TI01493C/07/EN/01.20
71486977
2020-06-29

Products

Solutions

ServicesTechnical Information
Memosens CPS11E
pH sensor for standard applications in process
technology and environmental engineering

Digital with Memosens 2.0 technology
Application• Long-term monitoring and limit control in processes with stable process conditions• Chemical industry: strong acids/bases, plastic, pulp and paper industry• Power plants (e. g. flue gas cleaning), oil and gas• Incinerator plants• Water and wastewater treatment• Boiler feedwater and cooling water• Well water and drinking water• All industrial and municipal treatment plants
With ATEX, IECEx, CSA C/US, NEPSI, Japan and INMETRO approvals for use inhazardous areas Zone 0, Zone 1 and Zone 2.
Your benefits• Low-maintenance and robust thanks to large PTFE ring junction• Can be used at pressures up to 17 bar (246.5 psi) (absolute)• Process glass for standard applications (application A)• Process glass also for highly alkaline applications (application B)• Process glass for applications in media containing hydrofluoric acid (application F)• Integrated NTC 30K temperature sensor for effective temperature compensation• Optional: for media with low conductivity (reference system AS with salt storage)• Optional: Poison-resistant reference with improved ion trap (reference system TA)
Other advantages provided by Memosens technology• Maximum process safety thanks to non-contact, inductive signal transmission• Data security thanks to digital data transmission• Very easy to use as sensor data are saved in the sensor• Predictive maintenance can be performed with the Memobase Plus CYZ71D byrecording sensor load data in the sensor

Memosens CPS11E

Function and system design
Measuring principlepH measurement
The pH value is used as a unit of measurement for the acidity or alkalinity of a medium. The
membrane glass of the electrode delivers an electrochemical potential that depends on the pH valueof the medium. This potential is generated by the selective accumulation of H+ ions on the outerlayer of the membrane. As a result, an electrochemical boundary layer with an electrical potential
difference forms at this point. An integrated Ag/AgCl reference system serves as the requiredreference electrode.
The measured voltage is converted to the corresponding pH value using the Nernst equation.

Measuring system

A complete measuring system consists of the following components at least:• pH sensor CPS11E• Transmitter, e. g. Liquiline CM42, CM44x• Memosens data cable CYK10 or CYK20• Assembly• Immersion assembly, e. g. Dipfit CPA111• Flow assembly, e. g. Flowfit CPA250• Retractable assembly, e. g. Cleanfit CPA871• Permanent installation assembly, e. g. Unifit CPA842
Additional options are available depending on the application:
Automatic cleaning and calibration system, e. g. Liquiline Control CDC904132A0025757

2

1

Example of a measuring system for pH measurement

1234

Retractable assembly Cleanfit CPA871
pH sensor CPS11E
Memosens data cable CYK10
Liquiline M CM42 two-wire transmitter for hazardous areas

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Memosens CPS11E

Communication and dataprocessing

Communication with the transmitter
Always connect digital sensors with Memosens technology to a transmitter with Memosens
technology. Data transmission to a transmitter for analog sensors is not possible.
Digital sensors can store measuring system data in the sensor. These include the following:• Manufacturer data
• Serial number• Order code
• Date of manufacture• Calibration data
• Calibration date
• Slope at 25 °C (77 °F)• Zero point at 25 °C (77 °F)• Offset of integrated temperature sensor• Number of calibrations• Calibration history• Serial number of the transmitter used to perform the last calibration or adjustment• Operating data
• Temperature application range• pH application range• Date of initial commissioning• Maximum temperature value• Hours of operation under extreme conditions• Number of sterilizations• CIP counter• Sensor loadThe data listed above can be displayed with Liquiline CM42, CM44x, and Memobase Plus CYZ71D.

Dependability

Reliability
Easy handlingSensors with Memosens technology have integrated electronics that store calibration data and otherinformation (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 transmitterand 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 ofthe calibration.
• Pre-calibrated sensors can be replaced quickly and easily, resulting in a dramatic increase in theavailability of the measuring point.
• Thanks to the availability of the sensor data, maintenance intervals can be accurately defined andpredictive maintenance is possible.
• The sensor history can be documented on external data carriers and in evaluation programs, e. g.
Memobase Plus CYZ71D.
• The saved application data of the sensor can be used to determine the continued use of the sensor
in a targeted manner.
Interference immunity
Data security thanks to digital data transmission
Memosens technology digitizes the measured values in the sensor and transmits the data to thetransmitter via a non-contact connection that is free from potential interference. The result:• If the sensor fails or there is an interruption in the connection between the sensor and transmitter,
this is reliably detected and reported.
• The availability of the measuring point is reliably detected and reported.

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Memosens CPS11E

SafetyMaximum process safety
With inductive transmission of the measured value using a non-contact connection, Memosens
guarantees maximum process safety and offers the following benefits:• All problems caused by moisture are eliminated:• No corrosion at the connection• Measured values cannot be distorted by moisture• The transmitter is galvanically decoupled from the medium. Issues concerning "symmetrical highimpedance" or "asymmetry" or the type of impedance converter are a thing of the past.
• Electromagnetic compatibility (EMC) is guaranteed by screening measures for the digitaltransmission of measured values.
• Intrinsically safe electronics mean operation in hazardous areas is not a problem. Complete
flexibility thanks to individual Ex approvals for all components, such as sensors, cables andtransmitters.

