RU2551881C1 - Barometrically compensated electrochemical measuring gas analyser (versions) - Google Patents

Abstract

FIELD: measuring equipment.SUBSTANCE: invention relates to equipment for measurement of dissolved gas content in liquid and gas media, is intended, essentially, for usage in oceanographic apparatus and may be used in mining, chemical industry, in various technological and ecological systems for measurement and control of dissolved gas content in the medium under study. Essence: according to the first implementation version (Fig. 1) the barometrically compensated electrochemical measuring gas analyser contains a body (1), a sealed chamber (12) that has a capillary (13) and is filled with electrolyte, a cathode (16) and an anode (17) or an anode system which contact the electrolyte and are connected to a registering unit (18) represented by a transducer converting cathode current into an output signal. The cathode (16) is positioned at the capillary (13) output into the ambient environment. The cathode (16) and the capillary (13) are separated from the ambient environment by a round-shaped selectively permeable membrane (6). The membrane (6) is drawn to the gas analyser cathodic surface and is fixed thereon along a closed line by a lid (7) connected to the coupling nut (10). The gas analyser contains a barometric compensator (11) in the form of an elastic element separating the electrolyte in the chamber (12) from the ambient environment. The capillary (13) is designed in a pass element (3). One end of the pass element (3) with a sealing element (2) is installed in the body (1), rigidly or so that to enable movement. The other end of the pass element (3) with a sealing element (4) is passed through a sleeve (5) hole. The sleeve (5) is thread-mounted in the lid (7) which is installed with a sealing element (9) in the coupling nut (10). The coupling nut (10) is thread-mounted on the pass element (3). The membrane (6) edge part is clamped between the lid (7) shoulder and the sleeve (5) butt-end surface. The anode (17) or anode system is positioned in the capillary (13) or in the chamber (12). The chamber (12) is the space formed by the pass element (3) and the body (1). Such space is separated from the ambient environment by the barometric compensator (11) in the form of an elastic wall, for example, a rubber jacket fixed on the body (1) and in the pass element (3). The space formed by the pass element (3), the sleeve (5), the lid (7) and the coupling nut (10) is filled with an electroinsulating liquid (15), for example, oil. Such space, via the thread between the coupling nut (10) and the pass element (3), communicates with the space formed by the barometric compensator (11), the body (1) and the coupling nut (10), is filled with electroinsulating liquid (15) and separated from the ambient environment with an additional barometric compensator (14) in the from of an elastic wall, for example, a rubber jacket fixed on the body (1) and on the coupling nut (10). The second invention version (fig. 2) differs from the first one by the fact that the pass element (3) is installed in the body (1) with a sealing element (2) and so that to enable movement and is passed through the sleeve (5) hole with a sealing element (4). The sleeve (5) has radial holes. The sleeve (5) is installed on the body (1) with one end with a sealing element (6) so that to enable movement; with the other end, it is thread-mounted in the lid (8). The lid (8) is installed with a sealing element (10) in the coupling nut (11) that is thread-mounted on the body (1). The membrane (7) edge part is clamped between the lid (8) shoulder and the sleeve (5) butt-end surface. The anode (18) or the anode system is positioned in the capillary (14) or in the chamber (13). The chamber (13) is the space formed by the pass element (3), the sleeve (5) with its radial holes and the body (1). Such space is separated from the ambient environment by the barometric compensator (12) in the form of an elastic wall sealing the sleeve (5) radial holes for example, a rubber jacket fixed on the sleeve (5). The coupling nut (11) has radial holes positioned near the sleeve (5) radial holes. The space formed by the barometric compensator (12), the sleeve (5), the lid (8), the coupling nut (11) with its radial holes and the body (1) is filled with electroinsulating liquid (16), for example, oil. Such space is separated from the ambient environment by an additional barometric compensator (15) in the from of an elastic wall sealing the coupling nut (11) radial holes and the thread connection between the body (1) and the coupling nut (11), for example, in the from of a rubber jacket filled on the body (1) and the coupling nut (11).EFFECT: ensuring the main metrological characteristics of the device (sensitivity and long-term stability) as well as membrane material saving.

Description

The invention relates to techniques for measuring the content of dissolved gas in liquid and gaseous media, intended mainly for use in oceanographic equipment and can be used in mining, chemical industry, in various technological and environmental systems for measuring and monitoring the content of dissolved gas in the medium under study.

