Product category:
Conventional Industrial Liquid flowmeters
News Release from: Krohne | Subject: H250 variable area flowmeter
Edited by the Processingtalk Editorial
Team on 05 October 2005
Cost effective oil measurement flowmeter
solution
The Krohne H250 variable area flowmeters are providing a cost effective solution to processing rape seed oil at Thywissen Company, a specialist food manufacturer based in Germany
The Krohne H250 variable area flowmeters are providing a cost effective solution to processing rape seed oil at Thywissen Company, a specialist food manufacturer based in Germany Rape seed oil, which is used in the manufacture of many food products, presents a particularly difficult accurate flow measurement challenge
This article was originally published on Processingtalk on 28 Oct 2003 at 8.00am (UK)
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Its high viscosity and low conductivity mean that measurement technologies such as vortex meters and electromagnetic flowmeters are not suitable.
Thywissen also investigated using ultrasonic and Coriolis flow measurement instruments, which could be suitable for the application because their performance is independent of viscosity and conductivity.
However, the company decided that the Krohne H250 variable area flowmeter provided the best combination of value and measurement performance.
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Krohne has launched the IFC100, a signal converter for its Optiflux range of electromagnetic flowmeters that offers excellent performance at an entry level price
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During processing, the rape seed is first pressed to extract the oil.
The raw oil is then refined using phosphoric acid and caustic soda, which are used to remove phosphatides and free fatty acids.
The oil is then bleached with mineral earth that absorbs colourants.
The Krohne H250s are used in these processes to measure accurately the amount of mineral earth added to processing tanks during this operation, which is delivered in both batch and continuous phases.
For the continuous bleaching process the H250 is fitted with an electronic signal converter (ESK) which provides an analogue output.
The contact-free ESK uses two magnetic-field sensors to detect changes in the magnetic field-strength from the magnet built-in to the flowmeter float.
The 4 - 20 mA signal output from the instrument is used to control dosing of the mineral earth.
In batch operation, the H250 displays readings of the flow rate and total quantity of mineral earth that is being added to processing tanks, which can be displayed alternately if required.
Finally the oil is de-odorised, which takes place in a vacuum at a temperature of approximately 250C.
This process extracts the remaining colourants as well as odour-producing substances, flavourings and fatty acids from the oil.
It also removes any high-viscosity hydrocarbons or other environmentally harmful substances that might be present.
The Krohne H250 is an 'all-in-one' metal flowmeter that operates on the float principle and is suitable for a broad range of measurement applications where the flow rates of liquids or gases need to be measured accurately.
The instrument can be configured to display either linearised or non-linearised flow rates.
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