Abstract: A gas sensor has at least a measuring electrode and a counter electrode on an electrolyte layer. This gas sensor is improved with respect to the complete extent of the electrochemical reaction achieved of the gas molecules, which are to be detected, at the measuring electrode by the manner of determining an electrical charge developed or accumulated thereat. To solve this task, the invention provides that the measuring electrode (14) has component electrodes (14a, 14b) which enclose the electrolyte layer (11, 12) in the manner of a sandwich.

Abstract: A cover plates device for closing installation ducts in the interior fitting of spaces, including cover plates located one behind the other and are provided with ventilation and electrical components. An axial length compensation between two adjacent cover plates is provided in a simple manner. A first front side of a first cover plate has--in the area of a surface facing the installation duct--a shoulder-like recess of the height H, which extends approximately rectangularly into the first cover plate 1. A second front side of a second cover plate, which is directed toward the first front side of the first cover plate, is designed corresponding to the height H of the recess such that it can be introduced into the recess in such a manner that length tolerances between the cover plates 1, 2, 3 are compensated.

Abstract: The invention directed to an incubator for infants and includes an air guidance system which extends about the support surface 7 and effects a uniform temperature distribution. This uniform temperature distribution is achieved in that the heated air is moved via a fan 8 so that it rises between the incubator hood 2 and the inner wall 4 and thereafter descends between the inner wall 4 and the support surface 7.

Abstract: A breathing valve with a valve disk lying on a valve crater and with a valve spring, which is in contact with the valve disk. A first spring end is provided in contact with a support surface and a second spring end is provided. The valve disk is accommodated in a guide displaceable along an axial valve axis, and the valve spring is fastened such that the line of action of the spring is directed at an angle in relation to the valve axis. The valve is extensively prevented from vibrating.

Abstract: A device for evaporating liquids to generate fog has an electrically heated heat exchanger. A device and a process are provided, which make possible the rapid heating of the liquids to be evaporated to a predetermined temperature range. This is achieved by the wall of the heat exchanger being made of an electrically conducting material and being connected to an electric power source for direct heating.

Abstract: The present invention pertains to an electronic measuring cell for detecting components in fluid media. Such a measuring cell is to be improved such that hermetic sealing of the contact wires leading out of the measuring cell is possible in a housing of a slightly modified design to prevent electrolyte from escaping. To achieve this, an annular space extending in parallel to the circumferential direction of the housing between the measuring cell cover and the housing is filled with an electrolyte- and temperature-resistant sealing material, and the contact wires are led through.

Abstract: A respirator is provided with a gas-metering device for respiration gases, a control unit influencing and monitoring the metering of the gas, an input unit connected to the control unit for introducing commands into the control unit, a display unit outputting parameters, a rotary knob changing preselected parameters, and with an acknowledge switch, which takes over the changed parameter as a new set value into the control unit and is actuated by the rotary knob. The display unit is designed as an interactive flat screen with a contact-sensitive surface. Data entry sectors with setting segments and output sectors for parameters to be displayed are provided within the flat screen. The input unit is designed as a keypad arranged on the side of the flat screen. At least preselected data entry sectors on the flat screen can be switched by means of the keypad.

Abstract: A device for measuring the flow of a fluid in a fluid channel, with at least one thermocouple, whose thermojunctions are arranged one behind the other in the direction of flow of the fluid and are maintained at a working temperature higher than the fluid temperature by means of an ac power source 9. The thermocouple is connected to a measuring circuit evaluating the thermocouple voltage U.sub.T. Continuous measurement with high accuracy is possible with a measuring circuit having a switching network, by which the ac power source is connected to the thermocouple at least during the measurement phase, and by which the ac voltage components superimposed to the thermocouple voltage are eliminated by subtraction.

Abstract: A device for mixing anesthetic vapor with a gas according to the bypass principle such that anesthetic gas or liquid anesthetic is prevented from escaping from the evaporator chamber during transportation. The switching on of the anesthetic evaporator takes place under defined pressure conditions in the evaporator chamber. A transport position, which precedes the switch-off position, and in which a ventilating valve of a ventilating line arriving from the evaporator chamber is switched into the switch-off position by the setting member, is provided on the setting member.

Abstract: A breathing mask with a mask body designed as a full mask with a field of vision and with a filter with a filter connection 13, wherein the filter can be arranged in the middle 3 of the mask body or to the side of it in the cheek area, is to be improved such that the use properties with the filter attached are improved in terms of the position of the center of gravity, a larger field of vision is present, and there is good adaptability to optical devices. To accomplish this task, the filter is designed as a cassette filter extending in the shape of a U from the middle of the mask body to the cheek area, and the field of vision includes a transparent, elastic elastomer section, into which individual, segment-like eye-protective lenses made of a solid material are inserted.

Abstract: A device for the selective detection of a component from a gas mixture comprises a selective prefilter for retaining the other components of the gas mixture, a measuring unit arranged downstream of the selective prefilter for the component to be detected, and a pump pumping the gas mixture. The use of a photoionization detector as a downstream measuring unit makes possible a continuous display operation.

Abstract: The invention is directed to a method for determining characteristic variables of an electrochemically convertible substance in a gas sample. The component of the substance in the gas sample is determined by integrating the total area I enclosed between a physical measurement variable i(t) and a reference line 1. The method is improved in that the concentration portion of the substance can be determined with a high long-term stability and an identification of the substance is possible. The method is carried out by determining the characteristic variables from an individual or several component integrals (I.sub.1, I.sub.2, I.sub.3) as component areas of the total area I and/or of the sum of the component integrals and/or of the ratio of the component integrals I.sub.1 /I.sub.2 and/or of the ratio of the maximum value i.sub.max and the component integral I.sub.2.

