RU2793994C1 - Kit for installation of measuring sensors at a given depth of liquid that do not allow complete immersion - Google Patents

Abstract

FIELD: measurement kits.

SUBSTANCE: kit for measurements in liquid at a given depth contains a body with a perforation in the lower part, a cover, a movable float to which the sensors are attached, a branch pipe with a valve, and an oil seal. The upper part is hermetically sealed, an external device for pumping air inside is connected to it.

EFFECT: possibility of deep-sea measurements with sensors that do not allow complete immersion.

1 cl, 1 dwg

Description

Technical field

The invention relates to measuring instruments and is intended for measuring the physical values of the properties of liquids at a given depth.

When carrying out measurements in a liquid medium, situations often arise when it is necessary to contact the sensitive element with the medium in the liquid at a given depth, and the design of the sensor does not allow it to be completely immersed in the liquid. This is true, for example, for glass electrodes of a pH meter, where the working solution must flow from the electrode under the action of gravity during the measurement process.

State of the art

A device for measuring the water level in reservoirs is known (patent RU No. 2627569, G01F 23/68, G01F 23/28, G01F 23/292). The device contains a vertically located pipe, in the lower part of which there is a nozzle with an axial hole for supplying water into the pipe cavity. Inside the pipe there is a float freely floating in the water, which is made in the form of a hollow or solid disk, overlapping the pipe section along its inner contour with a gap. The float is made of lightweight water-repellent material, such as plastic. A measuring device is placed in the upper part of the pipe, which can be an optical or other distance meter, the probing beam of which is directed mainly to the central part of the disk floating in the water. The hole in the nozzle is placed coaxially with the main axis of the pipe and is mainly 10-20 mm in diameter. The pipe in the upper part contains a casing that protects the measuring device from meteorological precipitation and solar radiation, as well as an outlet that connects the cavity of the pipe with the external air of the reservoir.

Disadvantages: the device does not provide the possibility of using measuring devices that require contact of the sensitive element with the medium in the liquid column at a given depth, but whose design does not allow them to be completely immersed.

A device for measuring the vertical density profile of sea water is known (patent RU, 2631017, G01 N9/26). SUBSTANCE: seawater vertical density profile meter contains a vertical tube with an open lower hole and an accessible upper hole, a differential pressure sensor inside the tube and the atmosphere, a controlled air compressor, the first distributed thermal profiler located inside along the tube, the second distributed thermal profiler located outside along the tube, an electronics unit and processor. The electronics unit is used to digitize the signals from the outputs of the pressure sensor and thermal profilers and to provide power to the compressor. The processor is used for primary processing of measurements, density calculation and compressor control. A compressor and a pressure sensor are connected to the upper opening of the tube. The compressor control input, pressure sensor output, thermal profiler inputs and outputs are fed to the electronics unit, the output of which is fed to the processor.

Disadvantages: it is impossible to use measuring devices that require contact of the sensing element with the medium in the liquid column at a given depth, but whose design does not allow them to be completely immersed.

The essence of the invention

The objective of the invention is to expand the arsenal of devices for measuring the parameters of liquids at a given depth through the use of sensors that do not allow complete immersion.

To solve this problem, a kit for installing measuring sensors in liquid at a given depth is used, which contains a housing, a measuring sensor and a controlled device for pumping air under pressure into the housing.

In contrast to the known device, the housing in the upper part is closed with a sealed lid. In the upper part of the housing there is a branch pipe with a valve, which is connected to a controlled device for pumping air under pressure into the housing. Also in the upper part of the housing there is a device (gland, coupling) for hermetic connection of signal cables connected to the sensors. Inside the housing, in its lower part, a movable float is installed, the design of which provides for the possibility of attaching sensors to it, including those that do not allow complete immersion in the medium in which the float floats. The lower part of the body is perforated to bleed the air pumped through the valve, which prevents the float from being pushed out of the body and limits the lower limit of the liquid level.

The invention is illustrated by a drawing, which shows a kit for installing measuring sensors in a liquid medium at a given depth.

The kit contains a housing, which is a hollow cylinder (pipe) 1, hermetically sealed from the upper end with a lid 2, inside the lower part of the pipe there is a movable float 3, to which sensors 4 are attached, requiring contact with liquid, including those that do not allow complete immersion . In the lower part of the body 1 there is a perforation 5 to bleed excess air from the body and facilitate the circulation of the test liquid. To pump air under pressure, a branch pipe with valve 6 is installed in the upper part of the body, to which an external compressor is connected. Also in the upper part of the housing there is a gland (coupling) 7 for sealing signal wires for connecting sensors to an external measuring device.

The kit is used as follows.

Cylinder 1, together with float 3, is partially immersed in the test liquid. The sensors 4 fixed on the float 3 and connected to the external measuring unit through the stuffing box 7 thus come into contact with the investigated liquid. Cover 2 is hermetically sealed and the external compressor is turned on. The liquid is pushed down from the cylinder 1 by the pressure of the air pumped by the external compressor through the branch pipe with the valve 6. When the float 3 is lowered to the required level, the external compressor is turned off and the air supply is stopped. The valve in the nozzle 6 maintains the air pressure necessary to hold the float 3 in position. Perforation 5 in the lower part of the cylinder 1 serves as an additional protective valve through which, in case of too deep immersion of the float 3, excess air is bled from the cylinder 1, which does not allow the air to push the float 2 out of the body. Also, the perforation 5 facilitates the ingress of liquid to the sensors 4. When the float 3 rises above the required level, the external compressor is turned on and the compressed air supply is resumed through the branch pipe with valve 6. Thus, the required working level of the liquid in the cylinder is regulated, and the sensor comes into contact with the medium at the required depth. The position of the float 3 in the housing 1 is monitored either visually (for example, using a transparent cover and colored marks inside the housing), or indirectly by the presence/absence of air bubbles released on the surface of the liquid, bled through the perforation 5 (in this case, the position of the device is chosen so that the upper perforations were at the depth at which the sensors are to be installed), or in another convenient way.

Thus, the installation of sensors not intended for use at depth allows some measurements that were not possible before, for example, the measurement of hydrogen index (PH) at depth with precision sensors that cannot be completely immersed.

Claims (1)

A kit for installing measuring sensors in a liquid at a given depth, containing a body, a cover, a float and measuring sensors, characterized in that the upper part of the body is hermetically closed and an external device for pumping air into the body is connected to it via a branch pipe with a valve, and a movable float with measuring sensors is installed in the lower part of the housing, and the lower part of the housing has a perforation.

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