Abstract: The invention concerns a chemiluminescent gas analyzer (1) for determining a concentration of a gaseous component (G1) in a sample gas mixture (2). The analyzer comprises a measuring chamber (3) having a reflective inner surface (27) and a transparent window (22). A substantial height portion of the reflective inner surface is composed of at least one convergent surface section tapering towards a bottom (35) of said chamber. The input conduits (23, 24) have at least one orifice within a bottom end region (45) of said chamber, said bottom end region being within the height portion for said convergent surface section(s). Further, there is an outlet (18) for removing said gases and possible chemical compounds from the chamber. The pressure (P) within the measuring chamber is at least 0.2 bar. A radiation sensitive detector (7) is directed to said window and said chamber for receiving radiation (E) emitted as a consequence of a reaction between the gaseous component and the gaseous reagent.

Abstract: Measuring transducer and system for the measurement of gas flow, especially for the measurement of the pressure and/or flow of a patient's respiratory gas. The surface of the flow channel (1) wall (2) and/or a restricting element (3) in the flow channel which is directly exposed to the gas flow to be measured is provided with a material retaining water inside it.

Abstract: The invention relates to a procedure for determining the relative concentration or composition of different kinds of haemoglobin, such as oxyhaemoglobin, deoxyhaemoglobin and dyshaemoglobins, and/or dye components contained in blood in a non-invasive manner using the light absorption caused by different haemoglobin varieties and/or dye components, in which procedure light signals are transmitted at at least two predetermined wavelengths to a tissue comprised in the patient's blood circulation, the light signal transmitted through the target under measurement and/or reflected from it is received and the proportion of the intensity of the pulsating light signal received at each wavelength is determined in relation to the total intensity of the light transmitted through the tissue or reflected from the tissue.

Abstract: Measuring detector and system for the measurement of gas flow, especially for the measurement of the pressure and/or flow of a patient's respiratory gas. The surface of the wall (2) of a flow channel (1) and/or the surface of a restricting element (3), said surface being in direct contact with the gas flow to be measured, is provided with an agent for reducing the contact angle (.theta.) of a water drop or a drop containing water to said surface in relation to the contact angle formed between a corresponding water drop and a corresponding surface not treated with such agent.

Abstract: The invention relates to an infrared radiation source for a gas analyzer and a method for generating infrared radiation. The infrared radiation source comprises a body (6), thermal insulation material (5) adapted inside the body (6), a radiant element (1) fitted inside the insulation material (5), elements (2, 3) for feeding electric energy to said radiant element (1), and a channel (7) formed in said body (6) and said thermal insulation material (5) in order to pass the radiation generated by said radiant element (1) to the gas under measurement. According to the invention, at least the thermal insulation material (5) adapted in close proximity to the radiant element (1) has a low thermal conductivity and the emissivity of the radiant surface (11) adapted in close proximity to the radiant element (1) is greater than 0.5 at the operating temperature of the source.

Abstract: The object in a non-dispersive gas sensor is to minimize the use of moving parts, as those reduce the service life of a sensor. A preferred solution is such that it includes one infrared source (1), one short sample chamber (2) and one or generally more infrared detectors (9) operating over a certain wavelength band. If the number of detectors is more than one, it is important that the light arriving in all detectors has traveled through the sample chamber (2) as identically as possible.

Abstract: A method for calibrating a gas analyzer (1). A gas analyzer is calibrated by measuring the zero level of the analyzer (1). The level of the analyzer is measured, after a preceding reset, whenever a temperature variation (.DELTA.T) of an infrared sensor (14) included in the analyzer (1) or of a component thermally connected in a highly conductive manner thereto exceeds a predetermined threshold value (A), or the temperature variation rate (D) of the infrared sensor (14) of the analyzer (1) or of a component thermally connected in a highly conductive manner thereto exceeds a predetermined limit valve.

Abstract: The invention relates to a measuring sensor for the spectroscopic analysis of gas mixtures by means of a silent electrical discharge. A measuring sensor (1) includes a chamber (4), provided with a wall (16) made of a dielectric material, flow connections (5, 6) in this wall for carrying therethrough a gas mixture to be analyzed into (G.sub.1) and out of (G.sub.2) the chamber at a pressure (P) equal to that of ambient air, electrodes (2, 3) on the opposite sides of the chamber with a high alternating voltage (U) applied therebetween, and at least one window (8) in this wall, which is transmissive to wavelengths to be measured. In addition, the sensor includes a light detector element (12) for measuring the intensity of a radiation coming through the window. Said high alternating voltage (U) has a frequency which is at least in the order of 10 kHz for generating in a gas mixture (G) a radiation emission based on the non-ionizing excitation of molecules and/or atoms.

Abstract: The invention relates to a method and apparatus for temperature compensation in gas analyzer equipment for transient error caused by temperature change. According to the method, a radiation source (1) is used for transmitting electromagnetic radiation through a gas mixture to be analyzed, the intensity of radiation transmitted through the gas mixture being analyzed is detected by means of a thermal detector (4) comprising a radiation detecting sensor element (16) and a reference sensor element (17) for generating an output signal proportional to the concentration of gas being analyzed, the temperature of said thermal detector (4) is measured either directly or indirectly, the measured detector temperature values are recorded as a function of time, and the output signal of the thermal detector (4) is temperature compensated by a correction term dependent on the temperature rate of change (DT) of the thermal detector. According to the invention, the uncorrected output signal V.sub.