Polarographic transformers of dissolved oxygen are presented and fairly well systematized in chronology of their appearance, the last of which has been used so far in deep-sea hydrophysical studies at the Marine Hydrophysical Institute of the National Academy of Sciences of Ukraine. This technical solution is based on the invention [2]. This electrochemical gas analyzer contains a housing with a chamber filled with an electrolyte, an anode, or an anode system located in the chamber with an electrolyte, a cathode located at the end of the rack combined with the housing, and having contact with the gas analyzer electrolyte using an underwater channel located inside the rack. In this case, the cathode and the underwater channel are separated from the external environment by a selectively permeable membrane in the form of a circle, pressed against the rack by a two-layer cover using a union nut. The inner layer of the lid is formed by water-swellable plastic.

Similar essential features of this analogue [2] and the claimed technical solution are: anode and cathode; an electrolyte-filled chamber with a feed channel; a selectively permeable membrane, which is pressed against the cathode and the underwater channel by a cap (cap); union nut with which the cover is pressed; registrar.

The sensor works according to the principle of internal polarization, that is, the potential required for the restoration of oxygen molecules is given to the cathode using an anode inside the electrolytic chamber. Oxygen molecules from the test medium penetrate through a selectively permeable membrane and are reduced at the cathode to OH ^- ions, which, being carriers of electric current, move under the influence of potential difference between the anode and cathode through the capillary into the electrolytic chamber. Thus, an underwater channel with a small cross section, a certain length, and filled with charged particles, the amount of which depends on the oxygen molecules penetrating through the selectively permeable membrane, is, together with the cathode, a sensitive element, the resistance of which depends on the amount of dissolved oxygen in the test medium. This is possible only with a very small cross section of the supply channel, therefore, in some technical solutions it is made in the form of a layer or capillary, which, in principle, is the same [3].

In order to eliminate the influence of the resistance of the chamber with an electrolyte electrically connected in series with the capillary, modern electrochemical devices are constructed according to the “voltage fixation” method [4], according to which instead of one electrode polarizing the cathode (that is, one • anode), an electrode system is used - an electrode for current injection and a reference electrode for maintaining voltage in the solution near the working electrode. Such an electrode system is an anodic system as applied, for example, to a measuring channel of the concentration of dissolved oxygen of the polarographic type, for example, described in [3].

However, the above gas analyzer has a leak of the test medium under the membrane due to its lateral folds formed when putting on the cap. No matter how tight the membrane is drawn to the cathode, such a design will not provide reliable sealing of the capillary with electrolyte due to the lack of sealing means. For deep-sea studies, such a gas analyzer is unreliable, since the medium under investigation will penetrate to the cathode over time. In the study of the hydrochemical parameters of the sea, the characteristics of the gas analyzer will be distorted due to the mixing of liquids under the membrane: the external environment and the gas analyzer's own electrolyte. This reduces its sensitivity. And when studying the environment in the Black Sea, the cathode will quickly oxidize due to the presence of dissolved hydrogen sulfide in the deep water zone. When the third-party potentials surrounding the gas analyzer appear and change, the electric displacement incident on the anode will lead to a displacement of the characteristic, i.e. to the additive error of the gas analyzer.

The closest to the invention in terms of essential features is an electrochemical gas analyzer [1, p. 477]. This technical solution is selected as a prototype for each of the inventions included in the claimed group. The prototype contains a housing made of a compound, a chamber representing a space inside the housing filled with an electrolyte, a cathode glued into the housing rack, the non-glued surface of which has contact with the gas analyzer electrolyte using a capillary. An anode is located inside the chamber with the electrolyte, while the cathode and capillary are separated from the external environment by a circle-shaped selectively permeable membrane mounted on a column and fixed to the cathode surface of the gas analyzer in a closed line with a cap in the form of a cap with an axial hole in the bottom. The cover is pulled together with the membrane to the cathode and capillary with a union nut. The device comprises a bar compensator made in the form of a rubber cap separating the chamber with the electrolyte from the external environment. The cathode and anode are connected through a sealed connector to the recorder. The housing is mounted on a shank, through which the gas analyzer is installed in the device.

