Endress+Hauser CPS71D Specifications
TI00245C/07/EN/15.15
71299932
Products Solutions Services
Technical Information
Ceragel CPS71D and CPS71
pH single-rod measuring cells, analog or with
digital Memosens technology
For chemical process, hygienic and sterile
applications with an ion trap for poison-resistant
reference
Application
• Aggressive chemical and hygienic applications
– Chemical industry
– Foods
– Fermenters
– Biotechnology
– Pharmaceutical industry
• Process technology and monitoring of processes with:
– Rapidly changing pH values
– High proportion of electrode poisons such as H2S
With ATEX, FM and CSA approval for use in hazardous areas
Your benefits
• Poison-resistant reference with ion trap, resulting in a very long service life,
bridging electrolyte free of silver ions
• TP version with pressurized reference, for chemical and fermentation processes
• TU version for upside-down installation, solidified gel in the internal reference lead
• Integrated temperature sensor for effective temperature compensation
• Suitable for CIP/SIP cleaning, autoclavable
• Biocompatibility: reference electrolyte with certified non-cytotoxic gel
• Acrylamide-free reference and bridging electrolyte
Other advantages of 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 saved in the sensor
• Recording of sensor load data in the sensor enables predictive maintenance with
the Memobase Plus CYZ71D
Function and system design
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Ceragel CPS71D and CPS71
Measuring principle
Measuring system
pH measurement
The pH value is used as a unit of measurement for the acidity or alkalinity of a liquid medium. The
membrane glass of the electrode supplies an electrochemical potential which is dependent upon the
pH value of the medium. This potential is generated by the selective penetration of H+ ions through
the outer layer of the membrane. An electrochemical boundary layer with an electric potential forms
at this point. An integrated Ag/AgCl reference system serves as the required reference electrode.
The transmitter converts the measured voltage into the corresponding pH value using the Nernst
equation.
A complete measuring system consists of the following components at least:
• pH electrode CPS71D or CPS71
• Transmitter, e.g. Liquiline CM42, CM44x/R, Mycom S CPM153, Liquisys M CPM2x3
• Memosens data cable CYK10 for Memosens sensors or CPK9 for analog sensors
• Immersion, flow or retractable assembly, e.g. Cleanfit CPA871/875
A0025757
1 Example of a measuring system for pH measurement
1 Retractable assembly Cleanfit CPA871
2 pH electrode CPS71D
3 Memosens data cable CYK10
4 Liquiline M CM42 two-wire transmitter for hazardous area
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Ceragel CPS71D and CPS71
Communication and data processing CPS71D
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)
– Temperature offset
– Number of calibrations
– Serial number of the transmitter used to perform the last calibration
• Operating data
– Temperature application range
– pH application range
– Date of initial commissioning
– Maximum temperature value
– Hours of operation under extreme conditions
– Number of sterilizations
– Resistance of glass membrane
You can display the abovementioned data using the Liquiline CM44x, CM42 and Memobase Plus
CYZ71D.
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Dependability
Ceragel CPS71D and CPS71
Reliability
Integrity Data security thanks to digital data transmission
Safety
Easy handling
Sensors with Memosens technology have an integrated electronics unit that stores calibration data
and other information (e.g. total operating hours and 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 .
• Maintenance intervals can be defined based on all stored sensor load and calibration data and
predictive maintenance is possible.
• The sensor history can be documented using external storage media and evaluation programs, e.g.
Memobase Plus CYZ71D. Thus, the current application of the sensors can be made to depend on
their previous history.
Memosens technology digitizes the measured values in the sensor and transmits the data to the
transmitter using 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
Maximum 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:
– Plug-in connection free from corrosion
– Measured values cannot be distorted by moisture.
– Can even be connected under water
• The transmitter is galvanically decoupled from the medium. Issues concerning "symmetrical highimpedance" or "asymmetry" or an impedance converter are a thing of the past.
• EMC safety is guaranteed by screening measures for the digital transmission of measured values.
• Intrinsically safe electronics mean operation in hazardous areas is not a problem.
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Ceragel CPS71D and CPS71
Input
Measured variables
Measuring range
pH value
Temperature
Electrode version TB, TC:
pH: 0 to 14 pH
Temperature: • 0 to 140 °C (32 to 284 °F)
• 0 to 135 °C (32 to 275 °F) for sensors with Ex approval and analog
sensors
Electrode version TP (pressurized reference):
pH: 0 to 12 pH
Temperature: • 0 to 140 °C (32 to 284 °F)
(140 °C (284 °F) only for sterilization)
• 0 to 135 °C (32 to 275 °F) for sensors with Ex approval and analog
sensors
(135 °C (275 °F) only for sterilization)
• Max. 100 °C (212 °F) in continuous operation due to increasing
pressure loss at T > 100 °C (212 °F)
Electrode version TU:
pH: 0 to 14 pH
Temperature: • 0 to 140 °C (32 to 284 °F)
(140 °C (284 °F) only for sterilization)
• 0 to 135 °C (32 to 275 °F) for sensors with Ex approval and analog
sensors
(135 °C (275 °F) only for sterilization)
• Max. 100 °C (212 °F) in continuous operation due to liquefaction of
gel-based inner electrolyte at T > 100 °C (212 °F)
Please note the process operating conditions.
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