

Main interfering ions include sulfide ions, iodide ions, bromide ions, etc. Actual application needs to be evaluated in combination with on-site water quality.

Q8. What is the product warranty period?

One year warranty for the whole machine from the date of sale. The electrode, as a consumable, has a six-month warranty. Damage caused by improper use is not covered.

Summary

NiuBoL NBL-WQ-CLI-4 online chloride ion sensor provides professional and reliable online chloride ion monitoring means for industrial water treatment, environmental governance and seawater utilization projects with its patented solid membrane electrode, high-stability reference system, wide pH adaptation range and IP68 protection design. It helps engineering teams accurately master key chloride ion parameters, effectively prevent corrosion risks, optimize process control, and reduce overall operation and maintenance costs.

Need chloride ion sensor selection advice, Modbus register address table, on-site installation guidance or successful application cases? Feel free to contact the NiuBoL technical support team. We will provide you with complete and professional water quality ion monitoring solutions.

NBL-WQ-CLI-4 Online Chloride ion Sensor Data Sheet

NBL-WQ-CLI-4 Online Chloride ion Sensor.pdf