Similar essential features for the prototype and the claimed variants of the invention are: a housing, a sealed chamber that has a capillary and is filled with electrolyte, a cathode and anode, or an anode system in contact with the electrolyte and connected to the recorder in the form of a cathode current to output signal converter, while the cathode located at the exit of the capillary to the surface of the gas analyzer, the cathode and capillary are separated from the external environment by a selectively permeable membrane in the form of a circle, which is drawn to the cathode surface of the gas analyzer and fixed thereon by a closed line cover coupled with cap nut, barokompensator as an elastic member that separates the electrolyte in the cell from the external environment.

In the prototype, the membrane adjacent to the cathode and located between the inner surface of the lid and the rack of the housing has a sufficiently large diameter, encircling the side surface of the rack of the housing, which leads to the formation of folds of the membrane. In the basic technical solution [2] the folds of the membrane create a thickening on the side surface of the rack. The lid captures this thickening, as a result of which the membrane is tensioned on the end of the rack, where the cathode is glued. This ensures a tight pressing of the membrane to the cathode. The principle of operation of the prototype is the same as described above for the analogue [2]. The bar compensator, due to its elasticity, equalizes the pressure in the chamber with the pressure of the external environment, preventing the membrane from rupturing at great depths.

Despite the fact that the prototype showed high metrological characteristics, its temporary stability is low, as it requires re-grading and even refueling it during operation. The presence of folds under the lid in the design of the gas analyzer for gripping the membrane and its tension on the cathode when tightening the union nut cannot ensure the tightness of the chamber with the electrolyte. As a result, the electrolyte either pours out through the folds of the membrane, forming an air bubble in the chamber, or mixes with the test medium, changing the technical characteristics of the gas analyzer up to a change in the chemical structure of the cathode. The degradation process is slow, however, the possibility of automating the measurement process is excluded - a service specialist is needed, which is a disadvantage in the conditions of the expedition. The gas analyzer must be refilled, the failed membrane film must be replaced, and if the cathode is blackened, it must be cleaned. The presence of leaks under the membrane through its folds is well detected by checking the tightness of the gas analyzer by the electronic method, as is customary, for example, in medical practice in the manufacture of rubber products. Thus, the prototype has the disadvantage of other analogues - the presence of leaks under the membrane, which reduces its sensitivity and stability.

The basis of the invention is the task of creating an electrochemical gas analyzer, the combination of essential features of which achieves a new technical property - the exclusion of leaks under the membrane, which determines the overall technical result of the claimed variants of the invention - ensuring the basic metrological characteristics of the device - sensitivity and long-term stability. An additional technical result of the claimed device variants is the saving of membrane material.

The problem is solved in that according to the first embodiment of the invention, in a barocompensated electrochemical measuring gas analyzer containing a housing, a sealed chamber that has a capillary and is filled with electrolyte, a cathode and anode, or an anode system in contact with the electrolyte and connected to the recorder in the form of a cathode current to an output signal, while the cathode is located at the exit of the capillary to the surface of the gas analyzer, the cathode and capillary are separated from the external environment by a selectively permeable membrane An annular shape, which is drawn to the cathode surface of the gas analyzer and fixed on it in a closed line by a cover connected to a union nut, the bar compensator in the form of an elastic element separating the electrolyte in the chamber from the external environment, new is that the capillary is made in the passage element, one end of which with a seal is rigidly or movably mounted in the housing, and the other end with a seal is passed through the hole of the sleeve, which is threadedly installed in the cover installed with the seal in the union nut, which is threadedly mounted on the passage element, the edge of the membrane is sandwiched between the shoulder of the cover and the end surface of the sleeve, the anode or anode system is located in the capillary or in the chamber, the chamber is the space formed by the passage element and the housing and separated from the external environment barocompensator in the form of an elastic wall, for example a rubber stocking, mounted on the housing and the passage element, the space formed by the passage element, sleeve, cover and cap nut is filled an electrically insulating liquid, for example, oil, and a union nut - the passage element is connected with the space, which is formed by a bar compensator, a housing and a union nut, is also filled with an electrically insulating liquid and separated from the external environment by an additional bar compensator in the form of an elastic wall, for example, a rubber stocking fixed to housing and union nut.

