Endress+Hauser CLS21-C1E4A High-Performance Conductivity Sensor

Endress+Hauser, a global leader in process instrumentation, presents the CLS21-C1E4A, a robust and reliable conductivity sensor engineered for continuous monitoring in harsh industrial environments. This advanced sensor is designed to deliver precise, maintenance-free measurements, making it the ideal choice for water treatment, chemical processing, power generation, and pharmaceutical applications.

Precise and Reliable Measurement Technology

The CLS21-C1E4A utilizes a proven 4-electrode conductivity measurement principle. This intelligent design actively compensates for polarization and fouling effects, ensuring long-term signal stability and high accuracy even in challenging conditions. Its C4A sensor cell geometrywith platinum-coated electrodes provides an excellent measurement range and minimizes sensitivity to flow variations.

Key Technical Parameters & Specifications

• Measurement Principle: 4-electrode contacting conductivity

• Cell Constant: K = 0.1 cm⁻¹ (optimized for low to medium conductivity ranges)

• Measuring Ranges: 0 - 2000 µS/cm (with compatible transmitter)

• Process Temperature: -20 to 130 °C (-4 to 266 °F)

• Process Pressure: Up to 16 bar (232 psi) at 130°C

• Electrode Material: Platinum-coated ceramic

• Process Connection: G1" thread, other options available

• Housing Material: PPSU (Polyphenylsulfone) for excellent chemical resistance

• Cable Connection: Fixed cable (model C1E4A)

• Certifications: ATEX, IECEx, FM, CSA approvals for hazardous areas

Core Advantages of the CLS21-C1E4A Sensor

1. Unmatched Durability & Chemical Resistance: Constructed with PPSU housing and platinum electrodes, the CLS21 withstands aggressive media, high temperatures, and pressures, guaranteeing a long service life and reducing replacement costs.

2. Fouling-Resistant & Low Maintenance: The 4-electrode technology and smooth sensor surface prevent measurement drift caused by coatings or deposits. This translates to fewer calibrations, less maintenance, and higher process reliability.

3. Exceptional Accuracy & Stability: Delivers consistent, precise readings critical for process control, quality assurance, and compliance reporting. Its insensitivity to flow changes ensures reliable data in all installation conditions.

4. Seamless Integration & Global Compliance: Designed to work perfectly with Endress+Hauser transmitters like the Liquiline series. With major international explosion-proof certifications (ATEX, IECEx, FM, CSA), it is approved for use in hazardous areas worldwide.

5. Reduced Total Cost of Ownership: The combination of minimal maintenance, high durability, and accurate process control leads to fewer downtimes, optimized chemical dosing, and significant long-term operational savings.

Ideal Application Areas

The Endress+Hauser CLS21-C1E4A excels in:

• Ultrapure Water Monitoring: In power plants (boiler feedwater) and microelectronics.

• Water & Wastewater Treatment: Control of filtration, neutralization, and desalination processes.

• Chemical Industry: Concentration measurement of acids, alkalis, and process solutions.

• Pharmaceutical & Biotechnology: CIP (Cleaning-in-Place) monitoring and buffer preparation.

For a robust, accurate, and low-maintenance conductivity measurement solution, the Endress+Hauser CLS21-C1E4A sensor sets the industry standard. Its proven performance in demanding conditions ensures process safety, efficiency, and quality.

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