BAROMETRICALLY COMPENSATED ELECTROCHEMICAL MEASURING GAS ANALYSER (VERSIONS) Russian patent published in 2015 - IPC G01N27/28 G01N27/48 

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.