Level Measurement & Control


Radar level sensors increase ­reliability on river sluices

October 2015 Level Measurement & Control

On the river Weaver in Cheshire, the Dutton sluice site consists of eight large sluice gates lifted by Rotork actuators. The water level in the river determines when to open or close the sluice gates and navigation is closed to river traffic if the water level is too high.

The site is a key measurement point and the level monitoring needs to be very accurate. Consequently the level of the river is now measured by four instruments. The first two are ultrasonic sensors (for redundancy) mounted in stilling tubes. These tubes are required in order to reduce loss of echo issues from weather and surface conditions. However the tubes can require substantial engineering to install, and generally they need continuous on-site maintenance to prevent blockages, or repairs to keep measurement errors to a minimum.

Even with this stilling tube installation, the scada maintenance engineer has commented, “In recent years we have experienced issues where either one or both of the ultrasonic sensors loses echo or drifts, causing level sensor failure alarms to be sent out.”

As a result, the Canal & River Trust (CRT) has installed two other devices alongside the ultrasonic sensors, as test instruments. Designed and manufactured by VEGA, the radar level sensors Vegapuls WL61 are unaffected by weather or surface conditions and were simply mounted on a unistrut adjacent to the stilling tubes. CRT has compared the data from both sets of instruments over several months and found that there was no drift with the WL61 water radars since installation.

“Whilst we have seen occasions where the water level on one or both of the ultrasonic units rises and the radars have not,” commented the engineer. “As far as I can see, the WL61 radars provide more reliable data than the ultrasonic devices. My concern with the ultrasonic sensors is that drift could create nuisance alarms and result in staff call outs.” There are also the ongoing maintenance requirements associated with the stilling tubes. “I do not have these concerns with the WL61s. In addition, I have confidence in the support from VEGA should an issue arise with any of the instruments at a later date.”

As the engineer summed up, “I am pleased with the quality and performance of the VEGA radar level sensors. We will be installing these in place of the ultrasonic sensors at the other River Weaver sites and in other CRT sites as we replace older equipment.”

For more information contact Chantal Groom, VEGA Instruments SA, +27 (0)11 795 3249, chantal.groom@vega.com, www.vega.com



Credit(s)



Share this article:
Share via emailShare via LinkedInPrint this page

Further reading:

Level switches master viscous substances
July 2021, VEGA Controls SA , Level Measurement & Control
VEGA has developed the new front-flush level switch, Vegapoint 24, especially for use with sticky, viscous or abrasive products.

Read more...
New horizontal float switch
June 2021, ASSTech Process Electronics + Instrumentation , Level Measurement & Control
The R40 LSH now includes devices for point level measurement with features such as floats and reed contacts.

Read more...
Bypass level indicators
June 2021, Instrotech , Level Measurement & Control
Instrotech now offers Kobold’s NBK level indicators for continuous measurement, display and monitoring of liquid levels in above or below-ground tanks.

Read more...
Fit for extreme applications
March 2021, Endress+Hauser South Africa , Level Measurement & Control
The first 2-wire loop-powered compact transmitter enters the market.

Read more...
The Internet of Things is changing logistics
March 2021 , Level Measurement & Control
A focus on application engineering allows Trafo Power Solutions to supply customised dry-type transformers for a range of sectors including renewable energy. “We begin at the proposal stage by engaging ...

Read more...
Radar is the better ultrasonic
February 2021, VEGA Controls SA , Level Measurement & Control
Radar signals are not significantly influenced by changing ambient conditions, which makes them highly reliable and extremely accurate.

Read more...
Top-quality drinking water through ozone treatment
January 2021, VEGA Controls SA , Pressure Measurement & Control
Vega’s pressure transducers make an important contribution to the continuous processing of top-quality drinking water.

Read more...
Reed level transmitter suitable for food applications
November 2020, WIKA Instruments , Level Measurement & Control
WIKA has expanded its range of level transmitters with reed measuring chain by adding the model FLR-F for food applications.

Read more...
Membrane level monitor
October 2020, Instrotech , Level Measurement & Control
Kobold’s NMF membrane level monitors are an excellent choice for cost-effective level monitoring of bulk goods in storage vessels.

Read more...
Measuring in the dust cloud
October 2020, VEGA Controls SA , Level Measurement & Control
Radar level measuring instrument with 80 GHz finds its way in extreme environments.

Read more...