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Test & measurement


Online measured values commonly need verification by grab sample analysis in the laboratory. This is a challenge for many operators and laboratory workers due to measurement discrepancies that arise from different sensors, variable algorithms or varying ambient conditions. The Liquiline Mobile CML18 instrument from Endress+Hauser enables easy and reliable control and verification. Here, Endress+Hauser’s Bo Ottersten provides an overview of the instrument


measurements and keeping the process running under optimised conditions. When grab samples are measured at the sampling point, the values must be documented in one way or another. A paper and a pen have been traditionally used, but this is hardly comfortable or useful. It is better to use the internal memory inside the portable device. Liquiline Mobile has a memory for grab samples taken in the field. The operator simply needs to press the store button and choose the predefined location. Time, date, location and measured values are securely saved. The stored values can then be easily transferred to a smartphone via the SmartBlue app and shared.


CONSISTENT GRAB SAMPLE MEASUREMENT IN THE LABORATORY


Another method of grab sample measurement is bringing a sample from the measuring point to a laboratory or maintenance shop. The challenge of this kind of monitoring is that samples are often not stable over time; the sample changes its values between the time it was taken at the sampling point and when it is analysed in the laboratory, and the sample temperature can influence the sample values. In addition, the use


Instrumentation Monthly October 2020 35


OCCASIONAL OR TEMPORARY MEASUREMENT AT PROCESS POINTS WITH NO ONLINE MEASURING DEVICE


Ensuring the quality of products and processes also requires monitoring in places where no online measurement is installed. In these cases, grab sample analysis is often done in the laboratory, again with a high risk that sample values change due to temperature or contamination. The compact Liquiline Mobile and the robust Memosens sensors are suitable for random measurements in the process because they are easy to carry to any point in the plant and are not affected by wet ambient conditions. If a certain point in the process needs to be monitored over a specific time, customers can easily set up a temporary measurement with Liquiline Mobile, as the integrated data logger can store 10,000 measured values with a date and time stamp. Afterwards, the data can be quickly transferred to a mobile device via the SmartBlue app and exported into a computer as a CSV file.


of different measuring technologies in the lab can often result in deviations between the lab measurement and the measurement recorded in the process. With the Liquiline Mobile CML18, the identical Memosens sensors that are used in the process can also be used in the lab. This guarantees consistency of data between lab and process measurements. In cases requiring a particularly fast response time, the new robust lab pH sensor, the Memosens CPL51E, is the ideal choice. It uses the same Memosens technology as the process sensors but is optimised for a fast response time in sample analysis and laboratory applications that do not require a high degree of temperature- and pressure-resistance.


CONCLUSION


The Liquiline Mobile CML18 multiparameter instrument is a suitable tool for anyone who wants to have values they can trust, in the laboratory or at the sampling point. It is robust like a field device and brings identical sensor technology and measurement algorithms from the process to the laboratory, eliminating all uncertainties and discrepancies in measured values caused by different measuring technologies. Thanks to its compact design and easy operation via the SmartBlue app, Liquiline Mobile CML18 can be applied wherever and whenever it is needed.


Endress+Hauser www.endress.com


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