TI01423C/07/EN/01.18
71426484
2018-09-20
Products
Solutions Services
Technical Information
Memosens CCS51D
Digital sensor with Memosens technology for
determining free chlorine
Memosens CCS51D offers high-precision
measurement with long-term stability to
guarantee optimum process monitoring
Application
Memosens CCS51D is a free chlorine sensor for skid builders and end customers. It
measures reliably in:
• Drinking water - to ensure reliable disinfection
• Food - to guarantee food safety and provide hygienic packaging and bottling
• Utilities - to detect the absence or presence of free chlorine
• Pool water - to dose disinfectant efficiently
Your benefits
• The right sensor version for every application: From trace measurement up to free
chlorine concentrations of 200 mg/l.
• 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.
• 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.
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
Memosens CCS51D
Measuring principle
Function
Measuring system
Free chlorine levels are determined using hypochlorous acid in accordance with the amperometric
measuring principle.
The hypochlorous acid (HOCl) contained in the medium diffuses through the sensor membrane and
is reduced to chloride ions (Cl-) at the gold cathode. At the silver anode, silver is oxidized to silver
chloride. Electron donation at the gold cathode and electron acceptance at the silver anode causes a
current to flow which is proportional to the concentration of free chlorine in the medium at constant
conditions.
The concentration of hypochlorous acid depends on the pH value. An additional pH measurement is
used to compensate for this dependency.
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 anode with large surface area (counter-electrode) and a cathode embedded in
plastic (working electrode)
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 free chlorine. The calibration value determined is entered in the
transmitter.
A complete measuring system comprises:
• Disinfection sensor CCS51D (membrane-covered, ⌀25 mm) with corresponding
installation adapter
• Flowfit CCA250 flow assembly
• Measuring cable CYK10, CYK20
• Transmitter , e. g. Liquiline CM44x or CM44xR
• Optional: extension cable CYK11
• Optional: Immersion assembly Flexdip CYA112
• Optional: proximity switch
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Memosens CCS51D
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MEMO SENS
A0007341
1 Example of a measuring system
1 Liquiline CM44x transmitter
2 Power cable for transmitter
3 Disinfection sensor CCS51D (membrane-covered, ⌀25 mm)
4 Flowfit CCA250 flow assembly
5 Inlet to Flowfit CCA250 flow assembly
6 Proximity switch (optional)
7 CPS31D pH sensor
8 Measuring cable CYK10
Dependability Reliability
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
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Memosens CCS51D
GN/YE
YE
GN
BN
WH
GND
+
–
Com A
Com B
GY
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.
Safety
Data security thanks to digital data transmission
Memosens technology digitizes the measured values in the sensor and transmits the data to the
transmitter via a non-contact connection that is free from potential interference. The result:
• Automatic error message if sensor fails or connection between sensor and transmitter is
interrupted
• Immediate error detection increases measuring point availability
Input
Measured variables
Measuring ranges
Signal current
Electrical connection
Free chlorine (HOCl)
[mg/l, μg/l, ppm, ppb]
Temperature [°C, °F]
CCS51D-**11AD
0 to 5 mg/l (ppm) HOCl
CCS51D-**11BF 0 to 20 mg/l (ppm) HOCl
CCS51D-**11CJ 0 to 200 mg/l (ppm) HOCl
CCS51D-**11AD
33 to 63 nA per 1 mg/l (ppm) HOCl
CCS51D-**11BF 9 to 18 nA per 1 mg/l (ppm) HOCl
CCS51D-**11CJ 9 to 18 nA per 1 mg/l (ppm) HOCl
Power supply
The electrical connection to the transmitter is established using measuring cable CYK10 or CYK20.
A0024019
2 Measuring cable CYK10/CYK20
To extend the cable, use measuring cable CYK11. The maximum cable length is 100 m (328 ft).