The second embodiment of the invention differs from the first in that the capillary is made in a passage element, which is sealed and movably mounted in the housing and sealed through a bore of the sleeve, which has radial openings, with one seal mounted to move in the housing, and the other end is threaded in a cover installed with a seal in a union nut, which is threaded on a body, the edge of the membrane is sandwiched between the shoulder of the cover and the end surface The sleeve, the anode or anode system are located in the capillary or in the chamber, the chamber is the space formed by the passage element, the sleeve with its radial holes and the housing, the camera is separated from the external environment by a bar compensator in the form of an elastic wall that seals the radial holes of the sleeve, for example, in the form rubber stocking mounted on the sleeve, the union nut has radial holes located near the radial holes of the sleeve, the space formed by the pressure compensator, sleeve, cover, cap g the nut with its radial openings and the casing is filled with an electrically insulating liquid, such as oil, and separated from the external environment by an additional pressure compensator in the form of an elastic wall that seals the radial openings of the union nut and the threaded connection of the housing - the union nut, for example, in the form of a rubber stocking mounted on the housing and union nut.

The differences of the claimed device relate to the features of the capture of the edge of the membrane and the features of sealing other elements of the device, which eliminates leaks through the membrane and other seals. The capture and setting of the membrane is carried out by pressing its edge part to the flat surface of the cover, its ledge (shoulder), using the end surface of the cylinder sleeve. The membrane, unlike the prototype, is fixed and sealed in a free, straightened state. Thus, the formation of folds of the membrane during its formulation is excluded. With sufficient elasticity, the membrane itself is a sealing element, "choosing" the roughness of the cylinder end and the shoulder of the cap. If necessary, to ensure reliable sealing of the membrane between the end of the sleeve and the shoulder of the cover can be installed o-rings.

To improve the sealing of the device, additional measures were taken to exclude electrical leaks through its connections (membrane seal and other seals): firstly, a cavity is formed by the elements of the device, which is filled with electrical insulating oil, which enhances the sealing of the joints; secondly, an additional bar compensator is introduced.

The introduction of the sleeve, which seals the membrane and at the same time interacts with the cap on the thread, made it possible to exclude abnormal grip of the membrane, made it possible to reliably hold it during pulling on the sensitive element and prevent wrinkles.

Features of the cover and the sensitive element (in the form of a passage element), as well as the features of the connection of these parts allow normalizing the membrane tension by selecting the height of the shoulder of the cover relative to its bottom, which improves the manufacturability of the gas analyzer. The installation of a second baro-compensator and the presence of an insulating liquid (oil) between the baro-compensators made it possible to maintain the electrolyte quality between the membrane and the cathode for a long time and to cut off electrical leaks.

The invention is illustrated using the drawings, which depict: FIG. 1 - the first version of the device; FIG. 2 - the second option.

The work of the claimed electrochemical gas analyzer is based on the well-known principle of the polarographic type converters, including the prototype. The operation of the device is explained with the reduction of its assembly technology.

In the first embodiment (Fig. 1), the gas analyzer comprises a housing 1, in which a cylindrical passage element 3 is installed through passage rigidly (for example, on the compound) or movably (for example, as shown in Fig. 1 - using the sealing ring 2) the element with sealing, through the sealing ring 4, is passed into the hole of the sleeve 5 (hollow cylinder). The selectively permeable membrane 6 has the shape of a circle, the edge of which lies on the end surface of the sleeve 5. The membrane 6 is drawn to the working surface of the passage element 3 and is fixed on this surface in a circle due to the fact that the sleeve 5 is threadedly inserted into the cavity of the cylindrical cover 7 , which is made with a shoulder 8 (ledge) into which the end face of the sleeve 5 is pressed. The cover 7 with sealing, by means of the sealing ring 9, is inserted into the cavity of the union nut 10, which is screwed to the passage 3.

