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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
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Function and system design
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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
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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
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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
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A0024316
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Orbipore CPS91D and CPS91
32
T [°F]
50 100 150 200 250
230
0
40
80
120
160
203
p [bar]
[psi]
400 20 60 80 110
0
4
6
8
10
2
T [°C]
12
14
A
1
B
15
Environment
Ambient temperature range
Storage temperature
Degree of protection
Process temperature
Process pressure (absolute)
NOTICE
Risk of damage due to frost
The sensor must not be used if the temperature drops below –15 °C (5 °F).
‣
0 to 50 °C (32 to 122 °F)
IP 68: Memosens plug-in head, (10 m (33 ft) water column, 25 °C (77 °F), 45 days, 1 M KCl)
IP 68: TOP68 plug-in head, (1 m (3.3 ft) water column, 50 °C (122 °F), 168 h)
IP 67: GSA plug-in head (with closed connector system)
Process
0 to 110 °C (32 to 230 °F)
1 to 14 bar (15 to 203 psi)
CAUTION
L
Pressurization of sensor due to prolonged use under increased process pressure
Risk of injury from glass breakage
Avoid excessive heating of such sensors if using them under reduced process pressure or under
‣
atmospheric pressure.
When handling such sensors, wear protective goggles and suitable gloves.
‣
Pressure-temperature ratings
A0026066
3 Pressure-temperature ratings
A Application CPS91(D)
B Atmospheric pressure
Minimum conductivity
pH range
Min. 500 μS/cm
0 to 14 pH
NOTICE
Endress+Hauser 5
Risk of damage to electrode
Never use the electrode outside of the listed specifications!
‣
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Design, dimensions CPS91D
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2
3
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Ø 12
(Ø 0.47)
120, 225, 360, 425
(4.72, 8.86, 14.17, 16.73)
50 (1.97)
120, 225, 360, 425
(4.72, 8.86, 14.17, 16.73)
50 (1.97)
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2
3
4
5
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7
8
9
12
(0.47)
Orbipore CPS91D and CPS91
Mechanical construction
A0026015
4 CPS91D with Memosens plug-in head, temperature
sensor
1 Memosens plug-in head, Pg 13.5
2 Viton O-ring with thrust collar
3 Ag/AgCl reference lead - reference
4 Bridging electrolyte gel
5 Ag/AgCl reference lead - pH
6 Compensator
7 Open aperture
8 pH glass membrane
9 Temperature sensor
5 CPS91D-7BTxx
1 Memosens plug-in head, Pg 13.5
2 Viton O-ring with thrust collar
3 Ag/AgCl reference lead - reference
4 Bridging electrolyte gel
5 Ion trap
6 Ag/AgCl reference lead - pH
7 Open aperture
8 pH glass membrane
9 Temperature sensor
A0026016
6 Endress+Hauser
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Orbipore CPS91D and CPS91
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2
3
4
5
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7
8
9
Ø 12
(Ø 0.47)
120, 225, 360, 425
(4.72, 8.86, 14.17, 16.73)
1
2
3
4
5
6
7
8
Ø 12
(Ø 0.47)
120, 225, 360, 425
(4.72, 8.86, 14.17, 16.73)
Design, dimensions CPS91
Weight
Materials
Process connection
Temperature sensor
Plug-in heads
Endress+Hauser 7
A0026014
6 CPS91 with TOP68 plug-in head, temperature
sensor
1 TOP68 plug-in head, ESA, Pg 13.5
2 Viton O-ring with thrust collar
3 Ag/AgCl reference lead - reference
4 Bridging electrolyte gel
5 Ag/AgCl reference lead - pH
6 Compensator
7 Open aperture
8 pH glass membrane
9 Temperature sensor
A0025955
7 CPS91 with GSA plug-in head
1 GSA plug-in head, Pg 13.5
2 Viton O-ring with thrust collar
3 Ag/AgCl reference lead - reference
4 Bridging electrolyte gel
5 Ag/AgCl reference lead - pH
6 Compensator
7 Open aperture
8 pH glass membrane
0.1 kg (0.2 lbs)
Electrode shaft:
Glass to suit process
pH membrane glasses: Type B
Metal lead: Ag/AgCl
Diaphragm: Open aperture junction
Pg 13.5
CPS91D:
NTC30K
CPS91: Pt100, Pt1000
CPS91D:
Memosens plug-in head for digital, non-contact data transmission
CPS91:
ESA: Threaded plug-in head Pg 13.5, TOP68 for electrodes with and without a
temperature sensor, 17 bar abs. (246 psi) overpressure protection (threefold),
Ex
GSA: Threaded plug-in head Pg 13.5 for electrodes without a temperature sensor
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Orbipore CPS91D and CPS91
Reference system
Ex approval for CPS91D
Ex approval for CPS91 (TOP68)
TÜV certificate for Memosens plug-in head
TÜV certificate for TOP68 plug-in head
CPS91D electromagnetic compatibility
BO version: Ag/AgCl reference lead with reference electrolyte
BT version: Ag/AgCl reference lead with ion trap
Certificates and approvals
• ATEX II 1G Ex ia IIC T4/T6 Ga
• FM / CSA Class I Div. 2, in conjunction with Liquiline M CM42 and Mycom S CPM153 transmitters
Hazardous area versions of the digital sensors with Memosens technology are marked by a red-
orange ring in the plug-in head.
