NBL-CLI-206A Online Chloride Ion Sensor: Solid-state Membrane Ion Selective Electrode, RS-485 Modbus/RTU

NBL-CLI-206A Online Chloride Ion Sensor Product Overview

The NiuBoL NBL-CLI-206A online chloride ion sensor is an integrated ion selective electrode sensor that uses solid-state membrane technology to quickly and accurately measure free chloride ion concentration in water. The sensor has a built-in high-stability reference system and automatic temperature compensation function, and can directly output digital signals to meet the needs of industrial sites for continuous online monitoring of chloride ions.

The sensor has a compact structure, convenient installation and simple maintenance. It is particularly suitable for deployment by system integrators and engineering contractors in sewage treatment, environmental monitoring and industrial process control systems. NiuBoL focuses on providing highly reliable industrial IoT water quality sensor solutions to help users achieve precise data collection, process optimization and environmental compliance.

NBL-CLI-206A Online Chloride Ion Sensor Core Advantages

1. Patented Reference System and High Stability: It adopts a patented chloride ion electrode with internal reference liquid pressure of at least 100KPa (1Bar). The reference system is stable through slow seepage of the microporous salt bridge, and the electrode life is significantly better than ordinary industrial electrodes. Combined with automatic temperature compensation (Pt1000), it effectively reduces the impact of temperature fluctuations on measurement results.

2. High Precision and Wide Range Measurement: Two range options are provided (0～3500mg/L, resolution 0.1mg/L; 0～35000mg/L, resolution 1mg/L), with accuracy of ±5%, supporting two-point calibration to meet precise monitoring needs in different concentration scenarios.

3. Strong Protection and Durability: IP68 protection rating, POM housing material is corrosion-resistant, working pressure ＜0.2MPa, working temperature -5～65℃. It is suitable for submerged installation or pipe/tank installation, and adapts to freshwater, seawater and various industrial media (pH 2～12).

4. Low Power Consumption and Anti-interference Capability: Power consumption is only 0.2W@12V. The low-energy design facilitates remote or distributed deployment. RS-485 bus output follows Modbus/RTU protocol, with strong anti-interference ability for digital signal transmission, ensuring stable long-distance communication.

5. Installation and Maintenance Optimization: 3/4-inch NPT thread interface supports submerged installation. The installation angle must be ≥15° (inverted or horizontal placement is not allowed). Maintenance operations are simple, with clear electrode cleaning and calibration procedures, reducing long-term operation and maintenance costs.

These advantages enable the NBL-CLI-206A to maintain data consistency in complex water quality environments, significantly simplifying system integration work and meeting the requirements of engineering projects for reliability and economy.

Technical Specifications

Note: The sensor has been calibrated before leaving the factory. It is not recommended to calibrate casually unless necessary. Interfering ions include sulfide ions, iodide ions, bromide ions, etc.

NBL-CLI-206A Online Chloride Ion Sensor Application Scenarios

1. Industrial Wastewater Treatment: Wastewater treatment systems in chemical, metallurgical, printing and dyeing industries to monitor chloride ion concentration in real time, optimize treatment processes and ensure compliant discharge.

2. Municipal Wastewater Treatment Plants: Chloride ion monitoring at inlet and outlet to assist process adjustment and prevent high-salt wastewater from affecting biological treatment systems.

3. Seawater Desalination and Seawater Utilization: Seawater desalination plants and coastal industrial cooling water systems to monitor chloride ion levels and ensure equipment operation safety and water quality control.

4. Drinking Water Sources and Water Supply Systems: Chloride ion monitoring at water sources and pipe networks to assess risks of saltwater intrusion or pollution and ensure water supply quality safety.

5. Chemical Process Control: Precise control of chloride ion concentration in reaction media in process flows involving chloride production to improve product quality and process safety.

6. Environmental Monitoring Stations: Long-term online monitoring of chloride ions in rivers, lakes and groundwater to support salt pollution assessment and ecological protection.

It can be combined with other NiuBoL ion or water quality sensors to form a multi-parameter water quality monitoring platform.

Installation and Wiring

Installation Requirements

• Use 3/4-inch NPT thread for submerged installation or pipe/tank installation.