The device comprises a first pressure compensator 11 in the form of an elastic wall that separates and seals the electrolytic chamber 12 from the external environment — a space that is formed by the housing 1 and the passage 3 and filled with electrolyte. The bar compensator 11 can be made, for example, in the form of a rubber stocking, mounted on the housing 1 and the passage element 3. The passage element 3 is made with a channel - capillary 14. The device contains a second bar compensator 15 in the form of an elastic wall that separates and seals the space from the external environment, which form the first pressure compensator 12, sleeve 5, cover 8, union nut 11 and housing 1. The second pressure compensation 15 can also be made in the form of a rubber stocking - it is fixed to the housing 1 and the union nut 11, blocking and sealing The radial holes of the nut 11 and the threaded connection of the housing 1 - the union nut 11. The space created by the first pressure compensator 12, the sleeve 5, the cover 8, the union nut 11 (including the space of its through holes) and the housing 1 is filled with an electrically insulating liquid 16, for example, oil , and through the threaded connection "housing 1 - union nut 11" communicates with the space, which is additionally formed by the housing 1 and the union nut 11. This space is also filled with an electrically insulating fluid 16 and is limited from the environment by the second bar compensator 15.

The cathode 17 is installed in the passage element 3 at the outlet of the capillary 14 in the external environment. The device may comprise a single anode 18 or anode system. The anode or anodes can be located in the capillary 14, or a grounded housing 1 can be used as an anode, as, for example, in [6].

The anode 18 (or anode system) and the cathode 17 are connected to the registrar 19 in the form of a cathode current to output signal converter.

Compared with the first (Fig. 1), the second embodiment of the invention (Fig. 2) is more technologically advanced: during assembly it does not require a means to twist the sleeve 5 - for example, the grooves for twisting during assembly of the device can be chipped, leaving dangerous sawdust on the membrane.

Assemble the device as follows. The passage element 3 is installed in the housing 1 so that a space is formed between them. Overlap this space with the first pressure compensator 11 and fill the chamber 12 with the capillary 13 with electrolyte. On the shoulders 8 inside the cover 7 put the membrane 6 and its edge part is captured using the end surface of the sleeve 5, rotating the sleeve along the thread and clamping the membrane. Place the assembled structural elements in a technological container with electrolyte and put on the cover 7 with the membrane 6 stretched over the surface of the passage element 3 until contact with the seal 4 installed between the sleeve 5 and the passage element 3. Excess electrolyte will automatically pour out. A cap nut 10 is put on the cover 7, the inner surface of which is sealed with the outer surface of the cover 7 by means of a seal 9, and the cover 7 with the membrane 6 is pulled to the cathode 16, turning the nut 10 on the thread of the passage element 3. During this operation, the membrane is normalized to stretch. 6 by the cathode 16 until the membrane is fixed in a circle on the cathode surface of the gas analyzer by the edge of the lid 7, which is formed by an axial hole in its bottom. After that, the gas analyzer is dried.

Then install the second pressure compensator 14, for which the device is immersed in oil. The bar compensator 14 can be made in the form of an elastic stocking, bandaged on the nut 10 and the housing 1, or, as in [5], in the form of a hollow cylinder with oil, in which the gas analyzer itself is mounted through the seal of the movable contact with axial movement in the cylinder cavity.

The conclusions from the cathode 16 and the anode 17 through the insulating body of the passage element 3 and the housing 1 are connected to the input of the recorder 18.

The most wearing parts in the prototype are the stand (subjected to repeated deformation when replacing and fixing the membrane on it - the edge of the lid leaves traces over time on the cathode surface, which must be processed together with the cathode) and the anode degrading due to the electrochemical process occurring on it [3 ]. Therefore, for the purpose of manufacturability and operation in the proposed gas analyzer, the rack is replaced by a passage element 3, which does not have a thickening with a thread and is installed in the gas analyzer body through a radial seal, which allows not only to make it removable and easily replaceable, but also to reduce dimensions. In this case, the injector of the current polarizing the cathode is the gas analyzer body itself, made of conductive material, for example, as in the device [6].

The circuit of the recorder 18 using a three-electrode system can be, for example, as in the device [6]. A similar solution exists in [6], but differs from it in that the capillary supplying the electrolyte to the cathode is located inside the passage element. This technical solution allows you to save one of the advantages of the prototype compared to [6] - the constructive constancy of the sensitive zone, which is described in [3].

