Product category:
Flowmeters and Flow Sensors
News Release from: Arkon Flow Systems | Subject: ChannelMag
Edited by the Engineeringtalk Editorial
Team on 01 August 2003
Flowmeter solves flume problems at
Esholt STW
The ChannelMag flat electromagnetic area-velocity flowmeter ensures the correct treatment of sewage for the Bradford and outlying areas.
ChannelMag is a flat electromagnetic area-velocity flowmeter manufactured by Advanced Flow Technology (AFTCo) and marketed by Arkon Flow Systems It was installed in a 3m-wide inlet channel at the Esholt STW for Yorkshire Water in less than 4h from full to full again
This article was originally published on Engineeringtalk on 30 Nov 2000 at 8.00am (UK)
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The volumetric flowmeter Channelmag designed to measure flow in open channels and half-filled pipes has been specified by Saur UK Ltd for the new Glasgow West Sewage Treatment Plant.
Volumetric flowmeter chosen for sewage plant
Channelmag, the volumetric flowmeter designed to measure flow in open channels and half-filled pipes, has been specified by Saur UK for the new Glasgow West Sewage Treatment Plant.
It ensures the correct treatment of sewage for the Bradford and outlying areas.
ChannelMag was installed despite Esholt STW having an accurate flume in the inlet channel.
It however gave incorrect data when the effluent backed up due to a downstream blockage.
The level would rise (without flow), which would then be interpreted as an increasing flow rate - resulting in over-treatment, Tests after installation showed good correlation with the flume during normal flow conditions.
Unlike conventional electromagnetic meters, which operate using pulsed DC, ChannelMag operates with pulsed AC to energise the coils: this can be up to 5A at 33Hz.
The result is a high energy field, giving a superior signal to noise ratio.
The meter never needs cleaning, irrespective of the build up of grease, fat, algae or calcium carbonate deposits on the electrodes.
It also means that the strong magnetic field will reach every part of flowing media in the cross section of the channel, effectively turning the channel into a rectangular full bore meter.
The meter is calibrated in a large tow tank, as well as against a full bore mag meter traceable to NIST, the USA National Standard Laboratory at Alden Massachusetts.
Accuracy is 2% of reading at site conditions if installed according to specification and +/-4% for a "relaxed" accuracy.
Arkon is in the process of applying for MCERTS.
The meter is approved for use in Zone 2 areas and carries a 5-year warranty.
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