Abstract: The invention is directed to a method for detecting error sources in an amperometric measuring cell 1 which includes at least a measuring electrode 2 and a counter electrode 3 within an electrolyte chamber 4 filled with an electrolyte solution 6. A permeable membrane 7 closes off the electrolyte chamber 4 with respect to the measuring sample. The method includes the steps of: providing a voltage source 10 outputting a voltage U to apply across the electrodes to generate a sensor current i(t) between the electrodes; starting with the voltage U across the electrodes at a reference voltage U.sub.0 with a reference current i.sub.0, increasing or decreasing the voltage U to a first voltage U.sub.1 during a first time span T.sub.1 ; shortly after the voltage U assumes the first voltage U.sub.1, measuring a first sensor current i.sub.1 and/or, toward the end of the first time span T.sub.1, measuring a second sensor current i.sub.2 ; and, comparing the sensor currents i.sub.1 and/or i.sub.

Abstract: The present invention pertains to a process for determining an analyte, especially a low-molecular-weight pollutant in a sample. It is carried out by partially dipping into the sample a test strip, on which antibodies which are specific for the analyte and to which in turn a tracer is bound, are immobilized. During the capillary migration of the sample through the test strip, the analyte partially displaces the tracer. The tracer that has remained on the antibody is subsequently visualized by, e.g., dyeing. The intensity of the dyeing is an indicator of the amount of analyte detected.

Abstract: The invention is directed to an electrochemical measuring cell for detecting gaseous constituents in air. The measuring cell includes a measuring electrode and a counter electrode accommodated in a housing. The housing includes an electrolyte chamber and the electrolyte is in liquid contact with the electrodes. The measuring electrode is in diffusion contact with the gas constituents to be detected via a gas-permeable membrane which is impermeable to the electrolyte. The measuring cell is improved so that an effective pressure equalization between the electrolyte chamber and the ambient is made possible in the context of a simple assembly of the housing. For this purpose, the housing jacket surrounding the electrolyte chamber has at least one breakthrough. The electrolyte chamber is separated from the ambient by a gas-permeable stop disposed in the breakthrough. This stop is impermeable to the electrolyte.

Abstract: A device with an extraction fan for use for drawing off ambient air loaded with harmful substances during, e.g., laser surgery or HF surgery, is passed through a filter device. For routine use, easy replacement of the filter should be possible, its loading time is prolonged, and the arrangement of the filter does not compromise the easy handling of the suction line. To achieve this, a transparent sleeve 6, into which a cylindrical folded filter 10 is pulled via a perforation support tube 26, is installed in the suction line, or the filter has a hole 29 provided with a support lining, so that the filter can be directly attached to the suction-side connecting branch 5. The filter 10 is flown through radially, and thus it offers a large filter surface at minimum extension.

Abstract: The invention is directed to an anesthesia arrangement having a pump device for returning preselected gaseous components from an expiration line 2 of the anesthesia apparatus 1 into a first pressure vessel 17. The anesthesia arrangement is so improved that the rinsing losses are minimized and the anesthetic agent is available at constant concentration. The arrangement includes a second pressure vessel 19 connected downstream of the first pressure vessel 17 and a compressor 18 for pumping the gaseous components from the first pressure vessel into the second pressure vessel. The compressor 18 and a cooling unit 20 adjust the operating parameters of pressure and temperature so that at least the anesthetic agent is present in the liquid phase in the second pressure vessel.

Abstract: An amperometric sensor detects acidic and alkaline gases utilizing a first pH-dependent reversible redox system on a measuring electrode 4. A reduction current occurs between the measuring electrode 4 and a counter electrode 6 for a constant potential and is used as a measurement variable of the concentration of the gas to be detected. In addition, a reference electrode 5 is disposed in an electrolyte 7 together with the measuring electrode 4 and the counter electrode 6. The gas to be detected penetrates through the permeable membrane 2 and is dissolved while being dissociated. The amperometric sensor is improved with respect to its permanent stability. This is provided in that the first pH-dependent redox system is coupled to a second redox system and the redox potential of the second redox system is so selected that the reaction product is chemically regenerated again to the educt via the second redox system. The reaction product is electrochemically formed at constant potential by the first redox system.

Abstract: The invention is directed to a detecting device for detecting gaseous substances and aerosols with the aid of an enzymatic reaction. This reaction takes place between a reactant and an enzyme which, on the one hand, is exposed to the substance to be detected and, on the other hand, is held by a carrier which in the form of a porous holder is in contact with a solution activating and maintaining the enzymatic reaction. The properties of the solution are changed by the enzymatic reaction and are evaluated. The detection device is so improved that a capability for evaluation is made possible which is quantitative and which is specific for a particular substance to be detected. The substance to be detected as a reactant can be stoichiometrically transferrable into a reaction product for quantitatively determining the substance to be detected by means of an enzymatic reaction.

Abstract: An apparatus for determining the paramagnetic characteristics of substances such as oxygen includes a cuvette rotating in a magnetic field. The cuvette includes measuring chambers and reference chambers and an alternating voltage is induced in the measuring field coils by the rotation of the cuvette along the magnetic field. A base signal disturbing the measuring signal is also generated. This base signal is caused primarily by changes in the thickness of the material in the reference chambers and the measuring chambers and/or by material thickness changes of the cuvette. To eliminate this base signal, the cuvette includes a magnetic compensating device. This device is mounted at such a position that it generates a compensating magnetic field during its rotation through the magnetic field. This compensating field generates a compensating voltage which has the same amplitude as the base signal but has a signal waveform which is opposite in phase to the base signal.