Endress+Hauser CPS91D Specifications
TI00375C/07/EN/14.15
71299929
Products Solutions Services
Technical Information
Orbipore CPS91D and CPS91
pH electrodes, analog or with digital Memosens
technology
With open aperture for contaminated media,
optionally available with integrated temperature
sensor for analog sensors
Application
• Chemical processes
• Pulp and paper industry
• Flue gas cleaning
• Contaminated media:
– Solids
– Emulsions
– Precipitation reactions
With ATEX, FM and CSA approval for use in hazardous areas
Your benefits
• Open aperture for use in contaminated media
• Low maintenance thanks to gel filling
• Optional: poison-resistant reference with ion trap
• Long service life thanks to new, stabilized bridging electrolyte gel
• Not affected by fluctuations in pressure and temperature
• Integrated temperature sensor for effective temperature compensation (optional
for CPS91)
Other advantages of Memosens technology
• Maximum process safety
• 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
3
4
1
2
Orbipore CPS91D and CPS91
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 comprises at least the following components:
• pH electrode CPS91D or CPS91
• Transmitter, e.g. Liquiline CM42, CM44x, 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
A0025757
1 Example of a measuring system for pH measurement
1 Retractable assembly Cleanfit CPA871
2 pH electrode CPS91D
3 Memosens data cable CYK10
4 Liquiline M CM42 two-wire transmitter for hazardous area
2 Endress+Hauser
Orbipore CPS91D and CPS91
CPS91D 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
– 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.
Dependability
Reliability
Integrity Data security thanks to digital data transmission
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
Endress+Hauser 3
Orbipore CPS91D and CPS91
15°
15°
A
B
Safety
Measured variables
Measuring range
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.
Input
pH value
Temperature
0 to 14 pH
0 to 110 °C (32 to 230 °F)
Please note the process operating conditions.
Installation instructions
Installation
Do not install the electrodes upside down. The angle of inclination must be at least 15° from the
horizontal. A smaller inclination angle is not permitted as it could cause an air bubble to form in the
glass sphere and prevent the inner electrolyte from completely wetting the pH diaphragm.
NOTICE
Before screwing in the electrode, make sure the threaded connection of the assembly is clean
and runs smoothly.
Screw in the electrode finger-tight (3 Nm)! (Data apply only if installing with Endress+Hauser
‣
assemblies.)
Make sure to follow the installation instructions in the Operating Instructions of the used
‣
assembly.
2 Electrode installation; installation angle at least 15° from the horizontal
A Permitted orientation
B Forbidden orientation
4 Endress+Hauser
A0024316
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