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3 Electrical connection, M12 plug
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Memosens CCS51D
Performance characteristics
Reference operating conditions
Response time
Measured value resolution of sensor
Measured error
1)
Repeatability
Temperature 20 °C (68 °F)
pH value pH 5.5 ±0.2
Flow 40 to 60 cm/s
HOCl-free base medium Mains water
T90 < 25 s (after completing polarization)
The T90 time can be longer under certain conditions. If the sensor is operated or stored in a
chlorine-free medium for a longer period, the sensor response starts immediately if chlorine is
present but only reaches the exact concentration value after a delay.
CCS51D-**11AD
0.03 µg/l (ppb) HOCl
CCS51D-**11BF 0.13 µg/l (ppb) HOCl
CCS51D-**11CJ 1.1 µg/l (ppb) HOCl
±2 % or ±5 µg/l (ppb) of value measured (depending on which value is higher)
LOD (limit of detection)
LOQ (limit of quantification)
CCS51D-**11AD 0.002 mg/l (ppm) 0.005 mg/l (ppm)
CCS51D-**11BF 0.002 mg/l (ppm) 0.007 mg/l (ppm)
CCS51D-**11CJ 0.008 mg/l (ppm) 0.027 mg/l (ppm)
CCS51D-**11AD
0.0031 mg/l (ppm)
CCS51D-AA11BF 0.0035 mg/l (ppm)
CCS51D-AA11CJ 0.062 mg/l (ppm)
Nominal slope
Long-term drift
Polarization time
Operating time of the electrolyte
CCS51D-**11AD
CCS51D-**11BF 14 nA per 1 mg/l (ppm) ClO
CCS51D-**11CJ 14 nA per 1 mg/l (ppm) ClO
48 nA per 1 mg/l (ppm) ClO
2
2
2
< 1 % per month (mean value, determined while operating at varying concentrations and under
reference conditions)
Initial commissioning
60 min
Recommissioning 30 min
at maximum concentration and 55 °C
60 days
at 50 % of measuring range and 20 °C 1 year
at 10 % of measuring range and 20 °C 2 years
1) Based on ISO 15839. The measured error includes all the uncertainties of the sensor and transmitter (measuring chain). It does not contain all
the uncertainties caused by the reference material and adjustments that may have been performed.
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Installation
15°
15°
B
A
Memosens CCS51D
Orientation
Do not install upside-down!
Install the sensor in an assembly, support or appropriate process connection at an angle of at
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least 15 ˚ to the horizontal.
Other angles of inclination are not permitted.
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Follow the instructions for installing the sensor in the Operating Instructions of the assembly
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used.
A Permitted orientation
B Incorrect orientation
A0034236
Immersion depth
Installation instructions Installation in Flowfit CCA151 flow assembly
77 mm (3.03 in)
The disinfection sensor (membrane-covered, ⌀25 mm) is designed for installation in the
Flowfit CCA151 flow assembly if the pH value for compensation is provided in another way.
Please note the following during installation:
The flow rate must be at least 5 l/h (1.32 gal/h).
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If the medium is returned to an overflow basin, pipe or similar, the resulting counterpressure on
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the sensor must not exceed 1 bar (14.5 psi) and must remain constant.
Avoid negative pressure at the sensor, e.g. due to medium being returned to the suction side of a
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pump.
To avoid buildup, heavily contaminated water should also be filtered.
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Preparing assembly
1. The assembly is supplied to the customer with a union nut screwed onto the assembly: unscrew
union nut from assembly.
A0034262
4 Flowfit CCA151 flow assembly
1 Union nut
2. The assembly is supplied to the customer with a dummy plug inserted in the assembly: remove
dummy plug from assembly.
Equip sensor with adapter
The required adapter (clamping ring, thrust collar and O-ring) can be ordered as a mounted sensor
accessory or as a separate accessory .
1. First slide the clamping ring, then the thrust collar, and then the O-ring from the membrane
cap towards the sensor head and into the lower groove.
A0034247
5 Slide clamping ring (1), thrust collar (2) and O-ring (3) upwards from the membrane cap to
the sensor shaft and into the lower groove.
Installing sensor in assembly
2. Slide sensor with adapter for Flowfit CCA151 into the opening in the assembly.
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3. Screw union nut onto assembly on block.
