Memosens/Liquiline analysis measuring points have revolutionised operation and maintenance in the field of liquid analysis and achieved success on the market for 10 years.

The Memosens/Liquiline story began in 1999 with the idea of revolutionising traditional connection and transmission technologies in water analysis. After five years of research and development, sensors with Memosens technology were introduced, followed a year later by Liquiline transmitters, which can now utilise all of the advantages of Memosens. As part of their anniversary celebrations, Endress+Hauser has published a list of the most common applications of the most common applications of the Memosens technology and the three best-selling Liquiline transmitters over the last decade.

The revolution in liquid analysis
Since the early days of pH value measurement, there have been several stages of development that have contributed to improvements to the technology used for process measurement as part of a system. The market launch of Memosens technology by Endress+Hauser in the spring of 2004 saw the beginning of a success story that has since become a de facto industry standard. These new sensors became the first to facilitate the storage of important data directly in the sensor.

One in two devices sold today is fitted with Memosens technology. Memosens is synonymous with digitising the measuring values directly in the sensor head, contactless digital signal transmission and storage of all sensor-related data directly in the sensor. The Memosens range, which includes sensors and parameters as well as suitable transmitters matched to industry requirements, is under continuous further development. Complete measuring points with Memosens technology are now available for all relevant parameters.

In 2005, the measuring point is able to display all of the advantages of Memosens technology for the first time with the introduction of the new Liquiline transmitter. The new Liquiline M CM42 two-wire transmitter for pH, conductivity and oxygen measurement offers unparalleled ease of use. The large plain-text display shows the measuring values in 28 mm size, allowing them to be read without difficulty. Menu-guided operation takes the user through the configuration step by step. This virtually eliminates operational errors.

Outstanding technology
Product quality, environmental protection and safety are some of the many reasons that make the analysis of liquids so important. Better, more accurate and traceable measurements add considerable value to many applications. Memosens and Liquiline ensure that factors such as moisture and temperature no longer cause the measuring values to be distorted or the measurement to fail completely during day-to-day analysis of all kinds of liquids.

•  Incorrect measuring values are a thing of the past, as contactless digital transmission of measuring values provides protection from the adverse effects of moisture, corrosion and salt bridges, and disruptions to the signal transmission are actively reported.

•  EMC safety is guaranteed thanks to galvanic isolation of medium and transmitter.

•  Operation is user-friendly thanks to laboratory calibration under optimal conditions, rotation-proof bayonet lock and automatic sensor detection in the transmitter using true plug-and-play.

•  Operating costs are reduced because sensor replacement using pre-calibrated sensors minimises process downtime and periodic regeneration extends the service life of the sensor.

•  The system offers the very finest in data management, as storage of calibration, sensor and process data makes process management more accurate and optimises maintenance strategies (predictive and preventive maintenance).

More than one supplier for a new standard
Even outstanding technology cannot evolve into a standard if it is provided by just one company. With Memosens, the picture is different. To start with, Knick and Endress+Hauser merged. As partners, they defined the core objectives of their collaboration as further development of the technology and the implementation of an open industry standard based on the existing Memosens protocol, along with a guarantee that their users would receive universal and widely compatible technology based on Memosens. The technology was also made available to other manufacturers in order to establish an open standard at a wider level with Memosens. The major market players Endress+Hauser, Knick, Hamilton and SI Analytics are now working together to jointly establish the new standard in the field of analytical instrumentation.

Current product highlights
Memosens and Liquiline have undergone continuous development since 2005. Today, Memosens includes sensors with an inductive plug-in head and fixed-cable sensors with the Memosens protocol for all relevant liquid analysis parameters.

The Liquiline range now includes transducers for all sectors, from the one-channel device for simple applications, to the two-wire transmitter for hygienic or hazardous areas, up to the multi-channel, multi-parameter transducer.

Liquiline CM44R, launched in the middle of 2013, is one of the newest Memosens technology products. It offers the full performance of a field device packaged in a small, compact case. Samplers and analysers also share the same operating concept, and they can be fitted with Memosens sensors. For example, the Liquiline System CA80 ammonium analyser has been available since April 2014, combining low-maintenance wet-chemical analysis with Memosens sensor measurement for the first time, and the Liquiline to Go multi-parameter handheld measuring device has been providing accurate process information anytime, anywhere since June 2015.

The road is a long one
In order for a new technology to be implemented in the field of analytical instrumentation, it has to cover the main parameters used in the industry.

The foundations have been laid and the portfolio continues to grow. In this way, the Liquiline Memosens platform will lighten the workload of increasing numbers of users in the field of liquid analysis and improve the safety of their processes.

Aeration basins:
In sewage treatment plants the focus is on the protection of downstream waters. The biological stage in which the decomposition of harmful substances and nutrients occurs is of particular importance in this process. This biological stage is extremely energy-intensive and uses up to 70 per cent of the total energy requirements of a plant. This is due to the oxygen blowers used in sludge activation. In order to control the blower on the basis of its load and therefore conserve energy, reliable measurement of the oxygen content and the ammonium load is required. This is where the undisrupted digital data transmission feature of the Memosens technology and the capacity to connect all the required sensors to just one multi-channel transmitter prove their worth.

One of the most important measuring points in a sewage treatment plant is located directly at the inlet. This is because countermeasures can only be taken against harmful substances if they are detected early here. By using the Liquistation CSF48 sampler together with Memosens sensors, it is possible to carry out event-driven sampling subject to the pH value and conductivity. This enables sewage treatment plant operators to react quickly to the changing properties of the inlet water and, for example, divert some of the water to a holding tank so that it can be added in batches to less contaminated inlet water.

Desalination of seawater to obtain drinking water is of increasing importance. This industry has enormous potential for growth. So far, the most efficient method of desalinating seawater is reverse osmosis. Regular measurements of the salt content, which can easily be determined from the conductivity parameter, are required for monitoring the individual stages in the desalination plant and checking efficiency. Memosens sensors specially designed for measurements in the pure and ultrapure water sector are used for this purpose. They provide the excellent measurement accuracy required and at the same time ensure process safety and plant availability.



                Liquiline M CM42 one-channel transmitter                                                        Orbisint CPS11D digital pH sensor