BALL FLOWMETER OF ELECTROCONDUCTIVE LIQUID Russian patent published in 2024 - IPC G01F1/05 

FIELD: measuring.

SUBSTANCE: invention relates to measurement equipment and can be used in flow measurement of electroconductive liquid (water, aqueous solutions of organic and inorganic compounds) in chemical, food and pharmaceutical industry, in electric and heat power engineering, in housing and communal services and social sphere of economy, where it is required to measure extremely low liquid flow rates in a very large dynamic range with the required accuracy. Ball flowmeter of electroconductive liquid consists of housing, jet-guiding device, ball made of dielectric material with zero buoyancy in liquid, annular channel, two electrodes placed in annular channel, and electronic unit, wherein in the electronic unit between the two electrodes a blocking capacitor is connected, the inverting input of the operational amplifier is connected to the electrode through a low-pass RC filter, and the non-inverting input of the operational amplifier is connected through a resistor to an electrode connected to the collector of the bipolar transistor, the operating mode of which is set by a resistive divider of supply voltage.

EFFECT: achieving high electrical noise immunity and thermal stability at the required metrological characteristics regardless of the type of electroconductive liquid due to use of a two-electrode design of the flow meter, which is maximally adapted to use of additive manufacturing technologies, and exclusion of positive feedback in the electronic circuit.

1 cl, 3 dwg