Endress+Hauser CPS341D Specifications
Technical Information
Ceramax CPS341D
Electrode with pH sensitive enamel and digital Memosens technology
Meets highest demands of measuring accuracy, pressure, temperature,
sterility and durability
Application
• Food production, also highly pasty media
• Beverage production and filling
• Quality control
• Pharmaceutical industry:
– Water treatment
– Active ingredient production
– Active ingredient preparation
– Fermentation
– Biotechnology
Your benefits
• Continuous online measurement is possible in the ongoing
process
• Direct installation in container nozzles or piping
• Self-cleaning by the flowing medium
• Long-term stability over many years
• High mechanical loading capacity due to a steel substrate
• Extremely corrosion-resistant to acids
• Hygienic design: Inline CIP and SIP-capable
Further benefits offered by Memosens technology
• Maximum process safety through contactless inductive signal
transmission
• Data safety through digital data transmission
• Easy handling thanks to storage of sensor-specific data in the
sensor
• Predictive maintenance possible thanks to registration of
sensor load data in the sensor
TI468C/07/EN/06.10
71114968
Function and system design
Measuring principle pH measurement
The pH value is a measure of the acid or base character of a medium. Depending on the pH value of the
medium, the electrode's pH-sensitive enamel provides an electrochemical potential. This is the result of H
selectively penetrating the outer layer of the enamel. As a result, an electrochemical boundary layer forms here
with an electric potential. An integrated Ag/AgCl reference system forms the required reference electrode.
The transmitter converts the measured voltage into the corresponding pH value according to the NERNST
equation.
General properties Mechanical stability
The substrate of the sensor is steel. That makes the sensor mechanically stable when confronted with solids
and turbulent flows from agitators. To protect the steel from corrosion and product deposits, it is covered with
highly resistant enamel.
Working electrode
The working electrode consists of yellow, pH-sensitive enamel that is melted onto a large area of the lower end
of the sensor in the shape of a ring. This ensures an area many times larger compared to pH glass electrodes or
ISFET sensors.
The working electrode is connected directly to the metallic reference lead. An inner buffer is not necessary.
Reference electrode
The Ag/AgCl reference electrode is integrated into the head of the sensor. A sterile 3M KCl solution is used as
an electrolyte. This also contains an inhibitor that prevents the reference from aging and thus enables the long
operating life.
The electrolyte CPS341Z-D5 is delivered in PE bottles with septum and simply used in the stainless steel
electrolyte vessel CPS341Z-D1.
The conductive connection between reference and medium guarantees a shrunk, aseptic ground joint
diaphragm.
The pressure in the reference system must be continuously above the operating pressure.
Easy installation
The sensor is installed, without a basket protector or additional assembly, directly in container nozzles or in
the main stream of piping. The orientation can be selected at random.
The sensor remains in the process room permanently, even in empty containers.
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Durability and calibration cycles
Important properties Maximum process safety
Data storage The sensor is connected to the cable connection (CYK10) without contact. The power and data are transferred
The sensor is factory-calibrated and ready for measurement immediately after being connected to a transmitter
with Memosens functionality.
Due to the mechanical design, aging of the sensor is very minor and there is no measuring error.
In most applications it is sufficient for the sensor to be adjusted once a year with a sample calibration.
The inductive and non-contacting measured value transmission of Memosens guarantees maximum process
safety and offers the following benefits:
• All problems caused by moisture are eliminated.
– The plug-in connection is non-contacting and therefore free from corrosion.
– Measured value distortion from moisture is not possible.
– The plug-in system can even be connected under water.
• The transmitter is galvanically decoupled from the medium. The result: No more need to ask about
"symmetrically high-impedance" or "unsymmetrical" (for pH/ORP measurement) or an impedance
converter.
• EMC safety is guaranteed by screening measures for the digital measured value transmission.
Data safety through digital data transfer
The Memosens technology digitalizes the measured values in the sensor and transfers them to the transmitter
contactlessly and free from interference potential. The result:
• An automatic error message is generated if the sensor fails or the connection between sensor and transmitter
is interrupted.
• The availability of the measuring point is dramatically increased by immediate error detection.
Communication with the transmitter
Always connect digital sensors to a transmitter with Memosens technology. Data transmission to a transmitter
for analog sensors is not possible.
inductively
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Once connected to the transmitter, the data saved in the sensor are read digitally. You can call up these data
using the corresponding DIAG menu.
Data that digital sensors save include the following:
• Manufacturer data
– Serial number
– Order code
– Date of manufacture
• Calibration data
– Calibration date
– Calibration values
– Number of calibrations
– Serial number of the transmitter used to perform the last calibration
• Operational data
– Date of commissioning
– Hours of operation under extreme conditions
– Number of sterilizations
– Data for sensor monitoring.
Measuring system A complete measuring system comprises:
• Ceramax CPS341D pH sensor
• Transmitter, e.g. Liquiline CM42
• CYK10 measuring cable
Measuring system
4 CM42 transmitter
3 CYK10 measuring cable
2 CPS341D pH sensor
a0013857
Input
Measured variables pH value
Measuring range 0 to 10 pH (linear range)
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Temperature
-2 to 14 pH (application range)
0 to 140 °C (32 to 280 °F)
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