• ATEX II 1G Ex ia IIC T4/T6 Ga
• FM Class I Div. 2, in conjunction with Liquiline M CM42 and Mycom S CPM153 transmitters
Pressure resistance 16 bar rel. (232 psi), minimum three times the safety pressure
Pressure resistance 16 bar rel. (232 psi), minimum three times the safety pressure
Interference emission and interference immunity as per EN 61326: 2012
Product page
Product Configurator
Scope of delivery
Ordering information
www.endress.com/cps91d
www.endress.com/cps91
The navigation area is located on the right of the product page.
1. Under "Device support" click "Configure your selected product".
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 at the top of
the screen.
The scope of delivery includes:
• Sensor in the version ordered
• Technical Information
8 Endress+Hauser
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Orbipore CPS91D and CPS91
Accessories
The following are the most important accessories available at the time this documentation was
issued. For accessories not listed here, please contact your service or sales office.
Assemblies
Cleanfit CPA450
• Manual retractable assembly for installing 120 mm sensors in tanks and pipes
• Product Configurator on the product page: www.endress.com/cpa450
Technical Information TI00183C
Cleanfit CPA471
• Compact stainless steel retractable assembly for installation in tanks and pipes, for manual or
pneumatically remote-controlled operation
• Product Configurator on the product page: www.endress.com/cpa471
Technical Information TI00217C
Cleanfit CPA472D
• Robust retractable assembly for pH, ORP and other industrial sensors
• Heavy-duty version made of durable materials
• For manual or pneumatic, remote-controlled operation
• Product Configurator on the product page: www.endress.com/cpa472d
Technical Information TI00403C
Cleanfit CPA472
• Compact plastic retractable assembly for installation in tanks and pipes
• For manual or pneumatic, remote-controlled operation
• Product Configurator on the product page: www.endress.com/cpa472
Technical Information TI00223C
Cleanfit CPA473
• Stainless steel process retractable assembly with ball valve shutoff for particularly reliable
separation of the medium from the environment
• Product Configurator on the product page: www.endress.com/cpa473
Technical Information TI00344C
Cleanfit CPA474
• Plastic process retractable assembly with ball valve shutoff for particularly reliable separation of
the medium from the environment
• Product Configurator on the product page: www.endress.com/cpa474
Technical Information TI00345C
Cleanfit CPA475
• Retractable assembly for pH/ORP measurement in tanks and pipes under sterile measuring
conditions
• Product Configurator on the product page: www.endress.com/cpa475
Technical Information TI00240C
Unifit CPA442
• Installation assembly for food, biotechnology and pharmaceutics
• With EHEDG and 3A certificate
• Product Configurator on the product page: www.endress.com/cpa442
Technical Information TI00306C
Dipfit CPA111
• Immersion and installation assembly made of plastic for open and closed vessels
• Product Configurator on the product page: www.endress.com/cpa111
Technical Information TI00112C
Endress+Hauser 9
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Orbipore CPS91D and CPS91
Dipfit CPA140
• pH/ORP immersion assembly with flange connection for very demanding processes
• Product Configurator on the product page: www.endress.com/cpa140
Technical Information TI00178C
Flowfit CPA240
• pH/ORP flow assembly for processes with stringent requirements
• Product Configurator on the product page: www.endress.com/cpa240
Technical Information TI00179C
Flowfit CPA250
• Flow assembly for pH/ORP measurement
• Product Configurator on the product page: www.endress.com/cpa250
Technical Information TI00041C
Ecofit CPA640
• Set comprising adapter for 120 mm pH/ORP electrodes and sensor cable with TOP68 coupling
• Product Configurator on the product page: www.endress.com/cpa640
Technical Information TI00246C
Cleanfit CPA871
• Flexible process retractable assembly for water, wastewater and the chemical industry
• For applications with standard 12mm sensors
• Product Configurator on the product page: www.endress.com/cpa871
Technical Information TI01191C
Buffer solutions
Measuring cable
Cleanfit CPA875
• Retractable process assembly for sterile and hygienic applications
• For in-line measurement with standard 12 mm sensors for parameters such as pH, ORP and
oxygen
• Product Configurator on the product page: www.endress.com/cpa875
Technical Information TI01168C
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) and to standard reference material of NIST (National
Institute of Standards and Technology) according to DIN 19266 by a DKD (German Calibration
Service) accredited laboratory.
Product Configurator on the product page: www.endress.com/cpy20
CYK10 Memosens data cable
• For digital sensors with Memosens technology
• Product Configurator on the product page: www.endress.com/cyk10
Technical Information TI00118C
CPK9
• Terminated measuring cable for connecting analog sensors with TOP68 plug-in head
• Selection in accordance with product structure
For more information and to order, please contact your sales office.
CPK1
For pH/ORP electrodes with GSA plug-in head
Ordering information is available from your sales office or at www.endress.com.
10 Endress+Hauser
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www.addresses.endress.com
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