PLANT MANAGEMENT
DUAL-ROTOR FLOW TURBINE METERS OFFER SUPERIOR ACCURACY T
urbine fl ow meters have been a recognised and reliable form of measurement technology for many
years.The volumetric fl ow rate is calculated using the rotational velocity of the turbines rotor. When the fl ow of liquid or gas increases, the rotor inside spins faster, which is directly linked to the volumetric fl ow. Dual-rotor confi guration meters are being used more regularly in industry now than in past years. This is due to their higher accuracy, large turndown ratios and improved repeatability. Research has shown that a dual rotor is far superior to a traditional single rotor in all these performance categories. Badger Meter’s Cox Exact Series, available
from Bell Flow Systems, uses dual-rotor technology and is extremely versatile. This series of fl ow turbines can be employed in numerous applications across various industries. Application examples include automotive and industrial applications such as engine test cells, precision blending processes, and F1 set- up and testing.
The turndown ratio of the Cox Exact Series is far greater than the typical 10:1 and can be as high as 500:1. This allows lower fl ows to be measured more precisely at greater than 0.15% accuracy of reading with repeatability down to ±0.02% on request, which
can benefi t a business economically by having one
highly effi cient dual-rotor meter rather than several single rotor meters. This range is constructed from 316 stainless steel and is suitable for harsh environments and high pressures up to 210 Bar. Another benefi t is that neither straight
sections of pipe or fl ow straighteners are required during installation, allowing the meters to be located almost anywhere in a piped system. The Cox Exact Series incorporates a helical rotor design that allows for a reduced pressure drop and less bearing wear. The force of the fl ow is evenly distributed across the rotors and bearings, which not only reduces the bearing wear but also improves repeatability and ensures longevity of the meter in service. ●
For more information visit
www.bellfl
owsystems.co.uk
TOUGH ENCLOSURES SIMPLIFY REMOTE I/O INSTALLATIONS I
ntertec has launched a range of tough fi eld enclosures for housing remote I/O and other control and instrumentation
electronics, featuring compact passive cooling to dramatically reduce costs of ownership. The new enclosures help process plant engineers to eliminate the need for large and costly plant buildings such as satellite instrument houses or remote instrument enclosures – which often need to be air conditioned and blast- and fi re-resistant. Fabricated from GRP (glassfi bre
reinforced polyester) materials, the enclosures provide rugged dust- and water-proof environments to protect remote control equipment located deep inside processing areas. The enclosure concept simplifi es the roll-out of more versatile distributed control architectures containing fi eld equipment. The advance can allow fi eld control equipment enclosures to be assembled and sealed in the factory – an effi cient and cost effective process –
avoiding the need for opening and exposure to dangerous local conditions at the site during installation and operation. The ability of the enclosures
to be fabricated with embedded insulation (a monolithic sandwich with layers of GRP sheet enclosing insulation) is a major virtue. Insulation is commonly required because modern remote I/O applications use sensitive electronic devices, with lifetimes and reliabilities that are drastically reduced by overheating. Effi cient insulation helps protect against
temperature extremes. This is one reason why the simple steel cabinets widely used for cabling-related fi eld junction boxes are not adequate for some of the more sophisticated remote I/O applications now being deployed. Because of the electronic devices
used, some form of cooling may also be required. If power is available at site, this
can be in the form of conventional fan cooling. However, the temperature stability of highly insulated GRP boxes makes it possible to effi ciently exploit passive cooling techniques which require no electricity and have no moving parts – also making them suitable for deployment in hazardous areas. ●
For more information visit
www.intertec.info
www.engineerlive.com 39
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