Orbisint CPS12 / CPS12D / CPS13

2

Endress+Hauser

Function and system design

Measuring principle

Redox measurement

The redox potential is a unit of measurement for the state of equilibria between oxidising and reducing

components of a medium. Redox potential is measured similarly to the pH value. A platinum or gold electrode

is used instead of pH-sensitive membrane glass. Analog to the pH measurement, an integrated Ag/AgCl

reference system is used as a reference electrode.

General properties

• Low maintenance

The dirt-repellent, sterilisable PTFE ring diaphragm of the CPS12 prevents blocking and assures long-time

stability and accuracy.

• Long service life

The double junction system of the metal lead offers better protection from electrode poisons and guarantees

a considerably longer service life.

• Durability

Depending on the ordered version, the electrode is pressure proof up to 16 bar / 232 psi and can be applied

at temperatures of up to 135 °C / 275 °F.

Important properties CPS12D

Maximum process safety

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 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" 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 value in the sensor and transfers it to the transmitter via a

contactless connection. 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.

• The digital signals are suitable for application in hazardous areas; the integrated electronics are intrinsically

safe.

Easy handling

Sensors with Memosens technology have integrated electronics that allow for saving calibration data and

further information such as total hours of operation and operating hours at very high temperatures. When the

sensor is mounted, the calibration data are automatically transferred to the transmitter and used to calculate

the current redox potential. Storing the calibration data in the sensor allows for calibration and adjustment

away from the measuring point. The result:

• The sensors can be calibrated unter optimum external conditions in the measuring lab. Wind and weather

do neither affect the calibration quality nor the operator.

• The measuring point availability is dramatically increased by the quick and easy replacement of precalibrated

sensors.

• The transmitter does not need to be installed close to the measuring point but can be placed in the control

room.

• 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 on external data carriers and evaluation programs at any time. Thus,

the current application of the sensors can be made to depend on their previous history.

Communication with the transmitter

Always connect the digital sensor to a digital transmitter with Memosens technology. Data transmission to an

analog transmitter is not possible.