FLOW, LEVEL & CONTROL FEATURE Derek Moore, UK product level manager at Siemens UK &
Ireland, guides us through the latest level measurement technologies for diverse and challenging process operating environments
XT W MEASURING UP
ithin process industry operations, level measurement instrumentation
can have a significant impact on operational efficiency, safety and cost. Whether it’s monitoring water levels in open channels, tracking the amount of grain in a silo, or measuring oil levels in a tank, accurate level measurement will inform operators as to material quantities at any given location and assist with other related essential decision-making. In addition, the instrumentation
eliminates the need for constant human-based measurement from the top of vessels, providing a safety-first option when working in hazardous environments. Furthermore, with the need to manage raw materials and finished products to ensure processes are efficient and inventory ordering optimised, the benefit of knowing where materials are located can mean that valuable resources are utilised more effectively. While no single technology solution can address the needs of all industrial applications, the availability of a wide range of technology options – including Ultrasonics, Radar, Guided Wave Radar, Capacitance, Point Level and Hydrostatic – ensures that appropriate solutions can be matched to the application. Some of the key solutions include:
RADAR-BASED FOR SOLIDS, LIQUIDS AND SLURRIES Proven to perform reliably on a wide range of solids materials, the SITRANS LR560 solids radar transmitter copes with dusty operating environments and is unaffected by temperature changes. Its small process connection means it can be fitted onto most silo’s flanges. The instrument meets the challenges
of liquid measurement within storage and process vessels measuring up to 20m
deep; and offers a number of process connections including hygienic versions. Wetted parts include St/St and chemically resistance PTFE & PVDF encapsulated options. The low frequency functionality of the SITRANS LR200 also benefits scenarios where turbulence, build-up or foam are present.
GUIDED WAVE RADAR The reliable SITRANS LG solution can cope with aggressive vapours, high temperatures and pressure, dust, steam and material build-up. Pre-configured for the application, onsite installation is straightforward and the four-button programming and menu-driven quick start wizard ensures the device is operational without delay. Advanced echo processing provides for unrestricted measurement down the length of the probe, ensuring accuracy for all readings, even in small containers.
ULTRASONICS A new addition is the SITRANS LUT400 and Hydroranger 200 HMI series of ultrasonic controllers, which are designed to deliver high accuracy, ease-of-use, simple set-up and customer-driven features. As a non-contacting technology, the three series models require little or no maintenance and are suitable for short to long range applications for liquids, slurries and solids. This has patented Sonic Intelligence
echo processing capability, delivering an improved performance in noisy and harsh environments, and is ideal for water/wastewater monitoring and pumping, inventory management and truck load outs.
HYDROSTATIC For a low cost option for direct mounting
/ INSTRUMENTATION
or mounting with remote seals on tanks and vessels, hydrostatic level measurement through gauge, absolute and differential pressure transmitters can be a good solution. The SITRANS range can handle extreme chemical and mechanical loads, as well as electromagnetic interference, and is already widely specified within the chemical and petrochemical industries.
CAPACITANCE Such technology is tried and tested across a range of applications, with inverse frequency shift capacitance continuous level transmitters proving their worth with liquid, solid and interface applications. The SITRANS LC300 and LC500 use active-shield technology to derive true and accurate level recordings from the material surface. Some of the sectors making use of capacitance technology solutions include chemical, hydro-chemical processing, and the food and beverage industries.
REMOTE MONITORING With many process sites often difficult to reach or navigate, remote monitoring can be an important tool when it comes to checking on inventory levels, undertaking regulatory monitoring, reviewing remote maintenance alarming, or process and environmental monitoring. The SITRANS RD500 remote data
manager provides remote monitoring through data logging, web access and alarming; while the RD100, RD200 and RD300 remote displays enable operators to view instrumentation readings from a convenient location.
Siemens
www.siemens.com
A wide range of technology options – including Ultrasonics, Radar, Guided Wave Radar, Capacitance, Point Level and Hydrostatic – ensures that appropriate solutions can be matched to the application, explains Moore
INSTRUMENTATION | OCTOBER 2016 13
Left: The Hydroranger 200 HMI series of ultrasonic controllers, which are designed to deliver high accuracy, ease-of-use, simple set-up
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