Monitoring system keeps tabs on landfill
A
Carlo Gavazzi product story
Edited by the Engineeringtalk editorial team
Feb 13, 2002
Biffa UK has installed a Carlo Gavazzi Dupline monitoring system at its Brookhurst Wood Landfill in Horsham, West Sussex.
Biffa UK has installed a Carlo Gavazzi Dupline monitoring system at its Brookhurst Wood Landfill in Horsham, West Sussex.
The system automatically monitors levels and flow of leachate, returned water and methane gas via flow meters, level sensors, control pumps and valves.
Furthermore, it can even monitor itself.
Brookhurst Wood is a former clay quarry, one of the deepest in England, and while it only has five years of filling left, the monitoring system will be required to operate for a further 20 years.
The Environment Protection Act, 1990, makes the monitoring of leachate and methane mandatory.
If landfill plants do not abide by the act, they do not receive a license.
The system specification requires Dupline to monitor seven remote flow meters, several level sensors and 12 pumps.
All information is displayed in graphical form on a PC at a central location.
It is monitored through third party software, SpecView, which incorporates a strategy controller module.
This enables 'intelligent' decisions to be taken based upon conditions defined by the user, such as time, multiple events and loss of input.
The whole scheme is broken down into multilevel screens with increasing amounts of detail, the first of which provides an overview of the whole plant.
At Brookhurst Wood, Dupline is linked to a PC using an OptoLink interface, which enables up to 64 Dupline systems to be connected to one PC via an RS232 serial port.
However, Dupline is also compatible with Modbus, ProfiBus and DeviceNet, making it simple to integrate the best features of Dupline into an existing system.
Dupline transmits signals bidirectionally over 10km (6 miles) on a single twisted pair cable.
Special cables are not necessary and cable layout is user definable.
Dupline is also being used at Brookhurst Wood to solve a variety of other problems.
For example, if a pump flow meter shows an output of 1200 litre/min and the tank delivery meter is registering only 1100 litre/min then there is obviously a problem.
By definition we can say that there is a 100 litre/min loss somewhere between that pump and the tank.
Thanks to Carlo Gavazzi's Dupline system, maintenance crews know exactly what to look for and where, thus saving time and money.
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