Endress+Hauser CPS171D Specifications
TI01254C/07/EN/02.18
71399701
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Technical Information
Memosens CPS171D
pH electrodes for bioreactors with digital
Memosens technology
For biotechnology production processes with ion
trap for long-term stable reference
Application
Hygienic and sterile applications (sterilizable, autoclavable)
• Bioreactor/fermenter
• Biotechnology
• Pharmaceutical industry
• Foods
With ATEX/IECEx, FM, CSA, NEPSI, FDA and USP approval for use in hazardous
areas.
Your benefits
• Biocompatibility with regard to cytotoxicity and bioreactivity has been tested
successfully
• Documentation to certify compliance with requirements of pharmaceutical
industry with serial number of sensor (optional)
• Durable inscription on shaft, verified as non-cytotoxic
• Suitable for CIP/SIP cleaning, autoclavable, up to 140 °C (284 °F) depending on
version
• Pressurized reference, specially for fermentation processes
• Integrated pressure indicator
• Long-term stable reference with ion trap, resulting in a very long service life,
bridging electrolyte free of silver ions
• No change in color of gel
• Ceramic diaphragm
• Integrated temperature sensor for effective temperature compensation
• No materials derived from animals were used in the manufacture of parts in
contact with the process media
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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
Memosens CPS171D
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Function and system design
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 delivers an electrochemical potential that depends on 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 CPS171D
• Transmitter, e.g. Liquiline M CM42, CM44x/R
• Memosens data cable CYK10
• Assembly, e.g. Unifit CPA442
A0028291
1 Example of a measuring system for pH measurement
1 Installation assembly Unifit CPA442
2 pH electrode CPS171D
3 Memosens data cable CYK10 for Memosens sensors
4 Transmitter Liquiline M CM42
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Memosens CPS171D
Communication and data processing
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
– Hours of operation under extreme conditions
– Number of sterilizations
– Resistance of glass membrane
Display the data listed above with Liquiline CM42, CM44x/R and Memobase Plus CYZ71D.
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Memosens CPS171D
Dependability Reliability
Easy handling
Sensors with Memosens technology have integrated electronics that store calibration data and other
information (such as 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 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, such
as Memobase Plus CYZ71D,. Thus, the current application of the sensors can be made to depend
on their previous history.
Integrity
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
Safety
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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