
Specs at a glance
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Measurement range
Trace: 0 to 5 mg/l HOCl
Standard: 0 to 20 mg/l HOCl
High: 0 to 200 mg/l HOCl -
Process temperature
0 to 55 °C (32 to 130 °F), non-freezing
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Process pressure
Max. 1 bar (max. 14.5 psi)
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Measuring method
Closed, membrane covered measuring cell
Reduction of free chlorine at the cathode
Field of application
Memosens CCS51D is a robust, low-maintenance sensor for free chlorine. It provides high-precision measurement with long-term stability in drinking water, pool and process water and ensures consistent disinfection monitoring even at low water volumes. The free chlorine sensor features extremely fast response times guaranteeing efficient process control and safe processes. Thanks to Memosens digital technology, CCS51D combines maximum process and data integrity with simple operation.
Memosens CCS51D is a free chlorine sensor for skid builders and end customers. It measures reliably in:
Drinking water - to ensure reliable disinfection
Process water - for hygienic and safe packaging and bottling of products
Utilities - to detect the absence or presence of free chlorine
Pool water - to dose disinfectant efficiently
Benefits
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The right sensor version for every application: From trace measurement up to free chlorine concentrations of 200 mg/l.
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Fast response time (t90 < 25 s) provides an accurate process view and enables prompt reaction to process changes as well as efficient process control.
Increased process safety: precise and long-term stable measurement ensures consistent process monitoring and allows for individually adapted disinfectant dosing.
The low-maintenance, amperometric sensor reduces the cost of ownership of the measuring point, particularly compared to colorimetric measuring systems.
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More process up-time thanks to fast sensor exchange: pre-calibrate the sensor in your lab and then swap it into your process with plug & play.
Connection to the Liquiline multiparameter transmitter allows for easy combination with other relevant parameters of liquid analysis such as pH and ORP.
Videos
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Memosens converts the measured value to a digital signal and transfers it to the transmitter without a contacting connection. This video shows how Memosens optimizes process control and maintenance.
Extended selection
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High-end products
- Highly functional and convenient
Technical excellence
Simplicity

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Standard products
- Reliable, robust and low-maintenance
Technical excellence
Simplicity
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Specialized products
- Designed for demanding applications
Technical excellence
Simplicity
Variable
FLEX selections | Technical excellence | Simplicity |
---|---|---|
Fundamental selection Meet your basic measurement needs |
Technical excellence
|
Simplicity
|
Lean selection Handle your core processes easily |
Technical excellence
|
Simplicity
|
Extended selection Optimize your processes with innovative technologies |
Technical excellence
|
Simplicity
|
Xpert selection Master your most challenging applications |
Technical excellence
|
Simplicity
Variable |
Predecessor
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Measuring principle
Free chlorine
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Application
Ensuring reliable disinfection in drinking water
Process water
Dosing disinfectant efficiently in pool water
Detect the absence or presence of free chlorine in Utilities
Guarantee food safety and provide hygienic packaging and bottling -
Characteristic
Amperometric measurement of dissolved free chlorine
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Measurement range
Trace: 0 to 5 mg/l HOCl
Standard: 0 to 20 mg/l HOCl
High: 0 to 200 mg/l HOCl -
Measuring method
Closed, membrane covered measuring cell
Reduction of free chlorine at the cathode -
Design
Closed amperometric 2-electrode measuring cell with PVDF membrane
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Material
Sensor shaft: POM
Membrane: PVDF
Membrane cap: PVDF
Sealing ring: FKM -
Dimension
Diameter: 25 mm (0.98 inch)
Length: 161 mm (6.34 inch) -
Process temperature
0 to 55 °C (32 to 130 °F), non-freezing
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Process pressure
Max. 1 bar (max. 14.5 psi)
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Temperature sensor
10k NTC integrated (Memosens)
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Connection
Inductive, digital connection head with Memosens
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