In the second embodiment (Fig. 2), the gas analyzer comprises a housing 1, in which a cylindrical passage element 3 is installed movably with sealing (for example, as shown in Fig. 2 using an o-ring 2). The passage element 3 is sealed with an o-ring 4, passed into the hole of the sleeve 5 (hollow cylinder). The sleeve 5 is made with radial through holes. It is movable and sealed (for example, as shown in Fig. 2 — using an o-ring 6) mounted on the housing 1. The selectively permeable membrane 7 has the shape of a circle, the edge of which lies on the end surface of the sleeve 5. The membrane 7 is pulled to the working the surface of the passage element 3 and is fixed on this surface in a circle due to the fact that the sleeve 5 is threaded inserted into the cavity of the cylindrical cover 8, which is made with a shoulder 9 (ledge), into which the end face of the sleeve 5 is pressed. Cover 8 with sealing, through The twist of the sealing ring 10 is inserted into the cavity of the union nut 11, which is threadedly fixed to the passage element 3. The union nut 11 is made with through radial holes.

The device comprises a first pressure compensator 12 in the form of an elastic wall that separates and seals the electrolytic chamber 13 from the external environment — the space that is formed by the housing 1, the passage 3 and the sleeve 5 (including the space of its through holes) and filled with electrolyte. The bar compensator 12 overlaps the chamber 13 from the external environment and can be made, for example, in the form of a rubber stocking, mounted on the sleeve 5 at the location of its holes. The passage element 3 is made with a channel - capillary 14. The device contains a second pressure compensator 15 in the form of an elastic wall separating and sealing from the external environment the space that forms the first pressure compensator 12, sleeve 5, cover 8, union nut 11 and housing 1. Second pressure compensator 15 can also be made in the form of a rubber stocking - it is fixed on the housing 1 and the union nut 11, blocking and sealing the radial holes of the nut 11 and the threaded connection the housing 1 - the union nut 11. The space formed by the first baroque with a compensator 12, a sleeve 5, a cover 8, a union nut 11 (including the space of its through holes) and a housing 1, is filled with an electrically insulating liquid 16, for example, oil, and through a threaded connection, the housing 1 - the union nut 11 communicates with the space that is additionally formed by the housing 1 and a union nut 11. This space is also filled with an electrically insulating liquid 16 and is closed from the external environment by a second pressure compensator 15.

The cathode 17 is installed in the passage element 3 at the outlet of the capillary 14 in the external environment. The device may comprise a single anode 18 or anode system. The anode or anodes can be located in the capillary 14, or a grounded housing 1 can be used as an anode, as, for example, in [6].

The anode 18 (or anode system) and the cathode 17 are connected to the registrar 19 in the form of a cathode current to output signal converter.

Compared with the first (Fig. 1), the second embodiment of the invention (Fig. 2) is more technologically advanced: during assembly, no means are required to twist the sleeve 5 - for example, the grooves for a screwdriver during assembly of the device can be chipped, leaving unsafe filings on the membrane.

The operation of the device according to the first and second variants of the invention, as an electrochemical system, is illustrated by the example of oxygen analysis. When a voltage is applied to the electrodes and 17 oxygen molecules 02 hit the cathode, they are restored (electrons are attached) according to the following electrochemical formula [3]:

those. ions of the hydroxyl group OH ^{- are formed} . The electrochemical reaction that occurs at the anode when the electrode chamber is filled with KCI solution has the form

на входе регистратора 19, согласно известному полярографическому принципу определения растворенного кислорода, пропорционален количеству молекул кислорода, продиффундировавших через мембрану к катоду, и определяется следующим соотношением:Current $$I_{\partial }$$

at the input of the recorder 19, according to the well-known polarographic principle for the determination of dissolved oxygen, is proportional to the number of oxygen molecules diffused through the membrane to the cathode, and is determined by the following ratio:

where n is the number of electrons (equal to 4) taking part in the reaction;

F is the Faraday number (equal to 96500);

P _m - oxygen permeability coefficient of the membrane indicated in the certificate;

S is the cathode area known in the design of the transducer;

cO ₂ is the concentration of dissolved oxygen;

m is the thickness of the membrane indicated in the certificate.

в обозначении тока $$I_{\partial }$$

говорит о том, что потенциал между анодом и катодом выбран таким, чтобы обеспечивался граничный диффузионный ток.Index $$\partial$$

in current designation $$I_{\partial }$$

indicates that the potential between the anode and cathode is selected so that a boundary diffusion current is provided.

