SU669199A1 - Level meter - Google Patents

Description

I

This invention relates to an instrument used to measure the level of a liquid in the chemical, oil refining, food and other industries.

A level meter is known, which contains a displacer, mounted on a pole connected to the sensor element of the converter C,

This level gauge has low accuracy, since the output signal depends on the density of the feeds, the level of which varies.

Closest to the invention is a level gauge containing a float sensitive element, made in the form of an areometric balance with two buoys of odanak volumes displaced relative to each other’s height, and a measuring circuit 2.

The aim of the invention is to ensure measurement accuracy in a wide range of level variations.

This is achieved by the fact that the buoys are made identical.

The drawing is a schematic diagram describable gauge.

The level gauge contains two buoys 1 and 2 displaced one relative to the other in height, made identical, i.e., having the same diameters, height and weight and installed in the container 3 with the liquid. Buoys 1 and 2 are connected to force meters 4 and 5 connected to a dividing unit 6 connected to indicator 7, calibrated in units of level. It was established experimentally that for the necessary sensitivity of the division unit 6 to the change in level, the displacement of the buoys 1 and 2 in height (DL) relative to each other should be

DN -i N.

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The gauge works as follows. 5 When the level of the liquid in the tank 3 changes, the force meter 4 determines the buoyant force acting on the displacer 1, and the force meter 5 detects the buoyant force acting on the displacer 2

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 , px H, RLARH; - /)

gda And - ejecting force 1,

Claims (2)

acting on buoys; Si, Sj is the transverse area of the buoys; p is the density of the liquid; g- acceleration of the force of gravity; H, - the depth of the buoy Hj - depth 1 of the loading buoy Signal from force meters 4 and 5 enters the dividing unit 6 K. (2) (n / l) 3 /) From the expression (2) it can be seen that the indicator 7 is independent of changes in the density of the signal corresponding to the level of the liquid, since each level of any medium under investigation in this case corresponds to its own ratio of output values of force meters 4 and 5 in any range of variation of density of the medium followed. The invention includes a level meter containing a sensitive electrical amphometer made in the form of areometric scales with two buoys of equal volumes displaced relative to each other in height, and a measuring circuit characterized in that, in order to ensure measurement accuracy in a wide daaaeon of level changes, the buoys are made iantized . Sources of information taken into account in the examination of 1, Ageikiy DI and u). Sensors of control and regulation. M., Mashiostroenie, J965, p. 387. 2. USSR author's certificate N 216972, cl. G 05 D 9/12, 1967.