Endress+Hauser CCS120D Specifications
TI01444C/07/EN/01.19
71436390
2019-01-31
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Technical Information
CCS120D
Digital sensor with Memosens technology for
determining total chlorine
CCS120D offers high-precision measurement with
long-term stability to guarantee optimum process
monitoring.
Application
Memosens CCS120D measures total chlorine in:
• Wastewater treatment plants
– Disinfection monitoring and control in wastewater outlet
– Reuse of outlet water
• Utilities of all industries
All disinfection measuring points
Your benefits
• Easy handling thanks to Memosens digital technology
• Enables predictive maintenance due to storage of sensor and process-specific data
• Low maintenance thanks to fast exchange of membrane cap and electrolyte
• Flexible installation in CYA112 immersion assembly or CCA250 flow assembly
• Easy combination with other relevant parameters of liquid analysis thanks to
connection to the Liquiline multichannel transmitter
Other advantages of Memosens technology
• Maximum process safety
• Data security thanks to digital data transmission
• Very easy to use as sensor data saved in the sensor
• Recording of sensor load data in the sensor enables predictive maintenance
Function and system design
CCS120D
Measuring principle
Mode of operation
Total chlorine levels are determined in accordance with the amperometric measuring principle.
In this context, the following compounds are referred to collectively as total chlorine:
• Free available chlorine: hypochlorous acid (HOCl), hypochlorite ions (OCl-)
• Combined chlorine (chloramines)
• Organic combined chlorine, e.g. cyanuric acid derivatives
Chloride (Cl-) is not recorded.
The sensor is a membrane-covered, two-electrode sensor. A platinum working electrode is used as
the working electrode. A counter electrode coated in silver halide is used as the counter and
reference electrode.
The membrane cap, which is filled with electrolyte, constitutes the measuring chamber. The
measuring electrodes are immersed in the measuring chamber. The measuring chamber is separated
from the medium by means of a microporous membrane. The chlorine compounds contained in the
medium diffuse through the sensor membrane.
The constant polarization voltage present between the two electrodes causes the electrochemical
reaction of the chlorine compounds at the working electrode. Electron donation at the working
electrode and electron acceptance at the counter-electrode cause a current to flow. In the operational
range of the sensor, this current flow is proportional to the chlorine concentration under constant
conditions and is only slightly pH-dependent in the case of this sensor type. The transmitter uses the
current signal to calculate the measured variable for concentration in mg/l (ppm).
The sensor consists of:
• Membrane cap (measuring chamber with membrane)
• Sensor shaft with counter-electrode with large surface area and a working electrode embedded in
plastic
The electrodes are in an electrolyte which is separated from the medium by a membrane. The
membrane prevents the electrolyte from leaking and protects against contaminant penetration.
The measuring system is calibrated by means of a colorimetric comparison measurement in
accordance with the DPD method for total chlorine. The calibration value determined is entered in
the transmitter.
Cross-sensitivities
Measuring system
1)
Oxidants, such as bromine, iodine, ozone, chlorine dioxide, permanganate, peracetic acid and
hydrogen peroxide result in higher readings than expected.
Reducing agents, such as sulfides, sulfites, thiosulfates and hydrazine, result in lower readings than
expected.
A complete measuring system comprises:
• CCS120D disinfection sensor (membrane-covered)
• Flexdip CYA112 immersion assembly
• Measuring cable CYK10, CYK20
• Transmitter, e. g. Liquiline CM44x with firmware version 01.06.08 or higher or CM44xR with
firmware version 01.06.08 or higher
• Optional: extension cable CYK11
• Optional: Flowfit CCA250 flow assembly (a pH/ORP sensor can additionally be installed here)
1) The listed substances have been tested individually and in different concentrations. A reaction to a mixture of substances was not tested.
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1 Example of a measuring system
1 CYH112 holder, main pipe
2 Transmitter
3 Protective cover
4 CYH112 holder, transverse pipe
5 Hook-and-loop tape
6 CYA112 assembly (gray background)
7 Disinfection sensor CCS120D (membrane-covered, ⌀25 mm)
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MEMO SENS
Dependability Reliability
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2 Example of a measuring system
1 Liquiline CM44x transmitter
2 Power cable for transmitter
3 Disinfection sensor CCS120D (membrane-covered, ⌀25 mm)
4 Flowfit CCA250 flow assembly
5 Inlet to Flowfit CCA250 flow assembly
6 Proximity switch (optional)
7 Measuring cable CYK10
Memosens
Memosens makes your measuring point safer and more reliable:
• Non-contact, digital signal transmission enables optimum galvanic isolation
• Dust- and waterproof (IP 68)
• Sensor can be calibrated in a lab, thus increasing the availability of the measuring point in the
process
• Predictive maintenance thanks to recording of sensor data, e.g.:
– Total hours of operation
– Hours of operation with very high or very low measured values
– Hours of operation at high temperatures
– Calibration history
Maintainability
Easy handling
Sensors with Memosens technology have integrated electronics that store calibration data and other
information (e. g. total hours of operation or operating hours under extreme measuring conditions).
Once the sensor has been connected, the sensor data are transferred automatically to the transmitter
and used to calculate the current measured value. As the calibration data are stored in the sensor,
the sensor can be calibrated and adjusted independently of the measuring point. The result:
• Easy calibration in the measuring lab under optimum external conditions increases the quality of
the calibration.
• Pre-calibrated sensors can be replaced quickly and easily, resulting in a dramatic increase in the
availability of the measuring point.
• Thanks to the availability of the sensor data, maintenance intervals can be accurately defined and
predictive maintenance is possible.
• The sensor history can be documented on external data carriers and in evaluation programs,.
• Thus, the current application of the sensors can be made to depend on their previous history.
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