Input
Measured variable

pH value
Temperature

Measuring range

Application A• pH: 1 to 12• Temperature: –15 to 80 °C (5 to 176 °F)
Application B• pH: 0 to 14• Temperature: 0 to 135 °C (32 to 275 °F)
Application F• pH: 0 to 10• Temperature: 0 to 70 °C (30 to 158 °F)
Pay attention to the operating conditions in the process.

Power supply
Electrical connection

GY GNDYE Com B
GN Com A
WH –BN +EY/NGA0024019

2Measuring cable CYK10 or CYK20‣ Memosens measuring cable, e. g. Connect the CYK10 or CYK20 to the sensor.
For further information on cable CYK10, see BA00118C.

Performance characteristics
Reference system

4Ag/AgCl reference lead, bridge electrolyte: gel KCl, 3M, AgCl-free (reference system TA)

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Memosens CPS11E

InstallationOrientation• Do not install the sensors upside-down.
• The installation angle from the horizontal must be at least 15°.
An installation angle < 15° is not permitted, as otherwise an air bubble will form. Contact between
the membrane glass and the reference lead will then no longer be guaranteed.

A15°

15°
B

A0028039

3A
B

Installation instructions

Installation angle at least 15° from the horizontal
Permitted orientation
Incorrect orientation• Before screwing in the sensor, make sure the assembly thread, the O-rings and the sealing surface
are clean and undamaged and that the thread runs smoothly.
• Pay attention to the installation instructions provided in the Operating Instructions of theassembly used.

‣ Screw in the sensor and tighten by hand with a torque of 3 Nm (2.21 lbf ft) (specifications only
apply if installing in Endress+Hauser assemblies).

For detailed information on removing the moistening cap, see BA01988C

Environment
Ambient temperature range

NOTICE
Risk of damage from frost!
‣ Do not use the sensor at temperatures below –15 °C (5 °F) .

Storage temperature

0 to 50 °C (32 to 122 °F)

Degree of protection

IP 68 (10 m (33 ft) water column, 25 °C (77 °F), 45 days, 1 M KCl)

Electromagnetic
compatibility (EMC)

Interference emission and interference immunity as per EN 61326-1: 2013

Process
Process temperature range

Application A:
Application B:
Application F:

Process pressure range

Applications A and B:
Application F:

Endress+Hauser–15 to 80 °C (5 to 176 °F)
0 to 135 °C (32 to 275 °F)
0 to 70 °C (32 to 158 °F)
0.8 to 17 bar (11.6 to 246.5 psi) absolute
0.8 to 7 bar (11.6 to 101.5 psi) absolute

5Memosens CPS11E

LCAUTION
Pressurization of sensor due to prolonged use under increased process pressure
Possibility of sudden rupture and injury from glass splinters!
‣ Avoid fast heating of these pressurized sensors if they are used under reduced process pressureor under atmospheric pressure.
‣ When handling these sensors, always wear protective goggles and appropriate protective gloves.
Conductivity

Reference system AA, TA:

minimum 50 μS/cm (minimized flow; pressure and temperaturemust be stable)
minimum 0.1 μS/cm (stainless steel flow assembly with grounding;stable and minimized flow; pressure and temperature must bestable)

Reference system AS:

Pressure-temperatureratings[psi] p [bar]261232203
174

181614121451168758

1086429200-15020406080

10012053268104

140176212248Ax[°C]
T[°F]
A0039323-EN

4Ax

Pressure-temperature ratings
Application A
Atmospheric pressure[psi] p [bar]
18261
232
203
174

161412145
116
8758

10864

29200-150204060

80

10012053268104140

176

212248B

Fx[°C]
140 T
[°F]
284
A0039326-EN

5BF
x

6

Pressure-temperature ratings
Application B
Application F
Atmospheric pressure

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Memosens CPS11E

Mechanical construction

50(1.97)50(1.97)

Design, dimensions112
3

120 / 225 / 360 / 425(4.72 / 8.86 / 14.17 / 16.73)

120 / 225 / 360 / 425(4.72 / 8.86 / 14.17 / 16.73)

2
3
45678

4

5678

Ø 12 (0.47)

Ø 12 (0.47)

A0042536

A0042535

Weight6

CPS11E with salt storage. Engineering unit:
mm (in)

12
3
4
56
78

Memosens plug-in head with process connection
O-ring with thrust collar
Reference lead
pH reference lead
Salt storageJunction
Temperature sensor
pH glass membrane712345678

CPS11E with ion trap. Engineering unit: mm (in)Memosens plug-in head with process connection
O-ring with thrust collar
Reference lead
pH reference lead
Ion trap
Junction
Temperature sensor
pH glass membrane

Installed length

120 mm (4.72 in)

225 mm (8.86 in)

360 mm (14.17 in)

425 mm (16.73 in)

Weight40 g (1.4 oz)

60 g (2.1 oz)

90 g (3.2 oz)

100 g (3.5 oz)

MaterialsSensor shaft
pH membrane glass
Metal lead
Aperture
O-ringProcess couplingNameplate

Temperature sensor

NTC 30K

Plug-in head

Memosens plug-in head for digital, non-contact data transmission, pressure resistance
16 bar (232 psi)(relative)

Process connections

Pg 13.5

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Glass to suit process
Type A, B, F
Ag/AgCl
Ring-shaped PTFE diaphragm, sterilizableFKM
PPS fibre-glass reinforced
ceramic metal oxide

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Memosens CPS11E

Certificates and approvals
 markThe 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 theproduct by affixing to it the  mark.

