Reliable Conductivity Measurement for Pure Water Applications

The CLS15E is developed for applications where conductivity measurement accuracy is critical, especially in low conductivity water environments.

It is commonly used in systems where water quality needs to be monitored continuously, including pure water and ultrapure water treatment processes.

Designed for Low Conductivity Measurement

The sensor is optimized for low conductivity ranges:

• 
  Cell constant k=0.01: 0.04 to 20 μS/cm
  
• 
  Cell constant k=0.1: 0.10 to 200 μS/cm
  

This makes it suitable for monitoring applications where small changes in conductivity can indicate changes in water quality or process conditions.

Memosens 2.0 Digital Technology

With Memosens 2.0, the CLS15E stores important sensor information including calibration and adjustment data.

This allows easier sensor replacement, improved process transparency and supports predictive maintenance strategies.

Suitable for Demanding Water Treatment Systems

The CLS15E is widely used in:

• 
  Boiler feedwater monitoring
  
• 
  Reverse osmosis systems
  
• 
  Ion exchanger monitoring
  
• 
  Distillation systems
  
• 
  Cooling water applications
  

Its robust design also allows use in hazardous areas with appropriate approvals.

Flexible Installation and Long Service Life

The sensor is available with different process connections and installation options, including threaded and clamp versions.

Its electropolished stainless steel electrodes and durable construction help maintain stable performance during long-term operation.

Key Features

• 
  Digital conductivity sensor
  
• 
  Designed for pure and ultrapure water applications
  
• 
  Memosens 2.0 digital technology
  
• 
  2-electrode conductive measuring principle
  
• 
  Measuring range:
  
  
  0.04 to 20 μS/cm (k=0.01)
  
  
  0.10 to 200 μS/cm (k=0.1)
  
  
  
• 
  Electrode material: stainless steel 1.4435
  
• 
  Electrode design: electropolished coaxial electrodes
  
• 
  Integrated Pt1000 temperature sensor
  
• 
  Process temperature:
  
  
  Up to 100°C with fixed cable
  
  
  Up to 120°C with plug-in head
  
  
  Sterilization up to 140°C for 30 minutes
  
  
  
• 
  Process pressure:
  
  
  Up to 13 bar at 20°C
  
  
  Up to 2 bar at 120°C
  
  
  
• 
  IP68 protection
  
• 
  Hazardous-area versions available
  
• 
  Suitable for pure water and ultrapure water measurement
  

Typical Applications

Boiler Feedwater Monitoring

Used to monitor conductivity changes in boiler feedwater systems, helping maintain water quality and protect equipment.

Reverse Osmosis Systems

Suitable for conductivity monitoring before and after RO treatment processes.

Ion Exchanger Systems

Used to monitor water quality during ion exchange processes.

Distillation Systems

Provides continuous conductivity measurement for distilled water quality monitoring.

Cooling Water Systems

Suitable for monitoring conductivity changes in industrial cooling water systems.

FAQ

What is the Endress+Hauser CLS15E?

The CLS15E is a digital conductivity sensor designed for pure and ultrapure water applications with Memosens 2.0 technology.

What does CLS15E measure?

The CLS15E measures electrical conductivity of liquids, mainly for low conductivity water applications.

What is the measuring range of CLS15E?

Depending on the cell constant, the measuring range is:

• 
  0.04 to 20 μS/cm
  
• 
  0.10 to 200 μS/cm
  

Is CLS15E suitable for ultrapure water?

Yes. The CLS15E is designed for pure and ultrapure water applications, including boiler feedwater, reverse osmosis and distillation systems.

Does CLS15E use Memosens?

Yes. CLS15E uses Memosens 2.0 digital technology for storing calibration data and improving sensor management.

Can CLS15E be used in hazardous areas?

Yes. Versions with hazardous-area approvals such as ATEX and FM are available depending on configuration.