Flowmeters measure high-viscosity fluids
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Burkert Fluid Control Systems product story
Edited by the Engineeringtalk editorial team
Jan 30, 2009
Burkert has extended its 8070/8071 range of positive displacement flowmeters for the measurement of high viscosity fluids, such as glue, honey and oil.
The range now extends from 1/8in to 4in, providing metering with high levels of accuracy (0.5 per cent FS) for difficult-to-measure fluids with viscosities up to 1m centipoise.
Burkert has extended its 8070/8071 range of positive displacement flow meters for the measurement of high viscosity fluids.
The 8070/8071 flowmeters are unaffected by the problem of high viscosities encountered with paddle wheel flowmeters.
They are designed with a pair of meshed (geared) oval rotors that rotate under fluid pressure in an engineered measuring chamber.
This arrangement, with precision stainless steel or PPS gears and FKM seals as standard, is characterised by its levels of reliability, its ability to be used on horizontal, vertical and gravity applications, and its accuracy.
The efficacy of the design means that the meters are not affected by pulsating flow, they can be used with membrane pumps, and have a minimal pressure drop of up to 0.5 bar when correctly sized.
Precise sensing of flow on the 8070/71 flowmeters is accomplished via magnets in the geared rotors.
These actuate switches as they rotate and generate pulses; each pulse equates to a known volume of fluid.
The switches are Reed or hall-effect sensors, which can be mixed and matched to suit individual applications.
For operations in hazardous areas where this type of sensing is not allowed, Burkert offers mechanical versions of the flowmeters, which drive a gearbox to an associated display unit.
The accuracy of these units is better than +/- 1 per cent of reading.
The 8070/71 flowmeters are available with the choice of aluminium, PPS, or stainless bodies to cater for the widest range of applications.
They can be rated up to IP65, and are suitable for operation at temperatures up to 80C with standard PPS rotors, (min temperature -40C).
Optional higher temperature rotors can extend operation to 120C.
For applications where viscosities exceed 1,000cps, Burkert can provide high-viscosity rotors.
Each individual 8070/71 flowmeter is supplied with its own traceable metrology calibration report.
The units are supplied as standard with BSP connections (1/8in to 4in) with NPT (F) as an option.
Also available are remote mountable displays, transmitter and batch control modules, plus Atex-approved flow sensors.
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