CPS72/CPS72D

2

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.

Communication and data

processing CPS72D

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.

CPS72D dependability

Maximum process safety

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