Optical Measurement for Water Quality Monitoring
The CAS51D provides continuous measurement of important water quality parameters including:
Nitrate
SAC
COD equivalent
TOC equivalent
BOD equivalent
DOC equivalent
This makes it suitable for applications where operators need real-time information about organic load or nutrient levels in water treatment processes.
Chemical-Free and Low-Maintenance Operation
Unlike traditional laboratory analysis methods, the CAS51D performs measurement directly in the process using optical technology.
The sensor requires no chemical reagents and is designed for continuous operation with reduced maintenance requirements, helping improve process efficiency and reduce operating costs.
Designed for Drinking Water and Wastewater Applications
The CAS51D is widely used in water treatment applications including:
Drinking water monitoring
Wastewater treatment plants
Biological treatment processes
Nitrate monitoring in aeration basins
Denitrification process control
Effluent monitoring
It helps operators optimize treatment processes through continuous measurement instead of relying only on periodic laboratory sampling.
Memosens Digital Technology
With Memosens digital technology, the CAS51D stores sensor information and calibration data directly in the sensor.
This simplifies commissioning, maintenance and sensor replacement while improving measurement data reliability.
Flexible Installation Options
The CAS51D can be installed directly in the process or used with flow assemblies for extractive measurement.
Available installation methods include:
Immersion installation
Flow cell installation
Sample-based measurement systems
This allows flexible integration into different water treatment systems.
Key Features
Digital optical nitrate and SAC sensor
Measures nitrate, SAC and related sum parameters
UV photometric measurement principle
Chemical-free measurement technology
Memosens digital communication
Measuring range:
Nitrate: 0.01 to 20 mg/l NO₃-N / 0.1 to 50 mg/l NO₃-N
SAC: 0 to 50 / 250 / 1000 1/m
CODₑq: 0 to 75 / 375 / 1500 mg/l
TOC/DOCₑq: 0 to 30 / 150 / 600 mg/l
Process temperature: 5 to 50°C
Sensor diameter: 40 mm
Sensor material: 316L stainless steel
Protection rating: IP68
Supports immersion and flow-cell installation
Suitable for drinking water, wastewater and utilities
Typical Applications
Drinking Water Treatment
Used for monitoring nitrate levels and water quality changes in drinking water production.
Wastewater Treatment
Suitable for monitoring:
Inlet and outlet organic load
Nitrate removal processes
Biological wastewater treatment
Denitrification stages
Industrial Water Management
Used in industrial utilities where continuous monitoring of water quality parameters is required.
Process Optimization
Helps operators optimize treatment processes through continuous measurement of nitrate and organic load indicators.
FAQ
What is the Endress+Hauser CAS51D?
The CAS51D is a digital optical sensor for measuring nitrate, SAC and related water quality parameters in drinking water, wastewater and utility applications.
What parameters can CAS51D measure?
Depending on the selected version, CAS51D can measure:
Nitrate
SAC
COD equivalent
TOC equivalent
BOD equivalent
DOC equivalent
Does CAS51D require chemical reagents?
No. The CAS51D uses optical UV measurement technology and does not require chemical reagents during operation.
What is the measuring principle?
The CAS51D uses UV photometric measurement to determine nitrate and SAC values.
What industries use CAS51D?
Typical applications include:
Drinking water plants
Wastewater treatment plants
Industrial utilities
Surface water monitoring
Does CAS51D support Memosens?
Yes. The CAS51D uses Memosens digital technology for secure data management and easier maintenance.
