FEATURE ANNIVERSARY SUPPLEMENT
THE MASS APPEAL OF CORIOLIS TECHNOLOGY
Krohne documents the developments and highlights of the Coriolis mass flowmeter market
T
he 1980s was the decade when many companies entered the Coriolis
market. Some survived, others were absorbed into bigger corporations and some brands disappeared altogether. With the introduction of the Coriolis mass flowmeter to almost all markets today this flow technology has gained in momentum, with growth rates recently above 10% per year.
The single straight tube design is arguably one of the most advanced designs and considered one of the milestones in Coriolis technology. Introduced commercially by KROHNE in the early 90s the straight tube design provides the lowest pressure drop whilst providing high accuracy. A great deal of research and development was required to make such an advanced construction possible and it has allowed the mass flowmeter to be introduced into difficult processes and environments that were never before seen as suitable for such meters.
KROHNE’s OPTIMASS was launched in
2002 incorporating this innovative development. It soon became clear to the end user that the advanced straight tube design presented significant benefits when measuring slurries, abrasive fluids, shear sensitive fluids and high viscosity
fluids, and the ability for the meter to be easily drained and cleaned was an additional attraction in hygienic applications. KROHNE’s OPTIMASS range of Coriolis
mass flowmeters provides a solution for almost any application in the most diverse of industries, such as chemical, food and beverage, oil and gas, pharmaceutical etc. The availability of these meters in several tube materials such as titanium, tantalum, hastelloy c, stainless steel, duplex and super duplex opened opportunities in additional applications such as those with highly corrosive fluids. A huge breakthrough in Coriolis mass
flowmetering was, however, still to come. Gas entrainments in liquid media had always presented a serious challenge for mass flowmeters because the relative movement between gas and fluid dampens the amplitude of the measuring tube. This dampening leads to inconsistent sensor amplitudes, which interfere with the electronics’ capability to determine the actual resonant frequency. Many mass flowmeters simply "freeze" their last stable reading to cover this loss of measurement. KROHNE accepted the challenge, and went on to develop and successfully implement a unique feature: Entrained Gas Management (EGM).
35th Anniversary
Krohne’s OPTIMASS range of Coriolis mass flowmeters provides a solution for almost any application in a range of industries
OPTIMASS Coriolis mass flowmeters
with EGM are able to follow and correct for the varying amplitudes. This ensures no loss of measurement with gas entrainment up to 100% of volume with the meter continuing to present an actual measured reading, together with an indication or configurable alarm for the user. This flow indication can be helpful to improve processes by identifying transient gas entrainments. Purely based on this technology, many users discovered that they had 2-phase flow, and were then able to start looking for possible causes. KROHNE remains at the forefront of
Coriolis mass flowmeter technology and continues to invest significantly in research and development to ensure that they can continue to not only meet, but exceed, the requirements of the market place and their customers.
Krohne
uk.krohne.com
35 YEARS: DOING TIME FOR LEVEL MEASUREMENT
In the last 35 years, the biggest development for the level transmitter market has been 'time-of-flight' based, non- contact technologies; first with ultrasonic sensors and, over the last twenty years, using microwave radar to measure level. Between them, these two technologies can handle just about any product you can think of, solid or liquid. Put simply, they use 'time taken there and back', to measure distance and compute volume. But there is a difference between them, the distance travelled in one second by each illustrates this; for ultrasound (331.6m/s) just over the height of the Eiffel Tower, yet for a microwave signal, almost to the moon! (330,000km/sec). So, particularly for radar, measuring this 'there and back time', by the mm is quite a science! Microwave radar sensors are today the fastest growing new level technology for both liquids and solids. The main reason is that they are unaffected by many things that can affect ultrasound, like pressure, temperature, vacuum, surface turbulence, air movement, dust and vapours. They can be divided into two techniques: 'non contact' (through air) or 'guided' via a rod or cable, and latest generation devices of either type are offering more or less equal performance with different application benefits to the user. Although both ultrasonic and radar techniques have been around for a number of
years, it's the advances in electronic components, materials and manufacturing that has really made the difference, especially to microwave radar based level transmitters. Like many modern goods; cost, set up time and component size have reduced - conversely, performance, ease of use and application areas have increased. This means, in particular, these two radar measurement techniques have become everyday solutions across countless industries and processes. VEGA Controls T: 01444 870055
www.vega.com/uk
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