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6 Flowfit CCA151 flow assembly
1 Disinfection sensor
2 Flowfit CCA151 flow assembly
3 Union nut for securing a disinfection sensor
Memosens CCS51D
A0034261
Installation in Flowfit CCA250 flow assembly
The sensor can be installed in the Flowfit CCA250 flow assembly. It allows a pH and ORP sensor to
be installed, in addition to the chlorine or chlorine dioxide sensor. A needle valve regulates the flow
in the range of 30 to 120 l/h (7.9 to 30 gal/h).
Please note the following during installation:
The flow rate must be at least 30 l/h (7.92 gal/h). If the flow drops below this value or stops
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completely, this can be detected by an inductive proximity switch and used to trigger an alarm
with locking of the dosage pumps.
If the medium is returned to an overflow basin, pipe or similar, the resulting counterpressure on
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the sensor must not exceed 1 bar (14.5 psi) and must remain constant.
Negative pressure at the sensor e.g. due to medium being returned to the suction side of a pump,
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must be avoided.
Equip sensor with adapter
The required adapter can be ordered as a mounted sensor accessory or as a separate accessory.
1. Slide adapter for Flowfit CCA250 from the sensor head up to the stop on the sensor.
7 Slide on adapter for Flowfit CCA250.
2. Lock the adapter in place using the two studs provided.
For detailed information on "Installing sensor in Flowfit CCA250 assembly", see Operating
Instructions for assembly
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Memosens CCS51D
Installation in other flow assemblies
When using other flow assemblies, please ensure the following:
The flow velocity at the membrane must always be at least 15 cm/s (0.49 ft/s).
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The flow direction is upwards. Transported air bubbles must be removed so that they do not
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collect in front of the membrane.
The flow must be directed to the membrane.
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Installation in Flexdip CYA112 immersion assembly
Alternatively, the sensor can be installed in an immersion assembly with G1 threaded connection,
e. g.
Ensure sufficient flow towards the sensor when using the immersion assembly .
Equip sensor with adapter
The required adapter can be ordered as a mounted sensor accessory or as a separate accessory.
1. Slide adapter for Flexdip CYA112 from the sensor head up to the stop on the sensor.
Ambient temperature range
Storage temperature
Degree of protection
A0034246
8 Slide on adapter for Flexdip CYA112.
2. Lock the adapter in place using the two studs provided.
For detailed information on "Installing sensor in Flexdip CYA112 assembly", see Operating
Instructions for assembly
Environment
-20 to +60 °C (-4 to 140 °F)
Longterm storage Storage up to max 48 h
With electrolyte +0 to 35 °C (32 to 95 °F) (non-freezing) 35 to 50 °C (95 to 122 °F) (non-freezing)
Without electrolyte –20 to 60 °C (–4 to 140 °F)
IP 68 (1.8 m (5.91 ft)) water column over 7 days at 20 °C (68 °F)
Process
Process temperature
Process pressure
+0 to 55 °C (32 to 130 °F), non-freezing
The inlet pressure depends on the specific fitting and installation.
The measurement can take place with a free outlet.
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Memosens CCS51D
161 (6.34)
82 (3.23)
102 (4.02)
126 (4.96)
!25
(0.98)
The medium pressure directly upstream from the sensor membrane must not exceed 1 bar (14.5 psi)
abs.
In terms of sensor condition and performance, it is essential that the flow velocity limits specified
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in the following table be observed.
pH range
Flow
Minimum flow
Dimensions
Flow
velocity
[cm/s]
Minimum 15 30 5 The sensor is suspended freely in the medium;
Maximum 80 145 20
Calibration
Flowfit
CCA250
Flowfit
CCA151
pH 4 to 8
Volume flow [l/h]
FlexdipCYA112
pay attention to the minimum flow velocity of
15 cm/s during installation.
