NBL-WQ-GA-4 Online Calcium Ion Sensor | PVC Membrane Calcium Ion Selective Electrode | Calcium Ion Monitoring

NiuBoL NBL-WQ-GA-4 online calcium ion sensor adopts patented PVC membrane calcium ion selective electrode with automatic temperature compensation. It is specially designed for industrial circulating water, boiler water treatment, environmental monitoring and process control, providing high-stability, high-precision and low-maintenance real-time online calcium ion measurement solutions to help system integrators and engineering contractors accurately control water hardness and scaling risks.

Precise Monitoring of Calcium Ion Concentration in Water to Effectively Prevent Scaling Risks and Water Hardness Issues

In industrial circulating cooling water, boiler feedwater and municipal water treatment processes, uncontrolled calcium ion concentration often leads to equipment scaling, pipeline blockage, reduced thermal efficiency and increased maintenance costs. NiuBoL NBL-WQ-GA-4 split-type online calcium ion sensor effectively solves problems of traditional electrodes such as fast drift, short lifespan and complex integration through patented stable electrode system and industrial-grade design, providing reliable data support for long-term continuous operation.

Three Core Advantages

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

• High Precision Automatic Compensation: Automatic Pt1000 temperature compensation, two-point calibration method, ensuring accurate and reliable measurement results.

• Industrial Protocol Easy Integration: Supports RS-485 (Modbus RTU protocol) and optional 4-20mA output, fast access to PLC, DCS, SCADA and IoT systems.

NBL-WQ-GA-4 Online Calcium Ion Sensor Overview

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

The product is divided into two versions: NBL-WQ-GA-4A (POM+ABS economic type) and NBL-WQ-GA-4S (POM+316L corrosion-resistant type), adapting to different media environments. IP68 protection rating combined with 3/4 NPT installation interface makes it suitable for submersible, pipeline and tank installation. Built-in automatic temperature compensation function effectively eliminates the influence of temperature fluctuations on measurement accuracy, meeting the stringent requirements for data stability and continuity in industrial sites.

NBL-WQ-GA-4 Online Calcium Ion Sensor Key Advantages

1. Patented Calcium Ion Selective Electrode
       Adopts patented calcium ion electrode. The internal reference solution seeps out extremely slowly through the microporous salt bridge under ≥100KPa pressure, forming a stable reference system. Electrode life is far longer than ordinary industrial electrodes, greatly reducing replacement frequency and long-term operation & maintenance costs.

2. High Precision Measurement Performance
       Provides two range options: 0～100 mg/L and 0～1000 mg/L. Resolution 0.01 mg/L (low range), accuracy ±10% of reading or ±1 mg/L, temperature accuracy ±0.5℃, response time T90＜60s, meeting the precision requirements of most water treatment projects.

3. Rugged Protection and Material Adaptation
       IP68 protection rating supports long-term immersion use. 4A type is suitable for conventional environments, 4S type adopts 316L stainless steel shell, more suitable for 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 and reducing engineering implementation difficulty.

5. Simple and Economical Maintenance
       Supports two-point calibration (zero + slope) with matching standard calibration solutions. Clear electrode activation, cleaning and maintenance guidelines are provided. Daily maintenance is simple and suitable for on-site operation teams.

NBL-WQ-GA-4 Online Calcium Ion Sensor Technical Specifications

Applications

• Industrial circulating cooling water systems: Real-time monitoring of calcium ion concentration to guide scale inhibitor dosing and prevent heat exchanger scaling.

• Boiler feedwater and water treatment: Control inlet water calcium hardness to reduce boiler scaling risk and ensure safe and efficient equipment operation.

• Municipal sewage treatment and reuse: Monitor calcium ion levels in reclaimed water to optimize subsequent treatment processes.

• Environmental water quality monitoring: Used for background monitoring of calcium ions in rivers, lakes and groundwater to support water environment assessment.

• Agricultural irrigation and greenhouse planting: Control calcium ion content in nutrient solutions or irrigation water to prevent physiological disorders and improve crop quality.

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 twisted shielded cable):

• Red wire → Power positive (12～24VDC)

• 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 NBL-WQ-GA-4? How to choose?

Divided into 4A type (POM+ABS) and 4S type (POM+316L). 4A type is recommended for conventional water quality, 4S type is recommended for more corrosive media.

Q2. What output methods does the sensor support?

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

Q3. How is the calcium ion electrode service life guaranteed?

Patented reference solution slow seepage design makes the reference system stable. Electrode life is significantly better than ordinary industrial electrodes, depending on medium conditions and maintenance.

Q4. What is the calibration method and frequency recommendation?

Adopts two-point calibration (zero + slope). Factory calibrated. It is not necessary to calibrate frequently when water quality is stable. Regular verification is recommended when there are large changes.

Q5. What are the installation angle requirements?

Must be installed at an angle greater than 15°. Must not be installed upside down or horizontally. This is a necessary condition to ensure normal operation of the reference system.

Q6. How to activate a new electrode and perform daily maintenance?

New electrode needs to be soaked in tap water for 24 hours for activation; clean with deionized water daily; store dry and with protection cap when not in use for a long time.

Q7. What is the working pH and temperature range of the sensor?

Recommended working temperature 0～40℃, pH 4～10. Best measurement performance is obtained within this range.

Q8. What is the product warranty policy?

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-GA-4 online calcium ion sensor provides a professional and reliable online monitoring tool for industrial water treatment, boiler systems and environmental engineering with its patented high-stability electrode, precise temperature compensation, IP68 protection design and open Modbus protocol. It helps engineering teams effectively prevent scaling risks, optimize water treatment processes and reduce overall operation and maintenance costs.

Need calcium ion sensor selection advice, Modbus register address table, calibration operation guidance or typical project application cases? Feel free to contact the NiuBoL technical support team. We will provide you with comprehensive and professional water quality ion monitoring solutions.

NBL-WQ-GA-4 Online Calcium ion Sensor Data Sheet

NBL-WQ-GA-4 Online Calcium ion Sensor.pdf