SU1427247A1 - Flow-type non-contacting liquid media turbidity meter - Google Patents

Abstract

The invention relates to analytical instrumentation, in particular to turbid meters, designed to control surface wastewater and other turbid liquid media, and can be used in chemical, metallurgical, power generation, agriculture, and environmental protection. The purpose of the invention is to improve the measurement accuracy, expanding the measurement range towards low turbidity values by compensating for the zero signal and {eliminating the entry of gas bubbles into the measurement zone and reducing the volume of the monitored liquid, overall dimensions and mass. The measuring cuvette is made in the form of a hollow cylinder that transforms into a hollow cone, inside which with a gap not less than five truncated cones forming light traps are coaxially spaced, some of them tapering to the bottom of the measuring vessel, and some - the opposite side. In the upper part of the measuring cell there is free space for the gas to enter the drainage space. 1 il. W (L

Description

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The invention relates to analytical instrument engineering, in particular, to turbid filters, designed to control surface wastewater and other turbid liquid media, and can be used in the chemical, metallurgical and energy industry, in security systems. environment in agriculture.

The purpose of the invention is to improve the measurement accuracy.

The drawing shows a flow-through contactless turbine meter for liquid media, a slit.

The outer part of the cuvette, the body, is a body of rotation of which, cone 2, ends in a lower part with a drain outlet nozzle 3. A cone 5 is attached to the conical part of the part 4, having a small nozzle in the lower part. A drainage space 6 is formed between the housing 1 and the internal parts of the part 4 and the cone 5.

In the conical part of the part 4 is a con "- the limiting measuring space of the truncated cone 7, with the small base facing down, is centrally integrated. Between part 4 and cone 7, free space is formed. An inlet 8 for supplying a controlled fluid passes through the walls of the housing I and the part 4. The upper edge of the part 4 is located below the upper edge of the housing 1. The spaces inside the Cone 7 are connected by drainage tubes 9 These may be somewhat around the perimeter) with the drainage space 6. The tubes 9 are located below the upper edge of the piece 4, Inside the cone 7 there are one or more hollow truncated cones 10, with small bases facing the sources of light.

The hollow cones 10 are fastened to the cone 7, for example, by means of several flat ribs. The bases of all rotation bodies are made with holes. All surfaces are made, for example, of sheet material.

An optical unit 11 is installed on the body 1, containing a glow lamp 12 (light source), a lens 13 (forming a luminous flux), and an optical fiber 14 with photodetectors installed on it 15. Before the photoreceiver0

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A protective glass 16 is installed. The air gap between the protective glass and the surface of the monitored liquid provides a non-contact measuring method.

Mutnomer works as follows.

The controlled fluid enters the cell of the mutomer through the pipe 8 and fills the turbidity meter to the level j defined by the drainage tubes 9 located below the upper edge of the part 4. Excess fluid flows through the tubes 9 into the drainage space 6 and then out of the turbidity meter through pipe 3.

The gas bubbles entering through the turbidity meter with the controlled liquid flow freely rise between the parts of the part 4 and the cone 7 into the drainage space 6, from where they are removed together with the excess liquid through the nozzle 3.

All elements of the cuvette are located coaxially in order to ensure uniform (symmetric) absorption of scattered light throughout the volume and to prevent the light reflected from the cone 5 from directly falling on the photodetectors.

The light beam from the incandescent lamp 12 by the lens I3 is fixed through the diaphragm 14 at a point located at the small base of the cone 10, and then diverging with a beam, goes deep into the vessel. Part of the light scattered backward by particles suspended in the liquid falls on photodetectors, which convert the amount of scattered light into an electrical signal. The light that has passed through the liquid falls on the inner surface of the cone 5, and then, having experienced multiple absorption on the surfaces of the cones 5, 7 and 10 and the part 4, is quenched. The zeroing of the initial scattered radiation flux allows one to reduce the measurement error by a factor of 1.5 and to extend the measurement range towards small concentrations of suspended solids. In addition, the presence of gas separating elements in the non-working zone prevents the entry of gas bubbles into the measuring part of the cone 7, preventing distortion of the measurement results.

Claims (1)

 Invention Formula A continuous contactless meter for liquid media containing a light source arranged sequentially on the same axis as the light source, an optical system that forms a diaphragm with a photodetector external to the light source, and a measuring cell with an inlet and outlet nozzles, that, with a measurement accuracy chain, the measuring cuvette is complete as inside the body of a row of coaxial hollow truncated cones forming light traps having different taper, some cones tapering in the direction of the light beam, and some in the opposite direction; the first cone is installed along the radiation with a gap relative to the top edge and the outer walls of the body , at the inlet is located in the plane passing between the bases of the first cone along the radiation path, and the outlet cone is connected to the cone last in the course of the radiation. / 2 / J