For industrial circulating cooling water systems, chloride ion concentration must be continuously monitored to prevent pitting corrosion and stress corrosion cracking of stainless steel and carbon steel equipment. Our CE, ISO 9001, and RoHS certified online chloride ion analyzer delivers accurate, real-time chloride measurement from 1.8 to 35,500 ppm with ±5% FS accuracy.
What is an Online Chloride Ion Analyzer and Why Does Cooling Water Need It?
An online chloride ion analyzer is a continuous monitoring instrument that uses ion-selective electrode (ISE) technology to measure chloride concentration in water in real time. For circulating cooling water systems, chloride monitoring is not optional—it is a critical corrosion control measure.
Chloride ions are highly penetrative and can easily break through metal surface protective films, causing pitting corrosion and crevice corrosion. Industry standards recommend chloride limits of below 500–750 ppm for circulating cooling water, with stricter limits for stainless steel equipment (≤700 ppm) and carbon steel systems (≤300 ppm). Without continuous monitoring, chloride concentration can gradually rise due to water evaporation and concentration, accelerating equipment corrosion and potentially causing premature failure of heat exchangers, condensers, and piping.
Key Technical Specifications of the ERUN Chloride Ion Analyzer
The instrument features a measurement range of 1.8–35,500 ppm, with a resolution of 0.001 ppm and accuracy of ±5% FS. It operates within a pH range of 2–12 and a temperature range of 0–50.0°C, with automatic temperature compensation ensuring measurement stability across varying conditions. Repeatability is ±3%, and the solid-state membrane sensor provides fast response and long-term stability.
ERUN-C3B Online Chloride Ion Sensor (Flow-through Type) Full Parameters
Parameter Item | Technical Specification |
|---|
Measuring Range | 1.8~35500ppm |
pH Measuring Range | 2~12pH |
Accuracy | ±5%FS |
Resolution | 0.001ppm |
Temperature Measuring Range | 0~50.0℃ |
Sensor Type | Solid-state membrane |
Repeatability | ±3% |
Pressure | 0~1bar |
Housing Material | ABS |
Cable Length | Standard 5m |
Process Connection | M39*1.5 |
Installation Method | Flow-through |
Output | 4~20 mA three-wire system |
Data Communication | RS485 |
Power Supply | DC9~30V |
IP Rating | IP68 |
Product Introduction
This product is a new type of online chloride ion water quality sensor independently developed by ERUN Group.It features high stability and high precision. It can automatically detect temperature and perform automatic temperature compensation, accurately measuring the chloride ion concentration and temperature of the solution.It is widely used for continuous real-time monitoring of chloride ions in drinking water, wastewater, boiler water, aquaculture, and the biological and pharmaceutical industry.
Certifications That Matter for Global Export – CE, ISO 9001, RoHS
For international buyers, regulatory compliance is non-negotiable. This analyzer holds three key certifications:
CE Certification – confirms compliance with EU safety, health, and environmental protection standards
ISO 9001 – certifies that manufacturing follows internationally recognized quality management systems
RoHS Compliance – ensures restriction of hazardous substances, meeting EU environmental requirements
These certifications eliminate trade barriers and provide immediate trust for procurement teams in Europe, North America, and other regulated markets.
Where Is This Chloride Analyzer Used in Cooling Water Systems?
This instrument is widely deployed in industrial circulating cooling water systems, boiler water monitoring, and wastewater treatment. Typical applications include:
Power plant cooling towers – preventing condenser tube corrosion
HVAC central air conditioning systems – controlling pipe corrosion in chilled and cooling water
Petrochemical plant circulating water – monitoring chloride to guide dosing and blowdown optimization
Industrial process water – ensuring equipment longevity and process stability
How Does Chloride Corrosion Damage Cooling Water Equipment?
Chloride ions accelerate corrosion through two primary mechanisms: pitting corrosion and stress corrosion cracking. Stainless steel equipment is particularly sensitive—once chloride concentration exceeds recommended limits, localized corrosion can penetrate tube walls within months, leading to costly unplanned shutdowns and equipment replacement.
Continuous online monitoring provides early warning, enabling operators to adjust blowdown rates or chemical dosing before corrosion damage occurs.
FAQ
Q: What is the measurement range of this chloride ion analyzer?
A: 1.8–35,500 ppm with 0.001 ppm resolution.
Q: What certifications does this product hold?
A: CE, ISO 9001, and RoHS.
Q: What output signals are available for system integration?
A: 4-20 mA three-wire system and RS485 digital communication.
Q: What is the recommended chloride limit for cooling water?
A: Industry standards recommend below 500–750 ppm, with stricter limits for stainless steel (≤700 ppm) and carbon steel (≤300 ppm).
Q: What installation methods are supported?
A: Flow-through installation with M39×1.5 process connection.
Conclusion
For cooling water system operators and plant engineers, continuous chloride monitoring is essential to prevent corrosion damage and extend equipment life. Our CE, ISO 9001, and RoHS certified online chloride ion analyzer provides the accuracy, reliability, and compliance international buyers require. With a wide measurement range, robust IP68-rated sensor, and flexible 4-20 mA/RS485 outputs, it integrates seamlessly into existing control systems.
For detailed specifications, pricing, or customization inquiries, visit the ERUN product page or contact our sales team at nawei@xayingrun.com. Trust ERUN Group for precision water quality instrumentation that meets global standards. 
