Method and device for measuring density of a liquid
First Claim
1. A method of measuring the density of a liquid comprising the steps of:
- providing a sensor device that comprises a float unit with a first magnet and a strain-gauge unit with a second magnet;
immersing the float unit into the liquid the density of which is to be determined;
arranging the float unit and the strain-gauge unit at a distance that provides magnetic interaction between the first magnet and the second magnet; and
measuring the density variations in the liquid by registering deformations of the strain gauge caused by a force applied to the second magnet from the first magnet through the aforementioned magnetic interaction.
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Accused Products
Abstract
A sensor for measuring density of a liquid that comprises a float unit having a sealed hollow casing that contains a first magnet and a strain-gauge unit having a sealed hollow casing that contains a strain gauge and a second magnet arranged coaxially to the first magnet. Coaxiality of the magnets is provided by means of a guide rod installed on the casing of the strain-gauge unit and used to guide the float unit by inserting the guide rod into the central opening of the float unit casing. A characteristic feature of the sensor is that changes in the density of the liquid that cause displacement of the float cause detectable deformations of the strain gauge via forces of magnetic interaction between the first and second magnets without physical contact between the magnets. Since the elements of the sensor are located in sealed casings, they are not subject to damage and do not require maintenance.
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Citations
30 Claims
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1. A method of measuring the density of a liquid comprising the steps of:
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providing a sensor device that comprises a float unit with a first magnet and a strain-gauge unit with a second magnet; immersing the float unit into the liquid the density of which is to be determined; arranging the float unit and the strain-gauge unit at a distance that provides magnetic interaction between the first magnet and the second magnet; and measuring the density variations in the liquid by registering deformations of the strain gauge caused by a force applied to the second magnet from the first magnet through the aforementioned magnetic interaction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A sensor for measuring density of a liquid comprising:
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a float unit with a first magnet; a strain-gauge unit with a second magnet; the float unit and the strain-gauge unit being arranged at a distance that provides magnetic interaction between the first magnet and the second magnet, at least the float unit of said sensor being immersed into the liquid the density of which is to be determined. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification