Chemical apparatus and process disinfecting – deodorizing – preser – Analyzer – structured indicator – or manipulative laboratory... – Means for analyzing gas sample
Patent
1986-02-21
1988-07-12
Lacey, David L.
Chemical apparatus and process disinfecting, deodorizing, preser
Analyzer, structured indicator, or manipulative laboratory...
Means for analyzing gas sample
204428, 338277, G01N 2756
Patent
active
047568852
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is based on a measuring sensor for determining the oxygen content in gases. A measuring sensor is already known (DE-PS 23 38 536) which is provided with a protective pipe which encompasses, a segment of a measuring element (solid electrolyte pipe) essentially consisting of a ceramic material extending from a pipe-like metal housing. This protective pipe is provided with a plurality of openings at its side wall for the input of the measuring gases and a small opening in diameter, for the output of the measuring gases. The openings in the side wall of the protective pipe are so formed so that they essentially guide the measuring gases tangentially with respect to the inside face of the protective guide, and so that the measuring element is substantially protected against bombardment by the solid particles which are contained in the measuring gas.
SUMMARY OF THE INVENTION
The measuring sensor of the invention is advantageous in that due to a different guiding of the measuring gas to the measuring element and due to a specific design of the protective pipe, the contamination or poisoning (oil ashes, reaction product of the lead, metallic dust of motor valves and the like) of the measuring element is considerably reduced which contributes to a substantial increase in the life span. A further advantage is that the protective pipe prevents erroneous controls in nonrepresentative measuring gas peaks due to the aforementioned characteristics and enables that the response time is the same for a high oxygen component reducing to a low oxygen content or vice versa, which simplifies the electronic gating circuit. In case that the measuring element is provided with a resistor heating element an energy saving is obtained because of this protective pipe.
BRIEF DESCRIPTION OF THE DRAWING
One exemplified embodiment of the invention is illustrated in the drawing and is explained in more detail in the following description. The drawing illustrates an enlarged side view of a measuring sensor, whereby the end segment of the measuring sensor is illustrated as a longitudinal section.
DESCRIPTION OF THE EXEMPLIFIED EMBODIMENT
The measuring sensor 10 illustrated in the drawing for determining the oxygen content in gases is in particular used in exhaust gases of internal combustion engines. The principle structure of such a measuring sensor 10 is already known from the German Patent No. 81 01 584. This measuring sensor 10 operates in accordance with the known principle of the oxygen concentration chain with ion conductive solid electrolytes; preferably stabilized cubic zirconium dioxide is used. In the present example the solid electrolyte is structured as a solid electrolyte pipe 11 which is provided with a bottom 12. We have not shown the layer like electrodes on the outer side and on the inner side of this solid electrolyte pipe 11 and also have not shown the protective layer of this electrode which is exposed to the measuring gases. These electrodes are preferably mounted on the solid electrolyte pipe 11 as porous layers and are connected with electrical connecting parts in a known manner, of which at least one electrically feeds into the connecting side cable 13; commonly the electrode which is disposed on the outer side of the solid electrolyte pipe 11 and which has a catalyzing effect is connected with the metal housing 14 which is applied to ground. A rod like resistor heating element 16 extends into the inner chamber 15 of the solid electrolyte pipe 11 essentially filling the inner chamber 15 and extending in close proximity of bottom 12 to the solid electrolyte pipe 11. In many applications of this measuring sensor 10, one does not require the arrangement of a resistor heating element 16. The inner chamber 15 of the solid electrolyte pipe 11 is exposed to a reference gas (for example air) which is in contact with the mentioned counter electrode, not illustrated. The remainder structure of this measuring sensor 10 corresponds substantially to the structure of the measuring
REFERENCES:
patent: 3835012 (1974-09-01), Hemak
patent: 3891529 (1975-06-01), Beesch
patent: 3960692 (1976-06-01), Weyl et al.
patent: 4442420 (1984-04-01), Novak
Raff Lothar
Weyl Helmut
Wiedenmann Hans-Martin
Lacey David L.
Robert & Bosch GmbH
Striker Michael J.
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