Dräger Safety Ag&co. Kgaa

Dr&auml;ger Safety Ag & Co. Kgaa

Andreas Huth

Andreas Nauber

Robert Kessel

Kathleen Leahy

Gero Sagasser

Matthias Studer

Michael Sick

Rigobert Chrzan

Marie-Isabell Mattern-Frühwald

Frank Mett

Gregor Steiner

Sabrina Sommer

Christoph Bernstein

Andreas Hengstenberg

Stephan Haupt

Dieter Krüger

Marie-Isabell Mattern-Fruhwald

Wilfried Diekmann

Ingo Kaneblei

Peter Tschuncky

Rolf Eckhardt

Hans-Jürgen Busack

Susanne Schaefer

Susanne Kassa

Kathrin Hermann

Marie-Isabell Mattern-frühwald

Beate Ritz

Sabrina Pilz

Julia Danckert

Sandra Bruegmann

Michael Dietrich

Dieter Krueger

Sandra Brügmann

Frederik Podzuweit

A multi-gas sensor includes a defined arrangement of working electrodes and a reference electrode. The reference electrode has two conductively connected single electrodes formed of respective different electrode materials. The working electrode and the single electrodes are preferably each disk-shaped and are arranged in two stacks one on top of another. A process is provided for a quantitative or qualitative determination of two target gases with the multi-gas sensor.

Electrochemical multi-gas sensor

An electrochemical fuel cell measures ethanol in human breath and a process maintains such an electrochemical fuel cell. The electrochemical fuel cell includes a first electrode (), a second electrode () and a third electrode (). The first electrode () is used as a measuring electrode in a regular operating mode of the electrochemical fuel cell and as a measuring electrode or as a reference electrode in a maintenance mode of the electrochemical fuel cell. The second electrode () is used as a counter electrode in the regular operating mode of the electrochemical fuel cell and as a measuring electrode or as a reference electrode in the maintenance mode of the electrochemical fuel cell. The third electrode () is used as a counter electrode in the maintenance mode of the electrochemical fuel cell.

Electrochemical fuel cell, process for maintaining an electrochemical fuel cell and breath alcohol measuring device

A liquid electrolyte, for an electrochemical gas sensor for detecting NHor gas mixtures containing NH, contains at least one solvent, one conductive salt and/or one organic mediator. The conductive salt is an ionic liquid, an inorganic salt, an organic salt or a mixture thereof. The electrolyte preferably is comprised of (I) water, propylene carbonate, ethylene carbonate or a mixture thereof as solvent; (ii) LiCl, KCl, tetrabutylammonium toluenesulphonate or 1-hexyl-3-methylimidazolium tris(pentafluoroethyl)trifluorophosphate as conductive salt; and (iii) tert-butylhydroquinone or anthraquinone-2-sulphonate as organic mediator.

Liquid electrolyte for an electrochemical gas sensor

An electrochemical gas sensor measures gaseous components in an air/gas mixture. A measuring electrode and a counterelectrode, with an electrolyte located therebetween, are arranged in the sensor housing. A diffusion barrier is configured to set a gas flow of the gas intended for the concentration determination to the measuring electrode from a surrounding area. The diffusion barrier is located in the sensor housing. At least one gas-permeable, hydrophobic pressure absorption element covers the diffusion barrier and is provided between the diffusion barrier and the measuring electrode, in the interior of the sensor housing and on an inner surface of the sensor housing. The inner surface has a mean roughness depth Rthat is lower than or equal to 2 &#x3bc;m at least in an area on which the pressure absorption element lies.

Electrochemical gas sensor

An electrochemical gas sensor () has a housing (), a working electrode (), a counterelectrode () and a reference electrode (). The housing () has an electrolyte reservoir (), a gas inlet orifice () and at least one gas outlet orifice (). The electrolyte reservoir () is filled with a liquid electrolyte (). The gas sensor () has a counterelectrode carrier (). The counterelectrode () is suspended on the counterelectrode carrier () in such a way that the counterelectrode () is suspended in the electrolyte reservoir () and the electrolyte () flows around the counterelectrode () on all sides. Preferably, the electrolyte includes (I) a solvent, e.g. water, propylene carbonate, ethylene carbonate or mixtures thereof; (ii) a conductive salt, especially an ionic liquid; and/or (iii) an organic mediator, for example substituted quinones, anthraquinones, etc.

Electrochemical gas sensor, liquid electrolyte and use of a liquid electrolyte in an electrochemical gas sensor

A gas sensor () in a sensor housing () has a gas-permeable membrane () for the inlet of a gas sample to be analyzed to a measuring electrode (). The gas sensor () is provided with a test gas generator (), which has a generator housing (). The generator housing () is fastened in the area of the gas-permeable membrane () and has a central gas outlet opening () for the gas sample to pass into the sensor and has outlet openings () directed towards the gas-permeable membrane () for the test gas.

Gas sensor with test gas generator

A safety helmet provides toxic gas monitoring in the field of vision of the helmet user. The safety helmet includes a gas-measuring device of modular design. The safety helmet has a sensor module () positioned in the field of vision of the helmet user.

Safety helmet with gas-measuring device

An electrochemical gas sensor with a stacked arrangement of electrodes and nonwoven layers arranged in parallel, comprising at least one measuring electrode () and at least one counterelectrode (). A porous membrane () that is permeable to air is in contact with the stacked arrangement of electrodes and nonwoven layers arranged in parallel at least on one side, at least one layer of a hydrophilic nonwoven () is located between the electrodes. The porous membrane () that is permeable to air and the hydrophilic nonwoven () extend into a separate equalization volume (), which is filled with electrolyte at least partially and is located at least partially in one plane with the electrodes. The separate equalization volume () surrounds the electrode arrangement at least partially in this plane, and the porous membrane () that is permeable to air is exposed to ambient pressure at least in partial areas. Such sensors are characterized by a flat shape, high insensitivity to shocks, independence from the position, and high tolerance to variations in environmental humidity.

A gas sensor () with a detector element (), which is specific to a gas to be measured and sends a measured signal that depends on the measured gas concentration, has increased measuring sensitivity for measurements in the concentration range from less than 1 ppb to a few ppb. The detector element () is exposed in a gas admission adapter () to a gas to be measured via a diaphragm () arranged in front of the detector element (), wherein the gas admission adapter () has at least a first opening () for the entry of the gas to be measured as well as at least a second opening (), which is connected with a pressure modulator, which generates periodic gas pressure vibrations in the gas admission adapter () and is designed, for example, as a pump ().

Gas sensor with increased measuring sensitivity

A gas-measuring device has an electrochemical sensor and features such that the readiness for use is guaranteed for a determined period of time. A status display (), is activated by the evaluating circuit () of the gas-measuring device. The status display () displays the degree of depletion of the sensor.

Gas-measuring device with an electrochemical sensor

An electrochemical measuring cell for detecting hydrocyanic acid is improved in such a manner that a stable measurement signal is provided after a short time. The measuring cell includes a measuring electrode ( ) of sintered gold and a counter electrode ( ). A measuring cell housing ( ) accommodates the measuring electrode ( ) and the counter electrode ( ). An electrolyte is in the measuring cell housing ( ) and includes sulphuric acid with an additive of silver sulphate. A diffusion membrane ( ) is disposed between the measuring electrode ( ) and the substance to be detected.

Electrochemical measuring cell for detecting hydrocyanic acid

Growing community of inventors

Stockelsdorf, Germany

Andreas Nauber