Reliable Online Chlorine Measurement with DPD Method

The Endress+Hauser CA75 is a compact DPD analyzer module designed for continuous monitoring of chlorine concentration in water applications.

It uses the internationally recognized DPD (N,N-Diethyl-p-phenylenediamine) colorimetric method to measure free chlorine or total chlorine with high reliability.

The CA75 is designed for applications where precise chlorine measurement is required to maintain effective disinfection while avoiding excessive chemical dosing.

Designed for Water Disinfection Monitoring

The CA75 provides reliable chlorine analysis for a wide range of water treatment applications.

Typical applications include:

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  Drinking water disinfection monitoring
  
• 
  Wastewater effluent monitoring
  
• 
  Process water quality control
  
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  Food and beverage water systems
  
• 
  Water reuse applications
  
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  Swimming pool water treatment
  

It helps operators maintain appropriate chlorine levels and improve overall process safety.

Standardized DPD Colorimetric Measurement

The CA75 uses the proven DPD method for chlorine analysis.

Advantages include:

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  Officially accepted measurement method
  
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  Reliable free chlorine and total chlorine detection
  
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  Stable measurement performance
  
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  Suitable for regulatory monitoring requirements
  

The analyzer complies with recognized standards including EPA and ISO measurement methods.

Compact Design with Liquiline Integration

The CA75 is designed as a compact analyzer module that connects directly to an Endress+Hauser Liquiline CM44x transmitter.

Benefits include:

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  Space-saving installation
  
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  Easy commissioning
  
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  Digital integration with Liquiline systems
  
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  Flexible expansion with additional Memosens sensors
  

Users can combine chlorine measurement with other liquid analysis parameters such as pH or turbidity within one measurement system.

Low Maintenance Operation

The CA75 is designed to reduce maintenance workload during continuous operation.

Key advantages include:

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  Factory calibration
  
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  No regular calibration requirement
  
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  Adjustable measuring intervals
  
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  Transparent door for quick reagent level inspection
  
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  Easy access to consumables and maintenance components
  

This helps reduce operating costs and simplify analyzer management.

Flexible Communication and System Integration

The CA75 can be integrated into modern automation systems through Liquiline communication capabilities.

Available communication options include:

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  Modbus RTU
  
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  PROFIBUS DP
  
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  EtherNet/IP
  
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  Other fieldbus communication options
  

This enables easy connection to plant control and monitoring systems.

Key Features

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  Online chlorine analyzer module
  
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  Measures free chlorine or total chlorine
  
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  DPD colorimetric measurement technology
  
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  Designed for drinking water, wastewater and process water
  
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  Compatible with Liquiline CM44x transmitter
  
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  Factory calibration for reduced maintenance
  
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  Supports Memosens sensor integration
  
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  Compact modular design
  
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  Reliable disinfection monitoring
  
• 
  Flexible fieldbus communication options
  

Typical Applications

Drinking Water Treatment

The CA75 supports reliable chlorine monitoring in drinking water systems.

Applications include:

• 
  Disinfection control
  
• 
  Chlorine dosing optimization
  
• 
  Water quality monitoring
  

Wastewater Treatment

Used for monitoring chlorine levels in treated wastewater and water reuse systems.

Benefits:

• 
  Effluent quality monitoring
  
• 
  Disinfection process control
  
• 
  Improved treatment reliability
  

Food and Beverage Industry

The analyzer helps monitor chlorine levels in process and utility water.

Typical applications:

• 
  Hygiene water monitoring
  
• 
  Filling process protection
  
• 
  Reverse osmosis membrane protection
  

Industrial Water Systems

Suitable for chlorine monitoring in industrial water circuits.

Applications include:

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  Cooling water systems
  
• 
  Utility water monitoring
  
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  Process protection
  

FAQ

What is Endress+Hauser CA75?

The CA75 is a DPD analyzer module designed for online measurement of free chlorine and total chlorine in water applications.

What does CA75 measure?

CA75 measures chlorine concentration, including free chlorine and total chlorine.

What measurement method does CA75 use?

CA75 uses the DPD (N,N-Diethyl-p-phenylenediamine) colorimetric measurement method.

Does CA75 work independently?

No. The CA75 requires connection to an Endress+Hauser Liquiline CM44x transmitter for operation.

Where is CA75 commonly used?

It is commonly used in drinking water treatment, wastewater treatment, process water monitoring, food and beverage applications and water reuse systems.