Flow transmitter doesn't suffer from trapped gas
An
Invensys Foxboro product story
Edited by the Engineeringtalk editorial team
Feb 25, 2005
A novel digital Coriolis flow transmitter can accurately measure flows containing entrained gas, without stalls, or stoppage even when starting or finishing batches with an empty tube.
Any material that contains both liquid and gas poses serious measurement problems.
And chocolate is one of the worst offenders.
Its entrained air spawns a host of production problems, including process interruptions and downtime, wasted material, costly reworks, poor product quality and expensive workarounds.
This is especially a problem with batch processing when starting or finishing with an empty tube.
Many leading confectionary processors have at last found a reliable answer to this problematic liquid/gas flow.
The innovative Invensys Foxboro CFT50 digital Coriolis flow transmitter uses breakthrough technology to accurately measure flows containing entrained gas, without stalls, or stoppage even when starting or finishing batches with an empty tube.
This CFT50's patented software-based system uniquely prevents the erratic flowtube vibrations that cause measurement failures with problem liquid/gas flows.
The transmitter maintains a digitally precise flow measurement, while simultaneously retuning the drive of the Coriolis flowtube every half-cycle of the drive frequency.
Developed by Invensys in a collaborative effort with Oxford University, this innovative approach to digital Coriolis flow metering is based on several key advances.
The flowtube drive signal is digitally synthesised, providing excellent meter control in challenging conditions.
And dynamic response is swift.
Independent trials show the meter can respond to a step change in flow within 25ms (compared with traditional response times measured in the tens of seconds), as its sophisticated algorithms correct for the effects of entrained gas.
Users confirm that the CFT50 transmitter shows a "remarkable ability" to meter viscous materials accurately during the difficult startup and end phases of their batch processes.
It provides batch flow measurement estimated as accurate to within 0.5% - other meters do well to get within 10%.
As a result, the plant can dispense with premeasurement line packing, air elimination systems, and other costly, time-consuming workarounds.
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