SOLID ELECTROLYTE DETECTOR OF OXYGEN CONCENTRATION IN GAS MEDIA Russian patent published in 2015 - IPC G01N27/407 

FIELD: measurement equipment.

SUBSTANCE: invention relates to measurement equipment. A solid electrolyte detector of oxygen concentration in gas media comprises a ceramic sensitive element (3), tightly placed in a metal body (4), a comparison electrode (8), a potential collecting lead (5), a measurement electrode (2), applied onto the external part of the ceramic sensitive element (3). The measurement electrode (2) represents a double-layer current-conducting coating, the first layer comprises a mixture of a powder of noble metal and zirconium dioxide, the second one consists of a noble metal powder. The ceramic sensitive element (3) is made from solid electrolyte in the form of a cylindrical element and a part of a sphere coupled to each other. The upper external cylindrical surface of the ceramic sensitive element (3) is connected to an internal side surface of the body (4) by means of a connecting material (7). The ceramic sensitive element (3) is additionally equipped with a plug (6) from metal oxide with a hole that covers the cross section of the cavity of the ceramic sensitive element (3). The comparison electrode (8) is located in a cavity formed by the internal surface of the ceramic sensitive element (3) and the surface of the plug (6), occupies its part and contacts with the internal part of the sphere and at least with a part of the internal cylindrical surface of the ceramic sensitive element (3). The comparison electrode (8) comprises a lower and at least one subsequent layer, the free end of the potential-collecting lead (5) facing the part of the sphere is taken out into the volume of the comparison electrode (8) via a hole in the plug (6), at the same time there is electric contact between the potential-collecting lead (5) and the lower layer of the comparison electrode (8). The free end of the potential-collecting lead (5) facing towards the part of the sphere is taken out into the comparison electrode volume (8) via the hole in the plug (6). At the same time there is an electric contact between the potential-collecting lead (5) and the lower layer of the comparison electrode (8). At least a part of the sphere of the ceramic sensitive element (3) protrudes beyond the limits of the body (4). Materials of the body (4), the ceramic sensitive element (3) and the connecting material (7) have a close coefficient of temperature expansion. The free part of the body (4) is connected to a tight lead of useful signal (1) with the help of welding, the cavity formed by the ceramic sensitive element (3), the body (4) and the tight lead of useful signal (1), is tight in respect to the environment.

EFFECT: invention provides for the possibility to expand area of application and reduction of detector cost.

9 cl, 1 dwg