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connected to the process via optical measurement probes and longer fibre-optic lines. A separate industrial PC assumes responsibility for the data analysis and system integration. The required climatization, including explosion protection, can be implemented either in a climate-controlled cabinet or a separate analysis enclosure. Commissioning and overall investment costs can nevertheless quickly add up to six figures. One step closer to the process involves
spectrometers in a significantly more robust mechanical version, which are equipped with an integrated explosion protection function. These instruments no longer have anything to do with modified laboratory equipment but are specially designed devices characterised by streamlined commissioning. Because they still require climatization, however, they are far removed from a compact field instrument solution. Another important milestone on the path to
the process is the integration of an industrial embedded computer with direct connectivity to the control system. This approach offers even more process compatibility through an extended operating temperature range. Users can install the solution close to the process. However, connectivity to the process medium still requires optical measurement probes and fibre-optic lines. These types of already highly integrated systems stand out thanks to much faster commissioning and simple operation.
New techNologies make it possible
Making the decisive step in the direction of compact field instruments calls for newer or different technologies for the spectrometer components. The elimination of fibre optics and the integration of the measurement probes in an inline spectrometer promises an even more streamlined solution. The use of cost-effective standard components from conventional field instruments such as field enclosures, embedded computers, displays or compact transmitters offers further savings potential. By exploiting every possibility, manufacturers can deploy process spectrometers as compact field instruments that are much simpler to use and, above all, can be operated at a lower cost. An ideal example is the
compact Rxn5 Raman process analyser for measuring gas. This mechanically robust instrument fulfils all explosion protection requirements and features solid state cooling and an embedded computer. The autonomous Rxn5 is not dependent on an external
The Memosens Wave CAS80E and Liquiline CM44 transmitter supply the relevant measurement values in real-time, thus ensuring seamless analysis of potable and surface water quality without delays.
infrastructure. Chemometric models are already pre-built for many applications or they can be created for a specific application if needed. With this compact, integrated solution, users can easily and cost-effectively carry out transfer custody measurements of liquid natural gas (LNG) flows, for example. While this analyser is on its way to becoming a field instrument, the spectrometer components still largely correspond to that of a conventional laboratory spectrometer with a fibre-optic connection to the process, which is the reason for its large and heavy design.
headiNg toward the fiNish liNe
Endress+Hauser has developed process spectrometers that take full advantage of the chances and opportunities that innovative technologies offer. These instruments simply amount to an enclosure, a process connection and an integrated measurement probe. External fibre-optic lines are superfluous. A microprocessor autonomously controls the sensors, analyses the data and outputs the process parameters, including the status. The extensive processing power puts intelligent data analysis within reach. The process spectrometer is connected to a standard transmitter that enables simple connectivity to a process control or cloud system and conversely permits remote access to the sensors and service data. The process spectrometer is evolving into an IIoT field instrument. The Memosens Wave CAS80E
The Rxn5 Raman process analyser is a turnkey solution for the quantitative measurement of chemical compositions.
Instrumentation Monthly August 2022
UV-VIS-based spectrometer offers reliable real-time measurement of relevant analysis parameters such
as chemical and biological oxygen demand (COD/BOD), turbidity, nitrate and spectral absorption coefficient (SAC) in a single instrument. The CAS80E is optimised for beverage and surface water, wastewater, industrial wastewater and utilities applications and can be quickly adapted to specific applications with pre-installed analysis models. The Memosens Wave CKI50 process
spectrometer detects colours by using spectroscopy in the visible range of the electromagnetic spectrum. It outputs the colour in a three-dimensional colour space model in the form of CIE L*a*b* values. That means colours, colour variations or the accuracy of the expected colour can be determined. The mathematical analysis models required to analyse the spectroscopic results are stored in the instrument. Both spectrometers are as compact and easy to install as a sensor. Thanks to Memosens technology, they can be connected to the new generation of the Liquiline CM44 transmitters via ‘plug & play’ and combined with all other Memosens sensors.
summary
No process analytics, no process optimisation. As the groundbreaking “Process Sensors” roadmap from NAMUR confirms, users have long yearned for wider deployment of process analytics. However, this assumes easy commissioning, simple operation and maintenance that requires little effort. Before process spectrometers can evolve to genuine field instruments, know-how from different areas is required, namely laboratory, automation and process control technologies. The biggest challenge lies in combining expertise from all of these disciplines. If this happens, then a spectrometer can be like any other field instrument. The first promising developments are already on the market.
Endress+Hauser
www.endress.com 25
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