• During installation, the sensor must not be placed upside down or horizontally. It must maintain at least a 15° tilt angle to ensure the electrode membrane head is properly submerged.

Electrical Wiring (Standard 4-core Cable)

• Red wire: Power positive (12～24VDC)

• Black wire: Ground (GND)

• Blue wire: RS-485 A

• White wire: RS-485 B

After wiring, please carefully check to avoid wiring errors. When the cable is immersed in water (including seawater) for a long time or exposed to air, all wiring points must be waterproofed, and cables with certain corrosion resistance (outer diameter Φ6mm) should be selected. Confirm the wiring is correct before powering on to ensure equipment safety.

NBL-CLI-206A Online Chloride Ion Sensor Maintenance Guide

Before use, remove the electrode head protection cap and avoid touching the sensitive membrane head with fingers. First immerse the electrode front end in deionized water for 10 minutes, then immerse in diluted chloride ion solution for 2 hours to activate. For long-term storage, keep the electrode dry and place it in a protection bottle; before use, it is recommended to soak in tap water for 24 hours. Before testing, check whether the wiring terminals are dry. If there is dirt, wipe with absolute ethanol.

Avoid long-term immersion in distilled water or protein solutions. Do not contact with silicone grease. If measurement error occurs after long-term use, calibrate according to the two-point calibration method (zero point and slope). Use standard solutions for calibration (factory optional 100mg/L and 1000mg/L or 1000mg/L and 10000mg/L standard solutions). If calibration still fails after maintenance, the electrode may have failed and should be replaced.

FAQ

Q1: Is the NBL-CLI-206A suitable for seawater environments?

A: Yes. The POM housing and IP68 protection support long-term immersion in seawater, but attention should be paid to range selection for high chloride ion concentrations and regular electrode status checks.

Q2: How to integrate with PLC or DCS systems?

A: The sensor uses RS-485 Modbus/RTU protocol and can be directly connected to most industrial controllers. NiuBoL provides protocol documents and integration guidance for system integrators to quickly access.

Q3: What are the angle requirements for sensor installation?

A: During installation, it must maintain at least a 15° tilt angle. Inverted or horizontal placement is not allowed to ensure normal operation of the electrode reference system.

Q4: What is the impact of interfering ions on measurement?

A: Sulfide ions, iodide ions, bromide ions, etc. will cause interference. In actual applications, it is recommended to evaluate based on water quality composition and take pretreatment measures when necessary.

Q5: How to determine the calibration frequency?

A: The sensor has been calibrated before leaving the factory. Frequent calibration is not recommended unless necessary. Two-point calibration can be performed according to the requirements of the competent authority or actual measurement error.

Q6: Does the cable length support customization?

A: Yes, the standard length is 5 meters and can be customized according to project requirements. Please specify the length when ordering and pay attention to waterproof and corrosion-resistant requirements.

Q7: How is electrode life guaranteed?

A: The patented reference system (internal reference liquid pressure ≥100KPa) significantly extends electrode life. Correct maintenance and avoiding improper use can further improve the service life.

Q8: What to do when the measured value deviates greatly?

A: First check whether the electrode membrane head is clean, the wiring is reliable, and the temperature compensation is normal. If problems still exist after calibration with standard solution, please contact technical support for troubleshooting or electrode replacement.

Summary and Cooperation Invitation

The NiuBoL NBL-CLI-206A online chloride ion sensor provides a stable, reliable and economical solution for industrial online chloride ion monitoring with its patented reference system, high-precision measurement, automatic temperature compensation and excellent RS-485 integration capability. It helps system integrators and engineering contractors achieve precise process control, environmental compliance and water quality safety management, reducing overall operation and maintenance costs.

If your project involves industrial wastewater treatment, seawater desalination, water supply pipe network monitoring or chemical process control, please feel free to contact the NiuBoL professional team. We can provide selection suggestions, calibration solution support and system integration assistance according to specific working conditions. Scan the contact information on the page or visit the NiuBoL official website to obtain the complete product manual, standard solution configuration guidance and typical application cases, and jointly build an efficient and intelligent industrial IoT water quality monitoring system.

NBL-CLI-206A online chloride ion sensor Data Sheet

NBL-CLI-206A online chloride ion sensor.pdf