Measurement pH 4 to 9
remains stable for a minimum of 5 l/h (1.32 gal/hr), in the Flowfit CCA151 flow assembly
remains stable for a minimum of 30 l/h (8 gal/hr), in the Flowfit CCA250 flow assembly
remains stable for a minimum of 15 cm/s (0.5 ft/s), e.g. with Flexdip CYA112 immersion assembly
Mechanical construction
A0034238
Approx. 95 g (3.35 oz)
Weight
9 Dimensions in mm (in)
Sensor with membrane cap and electrolyte (without protection cap and without
adapter)
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Memosens CCS51D
Materials
Cable specification
mark
Ex approvals
2)
Sensor shaft PVC
Membrane PVDF
Membrane cap PVDF
Protection cap • Vessel: PC Makrolon (polycarbonate)
• Seal: Kraiburg TPE TM5MED
• Cover: PC Makrolon (polycarbonate)
Sealing ring FKM
max. 100 m (330 ft), incl. Cable extension
Certificates and approvals
Declaration of Conformity
The product meets the requirements of the harmonized European standards. As such, it complies
with the legal specifications of the EU directives. The manufacturer confirms successful testing of the
product by affixing to it the mark.
cCSAus NI Cl. I, Div. 2
This product complies with the requirements defined in:
• UL 61010-1
• ANSI/ISA 12.12.01
• FM 3600
• FM 3611
• CSA C22.2 NO. 61010-1-12
• CSA C22.2 NO. 213-16
• Control drawing: 401204
Product page
Product Configurator
Scope of delivery
Ordering information
www.endress.com/ccs51d
On the product page there is a Configure button to the right of the product image.
1. Click this button.
The Configurator opens in a separate window.
2. Select all the options to configure the device in line with your requirements.
In this way, you receive a valid and complete order code for the device.
3. Export the order code as a PDF or Excel file. To do so, click the appropriate button on the right
above the selection window.
For many products you also have the option of downloading CAD or 2D drawings of the
selected product version. Click the CAD tab for this and select the desired file type using
picklists.
The delivery comprises:
• Disinfection sensor (membrane-covered, ⌀25 mm) with protection cap (ready for use)
• Bottle of electrolyte (50 ml (1.69 fl.oz))
• Replacement membrane cap in protection cap
• Operating Instructions
2) Only if connected to CM44x(R)-CD*
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Memosens CCS51D
Accessories
The following are the most important accessories available at the time this documentation was
issued.
For accessories not listed here, please contact your Service or Sales Center.
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Maintenance kit CCV05
Device-specific accessories
Order according to product structure
• 2 x membrane caps and 1 x electrolyte 50 ml (1.69 fl.oz)
• 1 x electrolyte50 ml (1.69 fl.oz)
• 2 x sealing set
Memosens data cable CYK10
• For digital sensors with Memosens technology
• Product Configurator on the product page: www.endress.com/cyk10
Technical Information TI00118C
Memosens data cable CYK11
• Extension cable for digital sensors with Memosens protocol
• Product Configurator on the product page: www.endress.com/cyk11
Technical Information TI00118C
Memosens laboratory cable CYK20
• For digital sensors with Memosens technology
• Product Configurator on the product page: www.endress.com/cyk20
Flowfit CCA151
• Flow assembly for chlorine dioxide sensors
• Product Configurator on the product page: www.endress.com/cca151
Technical Information TI01357C
Flowfit CCA250
• Flow assembly for chlorine and pH/ORP sensors
• Product Configurator on the product page: www.endress.com/cca250
Technical Information TI00062C
FlexdipCYA112
• Immersion assembly for water and wastewater
• Modular assembly system for sensors in open basins, channels and tanks
• Material: PVC or stainless steel
• Product Configurator on the product page: www.endress.com/cya112
Technical Information TI00432C
Photometer PF-3
• Compact hand-held photometer for determining free available chlorine
• Color-coded reagent bottles with clear dosing instructions
• Order No.: 71257946
Adapter kit CCS5x(D) for CCA250
• Adapter incl. O-rings
• 2 studs for locking in place
• Order No. 71372025
Adapter kit CCS5x(D) for CYA112
• Adapter incl. O-rings
• 2 studs for locking in place
• Order No. 71372026
COY8
Zero-point gel for oxygen and chlorine sensors
• Oxygen-free gel for the validation, calibration and adjustment of oxygen measuring cells
• Product Configurator on the product page: www.endress.com/coy8
Technical Information TI01244C
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