Real-Time Nutrient Monitoring for Wastewater
The Memosens CAS41E is designed for continuous monitoring of nutrient parameters in biological wastewater treatment. It provides online measurement of ammonium and nitrate, helping operators monitor nitrification and denitrification processes directly in the treatment process.
Rather than relying on periodic laboratory sampling, the sensor provides continuous process information that can be used for more responsive aeration and treatment control.
One Sensor, Multiple Measurement Options
The CAS41E uses a modular design with three configurable electrode slots. Depending on the selected configuration, the sensor can combine measurement and compensation electrodes for ammonium, nitrate, potassium or chloride.
This gives the sensor flexibility when the monitoring requirements change without requiring a completely different sensor platform.
Designed for Biological Wastewater Treatment
The main application is municipal wastewater treatment, particularly aeration tanks. The sensor can also be used in selected industrial wastewater treatment and surface water monitoring applications.
Smart Calibration and Easier Maintenance
CAS41E supports smart multipoint in-process calibration with automated evaluation and self-assessment. Individual electrodes can also be replaced, helping simplify maintenance and keep the measurement system operating without unnecessary sensor replacement.
Compact Memosens 2.0 Technology
The sensor uses Memosens 2.0 digital technology and is designed for direct in-process installation. Its fully sealed construction supports real-time measurement in the treatment process while keeping the sensor system compact.
Key Features
Digital multiparameter ISE sensor
Continuous ammonium and nitrate measurement
Optional potassium or chloride measurement
Up to three configurable electrode slots
Memosens 2.0 digital technology
Smart multipoint in-process calibration
Replaceable individual electrodes
Direct in-process installation
Measuring range:
Ammonium: 0–1000 mg/l NH4-N
Nitrate: 0–1000 mg/l NO3-N
Potassium: 1–1000 mg/l
Chloride: 1–1000 mg/l
Process temperature 2–40°C
Maximum permitted process overpressure 500 mbar
Immersion depth up to 5 m
Diameter 82 mm
Typical Applications
Municipal wastewater treatment
Biological wastewater treatment
Aeration tank monitoring
Nitrification control
Denitrification control
Industrial wastewater treatment
Surface water monitoring
Ammonium monitoring
Nitrate monitoring
Nutrient-based aeration optimization
FAQ
What does the Endress+Hauser CAS41E measure?
The CAS41E continuously measures ammonium and nitrate. Depending on the selected electrode configuration, it can also measure potassium or chloride.
Is CAS41E a pH sensor?
No. CAS41E is an ion-selective electrode (ISE) multiparameter sensor. Its electrode system can include a pH/reference electrode as part of the measurement configuration, but the primary measurement task is nutrient monitoring.
Where is CAS41E mainly used?
It is primarily designed for biological wastewater treatment, especially aeration tanks in municipal wastewater treatment plants. Selected industrial wastewater and surface-water applications are also possible.
Can CAS41E measure ammonium and nitrate at the same time?
Yes. The modular electrode arrangement allows ammonium and nitrate measurement to be combined in one sensor, with compensation electrodes used as required by the selected configuration.
What is the measuring range of CAS41E?
The official measuring ranges are 0–1000 mg/l NH4-N for ammonium and 0–1000 mg/l NO3-N for nitrate. Potassium and chloride are specified from 1–1000 mg/l.
How does CAS41E reduce maintenance work?
Individual electrodes can be replaced separately, while smart multipoint in-process calibration supports sensor optimization without interrupting the process.
What is the maximum immersion depth?
The official specification lists an immersion depth of up to 5 m.
What transmitter is used with CAS41E?
CAS41E is a digital Memosens sensor and is intended for integration with compatible Liquiline measurement and transmitter systems. The exact transmitter should be selected according to the required measurement configuration.
