Dräger Safety Ag&co. Kgaa

Dragerwerk Aktiengesellschaft

Dr&auml;ger Safety Ag & Co. Kgaa

Christoph Bernstein

Rigobert Chrzan

Andreas Nauber

Michael Sick

Stephan Haupt

Dieter Krüger

Marie-Isabell Mattern-Fruhwald

Wilfried Diekmann

Peter Tschuncky

Marie-Isabell Mattern-Frühwald

Johannes Lagois

Gero Sagasser

Hans-Jürgen Busack

Susanne Kassa

Michael Dietrich

Kathrin Hermann

Petra Glas

Dieter Krueger

An electrochemical gas sensor () includes a housing () and with at least one electrode (). The housing () has a gas inlet (). An at least strongly acidic, liquid electrolyte () is present in the gas sensor (). The electrolyte () partly wets the electrode (). Provisions are made in such a gas sensor () for the electrolyte () to contain an additive that contains at least one surfactant. An electrolyte () is also provided for a gas sensor (), which electrolyte () contains at least one surfactant as an additive.

Electrochemical gas sensor and electrolyte for an electrochemical gas sensor

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.

Electrochemical gas sensor

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

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

An electrochemical measuring cell for the simultaneous detection of different gas components in a gas sample, with a plurality of measuring electrodes (4, 5, 6) behind a diffusion barrier (7), with a common reference electrode (8) and counterelectrode (9) in an acid electrolyte, and with a potentiostatic evaluating circuit. Improvements in terms of service life for a sensor for the simultaneous detection of oxygen and carbon monoxide is provided with a reference electrode formed of a sintered mixture of metal and its metal oxide, preferably from the platinum group, the iridium group or gold and the potential of the CO-measuring electrode (5) relative to the reference electrode (8) is set at about 0 to 300 mV, and that of the O.sub.2 -measuring electrode (4) is set at a value between -300 and -800 mV.

Electrochemical multigas sensor

The invention is directed to an electrochemical measuring cell 1 for detecting different gas components. The electrochemical measuring cell includes several measuring electrodes (8, 12, 13), a common counter electrode 21 and a common reference electrode 20 in an aqueous electrolyte 3. The measuring electrodes each include a diffusion membrane (7, 11) and individual diaphragms (9, 14) limiting the inflow of gas to the individual measuring electrodes (8, 12). The diffusion membranes (7, 11) cover the measuring electrodes (8, 12, 13). The measuring cell 1 is so improved that the selectivity of the detection of different gas components is improved. An electrolyte barrier 19 is provided at least between one of the measuring electrodes 8 and the remaining measuring electrodes (12, 13). The electrolyte barrier 19 prevents lateral diffusion within the diffusion membrane (7, 11).

Electrochemical measuring cell

Growing community of inventors

Lübeck, Germany

Christoph Bernstein