Drãgerwerk Ag & Co, Kgaa

Dräger Medical Ag & Co Kgaa

Drager Medical Gmbh

Alfred Kelm

Hartmut Stark

Peter Dreyer

Günter Steinert

Ralf Döring

Burkhard Stock

Livio Fornasiero

Ralf Buchtal

Hans-Ulrich Hansmann

Tobias Heise

Christian Jäger

Anja Künzel, Legal Representative

Hans Hansmann

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 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

Growing community of inventors

Bad Endorf, Germany

Alfred Kelm