发明公开
EP0077305A1 An electro-hydrostatic device to measure the specific gravity of liquids
失效
Elektro-hydrostatische Einrichtung zur Messung des spezifischen Gewichts vonFlüssigkeiten。
- 专利标题： An electro-hydrostatic device to measure the specific gravity of liquids
- 专利标题（中）： Elektro-hydrostatische Einrichtung zur Messung des spezifischen Gewichts vonFlüssigkeiten。
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申请号： EP82830234.9申请日： 1982-09-16
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公开(公告)号： EP0077305A1公开(公告)日： 1983-04-20
- 发明人: Assenza, Donello
- 申请人： Assenza, Donello
- 申请人地址： Via Attilio Friggeri 19 I-00136 Rome IT
- 专利权人： Assenza, Donello
- 当前专利权人： Assenza, Donello
- 当前专利权人地址： Via Attilio Friggeri 19 I-00136 Rome IT
- 优先权： IT4932381 19810918
- 主分类号： G01N9/20
- IPC分类号： G01N9/20
摘要：
A float constituted by a hollow body of a dielectric material (5) having on the top a metallic conducting disk (16) made from a non ferromagnetic material and on the bottom a permanent magnet (6), is immerged in the liquid (2) in a chalix shaped container (7) where on the exterior of the hollow stem there is a winding (8) constituting an electromagnet driven by the current supplied by the differential amplifier (12).
The float (5, 6, 16) assumes in the liquid a fixed position in virtue of feed-back effect produced by eddy currents positionvoltage transducer (18, 15, 17). The current flowing in the electromagnet is proportional, at less than a constant due to the weight of the float (5, 6, 16) to the hydrostatic buoyancy that is to say, to the specific gravity of the liquid.
The fixed position of the float (5, 6, 16) makes the measure independent by the spatial non linearities of the magnetic field and, by non linearity of the positionvoltage transducer (18, 15, 17).
The centering action of electromagnet (8) on the magnet (6) avoids the friction with the walls around the float (5, 6, 16), that remain suspended in the liquid.
The float (5, 6, 16) assumes in the liquid a fixed position in virtue of feed-back effect produced by eddy currents positionvoltage transducer (18, 15, 17). The current flowing in the electromagnet is proportional, at less than a constant due to the weight of the float (5, 6, 16) to the hydrostatic buoyancy that is to say, to the specific gravity of the liquid.
The fixed position of the float (5, 6, 16) makes the measure independent by the spatial non linearities of the magnetic field and, by non linearity of the positionvoltage transducer (18, 15, 17).
The centering action of electromagnet (8) on the magnet (6) avoids the friction with the walls around the float (5, 6, 16), that remain suspended in the liquid.
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