TI01566C/07/EN/02.21
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2021-10-08

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Memosens CPS61E
pH sensor for bioreactors in life sciences and forthe food industry

Digital with Memosens 2.0 technology
For hygienic production processes with ion trap forlong-term stable reference
Application
Hygienic and sterile applications (sterilizable, autoclavable):• Bioreactor/fermenter• Biotechnology• Pharmaceutical industry• Foods
With the following approvals for use in explosive atmospheres in Zone 0, Zone 1 andZone 2: ATEX, IECEx, CSA C/US, NEPSI, JPN Ex, INMETRO.
Your benefits• Biocompatibility with regard to biological reactivity in vitro (cytotoxicity) and invivo successfully tested for the relevant parts in contact with the process medium• Suitable for CIP/SIP cleaning and autoclavable at temperatures up to140 °C (284 °F)• Pressurized reference, specially for fermentation processes (TP reference system)• Alternatively, TU reference system for upside-down installation, solidified gel inthe internal reference lead
• Integrated pressure indicator (TP reference system)• Very long service life thanks to poison-resistant reference with improved ion trap
• Bridging electrolyte free of silver ions, acrylamide-free• Integrated NTC 30K temperature sensor for effective temperature compensation• Parts in contact with the process medium not made from materials derived fromanimals. Minimized TSE/BSE risk in accordance with EMA.
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 by recording sensor load data in thesensor

Memosens CPS61E

Function and system design
Measuring principle

pH measurement
The pH value is used as a unit of measurement for the acidity or alkalinity of a medium. Themembrane 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 comprises:• pH sensor CPS61E• Memosens data cable CYK10 or CYK20• Transmitter, e.g. Liquiline CM44, Liquiline CM42
• Assembly• Retractable assembly, e.g. Cleanfit CPA875• Permanent installation assembly, e.g. Unifit CPA842
Additional options are available depending on the application:
Automatic cleaning and calibration system, e.g. Liquiline Control CDC90

1432A0044431

112
34Communication and dataprocessing

2

Example of a measuring system for pH measurement
Transmitter Liquiline CM44x
Memosens data cable CYK10
pH sensor CPS61E
Permanent installation assembly CPA842

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.

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Memosens CPS61E

Digital sensors can store measuring system data in the sensor. This includes 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 load
The data listed above can be displayed with the Liquiline CM42, CM44x, CM44x/R 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 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.
Integrity
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 CPS61E

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 range M and N• pH: 0 to 14• Temperature: 0 to 100 °C (32 to 212 °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

2

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

Performance characteristics
Reference system

TP reference system:

TU reference system:

Ag/AgCl reference lead with ion trap, reference and bridging
electrolyte 3 M KCl, acrylamide-free, flowable gel electrolyte,pressurized 7 bar (102 psi) (absolute); display via pressure
indicator
Ag/AgCl reference lead with ion trap, reference and bridging
electrolyte 3 M KCl, acrylamide-free, solidified gel electrolyte

Pay attention to the operating conditions in the process.

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Memosens CPS61E

Mounting
Orientation

TP reference system• Do not install the sensor upside-down.
• The angle of inclination 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 reference and membrane glass is then no longer guaranteed.

A15°15°
B

A0028039

3AB

Installation angle at least 15° from the horizontal
Permitted orientation
Forbidden orientation

TU reference system• The sensor is suitable for upside-down installation.
• Install the sensor at any angle.

360°

A0024597

4

Any installation angle

For detailed installation instructions for the assembly: refer to the Operating Instructions of theassembly used.

Installation instructions
1.

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.

2.

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

TP reference system

LCAUTION
Glass sensor with pressurized reference
Possibility of sudden rupture and injury from glass splinters!
‣ Always wear protective goggles when working with these sensors.

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5Memosens CPS61E

For correct pH measurement:
1.

Before commissioning, open the modified atmosphere packaging (MAP) by pulling the red teartab.

2.

Completely remove the MAP.

3.

Remove the moistening cap with the bayonet lock.

4.

Remove the reusable protective netting from the sensor.

5.

For optimum accuracy, insert the sensor into a calibration buffer solution with pH 4 to 9 for
15 to 20 min before calibration.

6.

Put the sensor into operation.
For detailed information on removing the moistening cap, see BA01988C

Hygienic requirements
The following must be observed for easy-to-clean installation that complies with 3-A or EHEDG
requirements:• Use a certified process assembly• Use a process assembly with a protective guard around the sensor to prevent the glass sensors
from breaking in the process• The installation must be self-draining• Dead areas should be avoided

Environment
Ambient temperature rangeNOTICE
Risk of damage from frost!
‣ Do not use the sensor at temperatures below 0 °C (32 °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• EN 61326-2-3:2013• NAMUR NE21:2017

Process
Process temperature range

Application M: 0 to 100 °C (32 to 212 °F)
Up to 130 °C (266 °F) for sterilization
Application N: 0 to 100 °C (32 to 212 °F)
Up to 140 °C (284 °F) for sterilization

Process pressure range

Application M and N

0.8 to 7 bar (11.6 to 101.5 psi) absoluteLCAUTION
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.

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Memosens CPS61EConductivity

Minimum 100 μS/cm (minimized flow; pressure and temperature must remain constant)Pressure-temperature
ratings[psi] p [bar]174

1214511687581086429200N

Ax0204060

80

1001201403268

104

140

176

212248

284

[°C]
T
[°F]
A0044422-EN

5A
N
x

Endress+Hauser

Pressure-temperature diagram
Short periods for SIP and autoclaving for application NApplication M and N
Atmospheric pressure

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Memosens CPS61E

Mechanical construction

50 (1.97)

50 (1.97)

Design, dimensions

1

12120 / 225 / 360 / 425(4.72 / 8.86 / 14.2 / 16.7)

120 / 225 / 360 / 425(4.72 / 8.86 / 14.2 / 16.7)

2345678934567

Ø 11.9 (0.47)

Ø 11.9 (0.47)

A0045225

A0042541

6CPS61E TP reference system. Engineering unit: mm(in)7

CPS61E TU reference system.
Engineering unit: mm (in)123Memosens plug-in head with process connection
O-ring with thrust collar
Pressure indicator with air bubble (only for TP referencesystem)
Ag/AgCl reference lead
Ion trap
Ceramic junction
Temperature sensor
pH inner lead
pH glass membrane1Memosens plug-in head with processconnection
O-ring with thrust collar
Ag/AgCl reference lead with ion trap
Ceramic junction
Temperature sensor
pH inner lead
pH glass membrane

456789Weight234567

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)

Glass to suit process
Type N
Ag/AgCl
Ceramic junction, zirconium dioxide
FKM
PPS fiber-glass reinforced
Ceramic metal oxide

Materials

Sensor shaft
pH membrane glass
Metal lead
Open apertureO-ringProcess coupling
Nameplate

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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Memosens CPS61E

Certificates and approvals
Current certificates and approvals for the product are available via the Product Configurator atwww.endress.com.
1.

Select the product using the filters and search field.

2.

Open the product page.

The Configuration button opens the Product Configurator.

Ordering informationProduct pagewww.endress.com/cps61e

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

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

Accessories
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
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 (NationalEndress+Hauser

9Memosens CPS61E

Institute 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 cable
Memosens 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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