Ex approval

ATEX
II 1G Ex ia IIC T3/T4/T6 Ga
IECEx
Ex ia IIC T3/T4/T6 Ga
NEPSI
Ex ia IIC T3/T4/T6 Ga
CSA C/US• IS Cl. I Div 1, GP A-D Ex ia IIC T3/T4/T6• IS Cl. I Zone 0, AEx ia IIC T3/T4/T6
Japan ExEx ia IIC T3/T4/T6 Ga
INMETROEx ia IIC T3/T4/T6 Ga
Ex versions of digital sensors with Memosens technology are identified by an orange-red ringon the plug-in head.
Pay attention to the instructions for Memosens data cable CYK10 and transmitter CM82.

TÜV certificate for
Memosens plug-in head

Pressure resistance 16 bar (232 psi) relative, minimum three times the safety pressure

EAC

The product has been certified according to guidelines TP TC 004/2011 and TP TC 020/2011 which
apply in the European Economic Area (EEA). The EAC conformity mark is affixed to the product.

Ordering information
Product pagewww.endress.com/cps11e

Product Configurator

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 rightabove the selection window.
For many products you also have the option of downloading CAD or 2D drawings of theselected product version. Click the CAD tab for this and select the desired file type using
picklists.

Scope of delivery

8The delivery comprises:• Sensor in the version ordered• Operating Instructions• Safety instructions for the hazardous area (for sensors with Ex approval)

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Memosens CPS11EAccessories
The following are the most important accessories available at the time this documentation wasissued.

‣ For accessories not listed here, please contact your Service or Sales Center.
Device-specific accessories

Assemblies
Unifit CPA842• Installation assembly for food, biotechnology and pharmaceutics• With EHEDG and 3A certificate• Product Configurator on the product page: www.endress.com/cpa842
Technical Information TI01367C
Cleanfit CPA875• Retractable process assembly for sterile and hygienic applications• For in-line measurement with standard sensors with 12 mm diameter, e.g. for pH, ORP, oxygen• Product Configurator on the product page: www.endress.com/cpa875
Technical Information TI01168C
Dipfit CPA140• pH/ORP immersion assembly with flange connection for very demanding processes• Product Configurator on the product page: www.endress.com/cpa140
Technical Information TI00178C
Cleanfit CPA871• Flexible process retractable assembly for water, wastewater and the chemical industry• For applications with standard sensors with 12 mm diameter• Product Configurator on the product page: www.endress.com/cpa871
Technical Information TI01191C
Cleanfit CPA473• Stainless steel process retractable assembly with ball valve shutoff for particularly reliable
separation of the medium from the environment• Product Configurator on the product page: www.endress.com/cpa473
Technical Information TI00344C
Cleanfit CPA474• Plastic process retractable assembly with ball valve shutoff for particularly reliable separation ofthe medium from the environment• Product Configurator on the product page: www.endress.com/cpa474
Technical Information TI00345C
Dipfit CPA111• Immersion and installation assembly made of plastic for open and closed vessels• Product Configurator on the product page: www.endress.com/cpa111
Technical Information TI00112C
Flowfit CPA240• pH/ORP flow assembly for processes with stringent requirements• Product Configurator on the product page: www.endress.com/cpa240
Technical Information TI00179C
Flowfit CPA250• Flow assembly for pH/ORP measurement• Product Configurator on the product page: www.endress.com/cpa250
Technical Information TI00041C

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9Memosens CPS11E

Ecofit CPA640• Set comprising adapter for 120 mm pH/ORP sensors and sensor cable with TOP68 coupling• Product Configurator on the product page: www.endress.com/cpa640
Technical Information TI00246C
Buffer solutions
High-quality buffer solutions from Endress+Hauser - CPY20
The secondary buffer solutions have been referenced to primary reference material of the PTB(German Federal Physico-technical Institute) or to standard reference material of NIST (NationalInstitute of Standards and Technology) according to DIN 19266 by a laboratory accredited by theDAkkS (German accreditation body) according to DIN 17025.
Product Configurator on the product page: www.endress.com/cpy20
Measuring cableMemosens data cable CYK10• For digital sensors with Memosens technology• Product Configurator on the product page: www.endress.com/cyk10
Technical Information TI00118C
Memosens laboratory cable CYK20• For digital sensors with Memosens technology• Product Configurator on the product page: www.endress.com/cyk20

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