Drãgerwerk Ag & Co, Kgaa

Dragerwerk Aktiengesellschaft

Dräger Medical Ag & Co Kgaa

Drager Medical Gmbh

Draeger Medical Ag & Co. Kg

Günter Steinert

Peter Dreyer

Hartmut Stark

Alfred Kelm

Ralf Döring

Bernd-Michael Dicks

Ralph-Peter Jacobi

Tobias Heise

Hans-Ullrich Hansmann

Burkhard Stock

Livio Fornasiero

Ralf Buchtal

Hans-Ulrich Hansmann

Robert Jahns

Holger Stegmann

Andrea Haeusler

Andreas Gerk

Peter Drever

Hans Hansmann

Christian Jäger

Anja Künzel, Legal Representative

A measurement system () determines gas concentrations in a gas mixture of a gas sample by utilizing thermal conductivities and paramagnetic effects of thermal conductivities in the gas mixture involving data sets (). A circuit arrangement provides measured values with an AC signal component and with a DC signal component to a calculation and control unit (). An oxygen concentration in the gas mixture of the gas sample is determined based on the standardized AC signal components and a concentration of another gas in the gas mixture of the gas sample is determined based on the standardized DC voltage signal components. Output signals are generated by the calculation and control unit, which indicate the determined oxygen concentration and the determined concentration of another gas in the gas mixture of the gas sample.

Measuring system for determining gas concentrations

A device () for determining the concentration of a gas component is configured with a radiation source () for radiating () light as a light emission in an infrared wavelength range. Two detector arrays () with two detector elements () are configured suitably for detecting the light emission generated by the radiation source () in two detector arrays (). Two filter elements () are associated with the detector elements (). The two detector elements () are oriented in relation to the radiation source, so that a range of overlap () is obtained due to the two detector arrays (). The range of overlap () causes attenuations in the propagation of light, which may be due to gas molecules or moisture (). The attenuations in the propagation of light affect both detector elements () and are compensated concerning the determination of the concentration.

Device for determining the concentration of at least one gas component in a breathing gas mixture

A device () for determining the concentration of a gas component is configured with a radiation source () for emitting () a light radiation or heat radiation in an infrared wavelength range. A detector array () has at least two detector elements (), configured to detect the radiation generated by the radiation source (), in an angular arrangement () and with filter elements (). At least one of the two detector elements () is oriented in an angular arrangement () in relation to a vertical axis (), so that a range of overlap () is obtained due to the angular arrangements (). The range of overlap () causes attenuations in the propagation of light, which attenuations may be due, for example, to gas molecules or moisture (), affect both detector elements () and are thus compensated concerning the concentration determination.

A measurement head is provided for a device for measuring the concentration of at least one gas, in particular oxygen. A gas sample a measurement element () is arranged in the region of an opening on a circuit board (). To convey gas a duct () is formed in each of two metal bodies, which surround the measurement element () and serve as magnetic poles. During operation of the measurement head the gas sample flows substantially perpendicularly, first through one of the metal bodies (), and then through the opening () on a side of the measurement element () facing the opening and emerges again through the other metal body ().

Measuring head for a device for measuring the concentration of at least one gas in a gas sample

A device for measuring the concentrations of paramagnetic gases in a gas sample has at least one modulatable magnetic flux source, which has an air gap, to which a gas sample can be fed. A controllable power source, for generating current and voltage signals, is coupled with the modulatable magnetic flux source in order to generate a modulatable magnetic flux within the air gap. Two measuring points are arranged at least partly within the air gap. Each measuring point has an electrically controllable heating device and a heat conduction-measuring unit or resistive measuring device. Each measuring point is coupled with a variable power source to heat the heating device to a working temperature. Each measuring point is coupled with a measuring circuit to measure heat conduction measured signals generated by the heat conduction-measuring unit, from which the concentrations of paramagnetic gases, which are contained in the gas sample, can be derived.

Device for measuring the concentration of paramagnetic gases

A gas concentration-measuring device makes it possible to measure gas components in a gas sample. An interferometer, based on a dual-band Fabry-Perot interferometer (), is provided with a transmission spectrum that can be set by a control voltage (). The control voltage () of the dual-band Fabry-Perot interferometer () is synchronized over the course of time with the activation and deactivation of the radiation sources ().

Gas concentration-measuring device

A gas concentration measuring apparatus is in miniaturized form and permits the measurement of anesthetic gas components. A variable interferometer is provided on the basis of a Fabry Perot interferometer () wherein the mirrors () can be changed in spacing with respect to each other. The mirrors () have coatings which make possible the transmission in two spectral ranges (&#x394;&#x3bb;, &#x394;&#x3bb;).

Gas concentration measuring apparatus

A measuring head for the determination of the concentration of a paramagnetic gas in a gas sample has first and second housing parts () made of a steel alloy for accommodating a magnet coil body () each. The magnet coil bodies extend concentrically around the central axis of each housing part (). Metallic bars (), which are used as magnet poles for the measuring head, are located at spaced locations with a defined air gap in the assembled state of the measuring head. The bars are arranged in the center of the measuring head in the area of the central axis of the housing parts (). A sample gas cuvette support () is provided in the air gap between the housing parts () for positioning a sample gas cuvette holder (). The sample gas cuvette support () is provided with a gas inlet and gas outlet ().

Measuring head for a device for measuring the concentration of a paramagnetic gas

A highly compact measuring gas cell for a device for measuring the concentration of a paramagnetic gas on the basis of the change in the thermal conductivity of the paramagnetic gas, which is brought about by a change in the magnetic field. The measuring gas cell has a bottom plate () that carries a measuring element () for the detection of the thermal conductivity of the measured gas, electric leads, an electric measuring gas cell heater () and a temperature-dependent electric sensor element () for the detection of the temperature of the measuring gas cell. A channel plate () is cut out for the gas guide in the area of the measuring element () and around the measuring element (). A cover plate (), seals the measuring gas cell in the upward direction and has at least two holes for the inlet and outlet of the gas into and out of the gas guide of the channel plate ().

Measuring gas cell for a device for measuring the concentration of a paramagnetic gas

A laser array for determining the concentrations of gases. A simply acting device and a corresponding process are provided, which make possible a high signal resolution by reducing the interferences without prolonging the measurement time. The interferences occurring in the laser array are reduced by the laser source being set to perform longitudinal oscillations in the direction of the optical axis. These oscillations preferably have a sinus or sawtooth shape, and a frequency in the range of 10 to 1,000 Hz that does not otherwise occur in the laser array and an oscillation amplitude corresponding to one fourth to a multiple of the wavelength of the radiation of the laser source.

Radiation source for laser spectroscopy

A pressure regulator or pressure element with a valve, whose valve closing body 10 separates an admission pressure chamber 2 from a back pressure chamber 3, has a diaphragm 12 that is under spring pressure in the opening direction of the valve closing body 10. The diaphragm 12 separates the back pressure chamber from a reference pressure chamber 4 which is filled with a gas that is under such pressure that its ability to expand compensates the temperature dependence of the compressive force of the spring in order to compensate the pressing force of the compression spring 13, which changes with changing temperature.

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Bad Oldesloe, Germany

Günter Steinert