Barocompensation of the device according to the first and second variants of the invention during its operation is carried out in this way. The first (main) and additional bar compensators are deformed under pressure when the device is buried and transfer pressure through the insulating liquid located between them to the electrolyte in the chamber 13. As a result, the pressure on the membrane 6 is balanced both from the side of the medium under study and from the side of the electrolyte chamber 12. An insulating liquid between the first and second baro-compensators cuts off the outflow of non-informative current under the membrane 6, which increases the accuracy of the conversion of dissolved gas into an informative signal, and, in addition, eliminates the poisoning of the cathode in the hydrogen sulfide zone. This new property is especially evident when working in the Black Sea, where there is a hydrogen sulfide zone of great scientific interest.

Claims (2)

1. Barocompensated electrochemical measuring gas analyzer containing a housing (1), a sealed chamber (12), which has a capillary (13) and is filled with electrolyte, a cathode (16) and an anode (17), or an anode system in contact with the electrolyte and connected to the recorder (18) in the form of a converter of the cathode current into an output signal, while the cathode (16) is located at the output of the capillary (13) into the external medium, the cathode (16) and the capillary (13) are separated from the external medium by a selectively permeable membrane (6) in the shape of a circle that is drawn to the cathode surface the gas analyzer and is fixed on it in a closed line by a cover (7) connected to a union nut (10), a bar compensator (11) in the form of an elastic element separating the electrolyte in the chamber (12) from the external environment, characterized in that the capillary (13) is made in the passage element (3), one end of which with the seal (2) is rigidly or movably mounted in the housing (1), and the other end with the seal (4) is passed through the hole of the sleeve (5), which is threadedly installed in the cover (7) installed with the seal (9) in the union nut (10), which the flange is mounted on the passage element (3), the edge part of the membrane (6) is sandwiched between the shoulder of the cover (7) and the end surface of the sleeve (5), the anode (17) or the anode system are located in the capillary (13) or in the chamber (12), the chamber (12) is the space formed by the passage element (3) and the housing (1) and separated from the external environment by the bar compensator (11) in the form of an elastic wall mounted on the housing (1) and the passage element (3), the space formed by the passage element (3), sleeve (5), cover (7) and union nut (10), filled with electrical insulating with a bolt (15) and a threaded union nut (10) - the passage element (3) communicates with the space that is formed by the bar compensator (11), the housing (1) and the union nut (10), filled with an electrically insulating liquid (15) and separated from the external medium additional barocompensator (14) in the form of an elastic wall mounted on the housing (1) and the union nut (10). 2. Barocompensated electrochemical measuring gas analyzer containing a housing (1), a sealed chamber (13), which has a capillary (14) and is filled with electrolyte, a cathode (17) and an anode (18), or an anode system in contact with the electrolyte and connected to the recorder (19) in the form of a converter of the cathode current to the output signal, while the cathode (17) is located at the output of the capillary (14) into the external medium, the cathode (17) and the capillary (14) are separated from the external medium by a selectively permeable membrane (7) in the shape of a circle that is drawn to the cathode surface the gas analyzer and is fixed on it in a closed line by a cover (8) connected to a union nut (11), a bar compensator (12) in the form of an elastic element separating the electrolyte in the chamber (13) from the external environment, characterized in that the capillary (14) is made in the passage element (3), which with seal (2) and with the possibility of movement is installed in the housing (1) and with seal (4) is passed through the hole of the sleeve (5), which has radial holes, one end with a seal (6) is installed with the ability to move on the housing (1), and the other end to cut it is installed in a cover (8) installed with a seal (10) in a union nut (11), which is threadedly mounted on the housing (1), the edge of the membrane (7) is sandwiched between the shoulder of the cover (8) and the end surface of the sleeve (5) ), the anode (18) or the anode system are located in the capillary (14) or in the chamber (13), the chamber (13) is the space formed by the passage element (3), the sleeve (5) with its radial holes and the body (1), the chamber (13) is separated from the external environment by a bar compensator (12) in the form of an elastic wall that seals the radial holes of the sleeve (5), mounted on the sleeve (5), the union nut (11) has radial holes located near the radial holes of the sleeve (5), the space formed by the bar compensator (12), the sleeve (5), the cover (8), the union nut (11) with its with radial holes and a housing (1), filled with an electrically insulating liquid (16) and separated from the external environment by an additional bar compensator (15) in the form of an elastic wall that seals the radial holes of the union nut (11) and the threaded connection of the housing (1) - union nut (11) , and fixed on the housing (1) and the cap ke (11).

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