Endress+Hauser CPS72D Specifications

TI00374C/07/EN/13.13 71212355

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Technical Information

Ceragel CPS72 and CPS72D

ORP electrodes, analog and digital with Memosens technology

For process technology, hygienic and sterile applications with poison-resistant reference with ion trap

Application

• Hygienic and sterile applications (sterilizable, autoclavable) –Fermenters – Biotechnology – Pharmaceutical industry – Food industry

• Process technology and monitoring of processes with: – Rapidly changing ORP measured values – High proportion of electrode poisons such as H

With ATEX, FM and CSA approval for use in hazardous areas

Your benefits

• Certified biocompatibility, no cytotoxicity

• Acrylamide-free bridging electrolyte

• Integrated temperature sensor in the case of Memosens

• Poison-resistant reference with ion trap, resulting in a very long service life

• Bridging electrolyte free of silver ions

• Suitable for CIP/SIP cleaning and autoclavable, depending on version up to 140 ˚C (284 °F)

Function and system design

Measuring principle ORP measurement

The oxidation-reduction potential is an indicator of the equilibrium between oxidizing and reducing substances in the medium. The oxidation-reduction potential is measured with a gold or platinum electrode instead of the pH-sensitive glass membrane. As in the case of pH measurement, an integrated Ag/AgCl reference system is used as the reference electrode.

General characteristics • Short response times

The ceramic junction allows sufficiently fast diffusion of the medium, thereby enabling short response times.

• Long service life

Use of an ion trap as standard ensures that the reference is protected against poisoning, results in a significantly longer service life and guarantees immunity to temperature and pressure fluctuations. The ion trap also effectively prevents the diffusion of silver ions into the bridging electrolyte.

CPS72/CPS72D

Communication and data processing CPS72D

CPS72D dependability Maximum process safety

Measuring system data which digital sensors can save in the sensor include:

• Manufacturer data – Serial number –Order code –Date of manufacture

• Calibration data – Date of calibration – Calibrated offset ("mV" measuring mode) – % slope ("%" measuring mode) – Number of calibrations – Serial number of the transmitter used to perform the last calibration

• Operating data – Temperature application range – ORP area of application – Date of initial commissioning –Operating hours

You can display the data listed above using the Liquiline CM44x or Liquiline M CM42 transmitter.

With its inductive transmission of the measured value via a non-contact plug-in connection, Memosens guarantees maximum process safety and offers the following advantages:

• All problems caused by moisture are eliminated: – The plug-in connection is free from corrosion – Moisture cannot corrupt the measured value – Plug-in system can even be connected under water

• The transmitter is galvanically decoupled from the medium. This means there is no need to choose between "symmetrical high-impedance" or "unsymmetrical" solutions and impedance converters when it comes to pH/ORP measurement.

• EMC safety is guaranteed by screening measures in the digital measured value transmission.

• Can easily be used in hazardous areas thanks to intrinsically safe electronics.

Memosens technology digitizes the measured values in the sensor and transmits them to the transmitter via a non-contact connection in a way that is free from any potential interference. The result:

• Automatic error message generation if the sensor fails or the connection between sensor and transmitter is interrupted

• Immediate error detection increases measuring point availability

CPS72/CPS72D

Ease of use

Sensors with Memosens technology have integrated electronics that save calibration data and other information, such as total hours of operation and operating hours at very high temperatures etc. When the sensor is mounted, the sensor data are automatically sent to the transmitter and used to calculate the current ORP potential. Saving the calibration data makes it possible to calibrate and adjust the sensor irrespective of the measuring point. The result:

• Convenient calibration in the measuring lab under optimum external conditions improves the quality of the calibration.

• Measuring point availability is dramatically increased by the quick and easy replacement of precalibrated sensors.

• Installing the transmitter in the measuring container with integrated measuring devices reduces the amount of fastening material and cabling work required.

• The availability of the sensor data makes it possible to accurately determine the maintenance intervals of the measuring point and enables predictive maintenance.

• The sensor history can be documented with external storage media and evaluation programs. The sensor's field of application can be determined based on its previous history.

Communication with the transmitter

Always connect digital sensors with Memosens technology to a transmitter with Memosens technology. It is not possible to transfer data to a transmitter for analog sensors.

Measuring system A complete measuring system comprises:

• ORP electrode CPS72 or CPS72D

• Transmitter, e.g. Liquiline CM42 or Liquiline CM44x (for CPS72D with Memosens technology)

• Special measuring cable. e.g. CPK9 or Memosens data cable CYK10 for CPS72D

• Immersion, flow or retractable assembly, e.g. Cleanfit H CPA475

Fig. 1: Measuring system for ORP measurement

1 Process assembly Cleanfit H CPA475 2 ORP electrode CPS72 / CPS72D 3 Special measuring cable CPK9 (for electrodes with TOP68 plug-in head) / CYK10 for digital sensors 4 Liquiline CM42 transmitter

a0003706

Input

NOTICE

15°

Measured variables ORP

CPS72/CPS72D

Measuring range

ORP -1500 to 1500 mV Temperature: -15 to 140 ˚C (5 to 284 ˚F)

0 to 135 ˚C (32 to 275 ˚F) for sensors with Ex approval and analog sensors

Pay attention to the application conditions in the process.

Installation

Installation instructions Do not install the electrodes upside down. The inclination angle must be at least 15° from the

horizontal. A smaller installation angle is not permitted as it could cause an air bubble to form, preventing contact between the reference and the reference lead.

Before screwing in, make sure the threaded connection of the assembly is clean and runs smoothly.

‣ Screw in the electrode finger-tight (3 Nm)! (Information valid only when installing in

Endress+Hauser assemblies.)

‣ Also pay attention to the installation instructions provided in the Operating Instructions of the

assembly used.

a0003686

Electrode installation; installation angle at least 15˚ from the horizontal

A Permitted orientation B Forbidden orientation

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