Endress+Hauser CCS51D Specifications

TI01423C/07/EN/01.18
71426484
2018-09-20

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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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A0018861

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

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< 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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